ALTER TABLE used a lot of memory when using multi-version concurrency.
Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1003_li
Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
Date values that match the daylight saving time end were not allowed in times zones were the daylight saving time ends at midnight, for years larger than 2037. Example: timezone Brasilia, date 2042-10-12. This is a problem of Java, however a workaround is implemented in H2 that solves most problems (except the problems of java.sql.Date itself).
@changelog_1004_li
New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1005_li
Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1006_li
The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1007_li
Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
@changelog_1008_li
Less heap memory is needed when multiple databases are open at the same time: The memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1009_li
New system property h2.browser to set the browser to use.
Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1010_li
Less heap memory is needed when multiple databases are open at the same time: The memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
@changelog_1011_li
New system property h2.browser to set the browser to use.
@changelog_1012_li
To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1011_h2
@changelog_1013_h2
Version 1.1.102 (2008-10-24)
@changelog_1012_li
@changelog_1014_li
The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1013_li
@changelog_1015_li
There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1014_li
@changelog_1016_li
SET LOG 2 was not effective if executed after opening the database.
@changelog_1015_li
@changelog_1017_li
Translating the H2 Console is now simpler.
@changelog_1016_li
@changelog_1018_li
Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1017_li
@changelog_1019_li
In-memory databases don't write LOBs to files any longer.
@changelog_1018_li
@changelog_1020_li
Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1019_li
@changelog_1021_li
ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1020_li
@changelog_1022_li
Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1021_h2
@changelog_1023_h2
Version 1.1.101 (2008-10-17)
@changelog_1022_li
@changelog_1024_li
Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1023_li
@changelog_1025_li
Queries with more than 10 tables are now faster.
@changelog_1024_li
@changelog_1026_li
Opening a connection with AUTO_SERVER=TRUE is now fast when the database is already open in another process (less than 0.01 seconds instead of 2 seconds).
@changelog_1025_li
@changelog_1027_li
IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1026_li
@changelog_1028_li
The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1027_li
@changelog_1029_li
Linked tables: the automatic connection sharing didn't work. Actually the system property h2.shareLinkedConnections was working in the opposite direction: it was disabled when set to true. Now it works as expected.
@changelog_1028_li
@changelog_1030_li
Opening large database is now faster.
@changelog_1029_li
@changelog_1031_li
New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1030_li
@changelog_1032_li
The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1031_li
@changelog_1033_li
Unset parameters were not detected when the query was re-compiled.
@changelog_1032_li
@changelog_1034_li
New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1033_li
@changelog_1035_li
The date functions DAYOFYEAR, DAYOFMONTH, DAYOFWEEK are now called DAY_OF_YEAR, DAY_OF_MONTH, DAY_OF_WEEK (the old names still work).
@changelog_1034_li
@changelog_1036_li
An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1035_li
@changelog_1037_li
Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1036_li
@changelog_1038_li
Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1037_li
@changelog_1039_li
The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1038_li
@changelog_1040_li
Fulltext search: new method FT_DROP_INDEX.
@changelog_1039_li
@changelog_1041_li
The optimization to group using an index didn't work in some cases in version 1.1 (see also system property h2.optimizeGroupSorted).
@changelog_1040_li
@changelog_1042_li
OSGi meta data is included in the manifest file. An OSGi BundleActivator is included: it loads the database driver when starting the bundle, and unloads it when stopping the bundle.
@changelog_1041_li
@changelog_1043_li
The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1042_li
@changelog_1044_li
For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1043_li
@changelog_1045_li
In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1044_li
@changelog_1046_li
After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1045_li
@changelog_1047_li
Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1046_li
@changelog_1048_li
RUNSCRIPT no longer uses a temporary file.
@changelog_1047_li
@changelog_1049_li
New system table INFORMATION_SCHEMA.SESSION_STATE containing the SQL statements that make up the session state. The list currently contains variables (SET @..) and local temporary tables (without data).
@changelog_1048_li
@changelog_1050_li
After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1049_li
@changelog_1051_li
The build didn't work if the directory temp didn't exist before.
@changelog_1050_li
@changelog_1052_li
New system property h2.maxReconnect (default 3) to limit the number of re-connects for the same SQL statement (this is usually only important for SHUTDOWN).
@changelog_1051_li
@changelog_1053_li
WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1052_li
@changelog_1054_li
Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1053_h2
@changelog_1055_h2
Version 1.1.100 (2008-10-04)
@changelog_1054_li
@changelog_1056_li
In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1055_li
@changelog_1057_li
The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1056_li
@changelog_1058_li
The H2 Console tool now supports command line options to start things separately.
@changelog_1057_li
@changelog_1059_li
Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1058_li
@changelog_1060_li
Connections from a local address other than 'localhost' were not allowed if remote connections were disabled. This was always a problem, but only got visible in the last release because the server no longer connects to 'localhost' if networked.
@changelog_1059_li
@changelog_1061_li
The h2console.war can now be built using the Java build.
@changelog_1060_li
@changelog_1062_li
By default, databases are shared in the same process. For read-only databases this causes unnecessary synchronization, but safes memory. If you want that each connection opens its own database, append ;OPEN_NEW=TRUE to the database URL.
@changelog_1061_li
@changelog_1063_li
New auto-reconnect feature will cause the JDBC driver to reconnect to the database if the connection is lost. To enable, append ;AUTO_RECONNECT=TRUE to the database URL. This is specially helpful when using AUTO_SERVER. AUTO_SERVER automatically uses auto-reconnect.
@changelog_1062_li
@changelog_1064_li
CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1063_li
@changelog_1065_li
The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1064_li
@changelog_1066_li
Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1065_h2
@changelog_1067_h2
Version 1.0.79 (2008-09-26)
@changelog_1066_li
@changelog_1068_li
Linked tables that point to the same database can now share the connection within the same database. Access to the same connection is serialized. To enable this feature, set the system property h2.shareLinkedConnections to true.
@changelog_1067_li
@changelog_1069_li
Multiple processes can now access the same database without having to explicitly start the server. To do that, append ;AUTO_SERVER=TRUE to the database URL. In this case, the server is started automatically if the connection is in embedded mode, and the server mode is used if a server is running. If the process that opened the first connection is closed, the other client need to reconnect (there is no automatic re-connect so far). Remote connections are allowed, but only to this database.
@changelog_1068_li
@changelog_1070_li
The server tool now displays the correct IP address if networked.
@changelog_1069_li
@changelog_1071_li
Can now start a TCP server with port 0 (automatically select a port).
@changelog_1070_li
@changelog_1072_li
Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1071_li
@changelog_1073_li
LINKED TABLE: the schema name can now be set. When multiple tables exist in different schema, and the schema name is not set, an exception is thrown.
@changelog_1072_li
@changelog_1074_li
LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1073_li
@changelog_1075_li
Faster hash code calculation for large binary arrays.
@changelog_1074_li
@changelog_1076_li
Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1075_li
@changelog_1077_li
The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1076_li
@changelog_1078_li
The H2 Console now abbreviates large texts in results.
@changelog_1077_li
@changelog_1079_li
Multiple UNION queries could not be used in derived tables.
@changelog_1078_li
@changelog_1080_li
Linked tables can now be read-only.
@changelog_1079_li
@changelog_1081_li
Temporary linked tables are now supported.
@changelog_1080_li
@changelog_1082_li
It was possible to create tables in read-only databases.
@changelog_1081_li
@changelog_1083_li
SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1082_li
@changelog_1084_li
SET SCHEMA did not work for views.
@changelog_1083_li
@changelog_1085_li
Row level locking for MVCC is now enabled. The exception 'Concurrent update in table ...' is still thrown, but only after the lock timeout.
@changelog_1084_li
@changelog_1086_li
The maximum log file size setting was ignored for large databases.
@changelog_1085_li
@changelog_1087_li
Multi-Version Concurrency (MVCC) may no longer be used when using the multi-threaded kernel feature (MULTI_THREADED). An exception is thrown when trying to connect with both settings. Additional synchronization is required before those features can be used together.
@changelog_1086_li
@changelog_1088_li
The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1087_li
@changelog_1089_li
The system property h2.optimizeInJoin did not work correctly.
@changelog_1088_li
@changelog_1090_li
Conditions such as ID=? AND ID>? were slow.
@changelog_1089_h2
@changelog_1091_h2
Version 1.0.78 (2008-08-28)
@changelog_1090_li
@changelog_1092_li
The documentation no longer uses a frameset (except the Javadocs).
@changelog_1091_li
@changelog_1093_li
When using DB_CLOSE_DELAY, sometimes a NullPointerException is thrown when the database is opened almost at the same time as it is closed automatically. Thanks a lot to Dmitry Pekar for finding this!
@changelog_1092_li
@changelog_1094_li
Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1093_li
@changelog_1095_li
The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1094_li
@changelog_1096_li
The H2 Console replaced an empty user name with a single space.
@changelog_1095_li
@changelog_1097_li
The build target 'build jarSmall' now includes the embedded database.
@changelog_1096_li
@changelog_1098_li
JdbcDataSource now keeps the password in a char array where possible.
@changelog_1097_li
@changelog_1099_li
ResultSet.absolute did not always work with large result sets.
@changelog_1098_li
@changelog_1100_li
Column aliases can now be used in GROUP BY and HAVING.
@changelog_1099_li
@changelog_1101_li
Jason Brittain has contributed MySQL date functions. Thanks a lot! They are not in the h2.jar file currently, but in src/tools/org/h2/mode/FunctionsMySQL.java. To install, add this class to the classpath and call FunctionsMySQL.register(conn) in the Java code.
@changelog_1100_h2
@changelog_1102_h2
Version 1.0.77 (2008-08-16)
@changelog_1101_li
@changelog_1103_li
JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1102_li
@changelog_1104_li
When using remote in-memory databases, large LOB objects did not work.
@changelog_1103_li
@changelog_1105_li
Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1104_li
@changelog_1106_li
Opening a large database was slow if there was a problem opening the previous time.
@changelog_1105_li
@changelog_1107_li
NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1106_li
@changelog_1108_li
CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1107_li
@changelog_1109_li
Support a comma before closing a list, as in: create table test(id int,)
@changelog_1108_li
@changelog_1110_li
MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1109_li
@changelog_1111_li
DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1110_li
@changelog_1112_li
Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1111_li
@changelog_1113_li
ResultSet.setFetchSize is now supported.
@changelog_1112_li
@changelog_1114_li
It has been reported that when using Install4j on some Linux systems and enabling the 'pack200' option, the h2.jar becomes corrupted by the install process, causing application failure. A workaround is to add an empty file h2.jar.nopack next to the h2.jar file. The reason for this problem is not known.
@changelog_1113_h2
@changelog_1115_h2
Version 1.0.76 (2008-07-27)
@changelog_1114_li
@changelog_1116_li
The comment of a domain (user defined data type) is now used as the default column comment when creating a column with this domain.
@changelog_1115_li
@changelog_1117_li
Invalid database names are now detected and a better error message is thrown.
@changelog_1116_li
@changelog_1118_li
ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1117_li
@changelog_1119_li
Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1118_li
@changelog_1120_li
There is a problem with Hibernate when using Boolean columns. A patch for Hibernate has been submitted at http://opensource.atlassian.com/projects/hibernate/browse/HHH-3401
@changelog_1119_li
@changelog_1121_li
ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1120_li
@changelog_1122_li
H2 Console: The progress display when opening a database has been improved.
@changelog_1121_li
@changelog_1123_li
The error message when the server doesn't start has been improved.
@changelog_1122_li
@changelog_1124_li
Key values can now be changed in updatable result sets.
@changelog_1123_li
@changelog_1125_li
Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1124_li
@changelog_1126_li
Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1125_li
@changelog_1127_li
The database file was growing after deleting many rows, and after large update operations.
@changelog_1126_h2
@changelog_1128_h2
Version 1.0.75 (2008-07-14)
@changelog_1127_li
@changelog_1129_li
Multi version concurrency (MVCC): when a row was updated or deleted, but this change was rolled back, the row was not visible by other sessions if no index was used to access it. Fixed.
@changelog_1128_li
@changelog_1130_li
Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1129_li
@changelog_1131_li
The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1130_li
@changelog_1132_li
Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1131_li
@changelog_1133_li
Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1132_li
@changelog_1134_li
When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1133_li
@changelog_1135_li
Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1134_li
@changelog_1136_li
Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1135_li
@changelog_1137_li
The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1136_li
@changelog_1138_li
The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1137_li
@changelog_1139_li
The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1138_li
@changelog_1140_li
Stopping a WebServer didn't always work. Fixed.
@changelog_1139_h2
@changelog_1141_h2
Version 1.0.74 (2008-06-21)
@changelog_1140_li
@changelog_1142_li
Work on row level locking has been started (but there is nothing usable yet).
@changelog_1141_li
@changelog_1143_li
JaQu (Java Query), a tool similar to LINQ (Language Integrated Query; from Microsoft) is now included under src/tools/org/h2/jaqu. A small sample application is included under src/test/org/h2/test/jaqu.
@changelog_1142_li
@changelog_1144_li
The source code is now switched to Java 1.6 by default. To switch back to Java 1.4, run 'build compile'. The h2.jar file is still Java 1.4.
@changelog_1143_li
@changelog_1145_li
The ChangePassword tool is now called ChangeFileEncryption.
@changelog_1144_li
@changelog_1146_li
It is no longer allowed to create columns with the data type NULL. Also, it is no longer allowed to convert a column to the data type NULL. This was possible before but caused data loss.
@changelog_1145_li
@changelog_1147_li
When using computed columns or default values with a different data type than the column data type, a class cast exception could occur. Fixed.
@changelog_1146_li
@changelog_1148_li
Opening databases larger than 1 GB was sometimes very slow if a lot of data was deleted previously. Fixed.
