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H2 DATABASE ENGINE
(REDIRECT)INSTALLATIONDOWNLOADMVSTOREPERFORMANCELINKSSYSTEM TABLES H2 is free SQL database written in Java. Contribute. You can contribute to the development of H2 by sending feedback and bug reports, or translate the H2 Console application (for details, start the H2 Console and select Options / Translate). DATA TYPES - H2 DATABASEDOWNLOADHISTORY & ROADMAPTUTORIALCOMMANDSCHEATSHEETPERFORMANCE
The time with time zone data type. If fractional seconds precision is specified it should be from 0 to 9, 0 is default. See also time with time zone literal grammar. Mapped to java.time.OffsetTime on Java 8 and later versions. Cast from higher fractional seconds precision to lower fractional seconds precision performs round half up; if result of rounding is higher than maximum supported value DOWNLOADS - H2 DATABASE Downloads Version 1.4.200 (2019-10-14) Windows Installer (SHA1 checksum: 12710a463318cf23c0e0e3f7d58a0f232bd39cfe) Platform-Independent Zip (SHA1 checksum COMMANDS - H2 DATABASE Inserts a new row / new rows into a table. When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step.. When using SORTED, b-tree pages are split at the insertion point.This can improve performance and reduce disk usage. Example: INSERT INTO TEST VALUES(1, 'Hello')WINDOW FUNCTIONS
AGGREGATE FUNCTIONS
Returns true if any expression is true. If no rows are selected, the result is NULL.Aggregates are only allowed in select statements. Note that if ANY or SOME aggregate function is placed on the right side of comparison operation and argument of this function is a subquery additional parentheses around aggregate function are required, otherwise it will be parsed as quantified comparison predicate.SYSTEM TABLES
DBSETTINGS - H2 DATABASE DbSettings This class contains various database-level settings. To override the documented default value for a database, append the setting in the database URL: "jdbc:h2:./test;ALIAS_COLUMN_NAME=TRUE" when opening the first connection to the database. FREQUENTLY ASKED QUESTIONS Frequently Asked Questions I Have a Problem or Feature Request Are there Known Bugs? When is the Next Release? Is this Database EngineOpen Source?
JDBCCONNECTIONPOOL
Retrieves a connection from the connection pool. If maxConnections connections are already in use, the method waits until a connection becomes available or timeout seconds elapsed. When the application is finished using the connection, it must close it in order to return itto the pool.
H2 DATABASE ENGINE
(REDIRECT)INSTALLATIONDOWNLOADMVSTOREPERFORMANCELINKSSYSTEM TABLES H2 is free SQL database written in Java. Contribute. You can contribute to the development of H2 by sending feedback and bug reports, or translate the H2 Console application (for details, start the H2 Console and select Options / Translate). DATA TYPES - H2 DATABASEDOWNLOADHISTORY & ROADMAPTUTORIALCOMMANDSCHEATSHEETPERFORMANCE
The time with time zone data type. If fractional seconds precision is specified it should be from 0 to 9, 0 is default. See also time with time zone literal grammar. Mapped to java.time.OffsetTime on Java 8 and later versions. Cast from higher fractional seconds precision to lower fractional seconds precision performs round half up; if result of rounding is higher than maximum supported value DOWNLOADS - H2 DATABASE Downloads Version 1.4.200 (2019-10-14) Windows Installer (SHA1 checksum: 12710a463318cf23c0e0e3f7d58a0f232bd39cfe) Platform-Independent Zip (SHA1 checksum COMMANDS - H2 DATABASE Inserts a new row / new rows into a table. When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step.. When using SORTED, b-tree pages are split at the insertion point.This can improve performance and reduce disk usage. Example: INSERT INTO TEST VALUES(1, 'Hello')WINDOW FUNCTIONS
AGGREGATE FUNCTIONS
Returns true if any expression is true. If no rows are selected, the result is NULL.Aggregates are only allowed in select statements. Note that if ANY or SOME aggregate function is placed on the right side of comparison operation and argument of this function is a subquery additional parentheses around aggregate function are required, otherwise it will be parsed as quantified comparison predicate.SYSTEM TABLES
DBSETTINGS - H2 DATABASE DbSettings This class contains various database-level settings. To override the documented default value for a database, append the setting in the database URL: "jdbc:h2:./test;ALIAS_COLUMN_NAME=TRUE" when opening the first connection to the database. FREQUENTLY ASKED QUESTIONS Frequently Asked Questions I Have a Problem or Feature Request Are there Known Bugs? When is the Next Release? Is this Database EngineOpen Source?
