@@ -1406,1036 +1406,976 @@ Next Version (unreleased)
-
@changelog_1003_h2
Version 1.2.130 (2010-02-26)
Version 1.2.131 (2010-03-05)
@changelog_1004_li
EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
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_1005_li
IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
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_1006_li
IN(..): the index was not used if there were multiple IN(..) conditions.
After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1007_li
An IndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1008_h2
Version 1.2.130 (2010-02-26)
@changelog_1009_li
EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1010_li
IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1011_li
IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1012_li
For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1008_li
@changelog_1013_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_1009_li
@changelog_1014_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_1010_li
@changelog_1015_li
When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1011_li
@changelog_1016_li
Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1012_li
@changelog_1017_li
The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1013_li
@changelog_1018_li
Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1014_li
@changelog_1019_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_1015_h2
@changelog_1020_h2
Version 1.2.129 (2010-02-19)
@changelog_1016_li
@changelog_1021_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_1017_li
@changelog_1022_li
CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1018_li
@changelog_1023_li
MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1019_li
@changelog_1024_li
Hash indexes now are only used for single column indexes.
@changelog_1020_li
@changelog_1025_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_1021_li
@changelog_1026_li
The file system abstraction no longer throws SQL exceptions.
@changelog_1022_li
@changelog_1027_li
DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1023_li
@changelog_1028_li
The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1024_li
@changelog_1029_li
SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1025_li
@changelog_1030_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_1026_li
@changelog_1031_li
The BNF parser now uses the visitor pattern.
@changelog_1027_li
@changelog_1032_li
Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1028_li
@changelog_1033_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_1029_li
@changelog_1034_li
H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1030_li
@changelog_1035_li
A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1031_li
@changelog_1036_li
The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1032_li
@changelog_1037_li
Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1033_li
@changelog_1038_li
Server.startWebServer(Connection) was not working as expected.
@changelog_1034_li
@changelog_1039_li
The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1035_li
@changelog_1040_li
The database URL option RECOVER has currently no effect.
@changelog_1036_li
@changelog_1041_li
Converting an old (non-page store) database is no longer supported using this version.
@changelog_1037_li
@changelog_1042_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_1038_li
@changelog_1043_li
The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1039_li
@changelog_1044_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_1040_li
@changelog_1045_li
The translated resources are now stored in UTF-8 format.
@changelog_1041_li
@changelog_1046_li
The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1042_h2
@changelog_1047_h2
Version 1.2.128 (2010-01-30)
@changelog_1043_li
@changelog_1048_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_1044_li
@changelog_1049_li
The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1045_li
@changelog_1050_li
Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1046_li
@changelog_1051_li
Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1047_li
@changelog_1052_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_1048_li
@changelog_1053_li
Less classes are loaded when using the database in embedded mode.
@changelog_1049_li
@changelog_1054_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_1050_li
@changelog_1055_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_1051_li
@changelog_1056_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_1052_li
@changelog_1057_li
Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1053_li
@changelog_1058_li
Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1054_li
@changelog_1059_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_1055_li
@changelog_1060_li
If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1056_li
@changelog_1061_li
Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1057_li
@changelog_1062_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1058_li
@changelog_1063_li
Slightly improved performance if the table is already locked.
@changelog_1059_li
@changelog_1064_li
CompressLZF: faster decompression.
@changelog_1060_li
@changelog_1065_li
PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1061_li
@changelog_1066_li
Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1062_h2
@changelog_1067_h2
Version 1.2.127 (2010-01-15)
@changelog_1063_li
@changelog_1068_li
Serialized access mode (server-less multi-connection mode): sequences did not work as expected (there were gaps in generated values when using multiple connections).
@changelog_1064_li
@changelog_1069_li
Page store: new databases can not be opened with older versions.
@changelog_1065_li
@changelog_1070_li
Page store: adding data to new database is now faster.
@changelog_1066_li
@changelog_1071_li
File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1067_li
@changelog_1072_li
PgServer: incorrect SQL types were returned in result set meta data. Concurrently opening a database could fail (PG catalog initialization was not synchronized). Thanks a lot to Sergi Vladykin for providing the patches!
@changelog_1068_li
@changelog_1073_li
SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1069_li
@changelog_1074_li
Page store: the wrong write count was written to the database header. This could cause the server-less multi-connection mode to fail.
@changelog_1070_li
@changelog_1075_li
Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1071_li
@changelog_1076_li
If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1072_li
@changelog_1077_li
Alter table is now supported even if a table has views defined.
@changelog_1073_li
@changelog_1078_li
Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1074_li
@changelog_1079_li
The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1075_li
@changelog_1080_li
Trigger can now be called on rollback.
@changelog_1076_li
@changelog_1081_li
The shell script h2.sh ignored command line line arguments.
@changelog_1077_li
@changelog_1082_li
When running H2 in the Google AppEngine for Java, a AccessControlException could be thrown when trying to open a read-only database. Fixed.
@changelog_1078_li
@changelog_1083_li
The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1079_li
@changelog_1084_li
Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1080_li
@changelog_1085_li
The .trace.db file is now only created if required.
@changelog_1081_li
@changelog_1086_li
Shell tool: improved PostgreSQL compatibility.
@changelog_1082_li
@changelog_1087_li
Trying to open a database in read-only mode when a .lock.db file exists will now fail with a nice error message.
@changelog_1083_li
@changelog_1088_li
H2 Console: data that is too long is now abbreviated as follows: text... (100000 characters). A large binary is abbreviated as follows: abcdef... (100000 bytes).
@changelog_1084_li
@changelog_1089_li
Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1085_li
@changelog_1090_li
Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1086_li
@changelog_1091_li
CompressLZF: Faster decompress and improved javadocs
@changelog_1087_h2
@changelog_1092_h2
Version 1.2.126 (2009-12-18)
@changelog_1088_li
@changelog_1093_li
The ChangeFileEncryption tool will now fail with an exception if the database is still in use. The Backup tool will also fail except when running in quiet mode.
@changelog_1089_li
@changelog_1094_li
CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1090_li
@changelog_1095_li
Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1091_li
@changelog_1096_li
Script command and tool: the primary key constraint is now listed before inserting the data. This will result in a smaller database when using the page store.
@changelog_1092_li
@changelog_1097_li
Statements with IN(SELECT..) conditions could produce the wrong result. Example: index on id, name; query: select * from test where id between 1 and 3 and name in (select 'World').
@changelog_1093_li
@changelog_1098_li
Statements with IN(..) conditions could produce the wrong result when using views or nested select statements. Example: index on id; index on name; query: select * from (select * from test) where id=1 and name in('a', 'b'). select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1094_li
@changelog_1099_li
Page store: a rollback of a relatively large transaction could fail with an ArrayIndexOutOfBoundsException or a 'row not found' exception in the PageBtreeIndex in some cases.
@changelog_1095_li
@changelog_1100_li
JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1096_li
@changelog_1101_li
LIKE: any letter is now allowed after the escape character (which is still '\' by default). Previously, an exception was thrown (unlike other databases) if it was not the escape character, '_' or '%'. If the escape character appears at the end of the pattern, the result is it is ignored (like PostgreSQL and MS SQL Server).
@changelog_1097_li
@changelog_1102_li
The reserve heap memory is no longer used.
@changelog_1098_li
@changelog_1103_li
Database.checkpoint() could throw a NullPointerException.
@changelog_1099_h2
@changelog_1104_h2
Version 1.2.125 (2009-12-06)
@changelog_1100_li
@changelog_1105_li
Lucene fulltext search: the Lucene field names now match the table column names, except if the column names start with _ (in which case another _ is prepended). Unfortunately this change means existing fulltext indexes need to be re-built.
@changelog_1101_li
@changelog_1106_li
The shell tool now has a very simple statement history.
@changelog_1102_li
@changelog_1107_li
The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1103_li
@changelog_1108_li
Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1104_li
@changelog_1109_li
Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1105_li
@changelog_1110_li
Trying to alter a temporary table threw a strange exception. It is still not possible to do that, but the exception message is better now.
@changelog_1106_li
@changelog_1111_li
When the system property h2.maxMemoryRowsDistinct was set, and using SELECT DISTINCT, the temporary table was not correctly dropped. This could cause problems in recovery when the process was killed.
@changelog_1107_li
@changelog_1112_li
Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1108_li
@changelog_1113_li
Non-row based triggers were called even if the action didn't match the declared action (INSERT triggers were also called when deleting rows). This has been changed. The MERGE statement calls both INSERT and DELETE triggers.
@changelog_1109_li
@changelog_1114_li
Statements with IN(..) conditions could produce the wrong result or a data conversion error (since version 1.2.120). Examples: index on id, name, condition: id=1 and name in('Hello', 'x'); index on id, query: select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1110_li
@changelog_1115_li
The CompressTool was not multithreading safe. Because of this, the following database operations where also not multithreading safe (even when using different databases): the SCRIPT command (only when using compression), the COMPRESS function, and storing CLOB or BLOB data (only when compression is enabled).