@changelog_1147_li
@changelog_1149_li
RUNSCRIPT could throw a NullPointerException if the script name was an expression.
@changelog_1148_li
@changelog_1150_li
Improved compatibility. New compatibility modes for Oracle and Derby. New compatibility flag uniqueIndexNullDistinct to only allow one row with 'NULL' in a unique index. This flag is enabled for Derby, Oracle, MSSQLServer, and HSQLDB.
@changelog_1149_li
@changelog_1151_li
Linked tables: To view the statements that are executed against the target table, set the trace level to 3.
@changelog_1150_li
@changelog_1152_li
RunScript tool: new options to show and check the results of queries.
@changelog_1151_li
@changelog_1153_li
Deadlocks are now detected. One transaction is rolled back automatically.
@changelog_1152_li
@changelog_1154_li
The Lucene fulltext index was always re-created when opening a database with fulltext index enabled.
@changelog_1153_li
@changelog_1155_li
Support for overloaded Java methods. A user defined function can now be bound to multiple Java methods, if the Java methods have the same name but a different number of parameters. Thanks to Gary Tong for providing a patch!
@changelog_1154_h2
@changelog_1156_h2
Version 1.0.73 (2008-05-31)
@changelog_1155_li
@changelog_1157_li
ParameterMetaData now returns the right data type for most conditions, as in WHERE ID=?.
@changelog_1156_li
@changelog_1158_li
The table SYSTEM_RANGE now supports expressions and parameters.
@changelog_1157_li
@changelog_1159_li
New column INFORMATION_SCHEMA.CONSTRAINTS.UNIQUE_INDEX_NAME that contains the name of the unique index used to enforce this constraint, if there is such an index.
@changelog_1158_li
@changelog_1160_li
SET QUERY_TIMEOUT and Statement.setQueryTimeout no longer commits a transaction. The same applies to SET @VARIABLE, SET LOCK_TIMEOUT, SET TRACE_LEVEL_*, SET THROTTLE, and SET PATH.
@changelog_1159_li
@changelog_1161_li
The SCRIPT command does now emit IF NOT EXISTS for CREATE ROLE.
@changelog_1160_li
@changelog_1162_li
MySQL compatibility: auto_increment column are no longer automatically converted to primary key columns.
@changelog_1161_li
@changelog_1163_li
PostgreSQL compatibility: support for BOOL_OR and BOOL_AND aggregate functions.
@changelog_1162_li
@changelog_1164_li
Negative scale values for DECIMAL or NUMBER columns are now supported in regular tables and in linked tables.
@changelog_1163_li
@changelog_1165_li
A role or right can now be granted or revoked multiple times without getting an exception.
@changelog_1164_li
@changelog_1166_li
Infinite numbers in SQL scripts are listed as POWER(0, -1)), negative infinite as (-POWER(0, -1)), and NaN (not a number) as SQRT(-1).
@changelog_1165_li
@changelog_1167_li
The special double and float values 'NaN' (not a number) did not work correctly when sorting or comparing.
@changelog_1166_li
@changelog_1168_li
The fulltext search did not support CLOB data types.
@changelog_1167_li
@changelog_1169_li
If the drive with the database files was disconnected or unmounted while writing, sometimes a stack overflow exception was thrown instead of a IO exception.
@changelog_1168_li
@changelog_1170_li
The H2 Console could not be shut down from within the tool if the browser supports keepAlive (most browsers do).
@changelog_1169_li
@changelog_1171_li
If the password was passed as a char array, it was kept in an internal buffer longer than required. Theoretically the password could have been stolen if the main memory was swapped to disk before the garbage collection was run.
@changelog_1170_h2
@changelog_1172_h2
Version 1.0.72 (2008-05-10)
@changelog_1171_li
@changelog_1173_li
Some databases could not be opened when appending ;RECOVER=1 to the database URL.
@changelog_1172_li
@changelog_1174_li
The Japanese translation of the error messages and the H2 Console has been completed by Masahiro Ikemoto (Arizona Design Inc.)
@changelog_1173_li
@changelog_1175_li
Updates made to updatable rows are now visible within the same result set. DatabaseMetaData.ownUpdatesAreVisible now returns true.
@changelog_1174_li
@changelog_1176_li
ParameterMetaData now returns the correct data for INSERT and UPDATE statements.
@changelog_1175_li
@changelog_1177_li
H2 Shell: DESCRIBE now supports an schema name.
@changelog_1176_li
@changelog_1178_li
A subset of the PostgreSQL 'dollar quoting' feature is now supported.
@changelog_1177_li
@changelog_1179_li
SLF4J is now supported by using adding TRACE_LEVEL_FILE=4 to the database URL.
@changelog_1178_li
@changelog_1180_li
The recovery tool did not work if the table name contained spaces or if there was a comment on the table.
@changelog_1179_li
@changelog_1181_li
Triggers are no longer executed when changing the table structure (ALTER TABLE).
@changelog_1180_li
@changelog_1182_li
When setting BLOB or CLOB values larger than 65 KB using a remote connection, temporary files were kept on the client longer than required (until the connection was closed or the object is garbage collected). Now they are removed as soon as the PreparedStatement is closed, or when the value is overwritten.
@changelog_1181_li
@changelog_1183_li
Statements can now be canceled remotely (when using remote connections).
@changelog_1182_li
@changelog_1184_li
The Shell tool now uses java.io.Console to read the password when using JDK 1.6
@changelog_1183_li
@changelog_1185_li
When using read-only databases and setting LOG=2, an exception was written to the trace file when closing the database. Fixed.
@changelog_1184_h2
@changelog_1186_h2
Version 1.0.71 (2008-04-25)
@changelog_1185_li
@changelog_1187_li
H2 is now dual-licensed under the Eclipse Public License (EPL) and the old 'H2 License' (which is basically MPL).
@changelog_1186_li
@changelog_1188_li
Sometimes an exception 'File ID mismatch' or 'try to add a record twice' occurred after large records (8 KB or larger) are updated or deleted. See also http://code.google.com/p/h2database/issues/detail?id=22
@changelog_1187_li
@changelog_1189_li
H2 Console: The tools can now be translated (it didn't work in the last release).
@changelog_1188_li
@changelog_1190_li
New traditional Chinese translation. Thanks a lot to Derek Chao!
@changelog_1189_li
@changelog_1191_li
Indexes were not used when enabling the optimization for IN(SELECT...) (system property h2.optimizeInJoin).
@changelog_1190_h2
@changelog_1192_h2
Version 1.0.70 (2008-04-20)
@changelog_1191_li
@changelog_1193_li
The plan is to dual-license H2. The additional license is EPL (Eclipse Public License). The current license (MPL, Mozilla Public License) will stay. Current users are not affected because they can keep MPL. EPL is very similar to MPL, the only bigger difference is related to patents (EPL is a bit more business friendly in this regard). See also http://opensource.org/licenses/eclipse-1.0.php, http://www.eclipse.org/legal/eplfaq.php (FAQ), http://blogs.zdnet.com/Burnette/?p=131
@changelog_1192_li
@changelog_1194_li
Multi version concurrency (MVCC): when a row was updated, and the updated column was not indexed, this update was visible sometimes for other sessions even if it was not committed.
@changelog_1193_li
@changelog_1195_li
Calling SHUTDOWN on one connection and starting a query on another connection concurrently could result in a Java level deadlock.
@changelog_1194_li
@changelog_1196_li
New system property h2.enableAnonymousSSL (default: true) to enable anonymous SSL connections.
@changelog_1195_li
@changelog_1197_li
The precision if SUBSTR is now calculated if possible.
@changelog_1196_li
@changelog_1198_li
The autocomplete in the H2 Console has been improved a bit.
@changelog_1197_li
@changelog_1199_li
The tools in the H2 Console are now translatable.
@changelog_1198_li
@changelog_1200_li
The servlet and lucene jar files are now automatically downloaded when building.
@changelog_1199_li
@changelog_1201_li
The code switch tool has been replaced by a simpler tool called SwitchSource that just uses find and replace.
@changelog_1200_li
@changelog_1202_li
Started to write a Ant replacement ('JAnt') that uses pure Java build definitions. Advantages: ability to debug the build, extensible, flexible, no XML, a bit faster. Future plan: support creating custom h2 distributions (for embedded use). Maybe create a new project 'Jant' or 'Javen' if other people are interested.
@changelog_1201_li
@changelog_1203_li
The jar file is now about 10% smaller because the variable debugging info is no longer included. The source file and line number debugging info is still included. If required, the jar file size of the full version can be further reduced to about 720 KB using 'build jarSmall' or even more by removing unneeded components.
@changelog_1202_li
@changelog_1204_li
Added shell scripts run.sh and build.sh. chmod +x is required, but otherwise it should work. Feedback or improvements are welcome!
@changelog_1203_li
@changelog_1205_li
Databases in zip files: large queries are now supported. Temp files are created in the temp directory if required. The documentation how to create the zip file has been corrected.
The Japanese translation of the error messages and the H2 Console has been improved. Thanks a lot to Masahiro IKEMOTO.
@changelog_1206_li
@changelog_1208_li
Optimization for MIN() and MAX() when using MVCC.
@changelog_1207_li
@changelog_1209_li
To protect against remote brute force password attacks, the delay after each unsuccessful login now gets double as long. New system properties h2.delayWrongPasswordMin and h2.delayWrongPasswordMax.
@changelog_1208_li
@changelog_1210_li
After setting the query timeout and then resetting it, the next query would still timeout. Fixed.
@changelog_1209_li
@changelog_1211_li
Adding a IDENTITY column to a table with data threw a lock timeout.
@changelog_1210_li
@changelog_1212_li
OutOfMemoryError could occur when using EXISTS or IN(SELECT ..).
@changelog_1211_li
@changelog_1213_li
The built-in connection pool is not called JdbcConnectionPool. The API and documentation has been changed.
@changelog_1212_li
@changelog_1214_li
The ConvertTraceFile tool now generates SQL statement statistics at the end of the SQL script file (similar to the profiling data generated when using java -Xrunhprof).
@changelog_1213_li
@changelog_1215_li
Nested joins are now supported (A JOIN B JOIN C ON .. ON ..)
@changelog_1214_h2
@changelog_1216_h2
Version 1.0.69 (2008-03-29)
@changelog_1215_li
@changelog_1217_li
Most command line tools can now be called from within the H2 Console.
@changelog_1216_li
@changelog_1218_li
A new Shell tools is now included (org.h2.tools.Shell) to query a database from the command line.
@changelog_1217_li
@changelog_1219_li
The command line options in the tools have changed: instead of '-log true' now '-trace' is used. Also, '-ifExists', '-tcpSSL' and '-tcpAllowOthers' and so on have changed: now the 'true' is no longer needed. The old behavior is still supported.
@changelog_1218_li
@changelog_1220_li
New system property h2.sortNullsHigh to invert the default sorting behavior for NULL. The default didn't change.
@changelog_1219_li
@changelog_1221_li
Performance was very slow when using LOG=2 and deleting or updating all rows of a table in a loop. Fixed.
@changelog_1220_li
@changelog_1222_li
ALTER TABLE or CREATE TABLE now support parameters for the password field.
@changelog_1221_li
@changelog_1223_li
The linear hash has been removed. It was always slower than the b-tree index, and there were some bugs that would be hard to fix.
@changelog_1222_li
@changelog_1224_li
TRACE_LEVEL_ settings are no longer persistent. This was a problem when database initialization code caused a lot of trace output.
@changelog_1223_li
@changelog_1225_li
Fulltext search (native implementation): The words table is no longer an in-memory table because this caused memory problems in some cases.
@changelog_1224_li
@changelog_1226_li
It was possible to create a role with the name as an existing user (but not vice versa). This is not allowed any more.
@changelog_1225_li
@changelog_1227_li
The recovery tool didn't work correctly for tables without rows.
@changelog_1226_li
@changelog_1228_li
For years below 1, the YEAR method didn't return the correct value, and the conversion from date and timestamp to varchar was incorrect.
@changelog_1227_li
@changelog_1229_li
CSVWRITE caused a NullPointerException when not specifying a nullString.
@changelog_1228_li
@changelog_1230_li
When a log file switch occurred just after a truncate table or drop table statement, the database could not be started normally (RECOVER=1 was required). Fixed.
@changelog_1229_li
@changelog_1231_li
When a log file switch occurred in the middle of a sequence flush (sequences are only flushed every 32 values by default), the sequence value was lost. Fixed.
@changelog_1230_li
@changelog_1232_li
Altering a sequence didn't unlock the system table when autocommit switched off.
@changelog_1231_h2
@changelog_1233_h2
Version 1.0.68 (2008-03-18)
@changelog_1232_li
@changelog_1234_li
Very large SELECT DISTINCT and UNION EXCEPT queries are now supported, however this feature is disabled by default. To enable it, set the system property h2.maxMemoryRowsDistinct to a lower value, for example 10000.
@changelog_1233_li
@changelog_1235_li
A error is now thrown when trying to call a method inside a trigger that implicitly commits the current transaction, if an object is locked.
@changelog_1234_li
@changelog_1236_li
Unused LOB files were deleted much too late. Now they are deleted if no longer referenced in memory.
@changelog_1235_li
@changelog_1237_li
ALTER SEQUENCE and ALTER TABLE ALTER COLUMN RESTART can now be used inside a transaction.
@changelog_1236_li
@changelog_1238_li
New system property h2.aliasColumnName. When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the real table and column name in ResultSetMetaData.getTableName() and getColumnName(). This is disabled by default for compatibility with other databases (HSQLDB, Apache Derby, PostgreSQL, some version of MySQL). In version 1.1 this setting will be enabled.
