It provides a framework for mapping an object-oriented domain model to a hibernate 3 in action pdf free download database. Hibernate handles object-relational impedance mismatch problems by replacing direct, persistent database accesses with high-level object handling functions. Hibernate is free software that is distributed under the GNU Lesser General Public License 2.
Hibernate’s primary feature is mapping from Java classes to database tables, and mapping from Java data types to SQL data types. Hibernate also provides data query and retrieval facilities. It generates SQL calls and relieves the developer from the manual handling and object conversion of the result set. The mapping of Java classes to database tables is implemented by the configuration of an XML file or by using Java Annotations.
When using an XML file, Hibernate can generate skeleton source code for the persistence classes. This is auxiliary when annotations are used. Hibernate can use the XML file or the Java annotations to maintain the database schema. There are provided facilities to arrange one-to-many and many-to-many relationships between classes.