Refresh Your Java - Before Java Interview
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There are so many ways of generating Ids in
Hibernate , but the following are
mostly used
increment
Generates
identifiers of type long, short or int that are unique only when
no other
process is inserting data into the same table.
Do not use in a cluster.
identity
Supports identity columns in DB2, MySQL, MS SQL Server, Sybase and
HypersonicSQL.
The returned identifier is of type long,
short or int.
sequence
Uses a sequence in
DB2, PostgreSQL, Oracle, SAP DB, McKoi or a generator in
Interbase.
The returned identifier is of type long,
short or int
<id name="id"
type="long"
column="cat_id">
<generator
class="org.hibernate.id.TableHiLoGenerator">
<param
name="table">uid_table</param>
<param
name="column">next_hi_value_column</param>
</generator>
</id>
<id name="id"
type="long"
column="person_id">
<generator
class="sequence">
<param
name="sequence">person_id_sequence</param>
</generator>
</id>
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