Documentation on how data is stored internally and how indexes work (in the performance section).
Build-in documentation search: improved results if searching for multiple words.
@changelog_1003_li
Some people reported NullPointerException in FileObjectDiskMapped. The most likely explanation is that multiple threads access the same object at the same time. Therefore, the public methods in this class are now synchronized.
DatabaseMetaData.getColumns: there is a typo in the JDBC specification, so that the column #19 is named SCOPE_CATLOG instead of SCOPE_CATALOG. For compatibility with the specification, this column is now also named SCOPE_CATLOG in H2. A new column named SCOPE_CATALOG is appended as column #24. Please note that MySQL only supports SCOPE_CATALOG, while other databases only support SCOPE_CATLOG.
@changelog_1004_li
Improved error detection when starting a server with invalid arguments, such as "-tcpPort=9091" or "-tcpPort 9091" (as one parameter) instead of "-tcpPort", "9091".
Build: jar files are now downloaded using Maven if possible (and cached in the local Maven repository). Unfortunately, in many cases this will download more data from the Maven repository.
@changelog_1005_li
The function STRINGDECODE ignored characters after a non-escaped double quote. This is no longer the case.
JaQu has been improved a lot thanks to the new committer James Moger.
@changelog_1006_li
The new CSV option feature introduced in version 1.3.150 didn't support spaces. Now the escape mechanism is changed to support it.
New sample application that shows how to use "instead of" triggers to support updatable views.
@changelog_1007_li
The pseudo-column "_ROWID_" now supports insert, update, and merge (only enabled for version 1.3.x).
H2 Console: opening a MS SQL Server database is now faster. Also, listing the database meta data sometimes resulted in an exception.
@changelog_1008_li
Linked tables / MS SQL Server: if the tables were created in mixed case in MS SQL Server, then the identifiers in the linked tables were case sensitive (in H2).
@changelog_1009_li
MVCC: the probability of a lock timeout is now lower if multiple threads try to update the same rows.
@changelog_1010_li
Building only the documentation (without compiling all classes) didn't work, specially: ./build.sh clean javadocImpl.
@changelog_1011_li
Documentation on how data is stored internally and how indexes work (in the performance section).
@changelog_1012_li
Some people reported NullPointerException in FileObjectDiskMapped. The most likely explanation is that multiple threads access the same object at the same time. Therefore, the public methods in this class are now synchronized.
@changelog_1013_li
Improved error detection when starting a server with invalid arguments, such as "-tcpPort=9091" or "-tcpPort 9091" (as one parameter) instead of "-tcpPort", "9091".
@changelog_1014_li
The function STRINGDECODE ignored characters after a non-escaped double quote. This is no longer the case.
@changelog_1015_li
The new CSV option feature introduced in version 1.3.150 didn't support spaces. Now the escape mechanism is changed to support it.
@changelog_1016_li
The pseudo-column "_ROWID_" now supports insert, update, and merge (only enabled for version 1.3.x).
@changelog_1017_li
Deleting rows in the trigger table inside a trigger could result in a NullPointerException.
@changelog_1009_h2
@changelog_1018_h2
Version 1.3.151 Beta (2011-02-12)
@changelog_1010_li
@changelog_1019_li
Server: it was possible to open a database outside of the base URL (if one was set). The test case was broken.
@changelog_1011_li
@changelog_1020_li
The H2 Console tool now supports a database URL as a command line option.
@changelog_1012_li
@changelog_1021_li
Clob.getSubString and Blob.getBytes are now up to 3 times faster.
@changelog_1013_li
@changelog_1022_li
New database setting DEFAULT_CONNECTION (disabled by default) to support DriverManager.getConnection("jdbc:default:connection"). Please note the Oracle JDBC driver will try to resolve this database URL if it is loaded before the H2 driver.
@changelog_1014_li
@changelog_1023_li
JaQu: the static map Db.TOKENS was not synchronized.
@changelog_1015_li
@changelog_1024_li
DatabaseMetaData.getProcedureColumns returned the wrong data (it also returned the Connection parameter if there was any).
@changelog_1016_li
@changelog_1025_li
Issue 284: If the query cache was used (enabled by default in version 1.3.x), and multiple threads used the same connection, and the same query but different prepared statements, parameters of one prepared statement could be overwritten by another.
@changelog_1017_li
@changelog_1026_li
If the query cache was used (enabled by default in version 1.3.x), parameters of re-used queries were not reset in prepared statements.
@changelog_1018_li
@changelog_1027_li
CallableStatement: the first row of the result set was skipped when using CallableStatement.execute().
@changelog_1019_li
@changelog_1028_li
Batch update exceptions now include the root cause and all chained exceptions (getNextException).
@changelog_1020_li
@changelog_1029_li
Reading a large result set with a BLOB or CLOB column could throw a NullPointerException.
@changelog_1021_li
@changelog_1030_li
Support for the MS SQL Server syntax VARCHAR(MAX).
@changelog_1022_li
@changelog_1031_li
The Recover tool could print "/ by zero" on an empty database.
@changelog_1023_li
@changelog_1032_li
For tables without a single column primary key of type INT or LONG, the unique row id had gaps, which didn't look nice.
@changelog_1024_li
@changelog_1033_li
Each table now has a pseudo-column "_ROWID_" to get the unique row id (only enabled for version 1.3.x).
@changelog_1025_li
@changelog_1034_li
User defined functions can now have parameters of any class. Values of type OTHER (or OBJECT or JAVA_OBJECT) are automatically de-serialized in that case.
@changelog_1026_li
@changelog_1035_li
Linked tables: for NUMERIC column, Oracle reports precision 0 and scale -127. A workaround has been implemented (the same as for DECIMAL columns in version 1.3.150).
@changelog_1027_li
@changelog_1036_li
Issue 279: Auto-Server mode: unclear error message when trying to connect using AUTO_SERVER if the database is already open without the flag (Connection is broken: "null").
@changelog_1028_li
@changelog_1037_li
Issue 238: Can drop a column that has a single-column constraint.
@changelog_1029_h2
@changelog_1038_h2
Version 1.3.150 Beta (2011-01-28)
@changelog_1030_li
@changelog_1039_li
CSVREAD / CSVWRITE: instead of setting the options one by one, all options can be combined into a space separated key-value pairs.
@changelog_1031_li
@changelog_1040_li
CSVREAD / CSV tool: there is a new option "lineCommentCharacter" to set or disable line comments. For H2 version 1.2, the default is '#' (as before). For H2 version 1.3, line comments are disabled by default.
@changelog_1032_li
@changelog_1041_li
Issue 277: JaQu didn't correctly convert a CLOB column to a String.
@changelog_1033_li
@changelog_1042_li
./build.sh testNetwork could block if there was a network configuration problem.
@changelog_1034_li
@changelog_1043_li
Reading input streams from the classpath is now supported. Example: RUNSCRIPT FROM 'classpath:org/h2/samples/newsfeed.sql'.
@changelog_1035_li
@changelog_1044_li
PreparedStatement.toString() now includes the parameter values in a human readable format.
@changelog_1036_li
@changelog_1045_li
New database setting OPTIMIZE_IN_SELECT (enabled by default for version 1.3.x). If enabled, IN(SELECT...) conditions are faster if there are many rows in the table or subquery.
@changelog_1037_li
@changelog_1046_li
Linked tables: for DECIMAL column, Oracle reports precision 0 and scale -127. A workaround has been implemented.
@changelog_1038_li
@changelog_1047_li
TCP Server: a base directory with a prefix with a database name with prefix didn't work as expected (this only applies to non-disk and wrapped file systems).
@changelog_1039_li
@changelog_1048_li
Version 1.3: when re-running the same query so that the previous result was re-used, and if the result set was large so that it was stored externally (in a temp file or in a temp table), then reading rows from both result sets resulted in an exception or wrong behavior.
@changelog_1040_li
@changelog_1049_li
A new sample application that shows how to create a read-only database in a zip file where the database file is split into multiple smaller parts.
@changelog_1041_li
@changelog_1050_li
The Backup tool now supports compressing all files in a given directory.
@changelog_1042_li
@changelog_1051_li
H2 Console: the special syntax @list and @meta can not be combined.
@changelog_1043_li
@changelog_1052_li
The wrong error message was thrown when trying to open a database where the database file could not be read for some reason (for example because the split file system was used, and the file was split at the wrong position).
@changelog_1044_li
@changelog_1053_li
There was a memory leak in the trace system. Opening and closing many connections could run out of memory.
@changelog_1045_li
@changelog_1054_li
The scan-resistant cache type "TQ" (two queue) is again available. To use it, append ;CACHE_TYPE=TQ to the database URL.
@changelog_1046_h2
@changelog_1055_h2
Version 1.3.149 Beta (2011-01-07)
@changelog_1047_li
@changelog_1056_li
Lob in database: after the process was killed while adding a lob, inserting a lob could throw an exception (primary key violation in LOB_MAP).
@changelog_1048_li
@changelog_1057_li
Server tool: the tcpShutdown feature now also stops other servers (web server and PostgreSQL server).
@changelog_1049_li
@changelog_1058_li
Server tool: the tcpShutdown url must now end with the port if the port is used.
@changelog_1050_li
@changelog_1059_li
Server tool: when starting one service fails, the started services are now stopped.
@changelog_1051_li
@changelog_1060_li
Multi-version concurrency: SELECT ... FOR UPDATE threw a "concurrent update" exception immediately instead of a "lock timeout" exception after the set lock timeout if the row was already locked by another connection.
@changelog_1052_li
@changelog_1061_li
Translation: the H2 Console and error messages have been translated to Czech by Hannibal (http://hannibal.cestiny.cz/). Thanks a lot!
@changelog_1053_li
@changelog_1062_li
When the system property h2.lobInDatabase is set, reading a BLOB is a bit faster because the length is not read.
@changelog_1054_li
@changelog_1063_li
The SimpleResultSet now has a feature to not close the result set after reading the last row.
@changelog_1055_li
@changelog_1064_li
Native fulltext search: the ignore list doesn't need to be all uppercase now.
@changelog_1056_li
@changelog_1065_li
Improved statistics output in the Recover tool.
@changelog_1057_li
@changelog_1066_li
Issue 269: GROUP BY queries with a column or having clause that contains IN(SELECT ...) could return the wrong values. Example: SELECT X IN(SELECT Y) FROM Z GROUP BY X.
@changelog_1058_li
@changelog_1067_li
After closing a database, the writer thread will stop almost immediately (instead of after at most 100 ms). This should avoid error messages in the Tomcat log file after a shutdown.
@changelog_1059_li
@changelog_1068_li
Issue 271: ResultSet.getConcurrency() did not correctly detect that the result set is not updatable.
@changelog_1060_li
@changelog_1069_li
The SLF4J 1.6 API is now used by default (this should not have any user visible effect).
@changelog_1061_li
@changelog_1070_li
The org.h2.tools.Console no longer calls System.exit on shutdown (this should not have any user visible effect, but should allow to integrate the tool easier into other applications).
@changelog_1062_li
@changelog_1071_li
Improved date / time arithmetics. Adding and subtracting a floating point value from a date or timestamp is now supported.
@changelog_1063_li
@changelog_1072_li
When creating a BLOB with in InputStream or a CLOB with a Reader, and the InputStream or Reader threw an non-IOException, then the LOB storage was broken when storing LOBs in the database.
@changelog_1064_li
@changelog_1073_li
EXPLAIN SELECT didn't include the sample size if one was set.
@changelog_1065_li
@changelog_1074_li
Improved EXPLAIN plan formatting and documentation.
@changelog_1066_li
@changelog_1075_li
Issue 266: Domains: a NOT NULL clause in a domain definition ignored.
@changelog_1067_li
@changelog_1076_li
More accurate calculation of variance and standard deviation for large number of samples with low variance (now using Welford's method).
@changelog_1068_li
@changelog_1077_li
Server: CLOB data with unicode characters between character code 0xd800 and 0xdfff were not transferred correctly. In many cases, the thread was stuck afterwards.
@changelog_1069_li
@changelog_1078_li
Issue 264: the Hibernate dialect in src/tools was removed because it is outdated.
@changelog_1070_li
@changelog_1079_li
Cache size limit could be exceeded for certain queries, leading to an OutOfMemoryError in some cases. Fixed.
@changelog_1071_h2
@changelog_1080_h2
Version 1.3.148 Beta (2010-12-12)
@changelog_1072_li
@changelog_1081_li
The built-in connection pool was simplified a bit. The dispose() method no longer throws an exception (it only logs it).
@changelog_1073_li
@changelog_1082_li
The database upgrade (to upgrade from H2 version 1.1.x) has been simplified.
@changelog_1074_li
@changelog_1083_li
The feature to log all errors (system properties h2.logAllErrors and h2.logAllErrorsFile) has been removed.
@changelog_1075_li
@changelog_1084_li
When starting the H2 Console, the properties file can now be completely disabled.
@changelog_1076_li
@changelog_1085_li
Server.openBrowser no longer writes to System.out directly if opening the URL failed.
@changelog_1077_li
@changelog_1086_li
The INSERT optimizations (INSERT ... DIRECT SORTED SELECT) were not parsed correctly when using a column list.
@changelog_1078_li
@changelog_1087_li
H2 Console: the tables and columns are now listed for SQLite as well.
@changelog_1079_li
@changelog_1088_li
H2 Console: improved autocomplete feature (also simplified the source code for this feature).
@changelog_1080_li
@changelog_1089_li
Issue 260: the DbStarter servlet context listener now starts the server before opening a connection, so that connecting using the server mode works.
@changelog_1081_li
@changelog_1090_li
The Shell tool can now enable, disable, and display the current autocommit mode.
@changelog_1082_li
@changelog_1091_li
Issue 259: there is a limitation in the cluster mode: The SQL statement SET AUTOCOMMIT FALSE doesn't work. To disable autocommit, the method Connection.setAutoCommit(false) needs to be called. This is now documented.
@changelog_1083_li
@changelog_1092_li
Connection pool / DataSource: a NullPointerException was thrown when using a database URL that doesn't start with "jdbc:h2:".
@changelog_1084_li
@changelog_1093_li
Using the java.sql.Blob or java.sql.Clob interfaces could throw the wrong exception after the object was closed.
@changelog_1085_li
@changelog_1094_li
LOB: in server mode, if the feature "LOBs in database" is disabled, the temporary files are now created in the temp directory (the same as when "LOBs in database" is enabled).
@changelog_1086_h2
@changelog_1095_h2
Version 1.2.147 (2010-11-21)
@changelog_1087_li
@changelog_1096_li
H2 Console: the server properties directory can now be set on the command line using java ... -properties <directory>. Issue 159.
@changelog_1088_li
@changelog_1097_li
New feature INSERT INTO ... DIRECT SELECT, mainly to speed up loading tables from a CSV file. When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step (without temporary file).
@changelog_1089_li
@changelog_1098_li
Converting binary data to UUID was incorrect when the converting more than 31 bytes. Now always the first 16 bytes are used.
@changelog_1090_li
@changelog_1099_li
Improved date / time arithmetics. Now supported are multiplying and dividing a time with / by a number, adding and subtracting a time to / from a time or date, subtracting a time or timestamp from a timestamp.
@changelog_1091_li
@changelog_1100_li
The Ant build script has been removed because it is no longer up to date.
@changelog_1092_li
@changelog_1101_li
Nested outer joins without brackets were not working as expected. Example: select * from a inner join b inner join c on c.id = b.id on b.id = a.id;
@changelog_1093_li
@changelog_1102_li
JMX (the Java management extension) is now supported. Issue 253.
@changelog_1094_li
@changelog_1103_li
Creating a comment on a column didn't work if the schema name was equal the database name.