@changelog_1111_li
@changelog_1116_li
The compression algorithm "LZF" is now about 33% faster than before when compressing small block (around 2 KB). It is much faster than Deflate, but the compression ratio is lower. Some of the optimizations are from Sam Van Oort, thanks a lot!
@changelog_1112_li
@changelog_1117_li
Compressing large blocks of data didn't work when using the "Deflate" compression algorithm. Compressing a lot of data could run out of heap memory.
@changelog_1113_li
@changelog_1118_li
The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1114_li
@changelog_1119_li
More bugs in the server-less multi-connection mode have been fixed.
@changelog_1115_li
@changelog_1120_li
When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1116_li
@changelog_1121_li
JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1117_li
@changelog_1122_li
User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1118_li
@changelog_1123_li
User defined functions with source code didn't work after re-opening the database.
@changelog_1119_li
@changelog_1124_li
The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1120_li
@changelog_1125_li
The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1121_li
@changelog_1126_li
Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1122_li
@changelog_1127_li
Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1123_h2
@changelog_1128_h2
Version 1.2.124 (2009-11-20)
@changelog_1124_li
@changelog_1129_li
Clustering: there is now a way to detect which cluster instances are running.
@changelog_1125_li
@changelog_1130_li
ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1126_li
@changelog_1131_li
The file lock thread is now stopped when the database is closed.
@changelog_1127_li
@changelog_1132_li
Issue 140: the Script tool now supports writing to a stream.
@changelog_1128_li
@changelog_1133_li
Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1129_li
@changelog_1134_li
Page store: new databases can not be opened with older versions.
@changelog_1130_li
@changelog_1135_li
Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1131_li
@changelog_1136_li
Page store: opening a database could theoretically result in an endless loop.
@changelog_1132_li
@changelog_1137_li
Page store: adding large indexed columns could get very slow.
@changelog_1133_li
@changelog_1138_li
Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1134_li
@changelog_1139_li
Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1135_li
@changelog_1140_li
Page store: sometimes opening a read-only database failed.
@changelog_1136_li
@changelog_1141_li
Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1137_li
@changelog_1142_li
Page store: when using a very small page size (128 bytes or smaller), writing a large row could result in an endless recursion. This is only a theoretical problem, as the page size is 2 KB.
@changelog_1138_li
@changelog_1143_li
Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1139_li
@changelog_1144_li
Page store: improved auto-recovery after power failure.
@changelog_1140_li
@changelog_1145_li
The JDBC client did not detect that it was not talking to an H2 server. This could result in strange exceptions when trying to connect to another kind of server.
@changelog_1141_li
@changelog_1146_li
User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1142_li
@changelog_1147_li
Database file lock: the exception "lock file modified in the future" is no longer thrown; instead, opening the file will be delayed by 2 seconds.
@changelog_1143_li
@changelog_1148_li
Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1144_li
@changelog_1149_li
Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1145_li
@changelog_1150_li
Improved read-only database detection.
@changelog_1146_h2
@changelog_1151_h2
Version 1.2.123 (2009-11-08)
@changelog_1147_li
@changelog_1152_li
Page store: new databases can not be opened with older versions.
@changelog_1148_li
@changelog_1153_li
Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1149_li
@changelog_1154_li
Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1150_li
@changelog_1155_li
When using multi-threaded kernel mode, setting disabling locking (LOCK_MODE=0) will now throw an exception. At this time this combination will result in corruption when multiple threads try to update the same table.
@changelog_1151_li
@changelog_1156_li
The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1152_li
@changelog_1157_li
The Lucene fulltext search now also returns the score.
@changelog_1153_li
@changelog_1158_li
New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1154_li
@changelog_1159_li
Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1155_li
@changelog_1160_li
Improved error messages: identifiers and values are now quoted.
@changelog_1156_li
@changelog_1161_li
Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1157_li
@changelog_1162_li
Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1158_h2
@changelog_1163_h2
Version 1.2.122 (2009-10-28)
@changelog_1159_li
@changelog_1164_li
The native fulltext search now supports streaming CLOB data.
@changelog_1160_li
@changelog_1165_li
If the database URL ends with ;PAGE_STORE=TRUE and a database in the old format exists, it is automatically converted to the new page store format if possible. A backup of the database is created first. Automatic conversion is not supported if the database was not closed normally (if it contains uncommitted transactions).
@changelog_1161_li
@changelog_1166_li
Dropping the current user is now allowed if another admin user exists.
@changelog_1162_li
@changelog_1167_li
Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1163_li
@changelog_1168_li
SHUTDOWN COMPACT now fully compacts the database.
@changelog_1164_li
@changelog_1169_li
New system properties h2.maxCompactCount and h2.maxCompactTime to allow changing the default behavior (at most 2 seconds compacting when closing the database).
@changelog_1165_li
@changelog_1170_li
New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1166_li
@changelog_1171_li
Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1167_li
@changelog_1172_li
Page store: opening a large database was slow if it was not closed before.
@changelog_1168_li
@changelog_1173_li
Page store: new write and read counters in the meta data table. Use SELECT * FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME IN( 'info.FILE_WRITE_TOTAL', 'info.FILE_WRITE', 'info.FILE_READ', 'info.CACHE_MAX_SIZE', 'info.CACHE_SIZE')
@changelog_1169_li
@changelog_1174_li
The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1170_li
@changelog_1175_li
The documentation is no longer available in Japanese because the translation was too much out of sync. Please use the Google translation instead.
@changelog_1171_li
@changelog_1176_li
Certain queries were not sorted if subselect queries were involved
@changelog_1172_li
@changelog_1177_li
More bugs in the server-less multi-connection mode have been fixed: 90097 The database is read only, caches must be cleared on reconnect, etc.
@changelog_1173_h2
@changelog_1178_h2
Version 1.2.121 (2009-10-11)
@changelog_1174_li
@changelog_1179_li
Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1175_li
@changelog_1180_li
CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1176_li
@changelog_1181_li
If a database in the old format exists, it is now used. The system property is used for new databases, or if databases exist in both formats. In any case, the flag in the URL overrides this logic.
@changelog_1177_li
@changelog_1182_li
Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1178_li
@changelog_1183_li
The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1179_li
@changelog_1184_li
New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1180_h2
@changelog_1185_h2
Version 1.2.120 (2009-10-04)
@changelog_1181_li
@changelog_1186_li
This is a beta version.
@changelog_1182_li
@changelog_1187_li
Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1183_li
@changelog_1188_li
In version 1.2, the following system properties are now enabled by default: h2.pageStore, h2.nullConcatIsNull, h2.optimizeInList. The default value for h2.defaultMaxLengthInplaceLob is now 4096 (it was 1024 with version 1.1).
@changelog_1184_li
@changelog_1189_li
New databases are now stored in the new 'page store' file format. Existing databases are kept in the old file format. To use the old file format, append ;PAGE_STORE=FALSE to the database URL or set the system property h2.pageStore to false.
@changelog_1185_li
@changelog_1190_li
Issue 125: Renaming primary keys was not persistent. Fixed. Unfortunately, databases created by this version can not be opened with older versions because of this change.
@changelog_1186_li
@changelog_1191_li
Issue 124: Hibernate schema validation failed for decimal/numeric columns. This problem is fixed in the Hibernate dialect that is included with H2 (src/tools/org/hibernate/dialect/H2Dialect.java.txt), but not in Hibernate yet.
@changelog_1187_li
@changelog_1192_li
PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1188_li
@changelog_1193_li
Linked tables now support default values when inserting, updating or merging.
@changelog_1189_li
@changelog_1194_li
Bugfixes in the page store.
@changelog_1190_li
@changelog_1195_li
Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1191_li
@changelog_1196_li
Allow writing to linked tables in readonly databases.
@changelog_1192_h2
@changelog_1197_h2
Version 1.1.119 (2009-09-26)
@changelog_1193_li
@changelog_1198_li
SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1194_li
@changelog_1199_li
Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1195_li
@changelog_1200_li
New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1196_li
@changelog_1201_li
New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1197_li
@changelog_1202_li
The cache algorithm TQ is disabled in this version, because it is unstable, and because the current implementation does not have any measurable advantages over the default.
@changelog_1198_li
@changelog_1203_li
New committer: Christian Peter. He works for <a href="http://www.docware.com">Docware</a> and helped a lot finding and fixing bugs, and generally improving the database. He is now a committer.
@changelog_1199_li
@changelog_1204_li
ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1200_li
@changelog_1205_li
Issue 121: JaQu: new simple update and merge methods.
@changelog_1201_li
@changelog_1206_li
Issue 120: JaQu didn't close result sets.
@changelog_1202_li
@changelog_1207_li
Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1203_li
@changelog_1208_li
The new page store mechanism is now alpha-level quality. The next release will most likely be "1.2.120 beta" where this mode is enabled by default. To use it right now, append ;PAGE_STORE=TRUE to the database URL. The file format of this mode will probably not change any more.
