javax.persistence

注释类型 GeneratedValue

@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;
 

从以下版本开始:

Java Persistence 1.0

另请参阅:

Id

可选元素概要

可选元素

限定符和类型	可选元素和说明
java.lang.String	generator 已过时。
GenerationType	strategy 已过时。

元素详细资料

strategy

@Deprecated
public abstract GenerationType strategy

已过时。

(Optional) The primary key generation strategy that the persistence provider must use to generate the annotated entity primary key.

返回:

GenerationType

默认值:

javax.persistence.GenerationType.AUTO

generator

@Deprecated
public abstract java.lang.String generator

已过时。

(Optional) The name of the primary key generator to use as specified in the SequenceGenerator or TableGenerator annotation.

Defaults to the id generator supplied by persistence provider.

返回:

String

默认值:

""