@changelog_1095_li
@changelog_1104_li
When using multi-version concurrency, re-running a prepared statement with the same parameters would sometimes give the same result even if another connection committed a change (the previous result was sometimes re-used incorrectly).
@changelog_1096_li
@changelog_1105_li
When using SELECT_FOR_UPDATE_MVCC (lock only the selected rows when using MVCC), the selected rows were sometimes not locked correctly.
@changelog_1097_li
@changelog_1106_li
When using Lucene 3, the index files were not always closed when the database was closed.
@changelog_1098_li
@changelog_1107_li
Concurrently preparing a statement and altering a table could throw a table not found exception.
@changelog_1099_li
@changelog_1108_li
When concurrently preparing many statements with a subquery, in some cases the query didn't run (Column "..." must be in the GROUP BY list).
@changelog_1100_li
@changelog_1109_li
CallableStatement: now the syntax "{? = CALL...}" is supported as well.
@changelog_1101_li
@changelog_1110_li
Lob in databases: two small BLOB or CLOB values were always considered equal. This also affected unique indexes.
@changelog_1102_li
@changelog_1111_li
The shutdown hook is (re-) enabled by default even for H2 version 1.3.x.
@changelog_1103_li
@changelog_1112_li
When creating a database from a recovery script, the same user can now be used (CREATE USER now always includes IF EXISTS).
@changelog_1104_li
@changelog_1113_li
The H2 Console now prints a status message if started with parameters.
@changelog_1105_h2
@changelog_1114_h2
Version 1.3.146 Beta (2010-11-08)
@changelog_1106_li
@changelog_1115_li
This is a beta version. The next version will be 1.2.147. The differences between 1.2.x and 1.3.x are:
@changelog_1107_li
@changelog_1116_li
In version 1.3.x, h2.lobInDatabase (store CLOB and BLOB in the database file) is enabled by default.
@changelog_1108_li
@changelog_1117_li
In version 1.3.x, ANALYZE_AUTO is 2000 (automatic ANALYZE).
@changelog_1109_li
@changelog_1118_li
In version 1.3.x, DB_CLOSE_ON_EXIT (the shutdown hook) is disabled by default.
@changelog_1110_li
@changelog_1119_li
In version 1.3.x, DROP_RESTRICT (default action for DROP is RESTRICT) is enabled.
@changelog_1111_li
@changelog_1120_li
In version 1.3.x, FUNCTIONS_IN_SCHEMA (allow to store functions in a schema) is enabled.
@changelog_1112_li
@changelog_1121_li
In version 1.3.x, LARGE_TRANSACTIONS (support for very large transactions) is enabled. Changes to tables without a primary key can be buffered to disk.
@changelog_1113_li
@changelog_1122_li
In version 1.3.x, MAX_MEMORY_ROWS_DISTINCT is set to a 10000.
@changelog_1114_li
@changelog_1123_li
In version 1.3.x, NESTED_JOINS (nested joins and right outer joins) is enabled.
@changelog_1115_li
@changelog_1124_li
In version 1.3.x, OPTIMIZE_INSERT_FROM_SELECT (speed up CREATE TABLE ... AS SELECT) is enabled.
@changelog_1116_li
@changelog_1125_li
In version 1.3.x, OPTIMIZE_OR (convert OR conditions to IN(..) if possible) is enabled.
@changelog_1117_li
@changelog_1126_li
In version 1.3.x, QUERY_CACHE_SIZE is enabled.
@changelog_1118_li
@changelog_1127_li
In version 1.3.x, SELECT_FOR_UPDATE_MVCC (MVCC and SELECT FOR UPDATE) is enabled.
@changelog_1119_li
@changelog_1128_li
In version 1.3.x, RUNSCRIPT and SCRIPT (commands and tools), use UTF-8 by default (ScriptCommand.charset).
@changelog_1120_li
@changelog_1129_li
In version 1.3.x, Lucene 3 is used by default. Issue 147.
@changelog_1121_li
@changelog_1130_li
When the system property h2.lobInDatabase is set, the lob tables were always created when closing the database, even if the tables were not needed.
@changelog_1122_li
@changelog_1131_li
In the MySQL mode, SHOW TABLES didn't work, and meta data tables were not case insensitive. Updatable result sets didn't work as expected. Issue 249.
@changelog_1123_li
@changelog_1132_li
Connection-created Clob and Blob objects can now be filled using Clob.setCharacterStream(1), Clob.setString(1, s), Blob.setBytes(1, x), Blob.setBinaryStream(1). Issue 235.
@changelog_1124_li
@changelog_1133_li
Trying to convert a very small CLOB to a BLOB or a very small CLOB to a BLOB threw a NullPointerException.
@changelog_1125_li
@changelog_1134_li
INFORMATION_SCHEMA.SETTINGS: now the current page count can be queried using select * from information_schema.settings where name = 'info.PAGE_COUNT'.
@changelog_1126_li
@changelog_1135_li
For an invalid value exception, the parameter name and value was switched in some cases.
@changelog_1127_li
@changelog_1136_li
When using trace level 3, opening a database no longer prints there is a EOFException (because that is the expected behavior).
@changelog_1128_li
@changelog_1137_li
CALL calling a Java function with return type ResultSet and return value null threw a ClassCastException.
@changelog_1129_li
@changelog_1138_li
SELECT ... FROM CSVREAD no longer creates a temporary file. Some large imports are now twice as fast.
@changelog_1130_h2
@changelog_1139_h2
Version 1.2.145 (2010-11-02)
@changelog_1131_li
@changelog_1140_li
A new String cache is now created at most once every 5 second, so that out of memory exceptions are not artificially delayed.
@changelog_1132_li
@changelog_1141_li
After closing a database, the writer thread will stop after 100 ms at the latest (instead of 1 second).
@changelog_1133_li
@changelog_1142_li
Opening a large database could fail in theory if the process was killed and then not fully compacted (because the unique transaction log key was re-used).
@changelog_1134_li
@changelog_1143_li
Views now store the schema for Java functions if "functions in schemas" is enabled (system property h2.functionsInSchema).
@changelog_1135_li
@changelog_1144_li
Improved error message if the LOB files are already deleted on the client side.
@changelog_1136_li
@changelog_1145_li
Closing a Statement or PreparedStatement at the same time as executing a statement could throw a strange exception. Issue 241.
@changelog_1137_li
@changelog_1146_li
The Recover tool did not work with compressed lob files (set compress_lob lzf). Also, sometimes the Recover tool was very slow, specially using a 64-bit JVM, because it tried to de-compress lob files even if they were not compressed (which could allocate a lot of memory).
@changelog_1138_li
@changelog_1147_li
H2 Console: webAllowOthers and webSSL were swapped if they didn't exist in the properties file. Issue 244.
@changelog_1139_li
@changelog_1148_li
When the system property h2.lobInDatabase is set, CREATE TABLE ... AS SELECT with a LOB column did not always work.
@changelog_1140_li
@changelog_1149_li
Some system properties are not supported any longer, because they can already be set in the database URL. The constants are: CACHE_SIZE_DEFAULT, CACHE_TYPE_DEFAULT, DEFAULT_LOCK_MODE, LOCK_MODE_READ_COMMITTED, DEFAULT_MAX_LENGTH_INPLACE_LOB, DEFAULT_MAX_LENGTH_INPLACE_LOB2, DEFAULT_MAX_MEMORY_UNDO, DEFAULT_MAX_OPERATION_MEMORY, DEFAULT_PAGE_SIZE, DEFAULT_RESULT_SET_CONCURRENCY, MIN_WRITE_DELAY.
@changelog_1141_li
@changelog_1150_li
Various system properties have been replaced with database level settings: ALIAS_COLUMN_NAME, ANALYZE_AUTO, ANALYZE_SAMPLE, DATABASE_TO_UPPER, DEFAULT_ESCAPE, DEFRAG_ALWAYS, DROP_RESTRICT, ESTIMATED_FUNCTION_TABLE_ROWS, FUNCTIONS_IN_SCHEMA, LARGE_RESULT_BUFFER_SIZE, LARGE_TRANSACTIONS, MAX_COMPACT_COUNT, MAX_COMPACT_TIME, MAX_MEMORY_ROWS_DISTINCT, MAX_QUERY_TIMEOUT, NESTED_JOINS, OPTIMIZE_DISTINCT, OPTIMIZE_EVALUATABLE_SUBQUERIES, OPTIMIZE_INSERT_FROM_SELECT, OPTIMIZE_IN_LIST, OPTIMIZE_IS_NULL, OPTIMIZE_OR, OPTIMIZE_SUBQUERY_CACHE, OPTIMIZE_TWO_EQUALS, OPTIMIZE_UPDATE, PAGE_STORE_INTERNAL_COUNT, PAGE_STORE_TRIM, QUERY_CACHE_SIZE, RECOMPILE_ALWAYS, RECONNECT_CHECK_DELAY, SELECT_FOR_UPDATE_MVCC, SHARE_LINKED_CONNECTIONS. See the Javadoc documentation of DbSettings for details. The system properties are still supported for backward compatibility.
@changelog_1142_li
@changelog_1151_li
When the system property h2.nestedJoins was enabled, some outer joins returned the wrong result.
@changelog_1143_li
@changelog_1152_li
Opening a database could throw a NullPointerException.
@changelog_1144_li
@changelog_1153_li
After a crash, the database file did not always shrink because old transaction log pages were not removed from the file.
@changelog_1145_li
@changelog_1154_li
Various CallableStatement methods could throw a NullPointerException.
@changelog_1146_li
@changelog_1155_li
LOB files were not deleted when running DROP ALL OBJECTS.
@changelog_1147_li
@changelog_1156_li
MS SQL Server compatibility: support "N" in front of string literals ("National Language" strings). Issue 240.
@changelog_1148_li
@changelog_1157_li
CAST: when converting a string to binary, it is hex encoded (every byte two characters); a hex string can be converted to a number by first converting it to binary. Examples: CAST(CAST('FFFF' AS BINARY) AS INT) = 65535, CAST(65535 AS BINARY) = '0000FFFF'.
@changelog_1149_li
@changelog_1158_li
When a domain (user defined data type) contained a user defined function, the database could not be opened.
@changelog_1150_li
@changelog_1159_li
CAST('011' AS INT) will no longer use decode the value as an octal number (using Integer.decode) but now use Integer.parseInt. The same logic applied to byte, short, and long. This also means that trying to convert hex numbers (0x...) with CAST now fails.
@changelog_1151_li
@changelog_1160_li
A table in the Recover tool script could not be imported if the script contained duplicate keys.
@changelog_1152_h2
@changelog_1161_h2
Version 1.2.144 (2010-10-15)
@changelog_1153_li
@changelog_1162_li
The Windows .bat files did not contain CR+LF.
@changelog_1154_li
@changelog_1163_li
The LOB storage (when the system property h2.lobInDatabase is set) is now only initialized when needed.
@changelog_1155_li
@changelog_1164_li
The index condition columnName IS NULL was not efficient when using a clustered index.
@changelog_1156_li
@changelog_1165_li
The Recover tool did not work for databases larger than 2 GB.
@changelog_1157_li
@changelog_1166_li
In memory database: outer joins with a condition "column is null" could return the wrong result.
@changelog_1158_li
@changelog_1167_li
Temporary files were not created in the temporary directory of the system, but in the current working directory. This affected temporary undo log files for read-only databases, temporary files for large result sets when using read-only databases, and temporary LOB files when storing LOBs in the database (system property h2.lobInDatabase). When the setting h2.lobInDatabase is not set, temporary LOB files are still stored in a sub-directory (.lobs.db/) of the current working directory.
@changelog_1159_li
@changelog_1168_li
New experimental feature to speed up CREATE TABLE ... AS SELECT. To enable the feature, set the system property h2.optimizeInsertFromSelect to true. For large queries, performance can be doubled.
@changelog_1160_li
@changelog_1169_li
When LOB objects are stored in the database (using the experimental setting h2.lobInDatabase), and using the MVCC mode, opening a database with uncommitted transactions could throw a NullPointerException.
@changelog_1161_li
@changelog_1170_li
Support of stored procedures with OUT parameters in CallableStatement is implemented.
@changelog_1162_li
@changelog_1171_li
PreparedStatement.getMetaData() was not always consistent with resulting ResultSet.getMetaData().
@changelog_1163_li
@changelog_1172_li
The build tool now uses JAVA_HOME for javac as well. Issue 233.
@changelog_1164_li
@changelog_1173_li
Opening and closing encrypted databases is now much faster.
@changelog_1165_li
@changelog_1174_li
H2 Console: new experimental feature to support file download and upload, but only if there is a directory called "transfer" in the current working directory. For security reasons, only very simple file names are supported. Sub-directories are not supported. To upload, use transfer.jsp; to download, use transfer/fileName.
@changelog_1166_li
@changelog_1175_li
A new sample application that shows how to manually create an encrypted and compressed script file.
@changelog_1167_li
@changelog_1176_li
Performance has been improved a bit.
@changelog_1168_li
@changelog_1177_li
DatabaseMetaData.getJDBCMajorVersion now returns 4 (instead of 3) when the driver is compiled with Java 6 (the default).
@changelog_1169_li
@changelog_1178_li
Re-added the internal utility class BitField which improves performance of opening and closing a database (because it supports setByte / getByte, unlike java.util.BitSet).
@changelog_1170_li
@changelog_1179_li
INFORMATION_SCHEMA.SESSIONS: the start time of a SQL statement is no longer set in each case. It is only set for long running statements. This change should improve performance a bit on some devices, specially when using Android.
@changelog_1171_li
@changelog_1180_li
A old databases without user name and password (created with H2 version 1.2.142 or older) couldn't be opened with version 1.2.143. Fixed.
@changelog_1172_li
@changelog_1181_li
The database upgrade classes have been renamed.
@changelog_1173_li
@changelog_1182_li
The database did not automatically upgrade when using a connection pool or data source.
@changelog_1174_li
@changelog_1183_li
JaQu: a database object can now also be created using a DataSource. Issue 227.
@changelog_1175_li
@changelog_1184_li
The built-in profiler now better supports the Dalvik VM.
@changelog_1176_li
@changelog_1185_li
The jarSmall build target no longer includes assertions (SysProperties.CHECK, CHECK2, system properties h2.check and h2.check2).
@changelog_1177_li
@changelog_1186_li
The jarSmall build target excluded the DbUpgrade classes by mistake.
@changelog_1178_h2
@changelog_1187_h2
Version 1.2.143 (2010-09-18)
@changelog_1179_li
@changelog_1188_li
If the user name and password are not set or empty, then the password is not hashed. To disable this behavior, set the system property h2.emptyPassword to false. TCP server: the default user name for the management database is now an empty string.
@changelog_1180_li
@changelog_1189_li
Cluster: auto-commit was disabled after opening a connection.
@changelog_1181_li
@changelog_1190_li
Connection.getAutoCommit() is now much faster, specially when using the server mode.
@changelog_1182_li
@changelog_1191_li
Statement.cancel() had no effect when using the server mode.
@changelog_1183_li
@changelog_1192_li
SCRIPT: the SQL script no longer contains settings that match the default value.
@changelog_1184_li
@changelog_1193_li
Statement.cancel() did not work when running RUNSCRIPT and SCRIPT.
@changelog_1185_li
@changelog_1194_li
Statement.cancel() could cause a NullPointerException.
@changelog_1186_li
@changelog_1195_li
In some cases (specially when using a small cache size or a large database over 1 GB) for some operations like ALTER TABLE the data was written before the transaction log entries, which could cause a corrupt database if the process was killed during the ALTER TABLE operation. Thanks a lot to Victor Pyankov for helping solve this problem!
@changelog_1187_li
@changelog_1196_li
The Recover tool could throw a ArrayIndexOutOfBoundsException when trying to recover a corrupt database file.