@changelog_1204_li
@changelog_1209_li
SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1205_li
@changelog_1210_li
The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1206_li
@changelog_1211_li
New sample application that shows how to pass data to a trigger.
@changelog_1207_li
@changelog_1212_li
More bugs in the server-less multi-connection mode have been fixed: On Windows, two processes could write to the same database at the same time.
@changelog_1208_li
@changelog_1213_li
When loading triggers or other client classes (static functions, database event listener, user aggregate functions, other JDBC drivers), the database now uses the context class loader if the class could not be found using Class.forName().
@changelog_1209_li
@changelog_1214_li
Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1210_li
@changelog_1215_li
Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1211_li
@changelog_1216_li
The native fulltext index kept a reference to a database after the database was closed.
@changelog_1212_li
@changelog_1217_li
Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1213_li
@changelog_1218_li
The optimizer does a better job for joins if indexes are missing.
@changelog_1214_h2
@changelog_1219_h2
Version 1.1.118 (2009-09-04)
@changelog_1215_li
@changelog_1220_li
SHOW COLUMNS only listed indexed columns.
@changelog_1216_li
@changelog_1221_li
When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1217_li
@changelog_1222_li
DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1218_li
@changelog_1223_li
AUTO_INCREMENT now works in the same way in ALTER TABLE ALTER COLUMN as in CREATE TABLE (it does not create a primary key).
@changelog_1219_li
@changelog_1224_li
Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1220_li
@changelog_1225_li
Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1221_li
@changelog_1226_li
JaQu: the plan is to support natural (pure Java / Scala) conditions such as (id == 1 && name.equals("Test")). A proof of concept decompiler is now included (it doesn't work yet).
@changelog_1222_li
@changelog_1227_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1223_li
@changelog_1228_li
PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1224_li
@changelog_1229_li
H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1225_li
@changelog_1230_li
Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1226_li
@changelog_1231_li
H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1227_li
@changelog_1232_li
Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1228_li
@changelog_1233_li
Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1229_li
@changelog_1234_li
Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1230_li
@changelog_1235_li
Issue 101: The following sequence could throw the exception "Row not found when trying to delete": start a transaction, insert many rows, delete many rows, rollback. The number of rows depends on the cache size.
@changelog_1231_li
@changelog_1236_li
The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1232_li
@changelog_1237_li
An optimization for OR is implemented, but disabled by default. Expressions of the type X=1 OR X=2 are converted to X IN(1, 2). To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver.
@changelog_1233_li
@changelog_1238_li
An optimization for IN(..) and IN(SELECT...) is implemented, but disabled by default. To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver. If enabled, this overrides h2.optimizeIn and h2.optimizeInJoin. Unlike now, this optimization will also speed up updates and deletes.
@changelog_1234_h2
@changelog_1239_h2
Version 1.1.117 (2009-08-09)
@changelog_1235_li
@changelog_1240_li
New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1236_li
@changelog_1241_li
JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1237_li
@changelog_1242_li
Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1238_li
@changelog_1243_li
LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1239_li
@changelog_1244_li
Views using functions were not re-evaluated when necessary.
@changelog_1240_li
@changelog_1245_li
Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1241_li
@changelog_1246_li
Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1242_li
@changelog_1247_li
Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1243_li
@changelog_1248_li
Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1244_li
@changelog_1249_li
Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1245_li
@changelog_1250_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1246_li
@changelog_1251_li
The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1247_li
@changelog_1252_li
Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1248_li
@changelog_1253_li
Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1249_li
@changelog_1254_li
Parsing SQL script files is now faster.
@changelog_1250_li
@changelog_1255_li
CSV reading is now faster.
@changelog_1251_li
@changelog_1256_li
SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1252_h2
@changelog_1257_h2
Version 1.1.116 (2009-07-18)
@changelog_1253_li
@changelog_1258_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1254_li
@changelog_1259_li
The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1255_li
@changelog_1260_li
H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1256_li
@changelog_1261_li
ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1257_li
@changelog_1262_li
Creating indexes is now a bit faster.
@changelog_1258_li
@changelog_1263_li
PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1259_li
@changelog_1264_li
PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1260_li
@changelog_1265_li
H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1261_li
@changelog_1266_li
Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1262_li
@changelog_1267_li
New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1263_li
@changelog_1268_li
JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1264_li
@changelog_1269_li
If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1265_li
@changelog_1270_li
Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1266_li
@changelog_1271_li
The Recover tool did not work with .data.db files of the wrong size.
@changelog_1267_li
@changelog_1272_li
Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1268_li
@changelog_1273_li
The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1269_li
@changelog_1274_li
To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1270_h2
@changelog_1275_h2
Version 1.1.115 (2009-06-21)
@changelog_1271_li
@changelog_1276_li
The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1272_li
@changelog_1277_li
ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1273_li
@changelog_1278_li
Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1274_li
@changelog_1279_li
java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1275_li
@changelog_1280_li
H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1276_li
@changelog_1281_li
H2 Console: improved Polish translation.
@changelog_1277_li
@changelog_1282_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1278_li
@changelog_1283_li
The download page now included the SHA1 checksums.
@changelog_1279_li
@changelog_1284_li
Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1280_li
@changelog_1285_li
The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1281_li
@changelog_1286_li
Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1282_li
@changelog_1287_li
Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1283_li
@changelog_1288_li
Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1284_li
@changelog_1289_li
Data types: LONG is now an alias for BIGINT.
@changelog_1285_h2
@changelog_1290_h2
Version 1.1.114 (2009-06-01)
@changelog_1286_li
@changelog_1291_li
ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1287_li
@changelog_1292_li
Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1288_li
@changelog_1293_li
In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1289_li
@changelog_1294_li
Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1290_li
@changelog_1295_li
The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1291_li
@changelog_1296_li
Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1292_h2
@changelog_1297_h2
Version 1.1.113 (2009-05-21)
@changelog_1293_li
@changelog_1298_li
Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1294_li
@changelog_1299_li
JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1295_li
@changelog_1300_li
When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1296_li
@changelog_1301_li
Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1297_li
@changelog_1302_li
MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1298_li
@changelog_1303_li
Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1299_li
Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1300_li
Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1301_li
H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1302_li
Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1303_h2
Version 1.1.112 (2009-05-01)
@changelog_1304_li
JdbcPreparedStatement.toString() could throw a NullPointerException.
Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1305_li
EclipseLink: added H2Platform.supportsIdentity().
Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1306_li
Connection pool: the default login timeout is now 5 minutes.
H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1307_li
After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1308_li
More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1308_h2
Version 1.1.112 (2009-05-01)
@changelog_1309_li
GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
JdbcPreparedStatement.toString() could throw a NullPointerException.
@changelog_1310_li
Improved error message when the .lock.db file modification time is in the future.
EclipseLink: added H2Platform.supportsIdentity().
@changelog_1311_li
The MERGE statement now returns 0 as the generated key if the row was updated.
Connection pool: the default login timeout is now 5 minutes.
@changelog_1312_li
Running code coverage is now automated.
After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1313_li
A file system implementation can now be registered using FileSystem.register.
More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1314_li
The database file system is no longer included in the jar file, it moved to the test section.
GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1315_h2
Version 1.1.111 (2009-04-10)
@changelog_1315_li
Improved error message when the .lock.db file modification time is in the future.
@changelog_1316_li
In-memory databases can now run inside the Google App Engine.
The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1317_li
Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
Running code coverage is now automated.
@changelog_1318_li
The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
A file system implementation can now be registered using FileSystem.register.
@changelog_1319_li
The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1320_li
Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1320_h2
Version 1.1.111 (2009-04-10)
@changelog_1321_li
The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
In-memory databases can now run inside the Google App Engine.
@changelog_1322_h2
Version 1.1.110 (2009-04-03)
@changelog_1322_li
Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1323_li
Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1324_li
The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1325_li
The data type of a SUBSTRING method was wrong.
Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1326_li
ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1327_li
H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1328_li
Improved Javadoc navigation (similar to Scaladoc).
@changelog_1329_li
H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1330_li
DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1331_li
The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1332_li
Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1333_li
Improved OSGi support.
@changelog_1334_li
Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1335_li
The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1336_li
Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1337_li
CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1338_li
DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1339_li
Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1340_li
JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1341_li
Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1342_li
The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1343_li
More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1344_li
Linked tables to SQLite database can now be created.
@changelog_1345_li
Nested IN(IN(...)) didn't work.
@changelog_1346_li
NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
To start the <a href="quickstart.html#h2_console">H2 Console tool</a>, double click the jar file, or run <code>java -jar h2*.jar</code>, <code>h2.bat</code>, or <code>h2.sh</code>.
...
...
@@ -2591,7 +2531,7 @@ database.H2Platform
Downloads
@download_1001_h3
Version 1.2.130 (2010-02-26)
Version 1.2.131 (2010-03-05)
@download_1002_a
Windows Installer
...
...
@@ -6425,7 +6365,7 @@ Small footprint: around 1 MB jar file size
Download
@mainWeb_1007_td
Version 1.2.130 (2010-02-26):
Version 1.2.131 (2010-03-05):
@mainWeb_1008_a
Windows Installer (4 MB)
...