JDBCCONNECTIONPOOL
Retrieves a connection from the connection pool. If maxConnections connections are already in use, the method waits until a connection becomes available or timeout seconds elapsed. When the application is finished using the connection, it must close it in order to return itto the pool.
DATA TYPES - H2 DATABASE The time with time zone data type. If fractional seconds precision is specified it should be from 0 to 9, 0 is default. See also time with time zone literal grammar. Mapped to java.time.OffsetTime on Java 8 and later versions. Cast from higher fractional seconds precision to lower fractional seconds precision performs round half up; if result of rounding is higher than maximum supported value FUNCTIONS - H2 DATABASE Returns the absolute value of a specified value. The returned value is of the same data type as the parameter. Note that TINYINT, SMALLINT, INT, and BIGINT data types cannot represent absolute values of their minimum negative values, because they have more negative values than positive. For example, for INT data type allowed values are from -2147483648 to 2147483647.H2 DATABASE ENGINE
Embedded Mode..60 Server Mode..60 FEATURES - H2 DATABASE The number of seconds until a lock timeout exception is thrown can be set separately for each connection using the SQL command SET LOCK_TIMEOUT .The initial lock timeout (that is the timeout used for new connections) can be set using the SQL command SET DEFAULT_LOCK_TIMEOUT .The default lock timeout is persistent.BUILD - H2 DATABASE
Build Portability Environment Building the Software Build Targets Using Maven 2 Using Eclipse Translating Submitting Source Code Changes Reporting Problems or RequestsINSTALLATION
Directory Contents; bin: JAR and batch files: docs: Documentation: docs/html: HTML pages: docs/javadoc: Javadoc files: ext: External dependencies (downloaded whenARCHITECTURE
Parser. The parser lives in org.h2.command.Parser.It uses a straightforward recursive-descent design. See Wikipedia Recursive descent parser page.. Command execution and planning. Unlike other databases, we do not have an intermediate step where we generate some kind of IR (intermediate representation) of the query.SQL GRAMMAR
The right hand side of a condition. Quantified comparison predicate ALL returns TRUE if specified comparison operation between left size of condition and each row from a subquery returns TRUE, including case when there are no rows.ALL predicate returns FALSE if at least one such comparison returns FALSE.Otherwise it returns NULL.. Quantified comparison predicates ANY and SOME return FREQUENTLY ASKED QUESTIONS Frequently Asked Questions I Have a Problem or Feature Request Are there Known Bugs? When is the Next Release? Is this Database EngineOpen Source?
JDBCCONNECTIONPOOL
Retrieves a connection from the connection pool. If maxConnections connections are already in use, the method waits until a connection becomes available or timeout seconds elapsed. When the application is finished using the connection, it must close it in order to return itto the pool.
H2 DATABASE ENGINE
(REDIRECT)INSTALLATIONDOWNLOADMVSTOREPERFORMANCELINKSSYSTEM TABLES H2 Database Engine. Welcome to H2, the Java SQL database. The main features of H2 are: Very fast, open source, JDBC API. Embedded and server modes; in-memory databases. Browser based Console application. Small footprint: around 2 MB jar file size. DATA TYPES - H2 DATABASEHISTORY & ROADMAPJAQUFUNCTIONSTUTORIALLICENSECOMMANDS Interval data type. If leading field precision is specified it should be from 1 to 18, 2 is default. If fractional seconds precision is specified it should be from 0 to 9, 6 is default. See also day to second interval literal grammar. Mapped to org.h2.api.Interval. java.time.Duration is also supported on Java 8 DOWNLOADS - H2 DATABASE Downloads Version 1.4.200 (2019-10-14) Windows Installer (SHA1 checksum: 12710a463318cf23c0e0e3f7d58a0f232bd39cfe) Platform-Independent Zip (SHA1 checksum COMMANDS - H2 DATABASE Selects data from a table or multiple tables. Command is executed in the following logical order: 1. Data is taken from table value expressions that are specified in the FROM clause, joins are executed. If FROM clause is not specified a single row is constructed. 2.H2 DOCUMENTATION
API Overview JDBC API. Use the JDBC API to connect to a database and execute queries. Tools API. The Tools API can be used to do maintenance operations, such as deleting database files or changing the database file password, that do not require a connection to thedatabase.