@changelog_1188_li
@changelog_1197_li
The SCRIPT command and tool now uses the default file encoding for the system now instead of UTF-8 (as before). In most cases, this will not affect existing applications, as the encoding only affects how SQL identifiers (table names and so on) that contain special characters are stored. Table data is escaped, and therefore is no problem.
@changelog_1189_li
@changelog_1198_li
The SCRIPT command and tool now also support the CHARSET option (like RUNSCRIPT).
@changelog_1190_li
@changelog_1199_li
When closing a database, sometimes empty space in the database was not freed up.
@changelog_1191_li
@changelog_1200_li
Trying to create a view with parameters in the query will now throw an exception. So far, creating the view was allowed, but the parameter value was not used (null was used instead).
@changelog_1192_li
@changelog_1201_li
New experimental feature SHUTDOWN DEFRAG. This option re-orders the pages while closing the database so that table scans are faster.
@changelog_1193_li
@changelog_1202_li
When using the MULTI_THREADED option, concurrently reading from a database (specially from a larger database, or when using a small cache size) could throw an exception.
@changelog_1194_li
@changelog_1203_li
When adding a comment to a column that has a check constraint, the database couldn't be re-opened.
@changelog_1195_li
@changelog_1204_li
New system property h2.lobClientMaxSizeMemory to set the maximum size of a LOB object to keep in memory on the client side when using the server mode.
@changelog_1196_h2
@changelog_1205_h2
Version 1.2.142 (2010-08-31)
@changelog_1197_li
@changelog_1206_li
Documentation for using H2 on Android devices has been added under Tutorial - Android.
@changelog_1198_li
@changelog_1207_li
An ArrayIndexOutOfBoundsException was thrown when querying the table information_schema.function_aliases while there are any user defined aggregate functions.
@changelog_1199_li
@changelog_1208_li
The jar files are now about 50 KB smaller. In the last few versions they contained superfluous classes.
@changelog_1200_li
@changelog_1209_li
The default time to compact a database when closing (system property h2.maxCompactTime) is now 0.2 seconds instead of 1 second.
@changelog_1201_li
@changelog_1210_li
Opening an closing a database is now faster.
@changelog_1202_li
@changelog_1211_li
In theory, when using indexes with large index rows (or when using a very small page size), removing rows could throw an internal exception in some cases.
@changelog_1203_li
@changelog_1212_li
Inserting rows in reverse order could throw an ArrayIndexOutOfBoundsException in some cases (specially rows larger than the page size, which is 2 KB by default). Issue 226.
@changelog_1204_li
@changelog_1213_li
H2 Console: with Chrome and Safari, resizing the table/query frame doesn't work. Issue 225.
@changelog_1205_li
@changelog_1214_li
New experimental database file locking mechanism "FS" to use native file locking (no *.lock.db file is created in this case, and no background thread is started). This mechanism may not work on all systems (on some systems it's possible to lock the same file multiple times within the same virtual machine, and on some system native file locking is not working or unlocking is not working).
@changelog_1206_h2
@changelog_1215_h2
Version 1.2.141 (2010-08-22)
@changelog_1207_li
@changelog_1216_li
New experimental pseudo-encryption algorithm "FOG". It makes the data appear to be encrypted. This algorithm is cryptographically extremely weak, and should only be used to hide data from reading the plain text using a text editor. Please let us know if you think this is useful or not.
@changelog_1208_li
@changelog_1217_li
Documentation: the grammar and function documentation can now be easier translated.
@changelog_1209_li
@changelog_1218_li
Password hash: in addition to connecting with the plain text password, H2 now supports connecting with the password hash. Like this you don't have to store plain text passwords in config files. For details, see the documentation at Advanced / Password Hash.
@changelog_1210_li
@changelog_1219_li
Lucene 3.x support was added in the source code, however it is not yet enabled by default and is not yet supported when using the default h2 jar file. To enable Lucene 3.x support, the source code of H2 needs to be switched using <code>./build.sh -Dlucene=3 switchSource</code>, and then re-compile. To switch the source code back use <code>./build.sh -Dlucene=2 switchSource</code> (replace ./build.sh with build.bat on Windows). The plan is to use Lucene 3 by default in H2 version 1.3.x. Issue 147.
@changelog_1211_li
@changelog_1220_li
The native fulltext search could cause a Java level deadlock if searching from multiple connections concurrently.
@changelog_1212_li
@changelog_1221_li
CREATE FORCE VIEW didn't work in most cases if a referenced table didn't exist.
@changelog_1213_li
@changelog_1222_li
MVCC: when trying to insert two rows with the same key from two connections, the second connection immediately threw the exception "Unique index or primary key violation". Instead, the second connection now waits throwing the exception until the first connection committed the change (same as when trying to concurrently update the same row).
@changelog_1214_li
@changelog_1223_li
Server mode: if the client ran with a different timezone setting than the server, date values got shifted by the difference between the timezones. This problem affected the data types DATE, TIME, and TIMESTAMP, when using PreparedStatement.setDate / setTime / setTimestamp and ResultSet.getDate / getTime / getTimestamp. To solve the problem, both the client and the server need to be updated (otherwise the old transfer protocol is used).
@changelog_1215_li
@changelog_1224_li
The built-in connection pool (JdbcConnectionPool) did not always honor the login timeout (the timeout could occur much too early). Thanks a lot to Dario Fassi for the patch!
@changelog_1216_li
@changelog_1225_li
Translation: the new messages have been translated to Spanish. Thanks a lot to Dario Fassi!
@changelog_1217_li
@changelog_1226_li
The table INFORMATION_SCHEMA.SETTINGS now contains all H2-specific system properties (the ones that start with "h2.") and that are explicitly set. Previously, some H2-specific settings (for example h2.analyzeAuto) were missing in this list.
@changelog_1218_li
@changelog_1227_li
EXPLAIN ANALYZE with an in-memory database threw an exception. Issue 216.
@changelog_1219_li
@changelog_1228_li
Data modifications (inserts, updates, and deletes) are now up to 5 times faster because converting objects to byte arrays is avoided if possible.
@changelog_1220_li
@changelog_1229_li
LOG=0 is now a bit faster (previously undo log entries were still written).
@changelog_1221_li
@changelog_1230_li
The command line tools now say so if the source directory of an option doesn't exist.
@changelog_1222_li
@changelog_1231_li
It is now allowed to truncate a table if referential integrity has been disabled for this table or database.
@changelog_1223_li
@changelog_1232_li
For unencrypted databases, the automatic upgrade temporary script file is now unencrypted again.
@changelog_1224_h2
@changelog_1233_h2
Version 1.2.140 (2010-07-25)
@changelog_1225_li
@changelog_1234_li
The default MAX_LOG_SIZE is now 16 MB instead of 2 MB. Some uses cases are 3 times faster now.
@changelog_1226_li
@changelog_1235_li
Improved cache memory usage calculation.
@changelog_1227_li
@changelog_1236_li
Only resources that are actually used are loaded in memory. This can reduce the memory usage by about 400 KB.
@changelog_1228_li
@changelog_1237_li
Profiling: the jar file can now be installed as an agent using java -javaagent:h2*.jar - this was be used to more accurately calculate the memory footprint of the cache. It has no effect when using H2 (using this feature in an application is not needed and not recommended).
@changelog_1229_li
@changelog_1238_li
The cache was not used efficiently when reading (behaving like a FIFO cache instead of an LRU cache).
@changelog_1230_li
@changelog_1239_li
Storing lobs in the database has been changed. It is now faster. Unfortunately, the change is not backward compatible; if you have used h2.lobInDatabase before you will need to re-build the database.
@changelog_1231_li
@changelog_1240_li
SHUTDOWN COMPACT is now faster.
@changelog_1232_li
@changelog_1241_li
H2 Console: requesting the status did not always show the window on top of others.
@changelog_1233_li
@changelog_1242_li
H2 Console: on some system, the browser windows got opened when requesting a new one.
@changelog_1234_li
@changelog_1243_li
The built-in profiling tool now uses a default stack depth of 32 elements and a default interval of 10 ms.
@changelog_1235_li
@changelog_1244_li
Database files now grows in 1 MB blocks (and at least 20% at a time), instead of always 256 KB. This speeds up loading a new database.
@changelog_1236_li
@changelog_1245_li
H2 Console: new built-in command @sleep to help profile another session.
@changelog_1237_li
@changelog_1246_li
For improved performance, LOG=0 and LOG=1 are again supported. LOG=0 means the transaction log is disabled completely (fastest; for loading a database). LOG=1 means the transaction log is enabled, but FileDescriptor.sync is disabled (if no protection against power failure is required). LOG=2 is the default (transaction log is enabled, FileDescriptor.sync for each checkpoint).
@changelog_1238_li
@changelog_1247_li
After deleting a lot of data (for example by dropping or altering tables, or indexes, or after a large transaction), opening a large database was very slow. Fixed.
@changelog_1239_li
@changelog_1248_li
When killing the process after creating and dropping many tables (specially temporary tables), the database could not be opened sometimes.
@changelog_1240_li
@changelog_1249_li
CAST(NULL AS ...) doesn't forget the data type, precision, and scale any longer.
@changelog_1241_li
@changelog_1250_li
Experimental support for recursive queries (see 'Advanced' - 'Recursive Queries' for details).
@changelog_1242_li
@changelog_1251_li
Problems with JDK 1.6.0_18 have been reports in the class StringUtils.quoteRemarkSQL. This method is now changed.
@changelog_1243_li
@changelog_1252_li
The "small jar" distribution did not include the CompressTool, which was required for some operations. Fixed.
@changelog_1244_li
@changelog_1253_li
The build tool now supports (minimalistic) shell mode, started using ./build.sh -
@changelog_1245_li
@changelog_1254_li
IS NULL comparison with nested queries and linked tables did not work. Example: select * from (select x from test) where x is null.
@changelog_1246_li
@changelog_1255_li
Support for null-safe equals. This includes the ANSI SQL standard syntax A IS [NOT] DISTINCT FROM B as well as the shorter A IS [NOT] B.
@changelog_1247_li
@changelog_1256_li
Primary key violations threw a strange exception message when using a single column INT or BIGINT key.
@changelog_1248_li
@changelog_1257_li
EXPLAIN ANALYZE now also lists the number of pages read from the file.
@changelog_1249_li
@changelog_1258_li
Memory mapped files: There was a bug in version 1.2.139 so that memory mapped files could only be used together with split, for example: split:nioMapped: - the problem is now solved. It is still a good idea to use split:nioMapped: to work around the 2 GB limitation of memory mapped files.
@changelog_1250_li
@changelog_1259_li
Memory mapped files: the system property h2.nioCleanerHack is now disabled by default because it was not always working as expected. Now System.gc() is used in a loop until the buffer is garbage collected. This of course is also not a nice solution, but the only one known to work. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038
@changelog_1251_li
@changelog_1260_li
Bugfixes for the automatic 1.1 db migration.
@changelog_1252_li
@changelog_1261_li
If an old 1.1 database file version is found on connect, it is now possible to let the old h2 classes (v 1.2.128) connect to the database. The automatic upgrade .jar file must be present, and the url must contain NO_UPGRADE=TRUE
@changelog_1253_li
@changelog_1262_li
The automatic upgrade temporary script file is now encrypted.
@changelog_1254_h2
@changelog_1263_h2
Version 1.2.139 (2010-07-10)
@changelog_1255_li
@changelog_1264_li
There was a bug in the internal IntIntHashMap. There were no known side effects however.
@changelog_1256_li
@changelog_1265_li
ANALYZE now uses less memory.
@changelog_1257_li
@changelog_1266_li
Memory mapped file system: improved error messages if there is a problem.
@changelog_1258_li
@changelog_1267_li
The Lucene fulltext search did not work well when using special file systems such as split or nioMapped.
@changelog_1259_li
@changelog_1268_li
The memory mapped file system (nioMapped: file prefix) couldn't seek past the file length.
@changelog_1260_li
@changelog_1269_li
Some file system operations did not work with stacked file systems (for example split and nioMapped). This also affected the DeleteDbFiles tool.
@changelog_1261_li
@changelog_1270_li
New experimental query cache. The cache is only used if the SQL statement and all parameters match. Each session has it's own cache with the given size. Only the last returned result per query is cached. Only SELECT statements are cached (excluding UNION and FOR UPDATE statements). This works for both statements and prepared statement. To enable, set the system property h2.commandCacheSize to a value larger than 0. There is currently no plan to enable this option by default in future versions.
@changelog_1262_li
@changelog_1271_li
Conditions with many OR operations could throw an UnsupportedOperationException if h2.optimizeOr was enabled.
@changelog_1263_li
@changelog_1272_li
XA connection: after transaction commit or rollback, the physical connection is set into autocommit mode.
@changelog_1264_li
@changelog_1273_li
MULTI_THREADED did not work correctly and could throw the exception "try to add a record twice" for larger databases because cache access was not correctly synchronized.
@changelog_1265_li
@changelog_1274_li
Automatic database upgrade from non page store is now possible. If the classes from the h2mig_pagestore_addon.jar file are in the classpath, the database will be converted to the current page store format automatically. The file can be found here: <a href="http://h2database.com/h2mig_pagestore_addon.jar">http://h2database.com/h2mig_pagestore_addon.jar</a>
@changelog_1266_li
@changelog_1275_li
The MultiDimension tools was extended with a few helper methods. The API was unified a bit.
@changelog_1267_li
@changelog_1276_li
ODBC: MS Access could not link to a table with unique index or primary key. To solve this problem, index meta data is currently disabled for ODBC. When using the new H2 version to access a database over ODBC, the PostgreSQL catalog is automatically upgraded. Using a database with an upgraded PostgreSQL catalog with an older version of H2 is still possible, but not over ODBC.
@changelog_1268_li
@changelog_1277_li
ODBC: MS Access could not link to a table with a name containing '_'.
@changelog_1269_li
@changelog_1278_li
ODBC: additional connection settings can now be added to the database name. Example: ~/test;cipher=xtea. Therefore, encrypted databases are supported.
@changelog_1270_li
@changelog_1279_li
Local temporary tables can now be created without having to commit a transaction using CREATE LOCAL TEMPORARY TABLE TEMP(ID INT PRIMARY KEY) TRANSACTIONAL.
@changelog_1271_li
@changelog_1280_li
New system property h2.dropRestrict (default false) to change the default action for DROP TABLE and DROP VIEW (false for CASCADE, true for RESTRICT). The plan is to enable this property by default in version 1.3.x.
@changelog_1272_li
@changelog_1281_li
DROP TABLE now also supports CASCADE (still the default) and RESTRICT.
@changelog_1273_li
@changelog_1282_li
The wrong exception was thrown when trying to connect to a server if the server was not running.
@changelog_1274_li
@changelog_1283_li
UNION queries where the first query contains a nested query were parsed incorrectly. Example: "select 1 from (select 2 from dual) union select 3 from dual" was parsed as "select 1 from ((select 2 from dual) union select 3 from dual)". Fixed.
@changelog_1275_li
@changelog_1284_li
Support ALTER SCHEMA name RENAME TO newName (rename schema). (patch from Kerry Sainsbury)
@changelog_1276_h2
@changelog_1285_h2
Version 1.2.138 (2010-06-27)
@changelog_1277_li
@changelog_1286_li
Referential integrity: it was not allowed to delete a row with NULL in the parent table, if there was a row with NULL in the child table.
@changelog_1278_li
@changelog_1287_li
Experimental feature to support case sensitive catalog names and database names using the DATABASE() method. To use this feature, set the system property h2.databaseToUpper to false. The plan is to set the property to false by default in version 1.3.x. Issue 204 - thanks to Sylvain Cuaz (ILM Informatique) for the patch.