...
@@ -8465,304 +8405,304 @@ Support custom Collators.
Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery).
@roadmap_1104_li
Clustering: when a database is back alive, automatically synchronize with the master.
MS SQL Server compatibility: support 1+'2'=3, '1'+'2'='12'
@roadmap_1105_li
File system that writes to two file systems (replication, replicating file system).
Clustering: when a database is back alive, automatically synchronize with the master.
@roadmap_1106_li
Standalone tool to get relevant system properties and add it to the trace output.
File system that writes to two file systems (replication, replicating file system).
@roadmap_1107_li
Support 'call proc(1=value)' (PostgreSQL, Oracle).
Standalone tool to get relevant system properties and add it to the trace output.
@roadmap_1108_li
JAMon (proxy jdbc driver).
Support 'call proc(1=value)' (PostgreSQL, Oracle).
@roadmap_1109_li
Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?).
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
Option to encrypt .trace.db file.
@roadmap_1113_li
Functions with unknown return or parameter data types: serialize / deserialize.
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@roadmap_1114_li
Test if idle TCP connections are closed, and how to disable that.
Functions with unknown return or parameter data types: serialize / deserialize.
@roadmap_1115_li
Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
Test if idle TCP connections are closed, and how to disable that.
@roadmap_1116_li
Auto-Update feature for database, .jar file.
Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
@roadmap_1117_li
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
Auto-Update feature for database, .jar file.
@roadmap_1118_li
Partial indexing (see PostgreSQL).
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
@roadmap_1119_li
Add GUI to build a custom version (embedded, fulltext,...) using build flags.
Partial indexing (see PostgreSQL).
@roadmap_1120_li
http://rubyforge.org/projects/hypersonic/
Add GUI to build a custom version (embedded, fulltext,...) using build flags.
@roadmap_1121_li
Add comparator (x === y) : (x = y or (x is null and y is null)).
http://rubyforge.org/projects/hypersonic/
@roadmap_1122_li
Try to create trace file even for read only databases.
Add comparator (x === y) : (x = y or (x is null and y is null)).
@roadmap_1123_li
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
Try to create trace file even for read only databases.
@roadmap_1124_li
Count on a column that can not be null could be optimized to COUNT(*).
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
@roadmap_1125_li
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
Count on a column that can not be null could be optimized to COUNT(*).
@roadmap_1126_li
Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
@roadmap_1127_li
Backup tool should work with other databases as well.
Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
@roadmap_1128_li
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
Backup tool should work with other databases as well.
@roadmap_1129_li
Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess).
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
Implement Clob / Blob truncate and the remaining functionality.
Compatibility for CREATE SCHEMA AUTHORIZATION.
@roadmap_1134_li
Maybe close LOBs after closing connection.
Implement Clob / Blob truncate and the remaining functionality.
@roadmap_1135_li
Tree join functionality.
Maybe close LOBs after closing connection.
@roadmap_1136_li
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
Tree join functionality.
@roadmap_1137_li
Add H2 to Gem (Ruby install system).
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
@roadmap_1138_li
API for functions / user tables.
Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1139_li
Order conditions inside AND / OR to optimize the performance.
Add H2 to Gem (Ruby install system).
@roadmap_1140_li
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER.
API for functions / user tables.
@roadmap_1141_li
Support linked JCR tables
Order conditions inside AND / OR to optimize the performance.
@roadmap_1142_li
Make sure H2 is supported by Execute Query: http://executequery.org/
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER.
@roadmap_1143_li
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
Support linked JCR tables
@roadmap_1144_li
Native fulltext search: min word length; store word positions
Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1145_li
Add an option to the SCRIPT command to generate only portable / standard SQL
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1146_li
Test Dezign for Databases: http://www.datanamic.com
Native fulltext search: min word length; store word positions
@roadmap_1147_li
Fast library for parsing / formatting: http://javolution.org/
Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1148_li
Updatable Views (simple cases first)
Test Dezign for Databases: http://www.datanamic.com
@roadmap_1149_li
Improve create index performance
Fast library for parsing / formatting: http://javolution.org/
@roadmap_1150_li
Implement more JDBC 4.0 features
Updatable Views (simple cases first)
@roadmap_1151_li
Support TRANSFORM / PIVOT as in MS Access
Improve create index performance
@roadmap_1152_li
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
Implement more JDBC 4.0 features
@roadmap_1153_li
Support updatable views with join on primary keys (to extend a table)
Support TRANSFORM / PIVOT as in MS Access
@roadmap_1154_li
Public interface for functions (not public static)
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1155_li
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
Support updatable views with join on primary keys (to extend a table)
@roadmap_1156_li
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
Public interface for functions (not public static)
@roadmap_1157_li
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1158_li
Updatable result set on table without primary key or unique index
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1159_li
Use LinkedList instead of ArrayList where applicable
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1160_li
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
Updatable result set on table without primary key or unique index
@roadmap_1161_li
Support % operator (modulo)
Use LinkedList instead of ArrayList where applicable
@roadmap_1162_li
Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1163_li
Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
Support % operator (modulo)
@roadmap_1164_li
Support nested transactions
Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
@roadmap_1165_li
Add a benchmark for big databases, and one for many users
Support nested transactions
@roadmap_1166_li
Compression in the result set (repeating values in the same column) over TCP/IP
Add a benchmark for big databases, and one for many users
@roadmap_1167_li
Support curtimestamp (like curtime, curdate)
Compression in the result set (repeating values in the same column) over TCP/IP
@roadmap_1168_li
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
Support curtimestamp (like curtime, curdate)
@roadmap_1169_li
Support Sequoia (Continuent.org)
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
@roadmap_1170_li
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
Support Sequoia (Continuent.org)
@roadmap_1171_li
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
@roadmap_1172_li
Release locks (shared or exclusive) on demand
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
@roadmap_1173_li
Support OUTER UNION
Release locks (shared or exclusive) on demand
@roadmap_1174_li
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
Support OUTER UNION
@roadmap_1175_li
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
@roadmap_1176_li
Option for SCRIPT to only process one or a set of tables, and append to a file
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
@roadmap_1177_li
Support linked tables to the current database
Option for SCRIPT to only process one or a set of tables, and append to a file
@roadmap_1178_li
Support dynamic linked schema (automatically adding/updating/removing tables)
Support linked tables to the current database
@roadmap_1179_li
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
Support dynamic linked schema (automatically adding/updating/removing tables)
@roadmap_1180_li
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@roadmap_1181_li
Run benchmarks with JDK 1.5, JDK 1.6, java -server
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@roadmap_1182_li
Optimizations: faster hash function for strings, byte arrays
Run benchmarks with JDK 1.5, JDK 1.6, java -server
@roadmap_1183_li
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
Optimizations: faster hash function for strings, byte arrays
@roadmap_1184_li
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@roadmap_1185_li
Benchmark: add a graph to show how databases scale (performance/database size)
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
@roadmap_1186_li
Implement a SQLData interface to map your data over to a custom object
Benchmark: add a graph to show how databases scale (performance/database size)
@roadmap_1187_li
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
Implement a SQLData interface to map your data over to a custom object
@roadmap_1188_li
Support multiple directories (on different hard drives) for the same database
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@roadmap_1189_li
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
Support multiple directories (on different hard drives) for the same database
@roadmap_1190_li
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@roadmap_1191_li
Support native XML data type
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@roadmap_1192_li
Support triggers with a string property or option: SpringTrigger, OSGITrigger
Support native XML data type
@roadmap_1193_li
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
Support triggers with a string property or option: SpringTrigger, OSGITrigger
@roadmap_1194_li
Ability to resize the cache array when resizing the cache
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@roadmap_1195_li
Time based cache writing (one second after writing the log)
Ability to resize the cache array when resizing the cache
@roadmap_1196_li
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
Time based cache writing (one second after writing the log)
@roadmap_1197_li
Index usage for REGEXP LIKE.
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
@roadmap_1198_li
Compatibility: add a role DBA (like ADMIN).
Index usage for REGEXP LIKE.
@roadmap_1199_li
Better support multiple processors for in-memory databases.
Compatibility: add a role DBA (like ADMIN).
@roadmap_1200_li
Support N'text'
Better support multiple processors for in-memory databases.
@roadmap_1201_li
Pure SQL triggers (example: update parent table if the child table is changed).
Support N'text'
@roadmap_1202_li
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1203_li
Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@roadmap_1204_li
Support compatibility for jdbc:hsqldb:res:
...
...
@@ -9481,16 +9421,25 @@ User defined functions: allow to store the bytecode (of just the class, or the j
@roadmap_1442_li
Compatibility: ResultSet.getObject() on a CLOB (TEXT) should return String for PostgreSQL and MySQL.
@roadmap_1443_h2
Not Planned
@roadmap_1443_li
Optimizer: WHERE X=? AND Y IN(?), it always uses the index on Y. Should be cost based.
