Overview: In Hibernate there are various ways of defining identifiers for table mapping. However, the following two are the most commonly and widely used strategies based on the underlying database.
identity
supported by DB2, MySQL, MS SQL Server, Sybase and HypersonicSQL.
The returned identifier is of type long, short or int.
sequence
supported by DB2, PostgreSQL, Oracle.
The returned identifier is of type long, short or int.
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