@changelog_1237_li
@changelog_1239_li
When using encrypted databases, and using the wrong file password, the log file was renamed if the database was not already open. Fixed.
@changelog_1238_li
@changelog_1240_li
Improved performance when using lob files in directories (however this is still disabled by default)
@changelog_1239_li
@changelog_1241_li
H2 Console: autocomplete didn't work with very large scripts. Fixed.
@changelog_1240_li
@changelog_1242_li
Fulltext search: new method SEARCH_DATA that returns the column names and primary keys as arrays.
@changelog_1241_li
@changelog_1243_li
New experimental optimization for GROUP BY queries if an index can be used that matches the group by columns. To enable this optimization, set the system property h2.optimizeGroupSorted to true.
@changelog_1242_li
@changelog_1244_li
When using multi-version concurrency (MVCC=TRUE), duplicate rows could appear in the result set when running queries with uncommitted changes in the same session.
@changelog_1243_li
@changelog_1245_li
H2 Console: remote connections were very slow because getHostName/getRemoteHost was used. Fixed (now using getHostAddress/getRemoteAddr.
@changelog_1244_li
@changelog_1246_li
H2 Console: on Linux, Firefox, Konqueror, or Opera (in this order) are now started if available. This has been tested on Ubuntu.
@changelog_1245_li
@changelog_1247_li
H2 Console: the start window works better with IKVM
@changelog_1246_li
@changelog_1248_li
H2 Console: improved compatibility with Safari (Safari requires keep-alive)
@changelog_1247_li
@changelog_1249_li
Random: the process didn't stop if generating the random seed using the standard way (SecureRandom.generateSeed) was very slow. Now using a daemon thread to avoid this problem.
@changelog_1248_li
@changelog_1250_li
SELECT UNION with a different number of ORDER BY columns did throw an ArrayIndexOutOfBoundsException.
@changelog_1249_li
@changelog_1251_li
When using a view, the column precision was changed to the default scale for some data types.
@changelog_1250_li
@changelog_1252_li
CSVWRITE now supports a 'null string' that is used for parsing and writing NULL.
@changelog_1251_li
@changelog_1253_li
Some long running queries could not be canceled.
@changelog_1252_li
@changelog_1254_li
Queries with many outer join tables were very slow. Fixed.
@changelog_1253_li
@changelog_1255_li
The performance of text comparison has been improved when using locale sensitive string comparison (SET COLLATOR). Now CollationKey is used with a LRU cache. The default cache size is 10000, and can be changed using the system property h2.collatorCacheSize. Use 0 to disable the cache.
@changelog_1254_li
@changelog_1256_li
UPDATE SET column=DEFAULT is now supported.
@changelog_1255_h2
@changelog_1257_h2
Version 1.0.67 (2008-02-22)
@changelog_1256_li
@changelog_1258_li
New function FILE_READ to read a file or from an URL. Both binary and text data is supported.
@changelog_1257_li
@changelog_1259_li
CREATE TABLE AS SELECT now supports specifying the column list and data types.
@changelog_1258_li
@changelog_1260_li
Connecting to a TCP server and at shutting it down at the same time could cause a Java level deadlock.
@changelog_1259_li
@changelog_1261_li
A user now has all rights on his own local temporary tables.
@changelog_1260_li
@changelog_1262_li
The CSV tool now supports a custom lineSeparator.
@changelog_1261_li
@changelog_1263_li
When using multiple connections, empty space was reused too early sometimes. This could corrupt the database when recovering.
@changelog_1262_li
@changelog_1264_li
The H2 Console has been translated to Dutch. Thanks a lot to Remco Schoen!
@changelog_1263_li
@changelog_1265_li
Databases can now be opened even if trigger classes are not in the classpath. The exception is thrown when trying to fire the trigger.
@changelog_1264_li
@changelog_1266_li
Opening databases with ACCESS_MODE_DATA=r is now supported. In this case the database is read-only, but the files don't not need to be read-only.
@changelog_1265_li
@changelog_1267_li
Security: The database now waits 200 ms before throwing an exception if the user name or password don't match, to slow down dictionary attacks.
@changelog_1266_li
@changelog_1268_li
The value cache is now a soft reference cache. This should help save memory.
@changelog_1267_li
@changelog_1269_li
CREATE INDEX on a table with many rows could run out of memory. Fixed.
@changelog_1268_li
@changelog_1270_li
Large result sets are now a bit faster.
@changelog_1269_li
@changelog_1271_li
ALTER TABLE ALTER COLUMN RESTART and ALTER SEQUENCE now support parameters (any expressions).
@changelog_1270_li
@changelog_1272_li
When setting the base directory on the command line, the user directory prefix ('~') was ignored.
@changelog_1271_li
@changelog_1273_li
The DbStarter servlet didn't start the TCP listener even if configured.
@changelog_1272_li
@changelog_1274_li
Statement.setQueryTimeout() is now supported.
@changelog_1273_li
@changelog_1275_li
New session setting QUERY_TIMEOUT, and new system property h2.maxQueryTimeout.
@changelog_1274_li
@changelog_1276_li
Changing the transaction log level (SET LOG) is now written to the trace file by default.
@changelog_1275_li
@changelog_1277_li
In a SQL script, primary key constraints are now ordered before foreign key constraints.
@changelog_1276_li
@changelog_1278_li
It was not possible to create a referential constraint to a table in a different schema in some situations.
@changelog_1277_li
@changelog_1279_li
The H2 Console was slow when the database contains many tables. Now the column names are not shown in this case.
@changelog_1278_h2
@changelog_1280_h2
Version 1.0.66 (2008-02-02)
@changelog_1279_li
@changelog_1281_li
There is a new online error analyzer tool.
@changelog_1280_li
@changelog_1282_li
H2 Console: stack traces are now links to the source code in the source repository (H2 database only).
@changelog_1281_li
@changelog_1283_li
CHAR data type equals comparison was case insensitive instead of case sensitive.
@changelog_1282_li
@changelog_1284_li
The exception 'Value too long for column' now includes the data.
@changelog_1283_li
@changelog_1285_li
The table name was missing in the documentation of CREATE INDEX.
@changelog_1284_li
@changelog_1286_li
Better support for IKVM (www.ikvm.net): the H2 Console now opens a browser window.
@changelog_1285_li
@changelog_1287_li
The cache size was not correctly calculated for tables with large objects (specially if compression is used). This could lead to out-of-memory exceptions.
@changelog_1286_li
@changelog_1288_li
The exception "Hexadecimal string contains non-hex character" was not always thrown when it should have been. Fixed.
@changelog_1287_li
@changelog_1289_li
The H2 Console now provides a link to the documentation when an error occurs (H2 databases only so far).
@changelog_1288_li
@changelog_1290_li
The acting as PostgreSQL server, when a base directory was set, and the H2 Console was started as well, the base directory was applied twice.
@changelog_1289_li
@changelog_1291_li
Calling EXTRACT(HOUR FROM ...) or EXTRACT(HH FROM ...) returned the wrong values (0 to 11 instead of 0 to 23). All other tested databases return values from 0 to 23. Please check if your application relies on the old behavior before upgrading.
@changelog_1290_li
@changelog_1292_li
For compatibility with other databases the column default (COLUMN_DEF) for columns without default is now null (it was an empty string).
@changelog_1291_li
@changelog_1293_li
Statements that contain very large subqueries (where the subquery result does not fit in memory) are now faster.
@changelog_1292_li
@changelog_1294_li
Variables: large objects (CLOB and BLOB) that don't fit in memory did not work correctly when used as variables.
@changelog_1293_li
@changelog_1295_li
Fulltext search is now supported in named in-memory databases.
@changelog_1294_li
@changelog_1296_li
H2 Console: multiple consecutive spaces in the setting name did not work. Fixed.
@changelog_1295_h2
@changelog_1297_h2
Version 1.0.65 (2008-01-18)
@changelog_1296_li
@changelog_1298_li
The build (ant) now automatically switches the source code to the correct version (JDK 1.4/1.5 or 1.6).
@changelog_1297_li
@changelog_1299_li
A recovery bug has been fixed. With older versions, it was necessary to add ;RECOVER=1 to the database URL in cases where it should not have been required.
@changelog_1298_li
@changelog_1300_li
The performance for DROP and DROP ALL OBJECTS has been improved.
@changelog_1299_li
@changelog_1301_li
The ChangePassword API has been improved.
@changelog_1300_li
@changelog_1302_li
User defined variables are now supported. Examples: SET @VAR=10;CALL @VAR. This can be used for running totals as in: select x, set(@t, ifnull(@t, 0) + x) from system_range(1, 10)
@changelog_1301_li
@changelog_1303_li
The Ukrainian translation has been improved.
@changelog_1302_li
@changelog_1304_li
CALL statements can now be used in batch updates and called using Statement.executeUpdate.
@changelog_1303_li
@changelog_1305_li
New read-only setting CREATE_BUILD (the build number of the database engine that created the database).
@changelog_1304_li
@changelog_1306_li
The optimizer did not use multi column indexes for range queries in some cases. Fixed.
@changelog_1305_li
@changelog_1307_li
The H2 Console now calls DataSource.getConnection() instead of DataSource.getConnection(user, password) when user name and password are not specified.
@changelog_1306_li
@changelog_1308_li
The bind IP address can now be set when using multi-homed host (if multiple network adapters are available) using the system property h2.bindAddress.
@changelog_1307_li
@changelog_1309_li
Batch update: Calling BatchUpdateException.printStackTrace() could result in out of memory. Fixed.
@changelog_1308_li
@changelog_1310_li
Indexes of unique or foreign constraints where not dropped when the constraint was dropped after altering the table (for example dropping a column). Fixed.
@changelog_1309_li
@changelog_1311_li
The performance for large result sets in the server mode has been improved.
@changelog_1310_li
@changelog_1312_li
The setting h2.serverSmallResultSetSize has been renamed to h2.serverResultSetFetchSize.
@changelog_1311_li
@changelog_1313_li
The SCRIPT command now uses multi-row insert statements to save space except if the option SIMPLE is used.
@changelog_1312_li
@changelog_1314_li
The SCRIPT command did not split up CLOB data correctly. Fixed.
@changelog_1313_li
@changelog_1315_li
Optimization for single column distinct queries with an index: select distinct name from test. Can be disabled by setting the system property h2.optimizeDistinct to false.
@changelog_1314_li
@changelog_1316_li
DROP ALL OBJECTS did not drop user defined aggregate functions and domains.
@changelog_1315_li
@changelog_1317_li
PostgreSQL compatibility: COUNT(T.*) is now supported.
@changelog_1316_li
@changelog_1318_li
LIKE comparisons are now faster.
@changelog_1317_li
@changelog_1319_li
Encrypted databases are now faster.
@changelog_1318_h2
@changelog_1320_h2
Version 1.0.64 (2007-12-27)
@changelog_1319_li
@changelog_1321_li
3-way union queries with prepared statement or views could return the wrong results. Fixed.
@changelog_1320_li
@changelog_1322_li
The PostgreSQL ODBC driver did not work in the last release due to a parser regression. Fixed.
@changelog_1321_li
@changelog_1323_li
CSV tool: some escape/separator character combinations did not work. Fixed.
@changelog_1322_li
@changelog_1324_li
CSV tool: the character # could not be used as a separator when reading.
@changelog_1323_li
@changelog_1325_li
Recovery: when the index file is corrupt, now the database deletes it and re-creates it automatically.
@changelog_1324_li
@changelog_1326_li
The MVCC mode did not work well with in-memory databases. Fixed.
@changelog_1325_li
@changelog_1327_li
The FTP server now supports a event listener. Thanks Fulvio Biondi for the help!
@changelog_1326_li
@changelog_1328_li
New system function CANCEL_SESSION to cancel the currently executing statement of another session.
@changelog_1327_li
@changelog_1329_li
The database now supports an exclusive mode. In exclusive mode, new connections are rejected.
@changelog_1328_li
@changelog_1330_li
H2 Console: when editing result sets, columns can now be set to null. The text 'null' must be escaped using '=null'.
@changelog_1329_li
@changelog_1331_li
New built-in functions RPAD and LPAD.
@changelog_1330_li
@changelog_1332_li
New meta data table INFORMATION_SCHEMA.SESSIONS and LOCKS to get information about active connections and locks. Admins will see all connections, non-admins only their own session.
@changelog_1331_li
@changelog_1333_li
The Ukrainian translation was not working in the last release. Fixed.
@changelog_1332_li
@changelog_1334_li
Creating many tables (many hundreds) was slow. Fixed.
@changelog_1333_li
@changelog_1335_li
Opening a database with many indexes (thousands) was slow. Fixed.
@changelog_1334_li
@changelog_1336_li
H2 Console / autocomplete: Ctrl+Space now shows the list in all modes.
@changelog_1335_li
@changelog_1337_li
The method Trigger.init has been changed: the parameters 'before' and 'type', have been added to the init method.
@changelog_1336_li
@changelog_1338_li
The performance has been improved for ResultSet methods with column name.
@changelog_1337_li
@changelog_1339_li
A stack trace was thrown if the system did not provide a quick secure random source and if there is no network or the network settings are not configured. Fixed.
@changelog_1338_li
@changelog_1340_li
The H2 Console has been translated to Turkish. Thanks a lot to Ridvan Agar!
@changelog_1339_li
@changelog_1341_li
Improved debugging support: toString methods of most object now return a meaningful text.
@changelog_1340_li
@changelog_1342_li
The classes DbStarter and WebServlet have been moved to src/main.
@changelog_1341_li
@changelog_1343_li
The column INFORMATION_SCHEMA.TRIGGERS.SQL now contains the CREATE TRIGGER statement.