@changelog_1279_li
@changelog_1288_li
Experimental feature to support nested joins. To enable, set the system property h2.nestedJoins to true. If enabled, nested joins and right outer joins should work as expected (issues 145, 177, and 203). The plan is to enable this feature by default in version 1.3.x.
@changelog_1280_li
@changelog_1289_li
New sample application: CachedPreparedStatements.
@changelog_1281_li
@changelog_1290_li
When creating functions within a schema, those functions could not be used in views, nested queries, and constraints. Fixed.
@changelog_1282_li
@changelog_1291_li
The benchmarks have been run using recent database versions.
@changelog_1283_li
@changelog_1292_li
Version 1.2.137 could still not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision).
@changelog_1284_li
@changelog_1293_li
Cluster: non-admin users could not connect when one of the cluster node was stopped. Issue 206.
@changelog_1285_li
@changelog_1294_li
DROP VIEW now supports the CASCADE and RESTRICT clauses (patch from Kerry Sainsbury)
@changelog_1286_li
@changelog_1295_li
CREATE VIEW now supports the OR REPLACE clause (patch from Kerry Sainsbury)
@changelog_1287_li
@changelog_1296_li
Build tool: ability to only run one test using the -Dtest=className setting. eg: build -Dtest=org.h2.test.db.TestViewDropView test (patch from Kerry Sainsbury).
@changelog_1288_h2
@changelog_1297_h2
Version 1.2.137 (2010-06-06)
@changelog_1289_li
@changelog_1298_li
Statements with a nested query and a condition that was always NULL threw an IndexOutOfBoundsException. Example: select * from (select null as x) where x=1
@changelog_1290_li
@changelog_1299_li
The changes that were made to support large transactions also fixed a bug with large transactions (when the undo log file size is larger than 2 GB).
@changelog_1291_li
@changelog_1300_li
Experimental feature to support very large transactions (except when using MVCC). To enable, set the system property h2.largeTransactions to true. If enabled, changes to tables without a primary key can be buffered to disk. The plan is to enable this feature by default in version 1.3.x.
@changelog_1292_li
@changelog_1301_li
H2 Console: editing result sets is now also working for database other than H2, if they do support updatable result sets. Add "@edit" before the query. Only limited testing has been done on this feature, some data types may not work (please provide feedback if you find issues).
@changelog_1293_li
@changelog_1302_li
Cluster: an open transaction was committed when a cluster node was stopped (because disabling the cluster executes SET CLUSTER '', which committed the transaction). Transaction are no longer committed when calling SET CLUSTER. Issue 199.
@changelog_1294_li
@changelog_1303_li
Cluster: non-admin users couldn't connect to the cluster and couldn't disable the cluster. Issue 201.
@changelog_1295_li
@changelog_1304_li
Cluster: NEXTVAL('sequence') was only called on one cluster node, therefore sequence values could get out of sync.
@changelog_1296_li
@changelog_1305_li
Version 1.2.136 could not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision). A workaround has been implemented.
@changelog_1297_li
@changelog_1306_li
The error code of IO exceptions in CSV functions was incorrect.
@changelog_1298_li
@changelog_1307_li
The TriggerPassData example now uses a prefix (the database name).
@changelog_1299_li
@changelog_1308_li
The wrong exception was thrown when trying to reference a table that doesn't support references such as a table in the information schema.
@changelog_1300_li
@changelog_1309_li
Server.shutdownTcpServer can now stop all TCP servers on this JVM.
@changelog_1301_li
@changelog_1310_li
JdbcConnectionPool: the default connection timeout is now 30 seconds (it used to be 5 minutes).
@changelog_1302_li
@changelog_1311_li
LOB storage: LOBs added with "h2.lobInDatabase" enabled couldn't be read later with this option disabled.
@changelog_1303_h2
@changelog_1312_h2
Version 1.2.136 (2010-05-24)
@changelog_1304_li
@changelog_1313_li
When using ORDER BY and there are both ascending and descending indexes, the database used the first index even when the second one could be used for sorting.
@changelog_1305_li
@changelog_1314_li
Conditions of the form columnName IS NULL now use an index. To disable this feature, set the system property h2.optimizeIsNull to false.
@changelog_1306_li
@changelog_1315_li
H2 Console: when the settings were not stored yet (for example when running for the first time), the last recently used settings were not stored. A workaround was to create the file ".h2.server.properties" manually in the current user home directory, with the contents: webAllowOthers=false, webPort=8082, webSSL=false, 0=Generic H2 (Embedded)|org.h2.Driver|jdbc\:h2\:~/test|sa (where a comma is a newline).
@changelog_1307_li
@changelog_1316_li
The source code is now switched to Java 6 (JDK 1.6) by default. Java 5 (JDK 1.5) is still supported, and the jar file is still compiled for Java 5.
@changelog_1308_li
@changelog_1317_li
The BOM (the byte-order-mark) character 0xfeff at the beginning of the file is ignored. This is for compatibility with Microsoft Excel.
@changelog_1309_li
@changelog_1318_li
When opening an existing database, the cache size is set to at most half the amount of memory available for the virtual machine (Runtime.getRuntime().maxMemory()), even if the cache size setting stored in the database is larger. Setting the cache size in the database URL or explicitly using SET CACHE_SIZE overrides this value (even if larger than the physical memory).
@changelog_1310_li
@changelog_1319_li
INFORMATION_SCHEMA.SETTINGS: the cache size is now returned in KB.
@changelog_1311_li
@changelog_1320_li
New system property h2.selectForUpdateMvcc, the default is false (the feature is disabled). When enabled, SELECT ... FOR UPDATE only locks the selected rows in the MVCC mode. Aggregate or GROUP BY queries are not allowed in this case.
@changelog_1312_li
@changelog_1321_li
Profiler: improved message if there was no stack trace.
@changelog_1313_li
@changelog_1322_li
The H2 Console can now be used within another application, in a frame or iframe. Issue 197.
@changelog_1314_li
@changelog_1323_li
Recover tool: the statistics section now includes page type counts again.
@changelog_1315_li
@changelog_1324_li
Queries with multiple IN(...) conditions sometimes return the wrong results when there was a multi-column index for the column.
@changelog_1316_li
@changelog_1325_li
Queries with IN(..., NULL) did sometimes return the wrong results when there was a index for the column.
@changelog_1317_li
@changelog_1326_li
DECIMAL: faster precision and memory usage calculations.
@changelog_1318_li
@changelog_1327_li
A new class org.h2.tools.TriggerAdapter allows to use the ResultSet interface within trigger implementations.
@changelog_1319_li
@changelog_1328_li
A subselect which used an index could lead to wrong results. Fixed.
@changelog_1320_li
@changelog_1329_li
Creating a cached temporary non persistent table with a primary key threw a NullPointerException.
@changelog_1321_h2
@changelog_1330_h2
Version 1.2.135 (2010-05-08)
@changelog_1322_li
@changelog_1331_li
Temporary files were not deleted when using large transactions, disabling autocommit, and closing the session without committing.
@changelog_1323_li
@changelog_1332_li
Queries using multiple IN(..) conditions on the same table could cause repeated rows in the result set.
@changelog_1324_li
@changelog_1333_li
Translation: Lubomir Grajciar translated the H2 Console as well as all error message to Slovensky. Thanks a lot!
@changelog_1325_li
@changelog_1334_li
There was a possible Java level deadlock when opening an uninitialized database and using a file system that also opened a database.
@changelog_1326_li
@changelog_1335_li
When killing the process while the database was writing a checkpoint, while it was closing, or while running recovery (while removing temporary tables from a previous run), the database could become corrupt. A new test case has been implemented to ensure such problems can not occur in the future.
@changelog_1327_li
@changelog_1336_li
File system: new method FileSystem.setReadOnly.
@changelog_1328_li
@changelog_1337_li
The page size for new databases can now be set in the database URL using ;PAGE_SIZE=512. Currently this feature is only used to simplify testing.
@changelog_1329_li
@changelog_1338_li
New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1330_li
@changelog_1339_li
Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1331_li
@changelog_1340_li
Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1332_li
@changelog_1341_li
Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1333_li
@changelog_1342_li
Auto-reconnect: if another connection uses the database in exclusive mode then this connection will try to re-connect until the exclusive mode ends. This is important when using the cluster mode.
@changelog_1334_li
@changelog_1343_li
SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1335_li
@changelog_1344_li
Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1336_li
@changelog_1345_li
Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1337_li
@changelog_1346_li
The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1338_li
@changelog_1347_li
The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1339_li
@changelog_1348_li
The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1340_li
@changelog_1349_li
Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1341_li
@changelog_1350_li
Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1342_li
@changelog_1351_li
The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1343_li
@changelog_1352_li
When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1344_li
@changelog_1353_li
Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1345_li
@changelog_1354_li
UNIQUE was not listed as a keyword.
@changelog_1346_li
@changelog_1355_li
Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1347_li
@changelog_1356_li
For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1348_li
@changelog_1357_li
The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1349_li
@changelog_1358_li
If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1350_li
@changelog_1359_li
New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1351_li
@changelog_1360_li
INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1352_h2
@changelog_1361_h2
Version 1.2.134 (2010-04-23)
@changelog_1353_li
@changelog_1362_li
New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1354_li
@changelog_1363_li
JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1355_li
@changelog_1364_li
MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1356_li
@changelog_1365_li
MERGE did not respect foreign key and check constraints.
@changelog_1357_li
@changelog_1366_li
ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1358_li
@changelog_1367_li
When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1359_li
@changelog_1368_li
Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1360_li
@changelog_1369_li
H2 Console: the built-in commands are now documented.
@changelog_1361_li
@changelog_1370_li
REPLACE: if any parameter is null, the result is null.
@changelog_1362_li
@changelog_1371_li
Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1363_li
@changelog_1372_li
The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1364_li
@changelog_1373_li
H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1365_li
@changelog_1374_li
The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1366_li
@changelog_1375_li
The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1367_li
@changelog_1376_li
Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1368_li
@changelog_1377_li
If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1369_h2
@changelog_1378_h2
Version 1.2.133 (2010-04-10)
@changelog_1370_li
@changelog_1379_li
A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1371_li
@changelog_1380_li
The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1372_li
@changelog_1381_li
The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1373_li
@changelog_1382_li
Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1374_li
@changelog_1383_li
The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1375_li
@changelog_1384_li
New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1376_li
@changelog_1385_li
ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1377_li
@changelog_1386_li
Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1378_li
@changelog_1387_li
Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1379_li
@changelog_1388_li
When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1380_li
@changelog_1389_li
Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1381_li
@changelog_1390_li
H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1382_li
@changelog_1391_li
H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1383_h2
@changelog_1392_h2
Version 1.2.132 (2010-03-21)
@changelog_1384_li
@changelog_1393_li
The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1385_li
@changelog_1394_li
User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1386_li
@changelog_1395_li
Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1387_li
@changelog_1396_li
When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1388_li
@changelog_1397_li
The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1389_li
@changelog_1398_li
Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1390_li
@changelog_1399_li
When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1391_li
@changelog_1400_li
The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1392_li
@changelog_1401_li
CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1393_li
@changelog_1402_li
Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1394_li
@changelog_1403_li
The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1395_li
@changelog_1404_li
When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1396_li
@changelog_1405_li
Literals of type BIGINT now have the correct data type.
@changelog_1397_h2
@changelog_1406_h2
Version 1.2.131 (2010-03-05)
@changelog_1398_li
@changelog_1407_li
Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1399_li
@changelog_1408_li
In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1400_li
@changelog_1409_li
After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1401_li
@changelog_1410_li
An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1402_h2
@changelog_1411_h2
Version 1.2.130 (2010-02-26)
@changelog_1403_li
@changelog_1412_li
EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1404_li
@changelog_1413_li
IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1405_li
@changelog_1414_li
IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1406_li
@changelog_1415_li
For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1407_li
@changelog_1416_li
PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1408_li
@changelog_1417_li
A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1409_li
@changelog_1418_li
When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1410_li
@changelog_1419_li
Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1411_li
@changelog_1420_li
The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1412_li
@changelog_1421_li
Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1413_li
@changelog_1422_li
Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1414_h2
@changelog_1423_h2
Version 1.2.129 (2010-02-19)
@changelog_1415_li
@changelog_1424_li
The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
@changelog_1416_li
@changelog_1425_li
CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1417_li
@changelog_1426_li
MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1418_li
@changelog_1427_li
Hash indexes now are only used for single column indexes.
@changelog_1419_li
@changelog_1428_li
The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
@changelog_1420_li
@changelog_1429_li
The file system abstraction no longer throws SQL exceptions.
@changelog_1421_li
@changelog_1430_li
DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1422_li
@changelog_1431_li
The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1423_li
@changelog_1432_li
SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1424_li
@changelog_1433_li
When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
@changelog_1425_li
@changelog_1434_li
The BNF parser now uses the visitor pattern.
@changelog_1426_li
@changelog_1435_li
Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1427_li
@changelog_1436_li
The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
@changelog_1428_li
@changelog_1437_li
H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1429_li
@changelog_1438_li
A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1430_li
@changelog_1439_li
The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1431_li
@changelog_1440_li
Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1432_li
@changelog_1441_li
Server.startWebServer(Connection) was not working as expected.
@changelog_1433_li
@changelog_1442_li
The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1434_li
@changelog_1443_li
The database URL option RECOVER has currently no effect.
@changelog_1435_li
@changelog_1444_li
Converting an old (non-page store) database is no longer supported using this version.
@changelog_1436_li
@changelog_1445_li
The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
@changelog_1437_li
@changelog_1446_li
The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1438_li
@changelog_1447_li
Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
@changelog_1439_li
@changelog_1448_li
The translated resources are now stored in UTF-8 format.
@changelog_1440_li
@changelog_1449_li
The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1441_h2
@changelog_1450_h2
Version 1.2.128 (2010-01-30)
@changelog_1442_li
@changelog_1451_li
There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
@changelog_1443_li
@changelog_1452_li
The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1444_li
@changelog_1453_li
Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1445_li
@changelog_1454_li
Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1446_li
@changelog_1455_li
If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
@changelog_1447_li
@changelog_1456_li
Less classes are loaded when using the database in embedded mode.
@changelog_1448_li
@changelog_1457_li
The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
@changelog_1449_li
@changelog_1458_li
Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
@changelog_1450_li
@changelog_1459_li
Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
@changelog_1451_li
@changelog_1460_li
Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1452_li
@changelog_1461_li
Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1453_li
@changelog_1462_li
MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
@changelog_1454_li
@changelog_1463_li
If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1455_li
@changelog_1464_li
Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1456_li
@changelog_1465_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1457_li
@changelog_1466_li
Slightly improved performance if the table is already locked.
@changelog_1458_li
@changelog_1467_li
CompressLZF: faster decompression.
@changelog_1459_li
@changelog_1468_li
PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1460_li
@changelog_1469_li
Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@cheatSheet_1000_h1
...
...
@@ -10393,16 +10420,19 @@ Single-column primary key values are always stored explicitly. This is not requi
@roadmap_1494_li
Compatibility with MySQL: support CREATE TABLE TEST(NAME VARCHAR(255) CHARACTER SET UTF8).
@roadmap_1495_h2
@roadmap_1495_li
CALL is incompatible with other databases because it returns a result set, so that CallableStatement.execute() returns true.
@roadmap_1496_h2
Not Planned
@roadmap_1496_li
@roadmap_1497_li
HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
@roadmap_1497_li
@roadmap_1498_li
String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@roadmap_1498_li
@roadmap_1499_li
In prepared statements, identifier names (table names and so on) can not be parameterized. Adding such a feature would complicate the source code without providing reasonable speedup, and would slow down regular prepared statements.
#Documentation on how data is stored internally and how indexes work (in the performance section).
