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12.2.4. Configuration


12.2.4.1. Hibernate Configuration Properties

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Table 12.1. Properties
Property Name Description
hibernate.dialect
The classname of a Hibernate org.hibernate.dialect.Dialect. Allows Hibernate to generate SQL optimized for a particular relational database.
In most cases Hibernate will be able to choose the correct org.hibernate.dialect.Dialect implementation, based on the JDBC metadata returned by the JDBC driver.
hibernate.show_sql
Boolean. Writes all SQL statements to console. This is an alternative to setting the log category org.hibernate.SQL to debug.
hibernate.format_sql
Boolean. Pretty print the SQL in the log and console.
hibernate.default_schema
Qualify unqualified table names with the given schema/tablespace in generated SQL.
hibernate.default_catalog
Qualifies unqualified table names with the given catalog in generated SQL.
hibernate.session_factory_name
The org.hibernate.SessionFactory will be automatically bound to this name in JNDI after it has been created. For example, jndi/composite/name.
hibernate.max_fetch_depth
Sets a maximum "depth" for the outer join fetch tree for single-ended associations (one-to-one, many-to-one). A 0 disables default outer join fetching. The recommended value is between 0 and 3.
hibernate.default_batch_fetch_size
Sets a default size for Hibernate batch fetching of associations. The recommended values are 4, 8, and 16.
hibernate.default_entity_mode
Sets a default mode for entity representation for all sessions opened from this SessionFactory. Values include: dynamic-map, dom4j, pojo.
hibernate.order_updates
Boolean. Forces Hibernate to order SQL updates by the primary key value of the items being updated. This will result in fewer transaction deadlocks in highly concurrent systems.
hibernate.generate_statistics
Boolean. If enabled, Hibernate will collect statistics useful for performance tuning.
hibernate.use_identifier_rollback
Boolean. If enabled, generated identifier properties will be reset to default values when objects are deleted.
hibernate.use_sql_comments
Boolean. If turned on, Hibernate will generate comments inside the SQL, for easier debugging. Default value is false.
hibernate.id.new_generator_mappings
Boolean. This property is relevant when using @GeneratedValue. It indicates whether or not the new IdentifierGenerator implementations are used for javax.persistence.GenerationType.AUTO, javax.persistence.GenerationType.TABLE and javax.persistence.GenerationType.SEQUENCE. Default value is true.

Important

For hibernate.id.new_generator_mappings, new applications should keep the default value of true. Existing applications that used Hibernate 3.3.x may need to change it to false to continue using a sequence object or table based generator, and maintain backward compatibility.
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