TUTORIAL - H2 DATABASE Settings of the H2 Console. The settings of the H2 Console are stored in a configuration file called .h2.server.properties in you user home directory. For Windows installations, the user home directory is usually C:\Documents and Settings\ or C:\Users\.The configuration file contains the settings of the application and is automatically created when the H2 Console isfirst
WINDOW FUNCTIONS
AGGREGATE FUNCTIONS
Returns true if any expression is true. If no rows are selected, the result is NULL.Aggregates are only allowed in select statements. Note that if ANY or SOME aggregate function is placed on the right side of comparison operation and argument of this function is a subquery additional parentheses around aggregate function are required, otherwise it will be parsed as quantified comparison predicate.SYSTEM TABLES
DBSETTINGS - H2 DATABASE DbSettings. This class contains various database-level settings. To override the documented default value for a database, append the setting in the database URL: "jdbc:h2:./test;ALIAS_COLUMN_NAME=TRUE" when opening the first connection to the database. The settings can not be changed once the database is open.H2 DATABASE ENGINE
(REDIRECT)INSTALLATIONDOWNLOADMVSTOREPERFORMANCELINKSSYSTEM TABLES H2 Database Engine. Welcome to H2, the Java SQL database. The main features of H2 are: Very fast, open source, JDBC API. Embedded and server modes; in-memory databases. Browser based Console application. Small footprint: around 2 MB jar file size. DATA TYPES - H2 DATABASEHISTORY & ROADMAPJAQUFUNCTIONSTUTORIALLICENSECOMMANDS Interval data type. If leading field precision is specified it should be from 1 to 18, 2 is default. If fractional seconds precision is specified it should be from 0 to 9, 6 is default. See also day to second interval literal grammar. Mapped to org.h2.api.Interval. java.time.Duration is also supported on Java 8 DOWNLOADS - H2 DATABASE Downloads Version 1.4.200 (2019-10-14) Windows Installer (SHA1 checksum: 12710a463318cf23c0e0e3f7d58a0f232bd39cfe) Platform-Independent Zip (SHA1 checksum COMMANDS - H2 DATABASE Selects data from a table or multiple tables. Command is executed in the following logical order: 1. Data is taken from table value expressions that are specified in the FROM clause, joins are executed. If FROM clause is not specified a single row is constructed. 2.H2 DOCUMENTATION
API Overview JDBC API. Use the JDBC API to connect to a database and execute queries. Tools API. The Tools API can be used to do maintenance operations, such as deleting database files or changing the database file password, that do not require a connection to thedatabase.
