javax.persistence.GeneratedValue Maven / Gradle / Ivy
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package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.GenerationType.AUTO;
/**
* 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 {@link Id} annotation.
*
*
*
* 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;
*
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface GeneratedValue {
/**
* (Optional) The primary key generation strategy
* that the persistence provider must use to
* generate the annotated entity primary key.
*/
GenerationType strategy() default AUTO;
/**
* (Optional) The name of the primary key generator
* to use as specified in the {@link SequenceGenerator}
* or {@link TableGenerator} annotation.
* Defaults to the id generator supplied by persistence provider.
*/
String generator() default "";
}