@roadmap_1444_li
HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
Support ALTER SCHEMA name RENAME TO newName (rename schema).
@roadmap_1445_li
Make the cache scan resistant (currently a small cache is faster than a large cache for large table scans).
@roadmap_1446_h2
Not Planned
@roadmap_1447_li
HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
@roadmap_1448_li
String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@roadmap_1446_li
@roadmap_1449_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.
#EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
#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_1005_li
#IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
#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_1006_li
#IN(..): the index was not used if there were multiple IN(..) conditions.
#After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1007_li
#An IndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1008_h2
#Version 1.2.130 (2010-02-26)
@changelog_1009_li
#EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1010_li
#IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1011_li
#IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1012_li
#For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1008_li
@changelog_1013_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_1009_li
@changelog_1014_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_1010_li
@changelog_1015_li
#When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1011_li
@changelog_1016_li
#Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1012_li
@changelog_1017_li
#The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1013_li
@changelog_1018_li
#Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1014_li
@changelog_1019_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_1015_h2
@changelog_1020_h2
#Version 1.2.129 (2010-02-19)
@changelog_1016_li
@changelog_1021_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_1017_li
@changelog_1022_li
#CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1018_li
@changelog_1023_li
#MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1019_li
@changelog_1024_li
#Hash indexes now are only used for single column indexes.
@changelog_1020_li
@changelog_1025_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_1021_li
@changelog_1026_li
#The file system abstraction no longer throws SQL exceptions.
@changelog_1022_li
@changelog_1027_li
#DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1023_li
@changelog_1028_li
#The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1024_li
@changelog_1029_li
#SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1025_li
@changelog_1030_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_1026_li
@changelog_1031_li
#The BNF parser now uses the visitor pattern.
@changelog_1027_li
@changelog_1032_li
#Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1028_li
@changelog_1033_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_1029_li
@changelog_1034_li
#H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1030_li
@changelog_1035_li
#A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1031_li
@changelog_1036_li
#The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1032_li
@changelog_1037_li
#Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1033_li
@changelog_1038_li
#Server.startWebServer(Connection) was not working as expected.
@changelog_1034_li
@changelog_1039_li
#The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1035_li
@changelog_1040_li
#The database URL option RECOVER has currently no effect.
@changelog_1036_li
@changelog_1041_li
#Converting an old (non-page store) database is no longer supported using this version.
@changelog_1037_li
@changelog_1042_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_1038_li
@changelog_1043_li
#The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1039_li
@changelog_1044_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_1040_li
@changelog_1045_li
#The translated resources are now stored in UTF-8 format.
@changelog_1041_li
@changelog_1046_li
#The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1042_h2
@changelog_1047_h2
#Version 1.2.128 (2010-01-30)
@changelog_1043_li
@changelog_1048_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_1044_li
@changelog_1049_li
#The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1045_li
@changelog_1050_li
#Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1046_li
@changelog_1051_li
#Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1047_li
@changelog_1052_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_1048_li
@changelog_1053_li
#Less classes are loaded when using the database in embedded mode.
@changelog_1049_li
@changelog_1054_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_1050_li
@changelog_1055_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_1051_li
@changelog_1056_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_1052_li
@changelog_1057_li
#Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1053_li
@changelog_1058_li
#Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1054_li
@changelog_1059_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_1055_li
@changelog_1060_li
#If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1056_li
@changelog_1061_li
#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1057_li
@changelog_1062_li
#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1058_li
@changelog_1063_li
#Slightly improved performance if the table is already locked.
@changelog_1059_li
@changelog_1064_li
#CompressLZF: faster decompression.
@changelog_1060_li
@changelog_1065_li
#PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1061_li
@changelog_1066_li
#Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1062_h2
@changelog_1067_h2
#Version 1.2.127 (2010-01-15)
@changelog_1063_li
@changelog_1068_li
#Serialized access mode (server-less multi-connection mode): sequences did not work as expected (there were gaps in generated values when using multiple connections).
@changelog_1064_li
@changelog_1069_li
#Page store: new databases can not be opened with older versions.
@changelog_1065_li
@changelog_1070_li
#Page store: adding data to new database is now faster.
@changelog_1066_li
@changelog_1071_li
#File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1067_li
@changelog_1072_li
#PgServer: incorrect SQL types were returned in result set meta data. Concurrently opening a database could fail (PG catalog initialization was not synchronized). Thanks a lot to Sergi Vladykin for providing the patches!
@changelog_1068_li
@changelog_1073_li
#SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1069_li
@changelog_1074_li
#Page store: the wrong write count was written to the database header. This could cause the server-less multi-connection mode to fail.
@changelog_1070_li
@changelog_1075_li
#Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1071_li
@changelog_1076_li
#If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1072_li
@changelog_1077_li
#Alter table is now supported even if a table has views defined.
@changelog_1073_li
@changelog_1078_li
#Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1074_li
@changelog_1079_li
#The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1075_li
@changelog_1080_li
#Trigger can now be called on rollback.
@changelog_1076_li
@changelog_1081_li
#The shell script h2.sh ignored command line line arguments.
@changelog_1077_li
@changelog_1082_li
#When running H2 in the Google AppEngine for Java, a AccessControlException could be thrown when trying to open a read-only database. Fixed.
@changelog_1078_li
@changelog_1083_li
#The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1079_li
@changelog_1084_li
#Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1080_li
@changelog_1085_li
#The .trace.db file is now only created if required.
@changelog_1081_li
@changelog_1086_li
#Shell tool: improved PostgreSQL compatibility.
@changelog_1082_li
@changelog_1087_li
#Trying to open a database in read-only mode when a .lock.db file exists will now fail with a nice error message.
@changelog_1083_li
@changelog_1088_li
#H2 Console: data that is too long is now abbreviated as follows: text... (100000 characters). A large binary is abbreviated as follows: abcdef... (100000 bytes).
@changelog_1084_li
@changelog_1089_li
#Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1085_li
@changelog_1090_li
#Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1086_li
@changelog_1091_li
#CompressLZF: Faster decompress and improved javadocs
@changelog_1087_h2
@changelog_1092_h2
#Version 1.2.126 (2009-12-18)
@changelog_1088_li
@changelog_1093_li
#The ChangeFileEncryption tool will now fail with an exception if the database is still in use. The Backup tool will also fail except when running in quiet mode.
@changelog_1089_li
@changelog_1094_li
#CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1090_li
@changelog_1095_li
#Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1091_li
@changelog_1096_li
#Script command and tool: the primary key constraint is now listed before inserting the data. This will result in a smaller database when using the page store.
@changelog_1092_li
@changelog_1097_li
#Statements with IN(SELECT..) conditions could produce the wrong result. Example: index on id, name; query: select * from test where id between 1 and 3 and name in (select 'World').
@changelog_1093_li
@changelog_1098_li
#Statements with IN(..) conditions could produce the wrong result when using views or nested select statements. Example: index on id; index on name; query: select * from (select * from test) where id=1 and name in('a', 'b'). select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1094_li
@changelog_1099_li
#Page store: a rollback of a relatively large transaction could fail with an ArrayIndexOutOfBoundsException or a 'row not found' exception in the PageBtreeIndex in some cases.
@changelog_1095_li
@changelog_1100_li
#JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1096_li
@changelog_1101_li
#LIKE: any letter is now allowed after the escape character (which is still '\' by default). Previously, an exception was thrown (unlike other databases) if it was not the escape character, '_' or '%'. If the escape character appears at the end of the pattern, the result is it is ignored (like PostgreSQL and MS SQL Server).
@changelog_1097_li
@changelog_1102_li
#The reserve heap memory is no longer used.
@changelog_1098_li
@changelog_1103_li
#Database.checkpoint() could throw a NullPointerException.
@changelog_1099_h2
@changelog_1104_h2
#Version 1.2.125 (2009-12-06)
@changelog_1100_li
@changelog_1105_li
#Lucene fulltext search: the Lucene field names now match the table column names, except if the column names start with _ (in which case another _ is prepended). Unfortunately this change means existing fulltext indexes need to be re-built.
@changelog_1101_li
@changelog_1106_li
#The shell tool now has a very simple statement history.
@changelog_1102_li
@changelog_1107_li
#The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1103_li
@changelog_1108_li
#Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1104_li
@changelog_1109_li
#Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1105_li
@changelog_1110_li
#Trying to alter a temporary table threw a strange exception. It is still not possible to do that, but the exception message is better now.
@changelog_1106_li
@changelog_1111_li
#When the system property h2.maxMemoryRowsDistinct was set, and using SELECT DISTINCT, the temporary table was not correctly dropped. This could cause problems in recovery when the process was killed.
@changelog_1107_li
@changelog_1112_li
#Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1108_li
@changelog_1113_li
#Non-row based triggers were called even if the action didn't match the declared action (INSERT triggers were also called when deleting rows). This has been changed. The MERGE statement calls both INSERT and DELETE triggers.