#Build-in documentation search: improved results if searching for multiple words.
@changelog_1003_li
#Some people reported NullPointerException in FileObjectDiskMapped. The most likely explanation is that multiple threads access the same object at the same time. Therefore, the public methods in this class are now synchronized.
#DatabaseMetaData.getColumns: there is a typo in the JDBC specification, so that the column #19 is named SCOPE_CATLOG instead of SCOPE_CATALOG. For compatibility with the specification, this column is now also named SCOPE_CATLOG in H2. A new column named SCOPE_CATALOG is appended as column #24. Please note that MySQL only supports SCOPE_CATALOG, while other databases only support SCOPE_CATLOG.
@changelog_1004_li
#Improved error detection when starting a server with invalid arguments, such as "-tcpPort=9091" or "-tcpPort 9091" (as one parameter) instead of "-tcpPort", "9091".
#Build: jar files are now downloaded using Maven if possible (and cached in the local Maven repository). Unfortunately, in many cases this will download more data from the Maven repository.
@changelog_1005_li
#The function STRINGDECODE ignored characters after a non-escaped double quote. This is no longer the case.
#JaQu has been improved a lot thanks to the new committer James Moger.
@changelog_1006_li
#The new CSV option feature introduced in version 1.3.150 didn't support spaces. Now the escape mechanism is changed to support it.
#New sample application that shows how to use "instead of" triggers to support updatable views.
@changelog_1007_li
#The pseudo-column "_ROWID_" now supports insert, update, and merge (only enabled for version 1.3.x).
#H2 Console: opening a MS SQL Server database is now faster. Also, listing the database meta data sometimes resulted in an exception.
@changelog_1008_li
#Linked tables / MS SQL Server: if the tables were created in mixed case in MS SQL Server, then the identifiers in the linked tables were case sensitive (in H2).
@changelog_1009_li
#MVCC: the probability of a lock timeout is now lower if multiple threads try to update the same rows.
@changelog_1010_li
#Building only the documentation (without compiling all classes) didn't work, specially: ./build.sh clean javadocImpl.
@changelog_1011_li
#Documentation on how data is stored internally and how indexes work (in the performance section).
@changelog_1012_li
#Some people reported NullPointerException in FileObjectDiskMapped. The most likely explanation is that multiple threads access the same object at the same time. Therefore, the public methods in this class are now synchronized.
@changelog_1013_li
#Improved error detection when starting a server with invalid arguments, such as "-tcpPort=9091" or "-tcpPort 9091" (as one parameter) instead of "-tcpPort", "9091".
@changelog_1014_li
#The function STRINGDECODE ignored characters after a non-escaped double quote. This is no longer the case.
@changelog_1015_li
#The new CSV option feature introduced in version 1.3.150 didn't support spaces. Now the escape mechanism is changed to support it.
@changelog_1016_li
#The pseudo-column "_ROWID_" now supports insert, update, and merge (only enabled for version 1.3.x).
@changelog_1017_li
#Deleting rows in the trigger table inside a trigger could result in a NullPointerException.
@changelog_1009_h2
@changelog_1018_h2
#Version 1.3.151 Beta (2011-02-12)
@changelog_1010_li
@changelog_1019_li
#Server: it was possible to open a database outside of the base URL (if one was set). The test case was broken.
@changelog_1011_li
@changelog_1020_li
#The H2 Console tool now supports a database URL as a command line option.
@changelog_1012_li
@changelog_1021_li
#Clob.getSubString and Blob.getBytes are now up to 3 times faster.
@changelog_1013_li
@changelog_1022_li
#New database setting DEFAULT_CONNECTION (disabled by default) to support DriverManager.getConnection("jdbc:default:connection"). Please note the Oracle JDBC driver will try to resolve this database URL if it is loaded before the H2 driver.
@changelog_1014_li
@changelog_1023_li
#JaQu: the static map Db.TOKENS was not synchronized.
@changelog_1015_li
@changelog_1024_li
#DatabaseMetaData.getProcedureColumns returned the wrong data (it also returned the Connection parameter if there was any).
@changelog_1016_li
@changelog_1025_li
#Issue 284: If the query cache was used (enabled by default in version 1.3.x), and multiple threads used the same connection, and the same query but different prepared statements, parameters of one prepared statement could be overwritten by another.
@changelog_1017_li
@changelog_1026_li
#If the query cache was used (enabled by default in version 1.3.x), parameters of re-used queries were not reset in prepared statements.
@changelog_1018_li
@changelog_1027_li
#CallableStatement: the first row of the result set was skipped when using CallableStatement.execute().
@changelog_1019_li
@changelog_1028_li
#Batch update exceptions now include the root cause and all chained exceptions (getNextException).
@changelog_1020_li
@changelog_1029_li
#Reading a large result set with a BLOB or CLOB column could throw a NullPointerException.
@changelog_1021_li
@changelog_1030_li
#Support for the MS SQL Server syntax VARCHAR(MAX).
@changelog_1022_li
@changelog_1031_li
#The Recover tool could print "/ by zero" on an empty database.
@changelog_1023_li
@changelog_1032_li
#For tables without a single column primary key of type INT or LONG, the unique row id had gaps, which didn't look nice.
@changelog_1024_li
@changelog_1033_li
#Each table now has a pseudo-column "_ROWID_" to get the unique row id (only enabled for version 1.3.x).
@changelog_1025_li
@changelog_1034_li
#User defined functions can now have parameters of any class. Values of type OTHER (or OBJECT or JAVA_OBJECT) are automatically de-serialized in that case.
@changelog_1026_li
@changelog_1035_li
#Linked tables: for NUMERIC column, Oracle reports precision 0 and scale -127. A workaround has been implemented (the same as for DECIMAL columns in version 1.3.150).
@changelog_1027_li
@changelog_1036_li
#Issue 279: Auto-Server mode: unclear error message when trying to connect using AUTO_SERVER if the database is already open without the flag (Connection is broken: "null").
@changelog_1028_li
@changelog_1037_li
#Issue 238: Can drop a column that has a single-column constraint.
@changelog_1029_h2
@changelog_1038_h2
#Version 1.3.150 Beta (2011-01-28)
@changelog_1030_li
@changelog_1039_li
#CSVREAD / CSVWRITE: instead of setting the options one by one, all options can be combined into a space separated key-value pairs.
@changelog_1031_li
@changelog_1040_li
#CSVREAD / CSV tool: there is a new option "lineCommentCharacter" to set or disable line comments. For H2 version 1.2, the default is '#' (as before). For H2 version 1.3, line comments are disabled by default.
@changelog_1032_li
@changelog_1041_li
#Issue 277: JaQu didn't correctly convert a CLOB column to a String.
@changelog_1033_li
@changelog_1042_li
#./build.sh testNetwork could block if there was a network configuration problem.
@changelog_1034_li
@changelog_1043_li
#Reading input streams from the classpath is now supported. Example: RUNSCRIPT FROM 'classpath:org/h2/samples/newsfeed.sql'.
@changelog_1035_li
@changelog_1044_li
#PreparedStatement.toString() now includes the parameter values in a human readable format.
@changelog_1036_li
@changelog_1045_li
#New database setting OPTIMIZE_IN_SELECT (enabled by default for version 1.3.x). If enabled, IN(SELECT...) conditions are faster if there are many rows in the table or subquery.
@changelog_1037_li
@changelog_1046_li
#Linked tables: for DECIMAL column, Oracle reports precision 0 and scale -127. A workaround has been implemented.
@changelog_1038_li
@changelog_1047_li
#TCP Server: a base directory with a prefix with a database name with prefix didn't work as expected (this only applies to non-disk and wrapped file systems).
@changelog_1039_li
@changelog_1048_li
#Version 1.3: when re-running the same query so that the previous result was re-used, and if the result set was large so that it was stored externally (in a temp file or in a temp table), then reading rows from both result sets resulted in an exception or wrong behavior.
@changelog_1040_li
@changelog_1049_li
#A new sample application that shows how to create a read-only database in a zip file where the database file is split into multiple smaller parts.
@changelog_1041_li
@changelog_1050_li
#The Backup tool now supports compressing all files in a given directory.
@changelog_1042_li
@changelog_1051_li
#H2 Console: the special syntax @list and @meta can not be combined.
@changelog_1043_li
@changelog_1052_li
#The wrong error message was thrown when trying to open a database where the database file could not be read for some reason (for example because the split file system was used, and the file was split at the wrong position).
@changelog_1044_li
@changelog_1053_li
#There was a memory leak in the trace system. Opening and closing many connections could run out of memory.
@changelog_1045_li
@changelog_1054_li
#The scan-resistant cache type "TQ" (two queue) is again available. To use it, append ;CACHE_TYPE=TQ to the database URL.
@changelog_1046_h2
@changelog_1055_h2
#Version 1.3.149 Beta (2011-01-07)
@changelog_1047_li
@changelog_1056_li
#Lob in database: after the process was killed while adding a lob, inserting a lob could throw an exception (primary key violation in LOB_MAP).
@changelog_1048_li
@changelog_1057_li
#Server tool: the tcpShutdown feature now also stops other servers (web server and PostgreSQL server).
@changelog_1049_li
@changelog_1058_li
#Server tool: the tcpShutdown url must now end with the port if the port is used.
@changelog_1050_li
@changelog_1059_li
#Server tool: when starting one service fails, the started services are now stopped.
@changelog_1051_li
@changelog_1060_li
#Multi-version concurrency: SELECT ... FOR UPDATE threw a "concurrent update" exception immediately instead of a "lock timeout" exception after the set lock timeout if the row was already locked by another connection.
@changelog_1052_li
@changelog_1061_li
#Translation: the H2 Console and error messages have been translated to Czech by Hannibal (http://hannibal.cestiny.cz/). Thanks a lot!
@changelog_1053_li
@changelog_1062_li
#When the system property h2.lobInDatabase is set, reading a BLOB is a bit faster because the length is not read.
@changelog_1054_li
@changelog_1063_li
#The SimpleResultSet now has a feature to not close the result set after reading the last row.
@changelog_1055_li
@changelog_1064_li
#Native fulltext search: the ignore list doesn't need to be all uppercase now.
@changelog_1056_li
@changelog_1065_li
#Improved statistics output in the Recover tool.
@changelog_1057_li
@changelog_1066_li
#Issue 269: GROUP BY queries with a column or having clause that contains IN(SELECT ...) could return the wrong values. Example: SELECT X IN(SELECT Y) FROM Z GROUP BY X.
@changelog_1058_li
@changelog_1067_li
#After closing a database, the writer thread will stop almost immediately (instead of after at most 100 ms). This should avoid error messages in the Tomcat log file after a shutdown.
@changelog_1059_li
@changelog_1068_li
#Issue 271: ResultSet.getConcurrency() did not correctly detect that the result set is not updatable.
@changelog_1060_li
@changelog_1069_li
#The SLF4J 1.6 API is now used by default (this should not have any user visible effect).
@changelog_1061_li
@changelog_1070_li
#The org.h2.tools.Console no longer calls System.exit on shutdown (this should not have any user visible effect, but should allow to integrate the tool easier into other applications).
@changelog_1062_li
@changelog_1071_li
#Improved date / time arithmetics. Adding and subtracting a floating point value from a date or timestamp is now supported.
@changelog_1063_li
@changelog_1072_li
#When creating a BLOB with in InputStream or a CLOB with a Reader, and the InputStream or Reader threw an non-IOException, then the LOB storage was broken when storing LOBs in the database.
@changelog_1064_li
@changelog_1073_li
#EXPLAIN SELECT didn't include the sample size if one was set.
@changelog_1065_li
@changelog_1074_li
#Improved EXPLAIN plan formatting and documentation.
@changelog_1066_li
@changelog_1075_li
#Issue 266: Domains: a NOT NULL clause in a domain definition ignored.
@changelog_1067_li
@changelog_1076_li
#More accurate calculation of variance and standard deviation for large number of samples with low variance (now using Welford's method).
@changelog_1068_li
@changelog_1077_li
#Server: CLOB data with unicode characters between character code 0xd800 and 0xdfff were not transferred correctly. In many cases, the thread was stuck afterwards.
@changelog_1069_li
@changelog_1078_li
#Issue 264: the Hibernate dialect in src/tools was removed because it is outdated.
@changelog_1070_li
@changelog_1079_li
#Cache size limit could be exceeded for certain queries, leading to an OutOfMemoryError in some cases. Fixed.
@changelog_1071_h2
@changelog_1080_h2
#Version 1.3.148 Beta (2010-12-12)
@changelog_1072_li
@changelog_1081_li
#The built-in connection pool was simplified a bit. The dispose() method no longer throws an exception (it only logs it).
@changelog_1073_li
@changelog_1082_li
#The database upgrade (to upgrade from H2 version 1.1.x) has been simplified.
@changelog_1074_li
@changelog_1083_li
#The feature to log all errors (system properties h2.logAllErrors and h2.logAllErrorsFile) has been removed.
@changelog_1075_li
@changelog_1084_li
#When starting the H2 Console, the properties file can now be completely disabled.
@changelog_1076_li
@changelog_1085_li
#Server.openBrowser no longer writes to System.out directly if opening the URL failed.
@changelog_1077_li
@changelog_1086_li
#The INSERT optimizations (INSERT ... DIRECT SORTED SELECT) were not parsed correctly when using a column list.
@changelog_1078_li
@changelog_1087_li
#H2 Console: the tables and columns are now listed for SQLite as well.
@changelog_1079_li
@changelog_1088_li
#H2 Console: improved autocomplete feature (also simplified the source code for this feature).
@changelog_1080_li
@changelog_1089_li
#Issue 260: the DbStarter servlet context listener now starts the server before opening a connection, so that connecting using the server mode works.
@changelog_1081_li
@changelog_1090_li
#The Shell tool can now enable, disable, and display the current autocommit mode.
@changelog_1082_li
@changelog_1091_li
#Issue 259: there is a limitation in the cluster mode: The SQL statement SET AUTOCOMMIT FALSE doesn't work. To disable autocommit, the method Connection.setAutoCommit(false) needs to be called. This is now documented.
@changelog_1083_li
@changelog_1092_li
#Connection pool / DataSource: a NullPointerException was thrown when using a database URL that doesn't start with "jdbc:h2:".
@changelog_1084_li
@changelog_1093_li
#Using the java.sql.Blob or java.sql.Clob interfaces could throw the wrong exception after the object was closed.
@changelog_1085_li
@changelog_1094_li
#LOB: in server mode, if the feature "LOBs in database" is disabled, the temporary files are now created in the temp directory (the same as when "LOBs in database" is enabled).
@changelog_1086_h2
@changelog_1095_h2
#Version 1.2.147 (2010-11-21)
@changelog_1087_li
@changelog_1096_li
#H2 Console: the server properties directory can now be set on the command line using java ... -properties <directory>. Issue 159.
@changelog_1088_li
@changelog_1097_li
#New feature INSERT INTO ... DIRECT SELECT, mainly to speed up loading tables from a CSV file. When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step (without temporary file).
@changelog_1089_li
@changelog_1098_li
#Converting binary data to UUID was incorrect when the converting more than 31 bytes. Now always the first 16 bytes are used.
@changelog_1090_li
@changelog_1099_li
#Improved date / time arithmetics. Now supported are multiplying and dividing a time with / by a number, adding and subtracting a time to / from a time or date, subtracting a time or timestamp from a timestamp.
@changelog_1091_li
@changelog_1100_li
#The Ant build script has been removed because it is no longer up to date.
@changelog_1092_li
@changelog_1101_li
#Nested outer joins without brackets were not working as expected. Example: select * from a inner join b inner join c on c.id = b.id on b.id = a.id;
@changelog_1093_li
@changelog_1102_li
#JMX (the Java management extension) is now supported. Issue 253.
