hibernate内不可使用的id生成器

使用@GeneratedValue

1正对不同的数据库可以同时使用

@Id

@GeneratedValue(strategy=GenerationType.AUTO)

2针对mysql

@Id

@GeneratedValue(strategy=GenerationType.IDENTITY)

3针对oracle

@Id

@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="s_gen")

@SequenceGenerator(name="s_gen",sequencename="s_seq")

说明：@GeneratedValue()的strategy属性支持5中id生成器：除上面3中外还有GenerationType.TABLE

2配合使用@GenericGenerator不单独使用

hibernate内不可使用的id生成器可见代码

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.hexisdeprecated

GENERATORS.put("sequence-identity",SequenceIdentityGenerator.class);

)

如果想要不同的表使用相同的主键生成器，可以把他的generator的name属性设为相同即可

例如：

@GeneratedValue(name="id1")

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

 

1、native

 @GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "native")

2、uuid@GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "uuid")

3、hilo

@GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "hilo")

4、assigned@GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "assigned")

5、identity

@GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "identity")

6、select

@GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name="select", strategy="select", parameters = { @Parameter(name = "key", value = "idstoerung") })

7、sequence

Java代码 @GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "sequence", parameters = { @Parameter(name = "sequence", value = "seq_payablemoney") })

8、seqhilo

  @GeneratedValue(generator = "paymentableGenerator") @GenericGenerator(name = "paymentableGenerator", strategy = "seqhilo", parameters = { @Parameter(name = "max_lo", value = "5") })

9、increment

Java代码

@GeneratedValue(generator="paymentableGenerator")@GenericGenerator(name="paymentableGenerator",strategy="increment")