TUTORIAL - H2 DATABASE Settings of the H2 Console. The settings of the H2 Console are stored in a configuration file called .h2.server.properties in you user home directory. For Windows installations, the user home directory is usually C:\Documents and Settings\ or C:\Users\.The configuration file contains the settings of the application and is automatically created when the H2 Console isfirst
WINDOW FUNCTIONS
AGGREGATE FUNCTIONS
Returns true if any expression is true. If no rows are selected, the result is NULL.Aggregates are only allowed in select statements. Note that if ANY or SOME aggregate function is placed on the right side of comparison operation and argument of this function is a subquery additional parentheses around aggregate function are required, otherwise it will be parsed as quantified comparison predicate.SYSTEM TABLES
DBSETTINGS - H2 DATABASE DbSettings. This class contains various database-level settings. To override the documented default value for a database, append the setting in the database URL: "jdbc:h2:./test;ALIAS_COLUMN_NAME=TRUE" when opening the first connection to the database. The settings can not be changed once the database is open. DATA TYPES - H2 DATABASE The time with time zone data type. If fractional seconds precision is specified it should be from 0 to 9, 0 is default. See also time with time zone literal grammar. Mapped to java.time.OffsetTime on Java 8 and later versions. Cast from higher fractional seconds precision to lower fractional seconds precision performs round half up; if result of rounding is higher than maximum supported value FUNCTIONS - H2 DATABASE Returns the absolute value of a specified value. The returned value is of the same data type as the parameter. Note that TINYINT, SMALLINT, INT, and BIGINT data types cannot represent absolute values of their minimum negative values, because they have more negative values than positive. For example, for INT data type allowed values are from -2147483648 to 2147483647.INSTALLATION
Installing the Software. To install the software, run the installer or unzip it to a directory of your choice.ARCHITECTURE
Parser. The parser lives in org.h2.command.Parser.It uses a straightforward recursive-descent design. See Wikipedia Recursive descent parser page.. Command execution and planning. Unlike other databases, we do not have an intermediate step where we generate some kind of IR (intermediate representation) of the query.H2 DATABASE ENGINE
Embedded Mode..60 Server Mode..60SQL GRAMMAR
The right hand side of a condition. Quantified comparison predicate ALL returns TRUE if specified comparison operation between left size of condition and each row from a subquery returns TRUE, including case when there are no rows.ALL predicate returns FALSE if at least one such comparison returns FALSE.Otherwise it returns NULL.. Quantified comparison predicates ANY and SOME return QUICKSTART - H2 DATABASE Quickstart Embedding H2 in an Application The H2 Console Application Embedding H2 in an Application. This database can be used in embedded mode, or in server mode.H2 DATABASE ENGINE
H2 is open source , free to use and distribute . Download : jar , installer (Windows) , zip . To start the H2 Console tool, double click the jar file, or run java -jar h2*.jar, h2.bat, or h2.sh . A new database is automatically created by default . Closing the last connection closes the database . FREQUENTLY ASKED QUESTIONS To find out what the problem is, use the H2 Console and click on "Test Connection" instead of "Login". After the "Login Successful" appears, click on it (it's a link). This will list the top stack traces. Then either analyze this yourself, or post those stack traces in the GoogleGroup.
JDBCCONNECTIONPOOL
Connection. getConnection () throws SQLException. Retrieves a connection from the connection pool. If maxConnections connections are already in use, the method waits until a connection becomes available or timeout seconds elapsed. When the application is finished using the connection, it must close it in order to return it to the pool.▲
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H2 DATABASE ENGINE
Welcome to H2, the Java SQL database. The main features of H2 are: * Very fast, open source, JDBC API * Embedded and server modes; in-memory databases * Browser based Console application * Small footprint: around 2 MB jar file sizeDOWNLOAD
Version 1.4.200 (2019-10-14) Windows Installer (5 MB) All Platforms (zip, 8 MB)All Downloads
SUPPORT
Stack Overflow (tag H2) Google Group English, Japanese
For non-technical issues, use: dbsupport at (no spam please) h2database.comFEATURES
H2
DERBY
HSQLDB
MYSQL
POSTGRESQL
Pure Java
Yes
Yes
Yes
No
No
Memory Mode
Yes
Yes
Yes
No
No
Encrypted Database
Yes
Yes
Yes
No
No
ODBC Driver
Yes
No
No
Yes
Yes
Fulltext Search
Yes
No
No
Yes
Yes
Multi Version ConcurrencyYes
No
Yes
Yes
Yes
Footprint (embedded)~2 MB
~3 MB
~1.5 MB
—
—
Footprint (client)
~500 KB
~600 KB
~1.5 MB
~1 MB
~700 KB
NEWS
NEWSFEEDS: Full text (Atom) or Header only (RSS).
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CONTRIBUTE
You can contribute to the development of H2 by sending feedback and bug reports, or translate the H2 Console application (for details, start the H2 Console and select Options / Translate). To donate money, click on the PayPal button below. You will be listed as a supporter:
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