@changelog_1094_li
@changelog_1103_li
#Creating a comment on a column didn't work if the schema name was equal the database name.
@changelog_1095_li
@changelog_1104_li
#When using multi-version concurrency, re-running a prepared statement with the same parameters would sometimes give the same result even if another connection committed a change (the previous result was sometimes re-used incorrectly).
@changelog_1096_li
@changelog_1105_li
#When using SELECT_FOR_UPDATE_MVCC (lock only the selected rows when using MVCC), the selected rows were sometimes not locked correctly.
@changelog_1097_li
@changelog_1106_li
#When using Lucene 3, the index files were not always closed when the database was closed.
@changelog_1098_li
@changelog_1107_li
#Concurrently preparing a statement and altering a table could throw a table not found exception.
@changelog_1099_li
@changelog_1108_li
#When concurrently preparing many statements with a subquery, in some cases the query didn't run (Column "..." must be in the GROUP BY list).
@changelog_1100_li
@changelog_1109_li
#CallableStatement: now the syntax "{? = CALL...}" is supported as well.
@changelog_1101_li
@changelog_1110_li
#Lob in databases: two small BLOB or CLOB values were always considered equal. This also affected unique indexes.
@changelog_1102_li
@changelog_1111_li
#The shutdown hook is (re-) enabled by default even for H2 version 1.3.x.
@changelog_1103_li
@changelog_1112_li
#When creating a database from a recovery script, the same user can now be used (CREATE USER now always includes IF EXISTS).
@changelog_1104_li
@changelog_1113_li
#The H2 Console now prints a status message if started with parameters.
@changelog_1105_h2
@changelog_1114_h2
#Version 1.3.146 Beta (2010-11-08)
@changelog_1106_li
@changelog_1115_li
#This is a beta version. The next version will be 1.2.147. The differences between 1.2.x and 1.3.x are:
@changelog_1107_li
@changelog_1116_li
#In version 1.3.x, h2.lobInDatabase (store CLOB and BLOB in the database file) is enabled by default.
@changelog_1108_li
@changelog_1117_li
#In version 1.3.x, ANALYZE_AUTO is 2000 (automatic ANALYZE).
@changelog_1109_li
@changelog_1118_li
#In version 1.3.x, DB_CLOSE_ON_EXIT (the shutdown hook) is disabled by default.
@changelog_1110_li
@changelog_1119_li
#In version 1.3.x, DROP_RESTRICT (default action for DROP is RESTRICT) is enabled.
@changelog_1111_li
@changelog_1120_li
#In version 1.3.x, FUNCTIONS_IN_SCHEMA (allow to store functions in a schema) is enabled.
@changelog_1112_li
@changelog_1121_li
#In version 1.3.x, LARGE_TRANSACTIONS (support for very large transactions) is enabled. Changes to tables without a primary key can be buffered to disk.
@changelog_1113_li
@changelog_1122_li
#In version 1.3.x, MAX_MEMORY_ROWS_DISTINCT is set to a 10000.
@changelog_1114_li
@changelog_1123_li
#In version 1.3.x, NESTED_JOINS (nested joins and right outer joins) is enabled.
@changelog_1115_li
@changelog_1124_li
#In version 1.3.x, OPTIMIZE_INSERT_FROM_SELECT (speed up CREATE TABLE ... AS SELECT) is enabled.
@changelog_1116_li
@changelog_1125_li
#In version 1.3.x, OPTIMIZE_OR (convert OR conditions to IN(..) if possible) is enabled.
@changelog_1117_li
@changelog_1126_li
#In version 1.3.x, QUERY_CACHE_SIZE is enabled.
@changelog_1118_li
@changelog_1127_li
#In version 1.3.x, SELECT_FOR_UPDATE_MVCC (MVCC and SELECT FOR UPDATE) is enabled.
@changelog_1119_li
@changelog_1128_li
#In version 1.3.x, RUNSCRIPT and SCRIPT (commands and tools), use UTF-8 by default (ScriptCommand.charset).
@changelog_1120_li
@changelog_1129_li
#In version 1.3.x, Lucene 3 is used by default. Issue 147.
@changelog_1121_li
@changelog_1130_li
#When the system property h2.lobInDatabase is set, the lob tables were always created when closing the database, even if the tables were not needed.
@changelog_1122_li
@changelog_1131_li
#In the MySQL mode, SHOW TABLES didn't work, and meta data tables were not case insensitive. Updatable result sets didn't work as expected. Issue 249.
@changelog_1123_li
@changelog_1132_li
#Connection-created Clob and Blob objects can now be filled using Clob.setCharacterStream(1), Clob.setString(1, s), Blob.setBytes(1, x), Blob.setBinaryStream(1). Issue 235.
@changelog_1124_li
@changelog_1133_li
#Trying to convert a very small CLOB to a BLOB or a very small CLOB to a BLOB threw a NullPointerException.
@changelog_1125_li
@changelog_1134_li
#INFORMATION_SCHEMA.SETTINGS: now the current page count can be queried using select * from information_schema.settings where name = 'info.PAGE_COUNT'.
@changelog_1126_li
@changelog_1135_li
#For an invalid value exception, the parameter name and value was switched in some cases.
@changelog_1127_li
@changelog_1136_li
#When using trace level 3, opening a database no longer prints there is a EOFException (because that is the expected behavior).
@changelog_1128_li
@changelog_1137_li
#CALL calling a Java function with return type ResultSet and return value null threw a ClassCastException.
@changelog_1129_li
@changelog_1138_li
#SELECT ... FROM CSVREAD no longer creates a temporary file. Some large imports are now twice as fast.
@changelog_1130_h2
@changelog_1139_h2
#Version 1.2.145 (2010-11-02)
@changelog_1131_li
@changelog_1140_li
#A new String cache is now created at most once every 5 second, so that out of memory exceptions are not artificially delayed.
@changelog_1132_li
@changelog_1141_li
#After closing a database, the writer thread will stop after 100 ms at the latest (instead of 1 second).
@changelog_1133_li
@changelog_1142_li
#Opening a large database could fail in theory if the process was killed and then not fully compacted (because the unique transaction log key was re-used).
@changelog_1134_li
@changelog_1143_li
#Views now store the schema for Java functions if "functions in schemas" is enabled (system property h2.functionsInSchema).
@changelog_1135_li
@changelog_1144_li
#Improved error message if the LOB files are already deleted on the client side.
@changelog_1136_li
@changelog_1145_li
#Closing a Statement or PreparedStatement at the same time as executing a statement could throw a strange exception. Issue 241.
@changelog_1137_li
@changelog_1146_li
#The Recover tool did not work with compressed lob files (set compress_lob lzf). Also, sometimes the Recover tool was very slow, specially using a 64-bit JVM, because it tried to de-compress lob files even if they were not compressed (which could allocate a lot of memory).
@changelog_1138_li
@changelog_1147_li
#H2 Console: webAllowOthers and webSSL were swapped if they didn't exist in the properties file. Issue 244.
@changelog_1139_li
@changelog_1148_li
#When the system property h2.lobInDatabase is set, CREATE TABLE ... AS SELECT with a LOB column did not always work.
@changelog_1140_li
@changelog_1149_li
#Some system properties are not supported any longer, because they can already be set in the database URL. The constants are: CACHE_SIZE_DEFAULT, CACHE_TYPE_DEFAULT, DEFAULT_LOCK_MODE, LOCK_MODE_READ_COMMITTED, DEFAULT_MAX_LENGTH_INPLACE_LOB, DEFAULT_MAX_LENGTH_INPLACE_LOB2, DEFAULT_MAX_MEMORY_UNDO, DEFAULT_MAX_OPERATION_MEMORY, DEFAULT_PAGE_SIZE, DEFAULT_RESULT_SET_CONCURRENCY, MIN_WRITE_DELAY.
@changelog_1141_li
@changelog_1150_li
#Various system properties have been replaced with database level settings: ALIAS_COLUMN_NAME, ANALYZE_AUTO, ANALYZE_SAMPLE, DATABASE_TO_UPPER, DEFAULT_ESCAPE, DEFRAG_ALWAYS, DROP_RESTRICT, ESTIMATED_FUNCTION_TABLE_ROWS, FUNCTIONS_IN_SCHEMA, LARGE_RESULT_BUFFER_SIZE, LARGE_TRANSACTIONS, MAX_COMPACT_COUNT, MAX_COMPACT_TIME, MAX_MEMORY_ROWS_DISTINCT, MAX_QUERY_TIMEOUT, NESTED_JOINS, OPTIMIZE_DISTINCT, OPTIMIZE_EVALUATABLE_SUBQUERIES, OPTIMIZE_INSERT_FROM_SELECT, OPTIMIZE_IN_LIST, OPTIMIZE_IS_NULL, OPTIMIZE_OR, OPTIMIZE_SUBQUERY_CACHE, OPTIMIZE_TWO_EQUALS, OPTIMIZE_UPDATE, PAGE_STORE_INTERNAL_COUNT, PAGE_STORE_TRIM, QUERY_CACHE_SIZE, RECOMPILE_ALWAYS, RECONNECT_CHECK_DELAY, SELECT_FOR_UPDATE_MVCC, SHARE_LINKED_CONNECTIONS. See the Javadoc documentation of DbSettings for details. The system properties are still supported for backward compatibility.
@changelog_1142_li
@changelog_1151_li
#When the system property h2.nestedJoins was enabled, some outer joins returned the wrong result.
@changelog_1143_li
@changelog_1152_li
#Opening a database could throw a NullPointerException.
@changelog_1144_li
@changelog_1153_li
#After a crash, the database file did not always shrink because old transaction log pages were not removed from the file.
@changelog_1145_li
@changelog_1154_li
#Various CallableStatement methods could throw a NullPointerException.
@changelog_1146_li
@changelog_1155_li
#LOB files were not deleted when running DROP ALL OBJECTS.
@changelog_1147_li
@changelog_1156_li
#MS SQL Server compatibility: support "N" in front of string literals ("National Language" strings). Issue 240.
@changelog_1148_li
@changelog_1157_li
#CAST: when converting a string to binary, it is hex encoded (every byte two characters); a hex string can be converted to a number by first converting it to binary. Examples: CAST(CAST('FFFF' AS BINARY) AS INT) = 65535, CAST(65535 AS BINARY) = '0000FFFF'.
@changelog_1149_li
@changelog_1158_li
#When a domain (user defined data type) contained a user defined function, the database could not be opened.
@changelog_1150_li
@changelog_1159_li
#CAST('011' AS INT) will no longer use decode the value as an octal number (using Integer.decode) but now use Integer.parseInt. The same logic applied to byte, short, and long. This also means that trying to convert hex numbers (0x...) with CAST now fails.
@changelog_1151_li
@changelog_1160_li
#A table in the Recover tool script could not be imported if the script contained duplicate keys.
@changelog_1152_h2
@changelog_1161_h2
#Version 1.2.144 (2010-10-15)
@changelog_1153_li
@changelog_1162_li
#The Windows .bat files did not contain CR+LF.
@changelog_1154_li
@changelog_1163_li
#The LOB storage (when the system property h2.lobInDatabase is set) is now only initialized when needed.
@changelog_1155_li
@changelog_1164_li
#The index condition columnName IS NULL was not efficient when using a clustered index.
@changelog_1156_li
@changelog_1165_li
#The Recover tool did not work for databases larger than 2 GB.
@changelog_1157_li
@changelog_1166_li
#In memory database: outer joins with a condition "column is null" could return the wrong result.
@changelog_1158_li
@changelog_1167_li
#Temporary files were not created in the temporary directory of the system, but in the current working directory. This affected temporary undo log files for read-only databases, temporary files for large result sets when using read-only databases, and temporary LOB files when storing LOBs in the database (system property h2.lobInDatabase). When the setting h2.lobInDatabase is not set, temporary LOB files are still stored in a sub-directory (.lobs.db/) of the current working directory.
@changelog_1159_li
@changelog_1168_li
#New experimental feature to speed up CREATE TABLE ... AS SELECT. To enable the feature, set the system property h2.optimizeInsertFromSelect to true. For large queries, performance can be doubled.
@changelog_1160_li
@changelog_1169_li
#When LOB objects are stored in the database (using the experimental setting h2.lobInDatabase), and using the MVCC mode, opening a database with uncommitted transactions could throw a NullPointerException.
@changelog_1161_li
@changelog_1170_li
#Support of stored procedures with OUT parameters in CallableStatement is implemented.
@changelog_1162_li
@changelog_1171_li
#PreparedStatement.getMetaData() was not always consistent with resulting ResultSet.getMetaData().
@changelog_1163_li
@changelog_1172_li
#The build tool now uses JAVA_HOME for javac as well. Issue 233.
@changelog_1164_li
@changelog_1173_li
#Opening and closing encrypted databases is now much faster.
@changelog_1165_li
@changelog_1174_li
#H2 Console: new experimental feature to support file download and upload, but only if there is a directory called "transfer" in the current working directory. For security reasons, only very simple file names are supported. Sub-directories are not supported. To upload, use transfer.jsp; to download, use transfer/fileName.
@changelog_1166_li
@changelog_1175_li
#A new sample application that shows how to manually create an encrypted and compressed script file.
@changelog_1167_li
@changelog_1176_li
#Performance has been improved a bit.
@changelog_1168_li
@changelog_1177_li
#DatabaseMetaData.getJDBCMajorVersion now returns 4 (instead of 3) when the driver is compiled with Java 6 (the default).
@changelog_1169_li
@changelog_1178_li
#Re-added the internal utility class BitField which improves performance of opening and closing a database (because it supports setByte / getByte, unlike java.util.BitSet).
@changelog_1170_li
@changelog_1179_li
#INFORMATION_SCHEMA.SESSIONS: the start time of a SQL statement is no longer set in each case. It is only set for long running statements. This change should improve performance a bit on some devices, specially when using Android.
@changelog_1171_li
@changelog_1180_li
#A old databases without user name and password (created with H2 version 1.2.142 or older) couldn't be opened with version 1.2.143. Fixed.
@changelog_1172_li
@changelog_1181_li
#The database upgrade classes have been renamed.
@changelog_1173_li
@changelog_1182_li
#The database did not automatically upgrade when using a connection pool or data source.
@changelog_1174_li
@changelog_1183_li
#JaQu: a database object can now also be created using a DataSource. Issue 227.
@changelog_1175_li
@changelog_1184_li
#The built-in profiler now better supports the Dalvik VM.
@changelog_1176_li
@changelog_1185_li
#The jarSmall build target no longer includes assertions (SysProperties.CHECK, CHECK2, system properties h2.check and h2.check2).
@changelog_1177_li
@changelog_1186_li
#The jarSmall build target excluded the DbUpgrade classes by mistake.
@changelog_1178_h2
@changelog_1187_h2
#Version 1.2.143 (2010-09-18)
@changelog_1179_li
@changelog_1188_li
#If the user name and password are not set or empty, then the password is not hashed. To disable this behavior, set the system property h2.emptyPassword to false. TCP server: the default user name for the management database is now an empty string.
@changelog_1180_li
@changelog_1189_li
#Cluster: auto-commit was disabled after opening a connection.
@changelog_1181_li
@changelog_1190_li
#Connection.getAutoCommit() is now much faster, specially when using the server mode.
@changelog_1182_li
@changelog_1191_li
#Statement.cancel() had no effect when using the server mode.
@changelog_1183_li
@changelog_1192_li
#SCRIPT: the SQL script no longer contains settings that match the default value.
@changelog_1184_li
@changelog_1193_li
#Statement.cancel() did not work when running RUNSCRIPT and SCRIPT.
@changelog_1185_li
@changelog_1194_li
#Statement.cancel() could cause a NullPointerException.