@changelog_1342_li
@changelog_1344_li
Loading classes and calling methods can be restricted using the new system property h2.allowedClasses.
@changelog_1343_li
@changelog_1345_li
The database could not be used in Java applets due to security exceptions. Fixed.
@download_1000_h1
...
...
@@ -5552,75 +5558,81 @@ SeQuaLite
A free, light-weight, java data access framework released under GPL.
@links_1164_a
Shellbook
ShapeLogic
@links_1165_p
Desktop publishing application.
Toolkit for declarative programming, image processing and computer vision.
@links_1166_a
Signsoft intelliBO
Shellbook
@links_1167_p
Persistence middleware supporting the JDO specification.
Desktop publishing application.
@links_1168_a
SimpleORM
Signsoft intelliBO
@links_1169_p
Simple Java Object Relational Mapping.
Persistence middleware supporting the JDO specification.
@links_1170_a
SmartFoxServer
SimpleORM
@links_1171_p
Platform for developing multiuser applications and games with Macromedia Flash.
Simple Java Object Relational Mapping.
@links_1172_a
StorYBook
SmartFoxServer
@links_1173_p
A summary-based tool for novelist and script writers. It helps to keep the overview over the various traces a story has.
Platform for developing multiuser applications and games with Macromedia Flash.
@links_1174_a
StreamCruncher
StorYBook
@links_1175_p
Event (stream) processing kernel.
A summary-based tool for novelist and script writers. It helps to keep the overview over the various traces a story has.
@links_1176_a
Tamava
StreamCruncher
@links_1177_p
Newsgroups Reader.
Event (stream) processing kernel.
@links_1178_a
Tune Backup
Tamava
@links_1179_p
Easy-to-use backup solution for your iTunes library.
Newsgroups Reader.
@links_1180_a
weblica
Tune Backup
@links_1181_p
Desktop CMS.
Easy-to-use backup solution for your iTunes library.
@links_1182_a
Web of Web
weblica
@links_1183_p
Collaborative and realtime interactive media platform for the web.
Desktop CMS.
@links_1184_a
Werkzeugkasten
Web of Web
@links_1185_p
Minimum Java Toolset.
Collaborative and realtime interactive media platform for the web.
@links_1186_a
Volunteer database
Werkzeugkasten
@links_1187_p
Minimum Java Toolset.
@links_1188_a
Volunteer database
@links_1189_p
A database front end to register volunteers, partnership and donation for a Non Profit organization.
@mainWeb_1000_h1
...
...
@@ -8119,13 +8131,16 @@ ANALYZE: For unique indexes that allow null, count the number of null.
@roadmap_1353_li
AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
@roadmap_1354_h2
@roadmap_1354_li
Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
@roadmap_1355_h2
Not Planned
@roadmap_1355_li
@roadmap_1356_li
HSQLDB (did) support this: select id i from test where i>0 (other databases don't). Supporting it may break compatibility.
@roadmap_1356_li
@roadmap_1357_li
String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@search_1000_b
...
...
@@ -8560,300 +8575,312 @@ By default the DbStarter listener opens an embedded connection using the databas
@tutorial_1106_p
When the web application is stopped, the database connection will be closed automatically. If the server is started within the DbStarter, it will also be stopped automatically when the web application is stopped.
@tutorial_1107_h2
CSV (Comma Separated Values) Support
@tutorial_1107_h3
Using the H2 Console Servlet
@tutorial_1108_p
The H2 Console is a standalone application and includes its own web server, but it can be used as a servlet as well. To do that, include the the h2 jar file in your application, and add the following configuration to your web.xml:
@tutorial_1109_p
For details, see also <code>src/tools/WEB-INF/web.xml</code> .
@tutorial_1110_p
To create a web application that creates just the H2 Console, run the following command:
@tutorial_1111_h2
CSV (Comma Separated Values) Support
@tutorial_1112_p
The CSV file support can be used inside the database using the functions CSVREAD and CSVWRITE, and the CSV library can be used outside the database as a standalone tool.
@tutorial_1109_h3
@tutorial_1113_h3
Writing a CSV File from Within a Database
@tutorial_1110_p
@tutorial_1114_p
The built-in function CSVWRITE can be used to create a CSV file from a query. Example:
@tutorial_1111_h3
@tutorial_1115_h3
Reading a CSV File from Within a Database
@tutorial_1112_p
@tutorial_1116_p
A CSV file can be read using the function CSVREAD. Example:
@tutorial_1113_h3
@tutorial_1117_h3
Writing a CSV File from a Java Application
@tutorial_1114_p
@tutorial_1118_p
The CSV tool can be used in a Java application even when not using a database at all. Example:
@tutorial_1115_h3
@tutorial_1119_h3
Reading a CSV File from a Java Application
@tutorial_1116_p
@tutorial_1120_p
It is possible to read a CSV file without opening a database. Example:
@tutorial_1117_h2
@tutorial_1121_h2
Upgrade, Backup, and Restore
@tutorial_1118_h3
@tutorial_1122_h3
Database Upgrade
@tutorial_1119_p
@tutorial_1123_p
The recommended way to upgrade from one version of the database engine to the next version is to create a backup of the database (in the form of a SQL script) using the old engine, and then execute the SQL script using the new engine.
@tutorial_1120_h3
@tutorial_1124_h3
Backup using the Script Tool
@tutorial_1121_p
@tutorial_1125_p
There are different ways to backup a database. For example, it is possible to copy the database files. However, this is not recommended while the database is in use. Also, the database files are not human readable and quite large. The recommended way to backup a database is to create a compressed SQL script file. This can be done using the Script tool:
@tutorial_1122_p
@tutorial_1126_p
It is also possible to use the SQL command SCRIPT to create the backup of the database. For more information about the options, see the SQL command SCRIPT. The backup can be done remotely, however the file will be created on the server side. The built in FTP server could be used to retrieve the file from the server.
@tutorial_1123_h3
@tutorial_1127_h3
Restore from a Script
@tutorial_1124_p
@tutorial_1128_p
To restore a database from a SQL script file, you can use the RunScript tool:
@tutorial_1125_p
@tutorial_1129_p
For more information about the options, see the SQL command RUNSCRIPT. The restore can be done remotely, however the file needs to be on the server side. The built in FTP server could be used to copy the file to the server. It is also possible to use the SQL command RUNSCRIPT to execute a SQL script. SQL script files may contain references to other script files, in the form of RUNSCRIPT commands. However, when using the server mode, the references script files need to be available on the server side.
@tutorial_1126_h3
@tutorial_1130_h3
Online Backup
@tutorial_1127_p
@tutorial_1131_p
The BACKUP SQL statement and the Backup tool both create a zip file with all database files. However, the contents of this file are not human readable. Other than the SCRIPT statement, the BACKUP statement does not lock the database objects, and therefore does not block other users. The resulting backup is transactionally consistent:
@tutorial_1128_p
@tutorial_1132_p
The Backup tool (org.h2.tools.Backup) can not be used to create a online backup; the database must not be in use while running this program.
@tutorial_1129_h2
@tutorial_1133_h2
Command Line Tools
@tutorial_1130_p
@tutorial_1134_p
This database comes with a number of command line tools. To get more information about a tool, start it with the parameter '-?', for example:
@tutorial_1131_p
@tutorial_1135_p
The command line tools are:
@tutorial_1132_b
@tutorial_1136_b
Backup
@tutorial_1133_li
@tutorial_1137_li
creates a backup of a database.
@tutorial_1134_b
@tutorial_1138_b
ChangeFileEncryption
@tutorial_1135_li
@tutorial_1139_li
allows changing the file encryption password or algorithm of a database.
@tutorial_1136_b
@tutorial_1140_b
Console
@tutorial_1137_li
@tutorial_1141_li
starts the browser based H2 Console.
@tutorial_1138_b
@tutorial_1142_b
ConvertTraceFile
@tutorial_1139_li
@tutorial_1143_li
converts a .trace.db file to a Java application and SQL script.
@tutorial_1140_b
@tutorial_1144_b
CreateCluster
@tutorial_1141_li
@tutorial_1145_li
creates a cluster from a standalone database.
@tutorial_1142_b
@tutorial_1146_b
DeleteDbFiles
@tutorial_1143_li
@tutorial_1147_li
deletes all files belonging to a database.
@tutorial_1144_b
@tutorial_1148_b
Script
@tutorial_1145_li
@tutorial_1149_li
allows converting a database to a SQL script for backup or migration.
@tutorial_1146_b
@tutorial_1150_b
Recover
@tutorial_1147_li
@tutorial_1151_li
helps recovering a corrupted database.
@tutorial_1148_b
@tutorial_1152_b
Restore
@tutorial_1149_li
@tutorial_1153_li
restores a backup of a database.
@tutorial_1150_b
@tutorial_1154_b
RunScript
@tutorial_1151_li
@tutorial_1155_li
runs a SQL script against a database.
@tutorial_1152_b
@tutorial_1156_b
Server
@tutorial_1153_li
@tutorial_1157_li
is used in the server mode to start a H2 server.
@tutorial_1154_b
@tutorial_1158_b
Shell
@tutorial_1155_li
@tutorial_1159_li
is a command line database tool.
@tutorial_1156_p
@tutorial_1160_p
The tools can also be called from an application by calling the main or another public methods. For details, see the Javadoc documentation.
@tutorial_1157_h2
@tutorial_1161_h2
Using OpenOffice Base
@tutorial_1158_p
@tutorial_1162_p
OpenOffice.org Base supports database access over the JDBC API. To connect to a H2 database using OpenOffice Base, you first need to add the JDBC driver to OpenOffice. The steps to connect to a H2 database are:
@tutorial_1159_li
@tutorial_1163_li
Start OpenOffice Writer, go to [Tools], [Options]
@tutorial_1160_li
@tutorial_1164_li
Make sure you have selected a Java runtime environment in OpenOffice.org / Java
@tutorial_1161_li
@tutorial_1165_li
Click [Class Path...], [Add Archive...]
@tutorial_1162_li
@tutorial_1166_li
Select your h2.jar (location is up to you, could be wherever you choose)
@tutorial_1163_li
@tutorial_1167_li
Click [OK] (as much as needed), stop OpenOffice (including the Quickstarter)
@tutorial_1164_li
@tutorial_1168_li
Start OpenOffice Base
@tutorial_1165_li
@tutorial_1169_li
Connect to an existing database; select JDBC; [Next]
@tutorial_1166_li
@tutorial_1170_li
Example datasource URL: jdbc:h2:~/test
@tutorial_1167_li
@tutorial_1171_li
JDBC driver class: org.h2.Driver
@tutorial_1168_p
@tutorial_1172_p
Now you can access the database stored in the current users home directory.
@tutorial_1169_p
@tutorial_1173_p
To use H2 in NeoOffice (OpenOffice without X11):
@tutorial_1170_li
@tutorial_1174_li
In NeoOffice, go to [NeoOffice], [Preferences]
@tutorial_1171_li
@tutorial_1175_li
Look for the page under [NeoOffice], [Java]
@tutorial_1172_li
@tutorial_1176_li
Click [Classpath], [Add Archive...]
@tutorial_1173_li
@tutorial_1177_li
Select your h2.jar (location is up to you, could be wherever you choose)
@tutorial_1174_li
@tutorial_1178_li
Click [OK] (as much as needed), restart NeoOffice.
@tutorial_1175_p
@tutorial_1179_p
Now, when creating a new database using the "Database Wizard":
@tutorial_1176_li
@tutorial_1180_li
Select "connect to existing database" and the type "jdbc". Click next.
@tutorial_1177_li
@tutorial_1181_li
Enter your h2 database URL. The normal behavior of H2 is that a new db is created if it doesn't exist.
@tutorial_1178_li
@tutorial_1182_li
Next step - up to you... you can just click finish and start working.
@tutorial_1179_p
@tutorial_1183_p
Another solution to use H2 in NeoOffice is:
@tutorial_1180_li
@tutorial_1184_li
Package the h2 jar within an extension package
@tutorial_1181_li
@tutorial_1185_li
Install it as a Java extension in NeoOffice
@tutorial_1182_p
@tutorial_1186_p
This can be done by create it using the NetBeans OpenOffice plugin. See also <a href="http://wiki.services.openoffice.org/wiki/Extensions_development_java">Extensions Development</a> .
@tutorial_1183_h2
@tutorial_1187_h2
Java Web Start / JNLP
@tutorial_1184_p
@tutorial_1188_p
When using Java Web Start / JNLP (Java Network Launch Protocol), permissions tags must be set in the .jnlp file, and the application .jar file must be signed. Otherwise, when trying to write to the file system, the following exception will occur: java.security.AccessControlException: access denied (java.io.FilePermission ... read). Example permission tags:
@tutorial_1185_h2
@tutorial_1189_h2
Using a Connection Pool
@tutorial_1186_p
@tutorial_1190_p
For many databases, opening a connection is slow, and it is a good idea to use a connection pool to re-use connections. For H2 however opening a connection usually is fast if the database is already open. Using a connection pool for H2 actually slows down the process a bit, except if file encryption is used (in this case opening a connection is about half as fast as using a connection pool). A simple connection pool is included in H2. It is based on the <a href="http://www.source-code.biz/snippets/java/8.htm">Mini Connection Pool Manager</a> from Christian d'Heureuse. There are other, more complex connection pools available, for example <a href="http://jakarta.apache.org/commons/dbcp/">DBCP</a> . The build-in connection pool is used as follows:
@tutorial_1187_h2
@tutorial_1191_h2
Fulltext Search
@tutorial_1188_p
@tutorial_1192_p
H2 supports Lucene full text search and native full text search implementation.