@changelog_1109_li
@changelog_1114_li
#Statements with IN(..) conditions could produce the wrong result or a data conversion error (since version 1.2.120). Examples: index on id, name, condition: id=1 and name in('Hello', 'x'); index on id, query: select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1110_li
@changelog_1115_li
#The CompressTool was not multithreading safe. Because of this, the following database operations where also not multithreading safe (even when using different databases): the SCRIPT command (only when using compression), the COMPRESS function, and storing CLOB or BLOB data (only when compression is enabled).
@changelog_1111_li
@changelog_1116_li
#The compression algorithm "LZF" is now about 33% faster than before when compressing small block (around 2 KB). It is much faster than Deflate, but the compression ratio is lower. Some of the optimizations are from Sam Van Oort, thanks a lot!
@changelog_1112_li
@changelog_1117_li
#Compressing large blocks of data didn't work when using the "Deflate" compression algorithm. Compressing a lot of data could run out of heap memory.
@changelog_1113_li
@changelog_1118_li
#The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1114_li
@changelog_1119_li
#More bugs in the server-less multi-connection mode have been fixed.
@changelog_1115_li
@changelog_1120_li
#When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1116_li
@changelog_1121_li
#JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1117_li
@changelog_1122_li
#User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1118_li
@changelog_1123_li
#User defined functions with source code didn't work after re-opening the database.
@changelog_1119_li
@changelog_1124_li
#The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1120_li
@changelog_1125_li
#The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1121_li
@changelog_1126_li
#Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1122_li
@changelog_1127_li
#Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1123_h2
@changelog_1128_h2
#Version 1.2.124 (2009-11-20)
@changelog_1124_li
@changelog_1129_li
#Clustering: there is now a way to detect which cluster instances are running.
@changelog_1125_li
@changelog_1130_li
#ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1126_li
@changelog_1131_li
#The file lock thread is now stopped when the database is closed.
@changelog_1127_li
@changelog_1132_li
#Issue 140: the Script tool now supports writing to a stream.
@changelog_1128_li
@changelog_1133_li
#Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1129_li
@changelog_1134_li
#Page store: new databases can not be opened with older versions.
@changelog_1130_li
@changelog_1135_li
#Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1131_li
@changelog_1136_li
#Page store: opening a database could theoretically result in an endless loop.
@changelog_1132_li
@changelog_1137_li
#Page store: adding large indexed columns could get very slow.
@changelog_1133_li
@changelog_1138_li
#Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1134_li
@changelog_1139_li
#Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1135_li
@changelog_1140_li
#Page store: sometimes opening a read-only database failed.
@changelog_1136_li
@changelog_1141_li
#Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1137_li
@changelog_1142_li
#Page store: when using a very small page size (128 bytes or smaller), writing a large row could result in an endless recursion. This is only a theoretical problem, as the page size is 2 KB.
@changelog_1138_li
@changelog_1143_li
#Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1139_li
@changelog_1144_li
#Page store: improved auto-recovery after power failure.
@changelog_1140_li
@changelog_1145_li
#The JDBC client did not detect that it was not talking to an H2 server. This could result in strange exceptions when trying to connect to another kind of server.
@changelog_1141_li
@changelog_1146_li
#User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1142_li
@changelog_1147_li
#Database file lock: the exception "lock file modified in the future" is no longer thrown; instead, opening the file will be delayed by 2 seconds.
@changelog_1143_li
@changelog_1148_li
#Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1144_li
@changelog_1149_li
#Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1145_li
@changelog_1150_li
#Improved read-only database detection.
@changelog_1146_h2
@changelog_1151_h2
#Version 1.2.123 (2009-11-08)
@changelog_1147_li
@changelog_1152_li
#Page store: new databases can not be opened with older versions.
@changelog_1148_li
@changelog_1153_li
#Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1149_li
@changelog_1154_li
#Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1150_li
@changelog_1155_li
#When using multi-threaded kernel mode, setting disabling locking (LOCK_MODE=0) will now throw an exception. At this time this combination will result in corruption when multiple threads try to update the same table.
@changelog_1151_li
@changelog_1156_li
#The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1152_li
@changelog_1157_li
#The Lucene fulltext search now also returns the score.
@changelog_1153_li
@changelog_1158_li
# New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1154_li
@changelog_1159_li
#Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1155_li
@changelog_1160_li
#Improved error messages: identifiers and values are now quoted.
@changelog_1156_li
@changelog_1161_li
#Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1157_li
@changelog_1162_li
#Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1158_h2
@changelog_1163_h2
#Version 1.2.122 (2009-10-28)
@changelog_1159_li
@changelog_1164_li
#The native fulltext search now supports streaming CLOB data.
@changelog_1160_li
@changelog_1165_li
#If the database URL ends with ;PAGE_STORE=TRUE and a database in the old format exists, it is automatically converted to the new page store format if possible. A backup of the database is created first. Automatic conversion is not supported if the database was not closed normally (if it contains uncommitted transactions).
@changelog_1161_li
@changelog_1166_li
#Dropping the current user is now allowed if another admin user exists.
@changelog_1162_li
@changelog_1167_li
#Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1163_li
@changelog_1168_li
#SHUTDOWN COMPACT now fully compacts the database.
@changelog_1164_li
@changelog_1169_li
#New system properties h2.maxCompactCount and h2.maxCompactTime to allow changing the default behavior (at most 2 seconds compacting when closing the database).
@changelog_1165_li
@changelog_1170_li
#New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1166_li
@changelog_1171_li
#Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1167_li
@changelog_1172_li
#Page store: opening a large database was slow if it was not closed before.
@changelog_1168_li
@changelog_1173_li
#Page store: new write and read counters in the meta data table. Use SELECT * FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME IN( 'info.FILE_WRITE_TOTAL', 'info.FILE_WRITE', 'info.FILE_READ', 'info.CACHE_MAX_SIZE', 'info.CACHE_SIZE')
@changelog_1169_li
@changelog_1174_li
#The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1170_li
@changelog_1175_li
#The documentation is no longer available in Japanese because the translation was too much out of sync. Please use the Google translation instead.
@changelog_1171_li
@changelog_1176_li
#Certain queries were not sorted if subselect queries were involved
@changelog_1172_li
@changelog_1177_li
#More bugs in the server-less multi-connection mode have been fixed: 90097 The database is read only, caches must be cleared on reconnect, etc.
@changelog_1173_h2
@changelog_1178_h2
#Version 1.2.121 (2009-10-11)
@changelog_1174_li
@changelog_1179_li
#Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1175_li
@changelog_1180_li
#CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1176_li
@changelog_1181_li
#If a database in the old format exists, it is now used. The system property is used for new databases, or if databases exist in both formats. In any case, the flag in the URL overrides this logic.
@changelog_1177_li
@changelog_1182_li
#Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1178_li
@changelog_1183_li
#The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1179_li
@changelog_1184_li
#New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1180_h2
@changelog_1185_h2
#Version 1.2.120 (2009-10-04)
@changelog_1181_li
@changelog_1186_li
#This is a beta version.
@changelog_1182_li
@changelog_1187_li
#Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1183_li
@changelog_1188_li
#In version 1.2, the following system properties are now enabled by default: h2.pageStore, h2.nullConcatIsNull, h2.optimizeInList. The default value for h2.defaultMaxLengthInplaceLob is now 4096 (it was 1024 with version 1.1).
@changelog_1184_li
@changelog_1189_li
#New databases are now stored in the new 'page store' file format. Existing databases are kept in the old file format. To use the old file format, append ;PAGE_STORE=FALSE to the database URL or set the system property h2.pageStore to false.
@changelog_1185_li
@changelog_1190_li
#Issue 125: Renaming primary keys was not persistent. Fixed. Unfortunately, databases created by this version can not be opened with older versions because of this change.
@changelog_1186_li
@changelog_1191_li
#Issue 124: Hibernate schema validation failed for decimal/numeric columns. This problem is fixed in the Hibernate dialect that is included with H2 (src/tools/org/hibernate/dialect/H2Dialect.java.txt), but not in Hibernate yet.
@changelog_1187_li
@changelog_1192_li
#PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1188_li
@changelog_1193_li
#Linked tables now support default values when inserting, updating or merging.
@changelog_1189_li
@changelog_1194_li
#Bugfixes in the page store.
@changelog_1190_li
@changelog_1195_li
#Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1191_li
@changelog_1196_li
#Allow writing to linked tables in readonly databases.
@changelog_1192_h2
@changelog_1197_h2
#Version 1.1.119 (2009-09-26)
@changelog_1193_li
@changelog_1198_li
#SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1194_li
@changelog_1199_li
#Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1195_li
@changelog_1200_li
#New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1196_li
@changelog_1201_li
#New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1197_li
@changelog_1202_li
#The cache algorithm TQ is disabled in this version, because it is unstable, and because the current implementation does not have any measurable advantages over the default.
@changelog_1198_li
@changelog_1203_li
#New committer: Christian Peter. He works for <a href="http://www.docware.com">Docware</a> and helped a lot finding and fixing bugs, and generally improving the database. He is now a committer.