@changelog_1186_li
@changelog_1195_li
#In some cases (specially when using a small cache size or a large database over 1 GB) for some operations like ALTER TABLE the data was written before the transaction log entries, which could cause a corrupt database if the process was killed during the ALTER TABLE operation. Thanks a lot to Victor Pyankov for helping solve this problem!
@changelog_1187_li
@changelog_1196_li
#The Recover tool could throw a ArrayIndexOutOfBoundsException when trying to recover a corrupt database file.
@changelog_1188_li
@changelog_1197_li
#The SCRIPT command and tool now uses the default file encoding for the system now instead of UTF-8 (as before). In most cases, this will not affect existing applications, as the encoding only affects how SQL identifiers (table names and so on) that contain special characters are stored. Table data is escaped, and therefore is no problem.
@changelog_1189_li
@changelog_1198_li
#The SCRIPT command and tool now also support the CHARSET option (like RUNSCRIPT).
@changelog_1190_li
@changelog_1199_li
#When closing a database, sometimes empty space in the database was not freed up.
@changelog_1191_li
@changelog_1200_li
#Trying to create a view with parameters in the query will now throw an exception. So far, creating the view was allowed, but the parameter value was not used (null was used instead).
@changelog_1192_li
@changelog_1201_li
#New experimental feature SHUTDOWN DEFRAG. This option re-orders the pages while closing the database so that table scans are faster.
@changelog_1193_li
@changelog_1202_li
#When using the MULTI_THREADED option, concurrently reading from a database (specially from a larger database, or when using a small cache size) could throw an exception.
@changelog_1194_li
@changelog_1203_li
#When adding a comment to a column that has a check constraint, the database couldn't be re-opened.
@changelog_1195_li
@changelog_1204_li
#New system property h2.lobClientMaxSizeMemory to set the maximum size of a LOB object to keep in memory on the client side when using the server mode.
@changelog_1196_h2
@changelog_1205_h2
#Version 1.2.142 (2010-08-31)
@changelog_1197_li
@changelog_1206_li
#Documentation for using H2 on Android devices has been added under Tutorial - Android.
@changelog_1198_li
@changelog_1207_li
#An ArrayIndexOutOfBoundsException was thrown when querying the table information_schema.function_aliases while there are any user defined aggregate functions.
@changelog_1199_li
@changelog_1208_li
#The jar files are now about 50 KB smaller. In the last few versions they contained superfluous classes.
@changelog_1200_li
@changelog_1209_li
#The default time to compact a database when closing (system property h2.maxCompactTime) is now 0.2 seconds instead of 1 second.
@changelog_1201_li
@changelog_1210_li
#Opening an closing a database is now faster.
@changelog_1202_li
@changelog_1211_li
#In theory, when using indexes with large index rows (or when using a very small page size), removing rows could throw an internal exception in some cases.
@changelog_1203_li
@changelog_1212_li
#Inserting rows in reverse order could throw an ArrayIndexOutOfBoundsException in some cases (specially rows larger than the page size, which is 2 KB by default). Issue 226.
@changelog_1204_li
@changelog_1213_li
#H2 Console: with Chrome and Safari, resizing the table/query frame doesn't work. Issue 225.
@changelog_1205_li
@changelog_1214_li
#New experimental database file locking mechanism "FS" to use native file locking (no *.lock.db file is created in this case, and no background thread is started). This mechanism may not work on all systems (on some systems it's possible to lock the same file multiple times within the same virtual machine, and on some system native file locking is not working or unlocking is not working).
@changelog_1206_h2
@changelog_1215_h2
#Version 1.2.141 (2010-08-22)
@changelog_1207_li
@changelog_1216_li
#New experimental pseudo-encryption algorithm "FOG". It makes the data appear to be encrypted. This algorithm is cryptographically extremely weak, and should only be used to hide data from reading the plain text using a text editor. Please let us know if you think this is useful or not.
@changelog_1208_li
@changelog_1217_li
#Documentation: the grammar and function documentation can now be easier translated.
@changelog_1209_li
@changelog_1218_li
#Password hash: in addition to connecting with the plain text password, H2 now supports connecting with the password hash. Like this you don't have to store plain text passwords in config files. For details, see the documentation at Advanced / Password Hash.
@changelog_1210_li
@changelog_1219_li
#Lucene 3.x support was added in the source code, however it is not yet enabled by default and is not yet supported when using the default h2 jar file. To enable Lucene 3.x support, the source code of H2 needs to be switched using <code>./build.sh -Dlucene=3 switchSource</code>, and then re-compile. To switch the source code back use <code>./build.sh -Dlucene=2 switchSource</code> (replace ./build.sh with build.bat on Windows). The plan is to use Lucene 3 by default in H2 version 1.3.x. Issue 147.
@changelog_1211_li
@changelog_1220_li
#The native fulltext search could cause a Java level deadlock if searching from multiple connections concurrently.
@changelog_1212_li
@changelog_1221_li
#CREATE FORCE VIEW didn't work in most cases if a referenced table didn't exist.
@changelog_1213_li
@changelog_1222_li
#MVCC: when trying to insert two rows with the same key from two connections, the second connection immediately threw the exception "Unique index or primary key violation". Instead, the second connection now waits throwing the exception until the first connection committed the change (same as when trying to concurrently update the same row).
@changelog_1214_li
@changelog_1223_li
#Server mode: if the client ran with a different timezone setting than the server, date values got shifted by the difference between the timezones. This problem affected the data types DATE, TIME, and TIMESTAMP, when using PreparedStatement.setDate / setTime / setTimestamp and ResultSet.getDate / getTime / getTimestamp. To solve the problem, both the client and the server need to be updated (otherwise the old transfer protocol is used).
@changelog_1215_li
@changelog_1224_li
#The built-in connection pool (JdbcConnectionPool) did not always honor the login timeout (the timeout could occur much too early). Thanks a lot to Dario Fassi for the patch!
@changelog_1216_li
@changelog_1225_li
#Translation: the new messages have been translated to Spanish. Thanks a lot to Dario Fassi!
@changelog_1217_li
@changelog_1226_li
#The table INFORMATION_SCHEMA.SETTINGS now contains all H2-specific system properties (the ones that start with "h2.") and that are explicitly set. Previously, some H2-specific settings (for example h2.analyzeAuto) were missing in this list.
@changelog_1218_li
@changelog_1227_li
#EXPLAIN ANALYZE with an in-memory database threw an exception. Issue 216.
@changelog_1219_li
@changelog_1228_li
#Data modifications (inserts, updates, and deletes) are now up to 5 times faster because converting objects to byte arrays is avoided if possible.
@changelog_1220_li
@changelog_1229_li
#LOG=0 is now a bit faster (previously undo log entries were still written).
@changelog_1221_li
@changelog_1230_li
#The command line tools now say so if the source directory of an option doesn't exist.
@changelog_1222_li
@changelog_1231_li
#It is now allowed to truncate a table if referential integrity has been disabled for this table or database.
@changelog_1223_li
@changelog_1232_li
#For unencrypted databases, the automatic upgrade temporary script file is now unencrypted again.
@changelog_1224_h2
@changelog_1233_h2
#Version 1.2.140 (2010-07-25)
@changelog_1225_li
@changelog_1234_li
#The default MAX_LOG_SIZE is now 16 MB instead of 2 MB. Some uses cases are 3 times faster now.
@changelog_1226_li
@changelog_1235_li
#Improved cache memory usage calculation.
@changelog_1227_li
@changelog_1236_li
#Only resources that are actually used are loaded in memory. This can reduce the memory usage by about 400 KB.
@changelog_1228_li
@changelog_1237_li
#Profiling: the jar file can now be installed as an agent using java -javaagent:h2*.jar - this was be used to more accurately calculate the memory footprint of the cache. It has no effect when using H2 (using this feature in an application is not needed and not recommended).
@changelog_1229_li
@changelog_1238_li
#The cache was not used efficiently when reading (behaving like a FIFO cache instead of an LRU cache).
@changelog_1230_li
@changelog_1239_li
#Storing lobs in the database has been changed. It is now faster. Unfortunately, the change is not backward compatible; if you have used h2.lobInDatabase before you will need to re-build the database.
@changelog_1231_li
@changelog_1240_li
#SHUTDOWN COMPACT is now faster.
@changelog_1232_li
@changelog_1241_li
#H2 Console: requesting the status did not always show the window on top of others.
@changelog_1233_li
@changelog_1242_li
#H2 Console: on some system, the browser windows got opened when requesting a new one.
@changelog_1234_li
@changelog_1243_li
#The built-in profiling tool now uses a default stack depth of 32 elements and a default interval of 10 ms.
@changelog_1235_li
@changelog_1244_li
#Database files now grows in 1 MB blocks (and at least 20% at a time), instead of always 256 KB. This speeds up loading a new database.
@changelog_1236_li
@changelog_1245_li
#H2 Console: new built-in command @sleep to help profile another session.
@changelog_1237_li
@changelog_1246_li
#For improved performance, LOG=0 and LOG=1 are again supported. LOG=0 means the transaction log is disabled completely (fastest; for loading a database). LOG=1 means the transaction log is enabled, but FileDescriptor.sync is disabled (if no protection against power failure is required). LOG=2 is the default (transaction log is enabled, FileDescriptor.sync for each checkpoint).
@changelog_1238_li
@changelog_1247_li
#After deleting a lot of data (for example by dropping or altering tables, or indexes, or after a large transaction), opening a large database was very slow. Fixed.
@changelog_1239_li
@changelog_1248_li
#When killing the process after creating and dropping many tables (specially temporary tables), the database could not be opened sometimes.
@changelog_1240_li
@changelog_1249_li
#CAST(NULL AS ...) doesn't forget the data type, precision, and scale any longer.
@changelog_1241_li
@changelog_1250_li
#Experimental support for recursive queries (see 'Advanced' - 'Recursive Queries' for details).
@changelog_1242_li
@changelog_1251_li
#Problems with JDK 1.6.0_18 have been reports in the class StringUtils.quoteRemarkSQL. This method is now changed.
@changelog_1243_li
@changelog_1252_li
#The "small jar" distribution did not include the CompressTool, which was required for some operations. Fixed.
@changelog_1244_li
@changelog_1253_li
#The build tool now supports (minimalistic) shell mode, started using ./build.sh -
@changelog_1245_li
@changelog_1254_li
#IS NULL comparison with nested queries and linked tables did not work. Example: select * from (select x from test) where x is null.
@changelog_1246_li
@changelog_1255_li
#Support for null-safe equals. This includes the ANSI SQL standard syntax A IS [NOT] DISTINCT FROM B as well as the shorter A IS [NOT] B.
@changelog_1247_li
@changelog_1256_li
#Primary key violations threw a strange exception message when using a single column INT or BIGINT key.
@changelog_1248_li
@changelog_1257_li
#EXPLAIN ANALYZE now also lists the number of pages read from the file.
@changelog_1249_li
@changelog_1258_li
#Memory mapped files: There was a bug in version 1.2.139 so that memory mapped files could only be used together with split, for example: split:nioMapped: - the problem is now solved. It is still a good idea to use split:nioMapped: to work around the 2 GB limitation of memory mapped files.
@changelog_1250_li
@changelog_1259_li
#Memory mapped files: the system property h2.nioCleanerHack is now disabled by default because it was not always working as expected. Now System.gc() is used in a loop until the buffer is garbage collected. This of course is also not a nice solution, but the only one known to work. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038
@changelog_1251_li
@changelog_1260_li
#Bugfixes for the automatic 1.1 db migration.
@changelog_1252_li
@changelog_1261_li
#If an old 1.1 database file version is found on connect, it is now possible to let the old h2 classes (v 1.2.128) connect to the database. The automatic upgrade .jar file must be present, and the url must contain NO_UPGRADE=TRUE
@changelog_1253_li
@changelog_1262_li
#The automatic upgrade temporary script file is now encrypted.
@changelog_1254_h2
@changelog_1263_h2
#Version 1.2.139 (2010-07-10)
@changelog_1255_li
@changelog_1264_li
#There was a bug in the internal IntIntHashMap. There were no known side effects however.
@changelog_1256_li
@changelog_1265_li
#ANALYZE now uses less memory.
@changelog_1257_li
@changelog_1266_li
#Memory mapped file system: improved error messages if there is a problem.
@changelog_1258_li
@changelog_1267_li
#The Lucene fulltext search did not work well when using special file systems such as split or nioMapped.
@changelog_1259_li
@changelog_1268_li
#The memory mapped file system (nioMapped: file prefix) couldn't seek past the file length.
@changelog_1260_li
@changelog_1269_li
#Some file system operations did not work with stacked file systems (for example split and nioMapped). This also affected the DeleteDbFiles tool.
@changelog_1261_li
@changelog_1270_li
#New experimental query cache. The cache is only used if the SQL statement and all parameters match. Each session has it's own cache with the given size. Only the last returned result per query is cached. Only SELECT statements are cached (excluding UNION and FOR UPDATE statements). This works for both statements and prepared statement. To enable, set the system property h2.commandCacheSize to a value larger than 0. There is currently no plan to enable this option by default in future versions.
@changelog_1262_li
@changelog_1271_li
#Conditions with many OR operations could throw an UnsupportedOperationException if h2.optimizeOr was enabled.
@changelog_1263_li
@changelog_1272_li
#XA connection: after transaction commit or rollback, the physical connection is set into autocommit mode.
@changelog_1264_li
@changelog_1273_li
#MULTI_THREADED did not work correctly and could throw the exception "try to add a record twice" for larger databases because cache access was not correctly synchronized.
@changelog_1265_li
@changelog_1274_li
#Automatic database upgrade from non page store is now possible. If the classes from the h2mig_pagestore_addon.jar file are in the classpath, the database will be converted to the current page store format automatically. The file can be found here: <a href="http://h2database.com/h2mig_pagestore_addon.jar">http://h2database.com/h2mig_pagestore_addon.jar</a>
@changelog_1266_li
@changelog_1275_li
#The MultiDimension tools was extended with a few helper methods. The API was unified a bit.
@changelog_1267_li
@changelog_1276_li
#ODBC: MS Access could not link to a table with unique index or primary key. To solve this problem, index meta data is currently disabled for ODBC. When using the new H2 version to access a database over ODBC, the PostgreSQL catalog is automatically upgraded. Using a database with an upgraded PostgreSQL catalog with an older version of H2 is still possible, but not over ODBC.
@changelog_1268_li
@changelog_1277_li
#ODBC: MS Access could not link to a table with a name containing '_'.
@changelog_1269_li
@changelog_1278_li
#ODBC: additional connection settings can now be added to the database name. Example: ~/test;cipher=xtea. Therefore, encrypted databases are supported.
@changelog_1270_li
@changelog_1279_li
#Local temporary tables can now be created without having to commit a transaction using CREATE LOCAL TEMPORARY TABLE TEMP(ID INT PRIMARY KEY) TRANSACTIONAL.
@changelog_1271_li
@changelog_1280_li
#New system property h2.dropRestrict (default false) to change the default action for DROP TABLE and DROP VIEW (false for CASCADE, true for RESTRICT). The plan is to enable this property by default in version 1.3.x.
@changelog_1272_li
@changelog_1281_li
#DROP TABLE now also supports CASCADE (still the default) and RESTRICT.
@changelog_1273_li
@changelog_1282_li
#The wrong exception was thrown when trying to connect to a server if the server was not running.
@changelog_1274_li
@changelog_1283_li
#UNION queries where the first query contains a nested query were parsed incorrectly. Example: "select 1 from (select 2 from dual) union select 3 from dual" was parsed as "select 1 from ((select 2 from dual) union select 3 from dual)". Fixed.
