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Hibernate Core Reference Guide
1.2.3.2. Hibernate JDBC and Connection Properties

1.2.3.2. Hibernate JDBC and Connection Properties

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Table 1.2. Properties
Property Name	Description
hibernate.jdbc.fetch_size	A non-zero value that determines the JDBC fetch size (calls `Statement.setFetchSize()`).
hibernate.jdbc.batch_size	A non-zero value enables use of JDBC2 batch updates by Hibernate. The recommended values are between `5` and `30`.
hibernate.jdbc.batch_versioned_data	Boolean. Set this property to `true` if the JDBC driver returns correct row counts from `executeBatch()`. Hibernate will then use batched DML for automatically versioned data. Default value is to `false`.
hibernate.jdbc.factory_class	Select a custom `org.hibernate.jdbc.Batcher`. Most applications will not need this configuration property.
hibernate.jdbc.use_scrollable_resultset	Boolean. Enables use of JDBC2 scrollable resultsets by Hibernate. This property is only necessary when using user-supplied JDBC connections. Hibernate uses connection metadata otherwise.
hibernate.jdbc.use_streams_for_binary	Boolean. This is a system-level property. Use streams when writing/reading `binary` or `serializable` types to/from JDBC.
hibernate.jdbc.use_get_generated_keys	Boolean. Enables use of JDBC3 `PreparedStatement.getGeneratedKeys()` to retrieve natively generated keys after insert. Requires JDBC3+ driver and JRE1.4+. Set to false if JDBC driver has problems with the Hibernate identifier generators. By default, it tries to determine the driver capabilities using connection metadata.
hibernate.connection.provider_class	The classname of a custom `org.hibernate.connection.ConnectionProvider` which provides JDBC connections to Hibernate.
hibernate.connection.isolation	Sets the JDBC transaction isolation level. Check `java.sql.Connection` for meaningful values, but note that most databases do not support all isolation levels and some define additional, non-standard isolations. Standard values are `1, 2, 4, 8`.
hibernate.connection.autocommit	Boolean. This property is not recommended for use. Enables autocommit for JDBC pooled connections.
hibernate.connection.release_mode	Specifies when Hibernate should release JDBC connections. By default, a JDBC connection is held until the session is explicitly closed or disconnected. The default value `auto` will choose `after_statement` for the JTA and CMT transaction strategies, and `after_transaction` for the JDBC transaction strategy. Available values are `auto` (default) \| `on_close` \| `after_transaction` \| `after_statement`. This setting only affects `Session`s returned from `SessionFactory.openSession`. For `Session`s obtained through `SessionFactory.getCurrentSession`, the `CurrentSessionContext` implementation configured for use controls the connection release mode for those `Session`s.
hibernate.connection.<propertyName>	Pass the JDBC property <propertyName> to `DriverManager.getConnection()`.
hibernate.jndi.<propertyName>	Pass the property <propertyName> to the JNDI `InitialContextFactory`.

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