javax.persistence
Annotation Type SequenceGenerator

@Target(value={TYPE,METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface SequenceGenerator

This annotation defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A sequence generator may be specified on the entity class or on the primary key field or property. The scope of the generator name is global to the persistence unit (across all generator types).

   Example:

   @SequenceGenerator(name="EMP_SEQ", allocationSize=25)
 

Since:

Java Persistence 1.0

Required Element Summary

java.lang.String

name (Required) A unique generator name that can be referenced by one or more classes to be the generator for primary key values.

Optional Element Summary

int	allocationSize (Optional) The amount to increment by when allocating sequence numbers from the sequence.
int	initialValue (Optional) The value from which the sequence object is to start generating.
java.lang.String	sequenceName (Optional) The name of the database sequence object from which to obtain primary key values.

Element Detail

name

public abstract java.lang.String name

(Required) A unique generator name that can be referenced by one or more classes to be the generator for primary key values.

sequenceName

public abstract java.lang.String sequenceName

(Optional) The name of the database sequence object from which to obtain primary key values.

Defaults to a provider-chosen value.

Default:

""

initialValue

public abstract int initialValue

(Optional) The value from which the sequence object is to start generating.

Default:

1

allocationSize

public abstract int allocationSize

(Optional) The amount to increment by when allocating sequence numbers from the sequence.

Default:

50