@changelog_1275_li
@changelog_1284_li
#Support ALTER SCHEMA name RENAME TO newName (rename schema). (patch from Kerry Sainsbury)
@changelog_1276_h2
@changelog_1285_h2
#Version 1.2.138 (2010-06-27)
@changelog_1277_li
@changelog_1286_li
#Referential integrity: it was not allowed to delete a row with NULL in the parent table, if there was a row with NULL in the child table.
@changelog_1278_li
@changelog_1287_li
#Experimental feature to support case sensitive catalog names and database names using the DATABASE() method. To use this feature, set the system property h2.databaseToUpper to false. The plan is to set the property to false by default in version 1.3.x. Issue 204 - thanks to Sylvain Cuaz (ILM Informatique) for the patch.
@changelog_1279_li
@changelog_1288_li
#Experimental feature to support nested joins. To enable, set the system property h2.nestedJoins to true. If enabled, nested joins and right outer joins should work as expected (issues 145, 177, and 203). The plan is to enable this feature by default in version 1.3.x.
#When creating functions within a schema, those functions could not be used in views, nested queries, and constraints. Fixed.
@changelog_1282_li
@changelog_1291_li
#The benchmarks have been run using recent database versions.
@changelog_1283_li
@changelog_1292_li
#Version 1.2.137 could still not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision).
@changelog_1284_li
@changelog_1293_li
#Cluster: non-admin users could not connect when one of the cluster node was stopped. Issue 206.
@changelog_1285_li
@changelog_1294_li
#DROP VIEW now supports the CASCADE and RESTRICT clauses (patch from Kerry Sainsbury)
@changelog_1286_li
@changelog_1295_li
#CREATE VIEW now supports the OR REPLACE clause (patch from Kerry Sainsbury)
@changelog_1287_li
@changelog_1296_li
#Build tool: ability to only run one test using the -Dtest=className setting. eg: build -Dtest=org.h2.test.db.TestViewDropView test (patch from Kerry Sainsbury).
@changelog_1288_h2
@changelog_1297_h2
#Version 1.2.137 (2010-06-06)
@changelog_1289_li
@changelog_1298_li
#Statements with a nested query and a condition that was always NULL threw an IndexOutOfBoundsException. Example: select * from (select null as x) where x=1
@changelog_1290_li
@changelog_1299_li
#The changes that were made to support large transactions also fixed a bug with large transactions (when the undo log file size is larger than 2 GB).
@changelog_1291_li
@changelog_1300_li
#Experimental feature to support very large transactions (except when using MVCC). To enable, set the system property h2.largeTransactions to true. If enabled, changes to tables without a primary key can be buffered to disk. The plan is to enable this feature by default in version 1.3.x.
@changelog_1292_li
@changelog_1301_li
#H2 Console: editing result sets is now also working for database other than H2, if they do support updatable result sets. Add "@edit" before the query. Only limited testing has been done on this feature, some data types may not work (please provide feedback if you find issues).
@changelog_1293_li
@changelog_1302_li
#Cluster: an open transaction was committed when a cluster node was stopped (because disabling the cluster executes SET CLUSTER '', which committed the transaction). Transaction are no longer committed when calling SET CLUSTER. Issue 199.
@changelog_1294_li
@changelog_1303_li
#Cluster: non-admin users couldn't connect to the cluster and couldn't disable the cluster. Issue 201.
@changelog_1295_li
@changelog_1304_li
#Cluster: NEXTVAL('sequence') was only called on one cluster node, therefore sequence values could get out of sync.
@changelog_1296_li
@changelog_1305_li
#Version 1.2.136 could not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision). A workaround has been implemented.
@changelog_1297_li
@changelog_1306_li
#The error code of IO exceptions in CSV functions was incorrect.
@changelog_1298_li
@changelog_1307_li
#The TriggerPassData example now uses a prefix (the database name).
@changelog_1299_li
@changelog_1308_li
#The wrong exception was thrown when trying to reference a table that doesn't support references such as a table in the information schema.
@changelog_1300_li
@changelog_1309_li
#Server.shutdownTcpServer can now stop all TCP servers on this JVM.
@changelog_1301_li
@changelog_1310_li
#JdbcConnectionPool: the default connection timeout is now 30 seconds (it used to be 5 minutes).
@changelog_1302_li
@changelog_1311_li
#LOB storage: LOBs added with "h2.lobInDatabase" enabled couldn't be read later with this option disabled.
@changelog_1303_h2
@changelog_1312_h2
#Version 1.2.136 (2010-05-24)
@changelog_1304_li
@changelog_1313_li
#When using ORDER BY and there are both ascending and descending indexes, the database used the first index even when the second one could be used for sorting.
@changelog_1305_li
@changelog_1314_li
#Conditions of the form columnName IS NULL now use an index. To disable this feature, set the system property h2.optimizeIsNull to false.
@changelog_1306_li
@changelog_1315_li
#H2 Console: when the settings were not stored yet (for example when running for the first time), the last recently used settings were not stored. A workaround was to create the file ".h2.server.properties" manually in the current user home directory, with the contents: webAllowOthers=false, webPort=8082, webSSL=false, 0=Generic H2 (Embedded)|org.h2.Driver|jdbc\:h2\:~/test|sa (where a comma is a newline).
@changelog_1307_li
@changelog_1316_li
#The source code is now switched to Java 6 (JDK 1.6) by default. Java 5 (JDK 1.5) is still supported, and the jar file is still compiled for Java 5.
@changelog_1308_li
@changelog_1317_li
#The BOM (the byte-order-mark) character 0xfeff at the beginning of the file is ignored. This is for compatibility with Microsoft Excel.
@changelog_1309_li
@changelog_1318_li
#When opening an existing database, the cache size is set to at most half the amount of memory available for the virtual machine (Runtime.getRuntime().maxMemory()), even if the cache size setting stored in the database is larger. Setting the cache size in the database URL or explicitly using SET CACHE_SIZE overrides this value (even if larger than the physical memory).
@changelog_1310_li
@changelog_1319_li
#INFORMATION_SCHEMA.SETTINGS: the cache size is now returned in KB.
@changelog_1311_li
@changelog_1320_li
#New system property h2.selectForUpdateMvcc, the default is false (the feature is disabled). When enabled, SELECT ... FOR UPDATE only locks the selected rows in the MVCC mode. Aggregate or GROUP BY queries are not allowed in this case.
@changelog_1312_li
@changelog_1321_li
#Profiler: improved message if there was no stack trace.
@changelog_1313_li
@changelog_1322_li
#The H2 Console can now be used within another application, in a frame or iframe. Issue 197.
@changelog_1314_li
@changelog_1323_li
#Recover tool: the statistics section now includes page type counts again.
@changelog_1315_li
@changelog_1324_li
#Queries with multiple IN(...) conditions sometimes return the wrong results when there was a multi-column index for the column.
@changelog_1316_li
@changelog_1325_li
#Queries with IN(..., NULL) did sometimes return the wrong results when there was a index for the column.
@changelog_1317_li
@changelog_1326_li
#DECIMAL: faster precision and memory usage calculations.
@changelog_1318_li
@changelog_1327_li
#A new class org.h2.tools.TriggerAdapter allows to use the ResultSet interface within trigger implementations.
@changelog_1319_li
@changelog_1328_li
#A subselect which used an index could lead to wrong results. Fixed.
@changelog_1320_li
@changelog_1329_li
#Creating a cached temporary non persistent table with a primary key threw a NullPointerException.
@changelog_1321_h2
@changelog_1330_h2
#Version 1.2.135 (2010-05-08)
@changelog_1322_li
@changelog_1331_li
#Temporary files were not deleted when using large transactions, disabling autocommit, and closing the session without committing.
@changelog_1323_li
@changelog_1332_li
#Queries using multiple IN(..) conditions on the same table could cause repeated rows in the result set.
@changelog_1324_li
@changelog_1333_li
#Translation: Lubomir Grajciar translated the H2 Console as well as all error message to Slovensky. Thanks a lot!
@changelog_1325_li
@changelog_1334_li
#There was a possible Java level deadlock when opening an uninitialized database and using a file system that also opened a database.
@changelog_1326_li
@changelog_1335_li
#When killing the process while the database was writing a checkpoint, while it was closing, or while running recovery (while removing temporary tables from a previous run), the database could become corrupt. A new test case has been implemented to ensure such problems can not occur in the future.
@changelog_1327_li
@changelog_1336_li
#File system: new method FileSystem.setReadOnly.
@changelog_1328_li
@changelog_1337_li
#The page size for new databases can now be set in the database URL using ;PAGE_SIZE=512. Currently this feature is only used to simplify testing.
@changelog_1329_li
@changelog_1338_li
#New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1330_li
@changelog_1339_li
#Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1331_li
@changelog_1340_li
#Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1332_li
@changelog_1341_li
#Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1333_li
@changelog_1342_li
#Auto-reconnect: if another connection uses the database in exclusive mode then this connection will try to re-connect until the exclusive mode ends. This is important when using the cluster mode.
@changelog_1334_li
@changelog_1343_li
#SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1335_li
@changelog_1344_li
#Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1336_li
@changelog_1345_li
#Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1337_li
@changelog_1346_li
#The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1338_li
@changelog_1347_li
#The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1339_li
@changelog_1348_li
#The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1340_li
@changelog_1349_li
#Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1341_li
@changelog_1350_li
#Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1342_li
@changelog_1351_li
#The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1343_li
@changelog_1352_li
#When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1344_li
@changelog_1353_li
#Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1345_li
@changelog_1354_li
#UNIQUE was not listed as a keyword.
@changelog_1346_li
@changelog_1355_li
#Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1347_li
@changelog_1356_li
#For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1348_li
@changelog_1357_li
#The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1349_li
@changelog_1358_li
#If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1350_li
@changelog_1359_li
#New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1351_li
@changelog_1360_li
#INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1352_h2
@changelog_1361_h2
#Version 1.2.134 (2010-04-23)
@changelog_1353_li
@changelog_1362_li
#New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1354_li
@changelog_1363_li
#JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1355_li
@changelog_1364_li
#MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1356_li
@changelog_1365_li
#MERGE did not respect foreign key and check constraints.
@changelog_1357_li
@changelog_1366_li
#ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1358_li
@changelog_1367_li
#When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1359_li
@changelog_1368_li
#Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1360_li
@changelog_1369_li
#H2 Console: the built-in commands are now documented.
@changelog_1361_li
@changelog_1370_li
#REPLACE: if any parameter is null, the result is null.
@changelog_1362_li
@changelog_1371_li
#Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1363_li
@changelog_1372_li
#The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1364_li
@changelog_1373_li
#H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1365_li
@changelog_1374_li
#The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1366_li
@changelog_1375_li
#The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1367_li
@changelog_1376_li
#Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1368_li
@changelog_1377_li
#If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1369_h2
@changelog_1378_h2
#Version 1.2.133 (2010-04-10)
@changelog_1370_li
@changelog_1379_li
#A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1371_li
@changelog_1380_li
#The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1372_li
@changelog_1381_li
#The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1373_li
@changelog_1382_li
#Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1374_li
@changelog_1383_li
#The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1375_li
@changelog_1384_li
#New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1376_li
@changelog_1385_li
#ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1377_li
@changelog_1386_li
#Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1378_li
@changelog_1387_li
#Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1379_li
@changelog_1388_li
#When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1380_li
@changelog_1389_li
#Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1381_li
@changelog_1390_li
#H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1382_li
@changelog_1391_li
#H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1383_h2
@changelog_1392_h2
#Version 1.2.132 (2010-03-21)
@changelog_1384_li
@changelog_1393_li
#The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1385_li
@changelog_1394_li
#User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1386_li
@changelog_1395_li
#Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1387_li
@changelog_1396_li
#When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1388_li
@changelog_1397_li
#The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1389_li
@changelog_1398_li
#Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1390_li
@changelog_1399_li
#When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1391_li
@changelog_1400_li
#The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1392_li
@changelog_1401_li
#CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1393_li
@changelog_1402_li
#Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1394_li
@changelog_1403_li
#The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1395_li
@changelog_1404_li
#When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1396_li
@changelog_1405_li
#Literals of type BIGINT now have the correct data type.
@changelog_1397_h2
@changelog_1406_h2
#Version 1.2.131 (2010-03-05)
@changelog_1398_li
@changelog_1407_li
#Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1399_li
@changelog_1408_li
#In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1400_li
@changelog_1409_li
#After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1401_li
@changelog_1410_li
#An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1402_h2
@changelog_1411_h2
#Version 1.2.130 (2010-02-26)
@changelog_1403_li
@changelog_1412_li
#EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1404_li
@changelog_1413_li
#IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1405_li
@changelog_1414_li
#IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1406_li
@changelog_1415_li
#For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1407_li
@changelog_1416_li
#PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1408_li
@changelog_1417_li
#A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1409_li
@changelog_1418_li
#When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1410_li
@changelog_1419_li
#Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1411_li
@changelog_1420_li
#The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1412_li
@changelog_1421_li
#Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1413_li
@changelog_1422_li
#Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1414_h2
@changelog_1423_h2
#Version 1.2.129 (2010-02-19)
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#The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
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#CREATE ALIAS: error message when compiling Java code have been improved.
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#MVCC: creating a table with an incorrect constraint could cause strange errors.
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@changelog_1427_li
#Hash indexes now are only used for single column indexes.
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@changelog_1428_li
#The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
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@changelog_1429_li
#The file system abstraction no longer throws SQL exceptions.
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@changelog_1430_li
#DatabaseEventListener.diskSpaceIsLow has changed.
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@changelog_1431_li
#The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
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@changelog_1432_li
#SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
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@changelog_1433_li
#When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
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@changelog_1434_li
#The BNF parser now uses the visitor pattern.
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@changelog_1435_li
#Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
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@changelog_1436_li
#The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
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@changelog_1437_li
#H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
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@changelog_1438_li
#A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
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@changelog_1439_li
#The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
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@changelog_1440_li
#Tools: the method run(String... args) has been renamed to runTool(String... args).
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#Server.startWebServer(Connection) was not working as expected.
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@changelog_1442_li
#The database URL option ACCESS_MODE_LOG is no longer supported.
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#The database URL option RECOVER has currently no effect.
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@changelog_1444_li
#Converting an old (non-page store) database is no longer supported using this version.
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@changelog_1445_li
#The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
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@changelog_1446_li
#The setting LOG has currently no effect (it only had an effect when the page store was disabled).
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@changelog_1447_li
#Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
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#The translated resources are now stored in UTF-8 format.
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#The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1441_h2
@changelog_1450_h2
#Version 1.2.128 (2010-01-30)
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#There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
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@changelog_1452_li
#The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
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#Automatic conversion of old databases to the page store format failed if the database contained LOB files.
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#Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
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@changelog_1455_li
#If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
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#Less classes are loaded when using the database in embedded mode.
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@changelog_1457_li
#The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
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@changelog_1458_li
#Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
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#Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
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#Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
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#Documentation: the javadocs for Csv.write and read used the wrong default charset.
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#MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
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#If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
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#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
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#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
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#Slightly improved performance if the table is already locked.
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#CompressLZF: faster decompression.
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#PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
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#Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@cheatSheet_1000_h1
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@@ -10393,16 +10420,19 @@ H2 コンソール アプリケーション
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#Compatibility with MySQL: support CREATE TABLE TEST(NAME VARCHAR(255) CHARACTER SET UTF8).
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@roadmap_1495_li
#CALL is incompatible with other databases because it returns a result set, so that CallableStatement.execute() returns true.
@roadmap_1496_h2
#Not Planned
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#HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
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@roadmap_1498_li
#String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
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@roadmap_1499_li
#In prepared statements, identifier names (table names and so on) can not be parameterized. Adding such a feature would complicate the source code without providing reasonable speedup, and would slow down regular prepared statements.