@tutorial_1189_h3
@tutorial_1193_h3
Using the Native Full Text Search
@tutorial_1190_p
@tutorial_1194_p
To initialize, call:
@tutorial_1191_p
@tutorial_1195_p
You need to initialize it in each database where you want to use it. Afterwards, you can create a full text index for a table using:
@tutorial_1192_p
@tutorial_1196_p
PUBLIC is the schema, TEST is the table name. The list of column names (column separated) is optional, in this case all columns are indexed. The index is updated in read time. To search the index, use the following query:
@tutorial_1193_p
@tutorial_1197_p
You can also call the index from within a Java application:
@tutorial_1194_h3
@tutorial_1198_h3
Using the Lucene Fulltext Search
@tutorial_1195_p
@tutorial_1199_p
To use the Lucene full text search, you need the Lucene library in the classpath. How his is done depends on the application; if you use the H2 Console, you can add the Lucene jar file to the environment variables H2DRIVERS or CLASSPATH. To initialize the Lucene full text search in a database, call:
@tutorial_1196_p
@tutorial_1200_p
You need to initialize it in each database where you want to use it. Afterwards, you can create a full text index for a table using:
@tutorial_1197_p
@tutorial_1201_p
PUBLIC is the schema, TEST is the table name. The list of column names (column separated) is optional, in this case all columns are indexed. The index is updated in read time. To search the index, use the following query:
@tutorial_1198_p
@tutorial_1202_p
You can also call the index from within a Java application:
@tutorial_1199_h2
@tutorial_1203_h2
User-Defined Variables
@tutorial_1200_p
@tutorial_1204_p
This database supports user-defined variables. Variables start with @ and can be used wherever expressions or parameters are used. Variables not persisted and session scoped, that means only visible for the session where they are defined. A value is usually assigned using the SET command:
@tutorial_1201_p
@tutorial_1205_p
It is also possible to change a value using the SET() method. This is useful in queries:
@tutorial_1202_p
@tutorial_1206_p
Variables that are not set evaluate to NULL. The data type of a user-defined variable is the data type of the value assigned to it, that means it is not necessary (or possible) to declare variable names before using them. There are no restrictions on the assigned values; large objects (LOBs) are supported as well.
@tutorial_1203_h2
@tutorial_1207_h2
Date and Time
@tutorial_1204_p
@tutorial_1208_p
Date, time and timestamp values support ISO 8601 formatting, including time zone:
@tutorial_1205_p
@tutorial_1209_p
If the time zone is not set, the value is parsed using the current time zone setting of the system. Date and time information is stored in H2 database files in GMT (Greenwich Mean Time). If the database is opened using another system time zone, the date and time will change accordingly. If you want to move a database from one time zone to the other and don't want this to happen, you need to create a SQL script file using the SCRIPT command or Script tool, and then load the database using the RUNSCRIPT command or the RunScript tool in the new time zone.
#ALTER TABLE used a lot of memory when using multi-version concurrency.
#Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1003_li
#Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
#Date values that match the daylight saving time end were not allowed in times zones were the daylight saving time ends at midnight, for years larger than 2037. Example: timezone Brasilia, date 2042-10-12. This is a problem of Java, however a workaround is implemented in H2 that solves most problems (except the problems of java.sql.Date itself).
@changelog_1004_li
#New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
#ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1005_li
#Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
#Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1006_li
#The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
#New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1007_li
#Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
#Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
@changelog_1008_li
#Less heap memory is needed when multiple databases are open at the same time: The memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
#The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1009_li
#New system property h2.browser to set the browser to use.
#Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1010_li
#Less heap memory is needed when multiple databases are open at the same time: The memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
@changelog_1011_li
#New system property h2.browser to set the browser to use.
@changelog_1012_li
#To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1011_h2
@changelog_1013_h2
#Version 1.1.102 (2008-10-24)
@changelog_1012_li
@changelog_1014_li
#The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1013_li
@changelog_1015_li
#There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1014_li
@changelog_1016_li
#SET LOG 2 was not effective if executed after opening the database.
@changelog_1015_li
@changelog_1017_li
#Translating the H2 Console is now simpler.
@changelog_1016_li
@changelog_1018_li
#Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1017_li
@changelog_1019_li
#In-memory databases don't write LOBs to files any longer.
@changelog_1018_li
@changelog_1020_li
#Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1019_li
@changelog_1021_li
#ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1020_li
@changelog_1022_li
#Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1021_h2
@changelog_1023_h2
#Version 1.1.101 (2008-10-17)
@changelog_1022_li
@changelog_1024_li
#Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1023_li
@changelog_1025_li
#Queries with more than 10 tables are now faster.
@changelog_1024_li
@changelog_1026_li
#Opening a connection with AUTO_SERVER=TRUE is now fast when the database is already open in another process (less than 0.01 seconds instead of 2 seconds).
@changelog_1025_li
@changelog_1027_li
#IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1026_li
@changelog_1028_li
#The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1027_li
@changelog_1029_li
#Linked tables: the automatic connection sharing didn't work. Actually the system property h2.shareLinkedConnections was working in the opposite direction: it was disabled when set to true. Now it works as expected.
@changelog_1028_li
@changelog_1030_li
#Opening large database is now faster.
@changelog_1029_li
@changelog_1031_li
#New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1030_li
@changelog_1032_li
#The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1031_li
@changelog_1033_li
#Unset parameters were not detected when the query was re-compiled.
@changelog_1032_li
@changelog_1034_li
#New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1033_li
@changelog_1035_li
#The date functions DAYOFYEAR, DAYOFMONTH, DAYOFWEEK are now called DAY_OF_YEAR, DAY_OF_MONTH, DAY_OF_WEEK (the old names still work).
@changelog_1034_li
@changelog_1036_li
#An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1035_li
@changelog_1037_li
#Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1036_li
@changelog_1038_li
#Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1037_li
@changelog_1039_li
#The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1038_li
@changelog_1040_li
#Fulltext search: new method FT_DROP_INDEX.
@changelog_1039_li
@changelog_1041_li
#The optimization to group using an index didn't work in some cases in version 1.1 (see also system property h2.optimizeGroupSorted).
@changelog_1040_li
@changelog_1042_li
#OSGi meta data is included in the manifest file. An OSGi BundleActivator is included: it loads the database driver when starting the bundle, and unloads it when stopping the bundle.
@changelog_1041_li
@changelog_1043_li
#The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1042_li
@changelog_1044_li
#For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1043_li
@changelog_1045_li
#In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1044_li
@changelog_1046_li
#After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1045_li
@changelog_1047_li
#Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1046_li
@changelog_1048_li
#RUNSCRIPT no longer uses a temporary file.
@changelog_1047_li
@changelog_1049_li
#New system table INFORMATION_SCHEMA.SESSION_STATE containing the SQL statements that make up the session state. The list currently contains variables (SET @..) and local temporary tables (without data).
@changelog_1048_li
@changelog_1050_li
#After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1049_li
@changelog_1051_li
#The build didn't work if the directory temp didn't exist before.
@changelog_1050_li
@changelog_1052_li
#New system property h2.maxReconnect (default 3) to limit the number of re-connects for the same SQL statement (this is usually only important for SHUTDOWN).
@changelog_1051_li
@changelog_1053_li
#WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1052_li
@changelog_1054_li
#Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1053_h2
@changelog_1055_h2
#Version 1.1.100 (2008-10-04)
@changelog_1054_li
@changelog_1056_li
#In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1055_li
@changelog_1057_li
#The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1056_li
@changelog_1058_li
#The H2 Console tool now supports command line options to start things separately.
@changelog_1057_li
@changelog_1059_li
#Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1058_li
@changelog_1060_li
#Connections from a local address other than 'localhost' were not allowed if remote connections were disabled. This was always a problem, but only got visible in the last release because the server no longer connects to 'localhost' if networked.
@changelog_1059_li
@changelog_1061_li
#The h2console.war can now be built using the Java build.
@changelog_1060_li
@changelog_1062_li
#By default, databases are shared in the same process. For read-only databases this causes unnecessary synchronization, but safes memory. If you want that each connection opens its own database, append ;OPEN_NEW=TRUE to the database URL.
@changelog_1061_li
@changelog_1063_li
#New auto-reconnect feature will cause the JDBC driver to reconnect to the database if the connection is lost. To enable, append ;AUTO_RECONNECT=TRUE to the database URL. This is specially helpful when using AUTO_SERVER. AUTO_SERVER automatically uses auto-reconnect.
@changelog_1062_li
@changelog_1064_li
#CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1063_li
@changelog_1065_li
#The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1064_li
@changelog_1066_li
#Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1065_h2
@changelog_1067_h2
#Version 1.0.79 (2008-09-26)
@changelog_1066_li
@changelog_1068_li
#Linked tables that point to the same database can now share the connection within the same database. Access to the same connection is serialized. To enable this feature, set the system property h2.shareLinkedConnections to true.
@changelog_1067_li
@changelog_1069_li
#Multiple processes can now access the same database without having to explicitly start the server. To do that, append ;AUTO_SERVER=TRUE to the database URL. In this case, the server is started automatically if the connection is in embedded mode, and the server mode is used if a server is running. If the process that opened the first connection is closed, the other client need to reconnect (there is no automatic re-connect so far). Remote connections are allowed, but only to this database.
@changelog_1068_li
@changelog_1070_li
#The server tool now displays the correct IP address if networked.
@changelog_1069_li
@changelog_1071_li
#Can now start a TCP server with port 0 (automatically select a port).
@changelog_1070_li
@changelog_1072_li
#Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1071_li
@changelog_1073_li
#LINKED TABLE: the schema name can now be set. When multiple tables exist in different schema, and the schema name is not set, an exception is thrown.
@changelog_1072_li
@changelog_1074_li
#LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1073_li
@changelog_1075_li
#Faster hash code calculation for large binary arrays.
@changelog_1074_li
@changelog_1076_li
#Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1075_li
@changelog_1077_li
#The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1076_li
@changelog_1078_li
#The H2 Console now abbreviates large texts in results.
@changelog_1077_li
@changelog_1079_li
#Multiple UNION queries could not be used in derived tables.
@changelog_1078_li
@changelog_1080_li
#Linked tables can now be read-only.
@changelog_1079_li
@changelog_1081_li
#Temporary linked tables are now supported.
@changelog_1080_li
@changelog_1082_li
#It was possible to create tables in read-only databases.
@changelog_1081_li
@changelog_1083_li
#SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1082_li
@changelog_1084_li
#SET SCHEMA did not work for views.
@changelog_1083_li
@changelog_1085_li
#Row level locking for MVCC is now enabled. The exception 'Concurrent update in table ...' is still thrown, but only after the lock timeout.
@changelog_1084_li
@changelog_1086_li
#The maximum log file size setting was ignored for large databases.
@changelog_1085_li
@changelog_1087_li
#Multi-Version Concurrency (MVCC) may no longer be used when using the multi-threaded kernel feature (MULTI_THREADED). An exception is thrown when trying to connect with both settings. Additional synchronization is required before those features can be used together.
@changelog_1086_li
@changelog_1088_li
#The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1087_li
@changelog_1089_li
#The system property h2.optimizeInJoin did not work correctly.
@changelog_1088_li
@changelog_1090_li
#Conditions such as ID=? AND ID>? were slow.
@changelog_1089_h2
@changelog_1091_h2
#Version 1.0.78 (2008-08-28)
@changelog_1090_li
@changelog_1092_li
#The documentation no longer uses a frameset (except the Javadocs).
@changelog_1091_li
@changelog_1093_li
#When using DB_CLOSE_DELAY, sometimes a NullPointerException is thrown when the database is opened almost at the same time as it is closed automatically. Thanks a lot to Dmitry Pekar for finding this!
@changelog_1092_li
@changelog_1094_li
#Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1093_li
@changelog_1095_li
#The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1094_li
@changelog_1096_li
#The H2 Console replaced an empty user name with a single space.
@changelog_1095_li
@changelog_1097_li
#The build target 'build jarSmall' now includes the embedded database.
@changelog_1096_li
@changelog_1098_li
#JdbcDataSource now keeps the password in a char array where possible.
@changelog_1097_li
@changelog_1099_li
#ResultSet.absolute did not always work with large result sets.
@changelog_1098_li
@changelog_1100_li
#Column aliases can now be used in GROUP BY and HAVING.
@changelog_1099_li
@changelog_1101_li
#Jason Brittain has contributed MySQL date functions. Thanks a lot! They are not in the h2.jar file currently, but in src/tools/org/h2/mode/FunctionsMySQL.java. To install, add this class to the classpath and call FunctionsMySQL.register(conn) in the Java code.
@changelog_1100_h2
@changelog_1102_h2
#Version 1.0.77 (2008-08-16)
@changelog_1101_li
@changelog_1103_li
#JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1102_li
@changelog_1104_li
#When using remote in-memory databases, large LOB objects did not work.
@changelog_1103_li
@changelog_1105_li
#Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1104_li
@changelog_1106_li
#Opening a large database was slow if there was a problem opening the previous time.
@changelog_1105_li
@changelog_1107_li
#NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1106_li
@changelog_1108_li
#CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1107_li
@changelog_1109_li
#Support a comma before closing a list, as in: create table test(id int,)
@changelog_1108_li
@changelog_1110_li
#MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1109_li
@changelog_1111_li
#DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1110_li
@changelog_1112_li
#Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1111_li
@changelog_1113_li
#ResultSet.setFetchSize is now supported.
@changelog_1112_li
@changelog_1114_li
#It has been reported that when using Install4j on some Linux systems and enabling the 'pack200' option, the h2.jar becomes corrupted by the install process, causing application failure. A workaround is to add an empty file h2.jar.nopack next to the h2.jar file. The reason for this problem is not known.
