Hibernate annoation (three-ID generator)

ID Generation:

ID generator visible code not available within hibernate

Using @generatedvalue

1 can be used at the same time for different databases

　　@Id
　　　　@GeneratedValue(strategy　=　GenerationType.AUTO)

2 for MySQL

　@Id
　@GeneratedValue(strategy　=　GenerationType.IDENTITY)

3 for Oracle

　　@Id
　　　　@GeneratedValue(strategy　=　GenerationType.SEQUENCE,generator="s_gen")
　　　　@SequenceGenerator(name="s_gen",sequenceName="s_seq")

Description: The Strategy property of @GeneratedValue () supports the ID generator in 5: In addition to the above 3 Chinese and foreign generationtype.table

2 with the use of @genericgenerator not used alone

ID generator visible code not available within hibernate

GENERATORS.put(　"uuid",　UUIDHexGenerator.class　);
　GENERATORS.put(　"hilo",　TableHiLoGenerator.class　);
　GENERATORS.put(　"assigned",　Assigned.class　);
　GENERATORS.put(　"identity",　IdentityGenerator.class　);
　GENERATORS.put(　"select",　SelectGenerator.class　);
　GENERATORS.put(　"sequence",　SequenceGenerator.class　);
　GENERATORS.put(　"seqhilo",　SequenceHiLoGenerator.class　);
　GENERATORS.put(　"increment",　IncrementGenerator.class　);
　GENERATORS.put(　"foreign",　ForeignGenerator.class　);
　GENERATORS.put(　"guid",　GUIDGenerator.class　);
　GENERATORS.put(　"uuid.hex",　UUIDHexGenerator.class　);　//　uuid.hex　is　deprecated
　GENERATORS.put(　"sequence-identity",　SequenceIdentityGenerator.class　);
)

If you want different tables to use the same primary key generator, you can set the Name property of his generator to the same

For example:

@GeneratedValue(name="id1")
@GenericGenerator(name="id1",strategy="identity")