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July 23, 2008

The no-argument constructor is a requirement for all persistent classes;
native, which picks the best strategy depending on the configured database (dialect).
Hibernate supports database generated, globally unique, as well as application assigned identifiers (or any strategy you have written an extension for).

These types are so called Hibernate mapping types, converters which can translate from Java to SQL data types and vice versa.
Again, Hibernate will try to determine the correct conversion and mapping type itself if the type attribute is not present in the mapping.
In some cases this automatic detection (using Reflection on the Java class) might not have the default you expect or need.
This is the case with the date property. Hibernate can’t know if the property (which is of java.util.Date) should map to a SQL date, timestamp, or time column.

To connect to the database: file, a slightly more sophisticated hibernate.cfg.xml file, or even complete programmatic setup
– Run a simple hibernate application. (Small batch program)  – Along with Junit.?
– Use EhCache along with Hibernate to improve performance.

Hibernate – create 3 files:

1. Hibernate.cfg.xml – has connection setup details (Configuration file)
2. Entity.hbm.xml – has data related to entities. (Mapping file)
3. HibernateUtil – that creates the Session Factory from Configuration file

This thread-bound programming model  allows flexible layering of your code

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