@changelog_1113_h2
@changelog_1115_h2
#Version 1.0.76 (2008-07-27)
@changelog_1114_li
@changelog_1116_li
#The comment of a domain (user defined data type) is now used as the default column comment when creating a column with this domain.
@changelog_1115_li
@changelog_1117_li
#Invalid database names are now detected and a better error message is thrown.
@changelog_1116_li
@changelog_1118_li
#ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1117_li
@changelog_1119_li
#Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1118_li
@changelog_1120_li
#There is a problem with Hibernate when using Boolean columns. A patch for Hibernate has been submitted at http://opensource.atlassian.com/projects/hibernate/browse/HHH-3401
@changelog_1119_li
@changelog_1121_li
#ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1120_li
@changelog_1122_li
#H2 Console: The progress display when opening a database has been improved.
@changelog_1121_li
@changelog_1123_li
#The error message when the server doesn't start has been improved.
@changelog_1122_li
@changelog_1124_li
#Key values can now be changed in updatable result sets.
@changelog_1123_li
@changelog_1125_li
#Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1124_li
@changelog_1126_li
#Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1125_li
@changelog_1127_li
#The database file was growing after deleting many rows, and after large update operations.
@changelog_1126_h2
@changelog_1128_h2
#Version 1.0.75 (2008-07-14)
@changelog_1127_li
@changelog_1129_li
#Multi version concurrency (MVCC): when a row was updated or deleted, but this change was rolled back, the row was not visible by other sessions if no index was used to access it. Fixed.
@changelog_1128_li
@changelog_1130_li
#Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1129_li
@changelog_1131_li
#The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1130_li
@changelog_1132_li
#Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1131_li
@changelog_1133_li
#Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1132_li
@changelog_1134_li
#When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1133_li
@changelog_1135_li
#Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1134_li
@changelog_1136_li
#Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1135_li
@changelog_1137_li
#The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1136_li
@changelog_1138_li
#The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1137_li
@changelog_1139_li
#The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1138_li
@changelog_1140_li
#Stopping a WebServer didn't always work. Fixed.
@changelog_1139_h2
@changelog_1141_h2
#Version 1.0.74 (2008-06-21)
@changelog_1140_li
@changelog_1142_li
#Work on row level locking has been started (but there is nothing usable yet).
@changelog_1141_li
@changelog_1143_li
#JaQu (Java Query), a tool similar to LINQ (Language Integrated Query; from Microsoft) is now included under src/tools/org/h2/jaqu. A small sample application is included under src/test/org/h2/test/jaqu.
@changelog_1142_li
@changelog_1144_li
#The source code is now switched to Java 1.6 by default. To switch back to Java 1.4, run 'build compile'. The h2.jar file is still Java 1.4.
@changelog_1143_li
@changelog_1145_li
#The ChangePassword tool is now called ChangeFileEncryption.
@changelog_1144_li
@changelog_1146_li
#It is no longer allowed to create columns with the data type NULL. Also, it is no longer allowed to convert a column to the data type NULL. This was possible before but caused data loss.
@changelog_1145_li
@changelog_1147_li
#When using computed columns or default values with a different data type than the column data type, a class cast exception could occur. Fixed.
@changelog_1146_li
@changelog_1148_li
#Opening databases larger than 1 GB was sometimes very slow if a lot of data was deleted previously. Fixed.
@changelog_1147_li
@changelog_1149_li
#RUNSCRIPT could throw a NullPointerException if the script name was an expression.
@changelog_1148_li
@changelog_1150_li
#Improved compatibility. New compatibility modes for Oracle and Derby. New compatibility flag uniqueIndexNullDistinct to only allow one row with 'NULL' in a unique index. This flag is enabled for Derby, Oracle, MSSQLServer, and HSQLDB.
@changelog_1149_li
@changelog_1151_li
#Linked tables: To view the statements that are executed against the target table, set the trace level to 3.
@changelog_1150_li
@changelog_1152_li
#RunScript tool: new options to show and check the results of queries.
@changelog_1151_li
@changelog_1153_li
#Deadlocks are now detected. One transaction is rolled back automatically.
@changelog_1152_li
@changelog_1154_li
#The Lucene fulltext index was always re-created when opening a database with fulltext index enabled.
@changelog_1153_li
@changelog_1155_li
#Support for overloaded Java methods. A user defined function can now be bound to multiple Java methods, if the Java methods have the same name but a different number of parameters. Thanks to Gary Tong for providing a patch!
@changelog_1154_h2
@changelog_1156_h2
#Version 1.0.73 (2008-05-31)
@changelog_1155_li
@changelog_1157_li
#ParameterMetaData now returns the right data type for most conditions, as in WHERE ID=?.
@changelog_1156_li
@changelog_1158_li
#The table SYSTEM_RANGE now supports expressions and parameters.
@changelog_1157_li
@changelog_1159_li
#New column INFORMATION_SCHEMA.CONSTRAINTS.UNIQUE_INDEX_NAME that contains the name of the unique index used to enforce this constraint, if there is such an index.
@changelog_1158_li
@changelog_1160_li
#SET QUERY_TIMEOUT and Statement.setQueryTimeout no longer commits a transaction. The same applies to SET @VARIABLE, SET LOCK_TIMEOUT, SET TRACE_LEVEL_*, SET THROTTLE, and SET PATH.
@changelog_1159_li
@changelog_1161_li
#The SCRIPT command does now emit IF NOT EXISTS for CREATE ROLE.
@changelog_1160_li
@changelog_1162_li
#MySQL compatibility: auto_increment column are no longer automatically converted to primary key columns.
@changelog_1161_li
@changelog_1163_li
#PostgreSQL compatibility: support for BOOL_OR and BOOL_AND aggregate functions.
@changelog_1162_li
@changelog_1164_li
#Negative scale values for DECIMAL or NUMBER columns are now supported in regular tables and in linked tables.
@changelog_1163_li
@changelog_1165_li
#A role or right can now be granted or revoked multiple times without getting an exception.
@changelog_1164_li
@changelog_1166_li
#Infinite numbers in SQL scripts are listed as POWER(0, -1)), negative infinite as (-POWER(0, -1)), and NaN (not a number) as SQRT(-1).
@changelog_1165_li
@changelog_1167_li
#The special double and float values 'NaN' (not a number) did not work correctly when sorting or comparing.
@changelog_1166_li
@changelog_1168_li
#The fulltext search did not support CLOB data types.
@changelog_1167_li
@changelog_1169_li
#If the drive with the database files was disconnected or unmounted while writing, sometimes a stack overflow exception was thrown instead of a IO exception.
@changelog_1168_li
@changelog_1170_li
#The H2 Console could not be shut down from within the tool if the browser supports keepAlive (most browsers do).
@changelog_1169_li
@changelog_1171_li
#If the password was passed as a char array, it was kept in an internal buffer longer than required. Theoretically the password could have been stolen if the main memory was swapped to disk before the garbage collection was run.
@changelog_1170_h2
@changelog_1172_h2
#Version 1.0.72 (2008-05-10)
@changelog_1171_li
@changelog_1173_li
#Some databases could not be opened when appending ;RECOVER=1 to the database URL.
@changelog_1172_li
@changelog_1174_li
#The Japanese translation of the error messages and the H2 Console has been completed by Masahiro Ikemoto (Arizona Design Inc.)
@changelog_1173_li
@changelog_1175_li
#Updates made to updatable rows are now visible within the same result set. DatabaseMetaData.ownUpdatesAreVisible now returns true.
@changelog_1174_li
@changelog_1176_li
#ParameterMetaData now returns the correct data for INSERT and UPDATE statements.
@changelog_1175_li
@changelog_1177_li
#H2 Shell: DESCRIBE now supports an schema name.
@changelog_1176_li
@changelog_1178_li
#A subset of the PostgreSQL 'dollar quoting' feature is now supported.
@changelog_1177_li
@changelog_1179_li
#SLF4J is now supported by using adding TRACE_LEVEL_FILE=4 to the database URL.
@changelog_1178_li
@changelog_1180_li
#The recovery tool did not work if the table name contained spaces or if there was a comment on the table.
@changelog_1179_li
@changelog_1181_li
#Triggers are no longer executed when changing the table structure (ALTER TABLE).
@changelog_1180_li
@changelog_1182_li
#When setting BLOB or CLOB values larger than 65 KB using a remote connection, temporary files were kept on the client longer than required (until the connection was closed or the object is garbage collected). Now they are removed as soon as the PreparedStatement is closed, or when the value is overwritten.
@changelog_1181_li
@changelog_1183_li
#Statements can now be canceled remotely (when using remote connections).
@changelog_1182_li
@changelog_1184_li
#The Shell tool now uses java.io.Console to read the password when using JDK 1.6
@changelog_1183_li
@changelog_1185_li
#When using read-only databases and setting LOG=2, an exception was written to the trace file when closing the database. Fixed.
@changelog_1184_h2
@changelog_1186_h2
#Version 1.0.71 (2008-04-25)
@changelog_1185_li
@changelog_1187_li
#H2 is now dual-licensed under the Eclipse Public License (EPL) and the old 'H2 License' (which is basically MPL).
@changelog_1186_li
@changelog_1188_li
#Sometimes an exception 'File ID mismatch' or 'try to add a record twice' occurred after large records (8 KB or larger) are updated or deleted. See also http://code.google.com/p/h2database/issues/detail?id=22
@changelog_1187_li
@changelog_1189_li
#H2 Console: The tools can now be translated (it didn't work in the last release).
@changelog_1188_li
@changelog_1190_li
#New traditional Chinese translation. Thanks a lot to Derek Chao!
@changelog_1189_li
@changelog_1191_li
#Indexes were not used when enabling the optimization for IN(SELECT...) (system property h2.optimizeInJoin).
@changelog_1190_h2
@changelog_1192_h2
#Version 1.0.70 (2008-04-20)
@changelog_1191_li
@changelog_1193_li
#The plan is to dual-license H2. The additional license is EPL (Eclipse Public License). The current license (MPL, Mozilla Public License) will stay. Current users are not affected because they can keep MPL. EPL is very similar to MPL, the only bigger difference is related to patents (EPL is a bit more business friendly in this regard). See also http://opensource.org/licenses/eclipse-1.0.php, http://www.eclipse.org/legal/eplfaq.php (FAQ), http://blogs.zdnet.com/Burnette/?p=131
@changelog_1192_li
@changelog_1194_li
#Multi version concurrency (MVCC): when a row was updated, and the updated column was not indexed, this update was visible sometimes for other sessions even if it was not committed.
@changelog_1193_li
@changelog_1195_li
#Calling SHUTDOWN on one connection and starting a query on another connection concurrently could result in a Java level deadlock.
@changelog_1194_li
@changelog_1196_li
#New system property h2.enableAnonymousSSL (default: true) to enable anonymous SSL connections.
@changelog_1195_li
@changelog_1197_li
#The precision if SUBSTR is now calculated if possible.
@changelog_1196_li
@changelog_1198_li
#The autocomplete in the H2 Console has been improved a bit.
@changelog_1197_li
@changelog_1199_li
#The tools in the H2 Console are now translatable.
@changelog_1198_li
@changelog_1200_li
#The servlet and lucene jar files are now automatically downloaded when building.
@changelog_1199_li
@changelog_1201_li
#The code switch tool has been replaced by a simpler tool called SwitchSource that just uses find and replace.
@changelog_1200_li
@changelog_1202_li
#Started to write a Ant replacement ('JAnt') that uses pure Java build definitions. Advantages: ability to debug the build, extensible, flexible, no XML, a bit faster. Future plan: support creating custom h2 distributions (for embedded use). Maybe create a new project 'Jant' or 'Javen' if other people are interested.
@changelog_1201_li
@changelog_1203_li
#The jar file is now about 10% smaller because the variable debugging info is no longer included. The source file and line number debugging info is still included. If required, the jar file size of the full version can be further reduced to about 720 KB using 'build jarSmall' or even more by removing unneeded components.
@changelog_1202_li
@changelog_1204_li
#Added shell scripts run.sh and build.sh. chmod +x is required, but otherwise it should work. Feedback or improvements are welcome!
@changelog_1203_li
@changelog_1205_li
#Databases in zip files: large queries are now supported. Temp files are created in the temp directory if required. The documentation how to create the zip file has been corrected.
#The Japanese translation of the error messages and the H2 Console has been improved. Thanks a lot to Masahiro IKEMOTO.
@changelog_1206_li
@changelog_1208_li
#Optimization for MIN() and MAX() when using MVCC.
@changelog_1207_li
@changelog_1209_li
#To protect against remote brute force password attacks, the delay after each unsuccessful login now gets double as long. New system properties h2.delayWrongPasswordMin and h2.delayWrongPasswordMax.
@changelog_1208_li
@changelog_1210_li
#After setting the query timeout and then resetting it, the next query would still timeout. Fixed.
@changelog_1209_li
@changelog_1211_li
#Adding a IDENTITY column to a table with data threw a lock timeout.
@changelog_1210_li
@changelog_1212_li
#OutOfMemoryError could occur when using EXISTS or IN(SELECT ..).
@changelog_1211_li
@changelog_1213_li
#The built-in connection pool is not called JdbcConnectionPool. The API and documentation has been changed.
@changelog_1212_li
@changelog_1214_li
#The ConvertTraceFile tool now generates SQL statement statistics at the end of the SQL script file (similar to the profiling data generated when using java -Xrunhprof).
@changelog_1213_li
@changelog_1215_li
#Nested joins are now supported (A JOIN B JOIN C ON .. ON ..)
@changelog_1214_h2
@changelog_1216_h2
#Version 1.0.69 (2008-03-29)
@changelog_1215_li
@changelog_1217_li
#Most command line tools can now be called from within the H2 Console.
