11.2.4. Configuration

11.2.4.1. Hibernate Configuration Properties

Table 11.1. 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 false to keep backward compatibility.

Important

It is recommended that all new projects that use @GeneratedValue also set hibernate.id.new_generator_mappings=true. This is because the new generators are more efficient and closer to the JPA 2 specification semantic.
However, they are not backward compatible with existing databases (if a sequence or a table is used for id generation).