Hibernate is a powerful, high performance object/relational persistence and query service.

Hibernate 3.1.1 Released

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Hibernate is a powerful, high performance object/relational persistence and query service. Hibernate lets you develop persistent classes following object-oriented idiom - including association, inheritance, polymorphism, composition, and collections. Hibernate allows you to express queries in its own portable SQL extension (HQL), as well as in native SQL, or with an object-oriented Criteria and Example API.

Hibernate 3.1.1 has been released with new features and promises on Jan 13, 2006. This maintenance release focused on bug fixes and improvements, especially regarding:

• SQL Server support
• DML-style HQL (UPDATE, DELETE, INSERT INTO... SELECT)
• Native Query support
• Connection handling

Changes:

• DML-style HQL queries and associations
• FORWARD_ONLY ScrollableResults#next() throw GenericJDBCException
• Set entity in HQL query without prefix -> incorrect SQL
• Session.createFilter(...).iterate() results in bogus column names for result set extraction
• float/double literals not sent to the database correctly
• SchemaUpdate : java.sql.SQLException: You cannot commit during a managed transaction!
• org.hibernate.util.SimpleMRUCache keeps a soft reference to the cache key, so cached values get collected prematurely
• ForeignGenerator does not handle transient entities with an entity-name properly
• Mapped <component> generated column names incorrect with ImprovedNamingStrategy
• HQL delete statement problem due to oracle lacking table aliases in delete clause
• creating temporary table for bulk delete will commit current transaction in managed environment such as J2EE

Improvements:

• Native SQL return-property mapping doesn't support dot-syntax in return-property for components
• Defensive checking of session status
• query.getReturnTypes inconsistent
• better handling of borrowed connections in non-ON_CLOSE release semantics
• schemaupdate does not handle TableHiLoGenerator
• empty property name in mapping file gives imcomprehensible error message
• ANSI-SQL trim function for SQLServer
• ANSI-SQL mod function for SQLServer
• ANSI-SQL bit_length function for SQLServer
• <return-scalar name="blah"/> should be possible
• set autodiscovery flag for SQLQueries when resultsetmappings are used
  

For more details check out the release notes.

Hibernate 3.1 introduced non OLTP features as well as better environment integration:

• Custom strategy for session handling through CurrentSessionContext including 2 default implementations (JTA based and ThreadLocal based session handling)
• more natural and aggressive connection handling in J2EE and J2SE environments
• command-oriented API (StatelessSession API) for operations on huge number of objects
• bulk UPDATE, DELETE, INSERT INTO ... SELECT for multi-table entities
• "extra lazy" collections for huge collection handling
• use of join fetch on collection through scrollable resultsets through break processing
• database generated properties (including database timestamps)
• additional ON clauses for joins
• dirty checking short-cuts for instrumented classes

Hibernate 3.1.1 can be downloaded from here.

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