@changelog_1216_li
@changelog_1218_li
#A new Shell tools is now included (org.h2.tools.Shell) to query a database from the command line.
@changelog_1217_li
@changelog_1219_li
#The command line options in the tools have changed: instead of '-log true' now '-trace' is used. Also, '-ifExists', '-tcpSSL' and '-tcpAllowOthers' and so on have changed: now the 'true' is no longer needed. The old behavior is still supported.
@changelog_1218_li
@changelog_1220_li
#New system property h2.sortNullsHigh to invert the default sorting behavior for NULL. The default didn't change.
@changelog_1219_li
@changelog_1221_li
#Performance was very slow when using LOG=2 and deleting or updating all rows of a table in a loop. Fixed.
@changelog_1220_li
@changelog_1222_li
#ALTER TABLE or CREATE TABLE now support parameters for the password field.
@changelog_1221_li
@changelog_1223_li
#The linear hash has been removed. It was always slower than the b-tree index, and there were some bugs that would be hard to fix.
@changelog_1222_li
@changelog_1224_li
#TRACE_LEVEL_ settings are no longer persistent. This was a problem when database initialization code caused a lot of trace output.
@changelog_1223_li
@changelog_1225_li
#Fulltext search (native implementation): The words table is no longer an in-memory table because this caused memory problems in some cases.
@changelog_1224_li
@changelog_1226_li
#It was possible to create a role with the name as an existing user (but not vice versa). This is not allowed any more.
@changelog_1225_li
@changelog_1227_li
#The recovery tool didn't work correctly for tables without rows.
@changelog_1226_li
@changelog_1228_li
#For years below 1, the YEAR method didn't return the correct value, and the conversion from date and timestamp to varchar was incorrect.
@changelog_1227_li
@changelog_1229_li
#CSVWRITE caused a NullPointerException when not specifying a nullString.
@changelog_1228_li
@changelog_1230_li
#When a log file switch occurred just after a truncate table or drop table statement, the database could not be started normally (RECOVER=1 was required). Fixed.
@changelog_1229_li
@changelog_1231_li
#When a log file switch occurred in the middle of a sequence flush (sequences are only flushed every 32 values by default), the sequence value was lost. Fixed.
@changelog_1230_li
@changelog_1232_li
#Altering a sequence didn't unlock the system table when autocommit switched off.
@changelog_1231_h2
@changelog_1233_h2
#Version 1.0.68 (2008-03-18)
@changelog_1232_li
@changelog_1234_li
#Very large SELECT DISTINCT and UNION EXCEPT queries are now supported, however this feature is disabled by default. To enable it, set the system property h2.maxMemoryRowsDistinct to a lower value, for example 10000.
@changelog_1233_li
@changelog_1235_li
#A error is now thrown when trying to call a method inside a trigger that implicitly commits the current transaction, if an object is locked.
@changelog_1234_li
@changelog_1236_li
#Unused LOB files were deleted much too late. Now they are deleted if no longer referenced in memory.
@changelog_1235_li
@changelog_1237_li
#ALTER SEQUENCE and ALTER TABLE ALTER COLUMN RESTART can now be used inside a transaction.
@changelog_1236_li
@changelog_1238_li
#New system property h2.aliasColumnName. When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the real table and column name in ResultSetMetaData.getTableName() and getColumnName(). This is disabled by default for compatibility with other databases (HSQLDB, Apache Derby, PostgreSQL, some version of MySQL). In version 1.1 this setting will be enabled.
@changelog_1237_li
@changelog_1239_li
#When using encrypted databases, and using the wrong file password, the log file was renamed if the database was not already open. Fixed.
@changelog_1238_li
@changelog_1240_li
#Improved performance when using lob files in directories (however this is still disabled by default)
@changelog_1239_li
@changelog_1241_li
#H2 Console: autocomplete didn't work with very large scripts. Fixed.
@changelog_1240_li
@changelog_1242_li
#Fulltext search: new method SEARCH_DATA that returns the column names and primary keys as arrays.
@changelog_1241_li
@changelog_1243_li
#New experimental optimization for GROUP BY queries if an index can be used that matches the group by columns. To enable this optimization, set the system property h2.optimizeGroupSorted to true.
@changelog_1242_li
@changelog_1244_li
#When using multi-version concurrency (MVCC=TRUE), duplicate rows could appear in the result set when running queries with uncommitted changes in the same session.
@changelog_1243_li
@changelog_1245_li
#H2 Console: remote connections were very slow because getHostName/getRemoteHost was used. Fixed (now using getHostAddress/getRemoteAddr.
@changelog_1244_li
@changelog_1246_li
#H2 Console: on Linux, Firefox, Konqueror, or Opera (in this order) are now started if available. This has been tested on Ubuntu.
@changelog_1245_li
@changelog_1247_li
#H2 Console: the start window works better with IKVM
@changelog_1246_li
@changelog_1248_li
#H2 Console: improved compatibility with Safari (Safari requires keep-alive)
@changelog_1247_li
@changelog_1249_li
#Random: the process didn't stop if generating the random seed using the standard way (SecureRandom.generateSeed) was very slow. Now using a daemon thread to avoid this problem.
@changelog_1248_li
@changelog_1250_li
#SELECT UNION with a different number of ORDER BY columns did throw an ArrayIndexOutOfBoundsException.
@changelog_1249_li
@changelog_1251_li
#When using a view, the column precision was changed to the default scale for some data types.
@changelog_1250_li
@changelog_1252_li
#CSVWRITE now supports a 'null string' that is used for parsing and writing NULL.
@changelog_1251_li
@changelog_1253_li
#Some long running queries could not be canceled.
@changelog_1252_li
@changelog_1254_li
#Queries with many outer join tables were very slow. Fixed.
@changelog_1253_li
@changelog_1255_li
#The performance of text comparison has been improved when using locale sensitive string comparison (SET COLLATOR). Now CollationKey is used with a LRU cache. The default cache size is 10000, and can be changed using the system property h2.collatorCacheSize. Use 0 to disable the cache.
@changelog_1254_li
@changelog_1256_li
#UPDATE SET column=DEFAULT is now supported.
@changelog_1255_h2
@changelog_1257_h2
#Version 1.0.67 (2008-02-22)
@changelog_1256_li
@changelog_1258_li
#New function FILE_READ to read a file or from an URL. Both binary and text data is supported.
@changelog_1257_li
@changelog_1259_li
#CREATE TABLE AS SELECT now supports specifying the column list and data types.
@changelog_1258_li
@changelog_1260_li
#Connecting to a TCP server and at shutting it down at the same time could cause a Java level deadlock.
@changelog_1259_li
@changelog_1261_li
#A user now has all rights on his own local temporary tables.
@changelog_1260_li
@changelog_1262_li
#The CSV tool now supports a custom lineSeparator.
@changelog_1261_li
@changelog_1263_li
#When using multiple connections, empty space was reused too early sometimes. This could corrupt the database when recovering.
@changelog_1262_li
@changelog_1264_li
#The H2 Console has been translated to Dutch. Thanks a lot to Remco Schoen!
@changelog_1263_li
@changelog_1265_li
#Databases can now be opened even if trigger classes are not in the classpath. The exception is thrown when trying to fire the trigger.
@changelog_1264_li
@changelog_1266_li
#Opening databases with ACCESS_MODE_DATA=r is now supported. In this case the database is read-only, but the files don't not need to be read-only.
@changelog_1265_li
@changelog_1267_li
#Security: The database now waits 200 ms before throwing an exception if the user name or password don't match, to slow down dictionary attacks.
@changelog_1266_li
@changelog_1268_li
#The value cache is now a soft reference cache. This should help save memory.
@changelog_1267_li
@changelog_1269_li
#CREATE INDEX on a table with many rows could run out of memory. Fixed.
@changelog_1268_li
@changelog_1270_li
#Large result sets are now a bit faster.
@changelog_1269_li
@changelog_1271_li
#ALTER TABLE ALTER COLUMN RESTART and ALTER SEQUENCE now support parameters (any expressions).
@changelog_1270_li
@changelog_1272_li
#When setting the base directory on the command line, the user directory prefix ('~') was ignored.
@changelog_1271_li
@changelog_1273_li
#The DbStarter servlet didn't start the TCP listener even if configured.
@changelog_1272_li
@changelog_1274_li
#Statement.setQueryTimeout() is now supported.
@changelog_1273_li
@changelog_1275_li
#New session setting QUERY_TIMEOUT, and new system property h2.maxQueryTimeout.
@changelog_1274_li
@changelog_1276_li
#Changing the transaction log level (SET LOG) is now written to the trace file by default.
@changelog_1275_li
@changelog_1277_li
#In a SQL script, primary key constraints are now ordered before foreign key constraints.
@changelog_1276_li
@changelog_1278_li
#It was not possible to create a referential constraint to a table in a different schema in some situations.
@changelog_1277_li
@changelog_1279_li
#The H2 Console was slow when the database contains many tables. Now the column names are not shown in this case.
@changelog_1278_h2
@changelog_1280_h2
#Version 1.0.66 (2008-02-02)
@changelog_1279_li
@changelog_1281_li
#There is a new online error analyzer tool.
@changelog_1280_li
@changelog_1282_li
#H2 Console: stack traces are now links to the source code in the source repository (H2 database only).
@changelog_1281_li
@changelog_1283_li
#CHAR data type equals comparison was case insensitive instead of case sensitive.
@changelog_1282_li
@changelog_1284_li
#The exception 'Value too long for column' now includes the data.
@changelog_1283_li
@changelog_1285_li
#The table name was missing in the documentation of CREATE INDEX.
@changelog_1284_li
@changelog_1286_li
#Better support for IKVM (www.ikvm.net): the H2 Console now opens a browser window.
@changelog_1285_li
@changelog_1287_li
#The cache size was not correctly calculated for tables with large objects (specially if compression is used). This could lead to out-of-memory exceptions.
@changelog_1286_li
@changelog_1288_li
#The exception "Hexadecimal string contains non-hex character" was not always thrown when it should have been. Fixed.
@changelog_1287_li
@changelog_1289_li
#The H2 Console now provides a link to the documentation when an error occurs (H2 databases only so far).
@changelog_1288_li
@changelog_1290_li
#The acting as PostgreSQL server, when a base directory was set, and the H2 Console was started as well, the base directory was applied twice.
@changelog_1289_li
@changelog_1291_li
#Calling EXTRACT(HOUR FROM ...) or EXTRACT(HH FROM ...) returned the wrong values (0 to 11 instead of 0 to 23). All other tested databases return values from 0 to 23. Please check if your application relies on the old behavior before upgrading.
@changelog_1290_li
@changelog_1292_li
#For compatibility with other databases the column default (COLUMN_DEF) for columns without default is now null (it was an empty string).
@changelog_1291_li
@changelog_1293_li
#Statements that contain very large subqueries (where the subquery result does not fit in memory) are now faster.
@changelog_1292_li
@changelog_1294_li
#Variables: large objects (CLOB and BLOB) that don't fit in memory did not work correctly when used as variables.
@changelog_1293_li
@changelog_1295_li
#Fulltext search is now supported in named in-memory databases.
@changelog_1294_li
@changelog_1296_li
#H2 Console: multiple consecutive spaces in the setting name did not work. Fixed.
@changelog_1295_h2
@changelog_1297_h2
#Version 1.0.65 (2008-01-18)
@changelog_1296_li
@changelog_1298_li
#The build (ant) now automatically switches the source code to the correct version (JDK 1.4/1.5 or 1.6).
@changelog_1297_li
@changelog_1299_li
#A recovery bug has been fixed. With older versions, it was necessary to add ;RECOVER=1 to the database URL in cases where it should not have been required.
@changelog_1298_li
@changelog_1300_li
#The performance for DROP and DROP ALL OBJECTS has been improved.
@changelog_1299_li
@changelog_1301_li
#The ChangePassword API has been improved.
@changelog_1300_li
@changelog_1302_li
#User defined variables are now supported. Examples: SET @VAR=10;CALL @VAR. This can be used for running totals as in: select x, set(@t, ifnull(@t, 0) + x) from system_range(1, 10)
@changelog_1301_li
@changelog_1303_li
#The Ukrainian translation has been improved.
@changelog_1302_li
@changelog_1304_li
#CALL statements can now be used in batch updates and called using Statement.executeUpdate.
@changelog_1303_li
@changelog_1305_li
#New read-only setting CREATE_BUILD (the build number of the database engine that created the database).
@changelog_1304_li
@changelog_1306_li
#The optimizer did not use multi column indexes for range queries in some cases. Fixed.
@changelog_1305_li
@changelog_1307_li
#The H2 Console now calls DataSource.getConnection() instead of DataSource.getConnection(user, password) when user name and password are not specified.
@changelog_1306_li
@changelog_1308_li
#The bind IP address can now be set when using multi-homed host (if multiple network adapters are available) using the system property h2.bindAddress.
@changelog_1307_li
@changelog_1309_li
#Batch update: Calling BatchUpdateException.printStackTrace() could result in out of memory. Fixed.
@changelog_1308_li
@changelog_1310_li
#Indexes of unique or foreign constraints where not dropped when the constraint was dropped after altering the table (for example dropping a column). Fixed.
@changelog_1309_li
@changelog_1311_li
#The performance for large result sets in the server mode has been improved.
@changelog_1310_li
@changelog_1312_li
#The setting h2.serverSmallResultSetSize has been renamed to h2.serverResultSetFetchSize.
@changelog_1311_li
@changelog_1313_li
#The SCRIPT command now uses multi-row insert statements to save space except if the option SIMPLE is used.
@changelog_1312_li
@changelog_1314_li
#The SCRIPT command did not split up CLOB data correctly. Fixed.
