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@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface GeneratedValue
Provides for the specification of generation strategies for the values of primary keys.
The GeneratedValue
annotation
may be applied to a primary key property or field of an entity or
mapped superclass in conjunction with the Id
annotation.
The use of the GeneratedValue
annotation is only
required to be supported for simple primary keys. Use of the
GeneratedValue
annotation is not supported for derived
primary keys.
Example 1: @Id @GeneratedValue(strategy=SEQUENCE, generator="CUST_SEQ") @Column(name="CUST_ID") public Long getId() { return id; } Example 2: @Id @GeneratedValue(strategy=TABLE, generator="CUST_GEN") @Column(name="CUST_ID") Long id;
Id
,
TableGenerator
,
SequenceGenerator
Optional Element Summary | |
---|---|
java.lang.String |
generator
(Optional) The name of the primary key generator to use as specified in the SequenceGenerator
or TableGenerator annotation. |
GenerationType |
strategy
(Optional) The primary key generation strategy that the persistence provider must use to generate the annotated entity primary key. |
public abstract GenerationType strategy
public abstract java.lang.String generator
SequenceGenerator
or TableGenerator
annotation.
Defaults to the id generator supplied by persistence provider.
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Generated on 10-February-2011 12:41