@changelog_1199_li
@changelog_1204_li
#ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1200_li
@changelog_1205_li
#Issue 121: JaQu: new simple update and merge methods.
@changelog_1201_li
@changelog_1206_li
#Issue 120: JaQu didn't close result sets.
@changelog_1202_li
@changelog_1207_li
#Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1203_li
@changelog_1208_li
#The new page store mechanism is now alpha-level quality. The next release will most likely be "1.2.120 beta" where this mode is enabled by default. To use it right now, append ;PAGE_STORE=TRUE to the database URL. The file format of this mode will probably not change any more.
@changelog_1204_li
@changelog_1209_li
#SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1205_li
@changelog_1210_li
#The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1206_li
@changelog_1211_li
#New sample application that shows how to pass data to a trigger.
@changelog_1207_li
@changelog_1212_li
#More bugs in the server-less multi-connection mode have been fixed: On Windows, two processes could write to the same database at the same time.
@changelog_1208_li
@changelog_1213_li
#When loading triggers or other client classes (static functions, database event listener, user aggregate functions, other JDBC drivers), the database now uses the context class loader if the class could not be found using Class.forName().
@changelog_1209_li
@changelog_1214_li
#Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1210_li
@changelog_1215_li
#Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1211_li
@changelog_1216_li
#The native fulltext index kept a reference to a database after the database was closed.
@changelog_1212_li
@changelog_1217_li
#Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1213_li
@changelog_1218_li
#The optimizer does a better job for joins if indexes are missing.
@changelog_1214_h2
@changelog_1219_h2
#Version 1.1.118 (2009-09-04)
@changelog_1215_li
@changelog_1220_li
#SHOW COLUMNS only listed indexed columns.
@changelog_1216_li
@changelog_1221_li
#When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1217_li
@changelog_1222_li
#DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1218_li
@changelog_1223_li
#AUTO_INCREMENT now works in the same way in ALTER TABLE ALTER COLUMN as in CREATE TABLE (it does not create a primary key).
@changelog_1219_li
@changelog_1224_li
#Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1220_li
@changelog_1225_li
#Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1221_li
@changelog_1226_li
#JaQu: the plan is to support natural (pure Java / Scala) conditions such as (id == 1 && name.equals("Test")). A proof of concept decompiler is now included (it doesn't work yet).
@changelog_1222_li
@changelog_1227_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1223_li
@changelog_1228_li
#PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1224_li
@changelog_1229_li
#H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1225_li
@changelog_1230_li
#Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1226_li
@changelog_1231_li
#H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1227_li
@changelog_1232_li
#Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1228_li
@changelog_1233_li
#Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1229_li
@changelog_1234_li
#Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1230_li
@changelog_1235_li
#Issue 101: The following sequence could throw the exception "Row not found when trying to delete": start a transaction, insert many rows, delete many rows, rollback. The number of rows depends on the cache size.
@changelog_1231_li
@changelog_1236_li
#The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1232_li
@changelog_1237_li
#An optimization for OR is implemented, but disabled by default. Expressions of the type X=1 OR X=2 are converted to X IN(1, 2). To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver.
@changelog_1233_li
@changelog_1238_li
#An optimization for IN(..) and IN(SELECT...) is implemented, but disabled by default. To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver. If enabled, this overrides h2.optimizeIn and h2.optimizeInJoin. Unlike now, this optimization will also speed up updates and deletes.
@changelog_1234_h2
@changelog_1239_h2
#Version 1.1.117 (2009-08-09)
@changelog_1235_li
@changelog_1240_li
#New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1236_li
@changelog_1241_li
#JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1237_li
@changelog_1242_li
#Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1238_li
@changelog_1243_li
#LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1239_li
@changelog_1244_li
#Views using functions were not re-evaluated when necessary.
@changelog_1240_li
@changelog_1245_li
#Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1241_li
@changelog_1246_li
#Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1242_li
@changelog_1247_li
#Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1243_li
@changelog_1248_li
#Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1244_li
@changelog_1249_li
#Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1245_li
@changelog_1250_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1246_li
@changelog_1251_li
#The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1247_li
@changelog_1252_li
#Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1248_li
@changelog_1253_li
#Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1249_li
@changelog_1254_li
#Parsing SQL script files is now faster.
@changelog_1250_li
@changelog_1255_li
#CSV reading is now faster.
@changelog_1251_li
@changelog_1256_li
#SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1252_h2
@changelog_1257_h2
#Version 1.1.116 (2009-07-18)
@changelog_1253_li
@changelog_1258_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1254_li
@changelog_1259_li
#The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1255_li
@changelog_1260_li
#H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1256_li
@changelog_1261_li
#ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1257_li
@changelog_1262_li
#Creating indexes is now a bit faster.
@changelog_1258_li
@changelog_1263_li
#PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1259_li
@changelog_1264_li
#PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1260_li
@changelog_1265_li
#H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1261_li
@changelog_1266_li
#Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1262_li
@changelog_1267_li
#New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1263_li
@changelog_1268_li
#JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1264_li
@changelog_1269_li
#If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1265_li
@changelog_1270_li
#Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1266_li
@changelog_1271_li
#The Recover tool did not work with .data.db files of the wrong size.
@changelog_1267_li
@changelog_1272_li
#Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1268_li
@changelog_1273_li
#The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1269_li
@changelog_1274_li
#To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1270_h2
@changelog_1275_h2
#Version 1.1.115 (2009-06-21)
@changelog_1271_li
@changelog_1276_li
#The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1272_li
@changelog_1277_li
#ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1273_li
@changelog_1278_li
#Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1274_li
@changelog_1279_li
#java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1275_li
@changelog_1280_li
#H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1276_li
@changelog_1281_li
#H2 Console: improved Polish translation.
@changelog_1277_li
@changelog_1282_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1278_li
@changelog_1283_li
#The download page now included the SHA1 checksums.
@changelog_1279_li
@changelog_1284_li
#Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1280_li
@changelog_1285_li
#The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1281_li
@changelog_1286_li
#Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1282_li
@changelog_1287_li
#Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1283_li
@changelog_1288_li
#Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1284_li
@changelog_1289_li
#Data types: LONG is now an alias for BIGINT.
@changelog_1285_h2
@changelog_1290_h2
#Version 1.1.114 (2009-06-01)
@changelog_1286_li
@changelog_1291_li
#ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1287_li
@changelog_1292_li
#Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1288_li
@changelog_1293_li
#In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1289_li
@changelog_1294_li
#Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1290_li
@changelog_1295_li
#The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1291_li
@changelog_1296_li
#Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1292_h2
@changelog_1297_h2
#Version 1.1.113 (2009-05-21)
@changelog_1293_li
@changelog_1298_li
#Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1294_li
@changelog_1299_li
#JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1295_li
@changelog_1300_li
#When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1296_li
@changelog_1301_li
#Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1297_li
@changelog_1302_li
#MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1298_li
@changelog_1303_li
#Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1299_li
#Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1300_li
#Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1301_li
#H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1302_li
#Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1303_h2
#Version 1.1.112 (2009-05-01)
@changelog_1304_li
#JdbcPreparedStatement.toString() could throw a NullPointerException.
#Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
#Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1306_li
#Connection pool: the default login timeout is now 5 minutes.
#H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1307_li
#After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
#Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1308_li
#More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1308_h2
#Version 1.1.112 (2009-05-01)
@changelog_1309_li
#GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
#JdbcPreparedStatement.toString() could throw a NullPointerException.
@changelog_1310_li
#Improved error message when the .lock.db file modification time is in the future.
#The MERGE statement now returns 0 as the generated key if the row was updated.
#Connection pool: the default login timeout is now 5 minutes.
@changelog_1312_li
#Running code coverage is now automated.
#After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1313_li
#A file system implementation can now be registered using FileSystem.register.
#More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1314_li
#The database file system is no longer included in the jar file, it moved to the test section.
#GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1315_h2
#Version 1.1.111 (2009-04-10)
@changelog_1315_li
#Improved error message when the .lock.db file modification time is in the future.
@changelog_1316_li
#In-memory databases can now run inside the Google App Engine.
#The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1317_li
#Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
#Running code coverage is now automated.
@changelog_1318_li
#The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
#A file system implementation can now be registered using FileSystem.register.
@changelog_1319_li
#The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
#The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1320_li
#Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1320_h2
#Version 1.1.111 (2009-04-10)
@changelog_1321_li
#The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
#In-memory databases can now run inside the Google App Engine.
@changelog_1322_h2
#Version 1.1.110 (2009-04-03)
@changelog_1322_li
#Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1323_li
#Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
#The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1324_li
#The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
#The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1325_li
#The data type of a SUBSTRING method was wrong.
#Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1326_li
#ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1327_li
#H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1328_li
#Improved Javadoc navigation (similar to Scaladoc).
@changelog_1329_li
#H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1330_li
#DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1331_li
#The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1332_li
#Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1333_li
#Improved OSGi support.