@changelog_1313_li
@changelog_1315_li
#Optimization for single column distinct queries with an index: select distinct name from test. Can be disabled by setting the system property h2.optimizeDistinct to false.
@changelog_1314_li
@changelog_1316_li
#DROP ALL OBJECTS did not drop user defined aggregate functions and domains.
@changelog_1315_li
@changelog_1317_li
#PostgreSQL compatibility: COUNT(T.*) is now supported.
@changelog_1316_li
@changelog_1318_li
#LIKE comparisons are now faster.
@changelog_1317_li
@changelog_1319_li
#Encrypted databases are now faster.
@changelog_1318_h2
@changelog_1320_h2
#Version 1.0.64 (2007-12-27)
@changelog_1319_li
@changelog_1321_li
#3-way union queries with prepared statement or views could return the wrong results. Fixed.
@changelog_1320_li
@changelog_1322_li
#The PostgreSQL ODBC driver did not work in the last release due to a parser regression. Fixed.
@changelog_1321_li
@changelog_1323_li
#CSV tool: some escape/separator character combinations did not work. Fixed.
@changelog_1322_li
@changelog_1324_li
#CSV tool: the character # could not be used as a separator when reading.
@changelog_1323_li
@changelog_1325_li
#Recovery: when the index file is corrupt, now the database deletes it and re-creates it automatically.
@changelog_1324_li
@changelog_1326_li
#The MVCC mode did not work well with in-memory databases. Fixed.
@changelog_1325_li
@changelog_1327_li
#The FTP server now supports a event listener. Thanks Fulvio Biondi for the help!
@changelog_1326_li
@changelog_1328_li
#New system function CANCEL_SESSION to cancel the currently executing statement of another session.
@changelog_1327_li
@changelog_1329_li
#The database now supports an exclusive mode. In exclusive mode, new connections are rejected.
@changelog_1328_li
@changelog_1330_li
#H2 Console: when editing result sets, columns can now be set to null. The text 'null' must be escaped using '=null'.
@changelog_1329_li
@changelog_1331_li
#New built-in functions RPAD and LPAD.
@changelog_1330_li
@changelog_1332_li
#New meta data table INFORMATION_SCHEMA.SESSIONS and LOCKS to get information about active connections and locks. Admins will see all connections, non-admins only their own session.
@changelog_1331_li
@changelog_1333_li
#The Ukrainian translation was not working in the last release. Fixed.
@changelog_1332_li
@changelog_1334_li
#Creating many tables (many hundreds) was slow. Fixed.
@changelog_1333_li
@changelog_1335_li
#Opening a database with many indexes (thousands) was slow. Fixed.
@changelog_1334_li
@changelog_1336_li
#H2 Console / autocomplete: Ctrl+Space now shows the list in all modes.
@changelog_1335_li
@changelog_1337_li
#The method Trigger.init has been changed: the parameters 'before' and 'type', have been added to the init method.
@changelog_1336_li
@changelog_1338_li
#The performance has been improved for ResultSet methods with column name.
@changelog_1337_li
@changelog_1339_li
#A stack trace was thrown if the system did not provide a quick secure random source and if there is no network or the network settings are not configured. Fixed.
@changelog_1338_li
@changelog_1340_li
#The H2 Console has been translated to Turkish. Thanks a lot to Ridvan Agar!
@changelog_1339_li
@changelog_1341_li
#Improved debugging support: toString methods of most object now return a meaningful text.
@changelog_1340_li
@changelog_1342_li
#The classes DbStarter and WebServlet have been moved to src/main.
@changelog_1341_li
@changelog_1343_li
#The column INFORMATION_SCHEMA.TRIGGERS.SQL now contains the CREATE TRIGGER statement.
@changelog_1342_li
@changelog_1344_li
#Loading classes and calling methods can be restricted using the new system property h2.allowedClasses.
@changelog_1343_li
@changelog_1345_li
#The database could not be used in Java applets due to security exceptions. Fixed.
@download_1000_h1
...
...
@@ -5554,75 +5560,81 @@ Sourceファイル
#A free, light-weight, java data access framework released under GPL.
@links_1164_a
#Shellbook
#ShapeLogic
@links_1165_p
#Desktop publishing application.
#Toolkit for declarative programming, image processing and computer vision.
@links_1166_a
#Signsoft intelliBO
#Shellbook
@links_1167_p
#Persistence middleware supporting the JDO specification.
#Desktop publishing application.
@links_1168_a
#SimpleORM
#Signsoft intelliBO
@links_1169_p
#Simple Java Object Relational Mapping.
#Persistence middleware supporting the JDO specification.
@links_1170_a
#SmartFoxServer
#SimpleORM
@links_1171_p
#Platform for developing multiuser applications and games with Macromedia Flash.
#Simple Java Object Relational Mapping.
@links_1172_a
#StorYBook
#SmartFoxServer
@links_1173_p
#A summary-based tool for novelist and script writers. It helps to keep the overview over the various traces a story has.
#Platform for developing multiuser applications and games with Macromedia Flash.
@links_1174_a
#StreamCruncher
#StorYBook
@links_1175_p
#Event (stream) processing kernel.
#A summary-based tool for novelist and script writers. It helps to keep the overview over the various traces a story has.
@links_1176_a
#Tamava
#StreamCruncher
@links_1177_p
#Newsgroups Reader.
#Event (stream) processing kernel.
@links_1178_a
#Tune Backup
#Tamava
@links_1179_p
#Easy-to-use backup solution for your iTunes library.
#Newsgroups Reader.
@links_1180_a
#weblica
#Tune Backup
@links_1181_p
#Desktop CMS.
#Easy-to-use backup solution for your iTunes library.
@links_1182_a
#Web of Web
#weblica
@links_1183_p
#Collaborative and realtime interactive media platform for the web.
#Desktop CMS.
@links_1184_a
#Werkzeugkasten
#Web of Web
@links_1185_p
#Minimum Java Toolset.
#Collaborative and realtime interactive media platform for the web.
@links_1186_a
#Volunteer database
#Werkzeugkasten
@links_1187_p
#Minimum Java Toolset.
@links_1188_a
#Volunteer database
@links_1189_p
#A database front end to register volunteers, partnership and donation for a Non Profit organization.
@mainWeb_1000_h1
...
...
@@ -8127,13 +8139,16 @@ SQLコマンドがコマンドエリアに表示されます。
@roadmap_1353_li
#AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
@roadmap_1354_h2
@roadmap_1354_li
#Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
@roadmap_1355_h2
#Not Planned
@roadmap_1355_li
@roadmap_1356_li
#HSQLDB (did) support this: select id i from test where i>0 (other databases don't). Supporting it may break compatibility.
@roadmap_1356_li
@roadmap_1357_li
#String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
#When the web application is stopped, the database connection will be closed automatically. If the server is started within the DbStarter, it will also be stopped automatically when the web application is stopped.
@tutorial_1107_h2
CSV (Comma Separated Values) サポート
@tutorial_1107_h3
#Using the H2 Console Servlet
@tutorial_1108_p
#The H2 Console is a standalone application and includes its own web server, but it can be used as a servlet as well. To do that, include the the h2 jar file in your application, and add the following configuration to your web.xml:
@tutorial_1109_p
#For details, see also <code>src/tools/WEB-INF/web.xml</code> .
@tutorial_1110_p
#To create a web application that creates just the H2 Console, run the following command:
#This database comes with a number of command line tools. To get more information about a tool, start it with the parameter '-?', for example:
@tutorial_1131_p
@tutorial_1135_p
#The command line tools are:
@tutorial_1132_b
@tutorial_1136_b
バックアップ
@tutorial_1133_li
@tutorial_1137_li
#creates a backup of a database.
@tutorial_1134_b
@tutorial_1138_b
#ChangeFileEncryption
@tutorial_1135_li
@tutorial_1139_li
#allows changing the file encryption password or algorithm of a database.
@tutorial_1136_b
@tutorial_1140_b
#Console
@tutorial_1137_li
@tutorial_1141_li
#starts the browser based H2 Console.
@tutorial_1138_b
@tutorial_1142_b
#ConvertTraceFile
@tutorial_1139_li
@tutorial_1143_li
#converts a .trace.db file to a Java application and SQL script.
@tutorial_1140_b
@tutorial_1144_b
#CreateCluster
@tutorial_1141_li
@tutorial_1145_li
#creates a cluster from a standalone database.
@tutorial_1142_b
@tutorial_1146_b
#DeleteDbFiles
@tutorial_1143_li
@tutorial_1147_li
#deletes all files belonging to a database.
@tutorial_1144_b
@tutorial_1148_b
#Script
@tutorial_1145_li
@tutorial_1149_li
#allows converting a database to a SQL script for backup or migration.
@tutorial_1146_b
@tutorial_1150_b
#Recover
@tutorial_1147_li
@tutorial_1151_li
#helps recovering a corrupted database.
@tutorial_1148_b
@tutorial_1152_b
#Restore
@tutorial_1149_li
@tutorial_1153_li
#restores a backup of a database.
@tutorial_1150_b
@tutorial_1154_b
#RunScript
@tutorial_1151_li
@tutorial_1155_li
#runs a SQL script against a database.
@tutorial_1152_b
@tutorial_1156_b
Server
@tutorial_1153_li
@tutorial_1157_li
#is used in the server mode to start a H2 server.
@tutorial_1154_b
@tutorial_1158_b
#Shell
@tutorial_1155_li
@tutorial_1159_li
#is a command line database tool.
@tutorial_1156_p
@tutorial_1160_p
#The tools can also be called from an application by calling the main or another public methods. For details, see the Javadoc documentation.
@tutorial_1157_h2
@tutorial_1161_h2
OpenOffice Baseを使用する
@tutorial_1158_p
@tutorial_1162_p
OpenOffice.org Base はJDBC API上のデータベースアクセスをサポートしています。 OpenOffice Baseを使ってH2データベースに接続するためには、最初にOpenOfficeにJDBCドライバを追加する必要があります。H2データベースに接続する手順:
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#Start OpenOffice Writer, go to [Tools], [Options]
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#Make sure you have selected a Java runtime environment in OpenOffice.org / Java
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#Click [Class Path...], [Add Archive...]
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#Select your h2.jar (location is up to you, could be wherever you choose)
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#Click [OK] (as much as needed), stop OpenOffice (including the Quickstarter)
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OpenOffice Base を起動する
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存在するデータベースに接続し、JDBCを選択し、[Next] をクリックする
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#Example datasource URL: jdbc:h2:~/test
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JDBCドライバクラス: org.h2.Driver
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#Now you can access the database stored in the current users home directory.
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#To use H2 in NeoOffice (OpenOffice without X11):
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#In NeoOffice, go to [NeoOffice], [Preferences]
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#Look for the page under [NeoOffice], [Java]
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#Click [Classpath], [Add Archive...]
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#Select your h2.jar (location is up to you, could be wherever you choose)
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#Click [OK] (as much as needed), restart NeoOffice.
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#Now, when creating a new database using the "Database Wizard":
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#Select "connect to existing database" and the type "jdbc". Click next.
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#Enter your h2 database URL. The normal behavior of H2 is that a new db is created if it doesn't exist.
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#Next step - up to you... you can just click finish and start working.
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#Another solution to use H2 in NeoOffice is:
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#Package the h2 jar within an extension package
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#Install it as a Java extension in NeoOffice
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#This can be done by create it using the NetBeans OpenOffice plugin. See also <a href="http://wiki.services.openoffice.org/wiki/Extensions_development_java">Extensions Development</a> .
#For many databases, opening a connection is slow, and it is a good idea to use a connection pool to re-use connections. For H2 however opening a connection usually is fast if the database is already open. Using a connection pool for H2 actually slows down the process a bit, except if file encryption is used (in this case opening a connection is about half as fast as using a connection pool). A simple connection pool is included in H2. It is based on the <a href="http://www.source-code.biz/snippets/java/8.htm">Mini Connection Pool Manager</a> from Christian d'Heureuse. There are other, more complex connection pools available, for example <a href="http://jakarta.apache.org/commons/dbcp/">DBCP</a> . The build-in connection pool is used as follows:
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フルテキストサーチ
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H2はLuceneフルテキストサーチとnativeフルテキストサーチの実装をサポートしています。
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Nativeフルテキストサーチを使用する
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初期化するには、次を呼び出します:
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#You need to initialize it in each database where you want to use it. Afterwards, you can create a full text index for a table using:
#To use the Lucene full text search, you need the Lucene library in the classpath. How his is done depends on the application; if you use the H2 Console, you can add the Lucene jar file to the environment variables H2DRIVERS or CLASSPATH. To initialize the Lucene full text search in a database, call:
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#You need to initialize it in each database where you want to use it. Afterwards, you can create a full text index for a table using:
#This database supports user-defined variables. Variables start with @ and can be used wherever expressions or parameters are used. Variables not persisted and session scoped, that means only visible for the session where they are defined. A value is usually assigned using the SET command:
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#It is also possible to change a value using the SET() method. This is useful in queries:
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#Variables that are not set evaluate to NULL. The data type of a user-defined variable is the data type of the value assigned to it, that means it is not necessary (or possible) to declare variable names before using them. There are no restrictions on the assigned values; large objects (LOBs) are supported as well.
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#Date and Time
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#Date, time and timestamp values support ISO 8601 formatting, including time zone:
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#If the time zone is not set, the value is parsed using the current time zone setting of the system. Date and time information is stored in H2 database files in GMT (Greenwich Mean Time). If the database is opened using another system time zone, the date and time will change accordingly. If you want to move a database from one time zone to the other and don't want this to happen, you need to create a SQL script file using the SCRIPT command or Script tool, and then load the database using the RUNSCRIPT command or the RunScript tool in the new time zone.