@changelog_1334_li
#Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1335_li
#The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1336_li
#Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1337_li
#CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1338_li
#DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1339_li
#Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1340_li
#JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1341_li
#Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1342_li
#The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1343_li
#More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1344_li
#Linked tables to SQLite database can now be created.
@changelog_1345_li
#Nested IN(IN(...)) didn't work.
@changelog_1346_li
#NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
#The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
#To start the <a href="quickstart.html#h2_console">H2 Console tool</a>, double click the jar file, or run <code>java -jar h2*.jar</code>, <code>h2.bat</code>, or <code>h2.sh</code>.
...
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@@ -2591,7 +2531,7 @@ jdbc:h2:mem:
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@download_1001_h3
#Version 1.2.130 (2010-02-26)
#Version 1.2.131 (2010-03-05)
@download_1002_a
Windows Installer
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@@ -6425,7 +6365,7 @@ H2 データベース エンジン
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@mainWeb_1007_td
# Version 1.2.130 (2010-02-26):
# Version 1.2.131 (2010-03-05):
@mainWeb_1008_a
#Windows Installer (4 MB)
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@@ -8465,304 +8405,304 @@ H2 コンソール アプリケーション
#Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery).
@roadmap_1104_li
#Clustering: when a database is back alive, automatically synchronize with the master.
#MS SQL Server compatibility: support 1+'2'=3, '1'+'2'='12'
@roadmap_1105_li
#File system that writes to two file systems (replication, replicating file system).
#Clustering: when a database is back alive, automatically synchronize with the master.
@roadmap_1106_li
#Standalone tool to get relevant system properties and add it to the trace output.
#File system that writes to two file systems (replication, replicating file system).
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
#Option to encrypt .trace.db file.
@roadmap_1113_li
#Functions with unknown return or parameter data types: serialize / deserialize.
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@roadmap_1114_li
#Test if idle TCP connections are closed, and how to disable that.
#Functions with unknown return or parameter data types: serialize / deserialize.
@roadmap_1115_li
#Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
#Test if idle TCP connections are closed, and how to disable that.
@roadmap_1116_li
#Auto-Update feature for database, .jar file.
#Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
@roadmap_1117_li
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
#Auto-Update feature for database, .jar file.
@roadmap_1118_li
#Partial indexing (see PostgreSQL).
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
@roadmap_1119_li
#Add GUI to build a custom version (embedded, fulltext,...) using build flags.
#Partial indexing (see PostgreSQL).
@roadmap_1120_li
#http://rubyforge.org/projects/hypersonic/
#Add GUI to build a custom version (embedded, fulltext,...) using build flags.
@roadmap_1121_li
#Add comparator (x === y) : (x = y or (x is null and y is null)).
#http://rubyforge.org/projects/hypersonic/
@roadmap_1122_li
#Try to create trace file even for read only databases.
#Add comparator (x === y) : (x = y or (x is null and y is null)).
@roadmap_1123_li
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
#Try to create trace file even for read only databases.
@roadmap_1124_li
#Count on a column that can not be null could be optimized to COUNT(*).
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
@roadmap_1125_li
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
#Count on a column that can not be null could be optimized to COUNT(*).
@roadmap_1126_li
#Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
@roadmap_1127_li
#Backup tool should work with other databases as well.
#Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
@roadmap_1128_li
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
#Backup tool should work with other databases as well.
@roadmap_1129_li
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess).
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
#Implement Clob / Blob truncate and the remaining functionality.
#Compatibility for CREATE SCHEMA AUTHORIZATION.
@roadmap_1134_li
#Maybe close LOBs after closing connection.
#Implement Clob / Blob truncate and the remaining functionality.
@roadmap_1135_li
#Tree join functionality.
#Maybe close LOBs after closing connection.
@roadmap_1136_li
#Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
#Tree join functionality.
@roadmap_1137_li
#Add H2 to Gem (Ruby install system).
#Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
@roadmap_1138_li
#API for functions / user tables.
#Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1139_li
#Order conditions inside AND / OR to optimize the performance.
#Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
#Support linked JCR tables
@roadmap_1144_li
#Native fulltext search: min word length; store word positions
#Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1145_li
#Add an option to the SCRIPT command to generate only portable / standard SQL
#Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1146_li
#Test Dezign for Databases: http://www.datanamic.com
#Native fulltext search: min word length; store word positions
@roadmap_1147_li
#Fast library for parsing / formatting: http://javolution.org/
#Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1148_li
#Updatable Views (simple cases first)
#Test Dezign for Databases: http://www.datanamic.com
@roadmap_1149_li
#Improve create index performance
#Fast library for parsing / formatting: http://javolution.org/
@roadmap_1150_li
#Implement more JDBC 4.0 features
#Updatable Views (simple cases first)
@roadmap_1151_li
#Support TRANSFORM / PIVOT as in MS Access
#Improve create index performance
@roadmap_1152_li
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
#Implement more JDBC 4.0 features
@roadmap_1153_li
#Support updatable views with join on primary keys (to extend a table)
#Support TRANSFORM / PIVOT as in MS Access
@roadmap_1154_li
#Public interface for functions (not public static)
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1155_li
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
#Support updatable views with join on primary keys (to extend a table)
@roadmap_1156_li
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
#Public interface for functions (not public static)
@roadmap_1157_li
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1158_li
#Updatable result set on table without primary key or unique index
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1159_li
#Use LinkedList instead of ArrayList where applicable
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1160_li
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
#Updatable result set on table without primary key or unique index
@roadmap_1161_li
#Support % operator (modulo)
#Use LinkedList instead of ArrayList where applicable
@roadmap_1162_li
#Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1163_li
#Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
#Support % operator (modulo)
@roadmap_1164_li
#Support nested transactions
#Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
@roadmap_1165_li
#Add a benchmark for big databases, and one for many users
#Support nested transactions
@roadmap_1166_li
#Compression in the result set (repeating values in the same column) over TCP/IP
#Add a benchmark for big databases, and one for many users
@roadmap_1167_li
#Support curtimestamp (like curtime, curdate)
#Compression in the result set (repeating values in the same column) over TCP/IP
#Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
#Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@roadmap_1181_li
#Run benchmarks with JDK 1.5, JDK 1.6, java -server
#Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@roadmap_1182_li
#Optimizations: faster hash function for strings, byte arrays
#Run benchmarks with JDK 1.5, JDK 1.6, java -server
@roadmap_1183_li
#DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
#Optimizations: faster hash function for strings, byte arrays
@roadmap_1184_li
#H2 Console / large result sets: use 'streaming' instead of building the page in-memory
#DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@roadmap_1185_li
#Benchmark: add a graph to show how databases scale (performance/database size)
#H2 Console / large result sets: use 'streaming' instead of building the page in-memory
@roadmap_1186_li
#Implement a SQLData interface to map your data over to a custom object
#Benchmark: add a graph to show how databases scale (performance/database size)
@roadmap_1187_li
#In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
#Implement a SQLData interface to map your data over to a custom object
@roadmap_1188_li
#Support multiple directories (on different hard drives) for the same database
#In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@roadmap_1189_li
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
#Support multiple directories (on different hard drives) for the same database
@roadmap_1190_li
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@roadmap_1191_li
#Support native XML data type
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@roadmap_1192_li
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
#Support native XML data type
@roadmap_1193_li
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
@roadmap_1194_li
#Ability to resize the cache array when resizing the cache
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@roadmap_1195_li
#Time based cache writing (one second after writing the log)
#Ability to resize the cache array when resizing the cache
@roadmap_1196_li
#Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
#Time based cache writing (one second after writing the log)
@roadmap_1197_li
#Index usage for REGEXP LIKE.
#Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
@roadmap_1198_li
#Compatibility: add a role DBA (like ADMIN).
#Index usage for REGEXP LIKE.
@roadmap_1199_li
#Better support multiple processors for in-memory databases.
#Compatibility: add a role DBA (like ADMIN).
@roadmap_1200_li
#Support N'text'
#Better support multiple processors for in-memory databases.
@roadmap_1201_li
#Pure SQL triggers (example: update parent table if the child table is changed).
#Support N'text'
@roadmap_1202_li
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
#Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1203_li
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@roadmap_1204_li
#Support compatibility for jdbc:hsqldb:res:
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@@ -9481,16 +9421,25 @@ H2 コンソール アプリケーション
@roadmap_1442_li
#Compatibility: ResultSet.getObject() on a CLOB (TEXT) should return String for PostgreSQL and MySQL.
@roadmap_1443_h2
#Not Planned
@roadmap_1443_li
#Optimizer: WHERE X=? AND Y IN(?), it always uses the index on Y. Should be cost based.
@roadmap_1444_li
#HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
#Support ALTER SCHEMA name RENAME TO newName (rename schema).
@roadmap_1445_li
#Make the cache scan resistant (currently a small cache is faster than a large cache for large table scans).
@roadmap_1446_h2
#Not Planned
@roadmap_1447_li
#HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
@roadmap_1448_li
#String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@roadmap_1446_li
@roadmap_1449_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.
