Module jakarta.persistence

Package jakarta.persistence

Annotation Interface SequenceGenerator

@Repeatable(SequenceGenerators.class)
@Target({TYPE,METHOD,FIELD,PACKAGE})
@Retention(RUNTIME)
public @interface SequenceGenerator

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).

If no name is explicitly specified, and the annotation occurs on an entity class or primary key attribute of an entity class, then the name defaults to the name of the entity.

If no name is explicitly specified, and the annotation occurs on a package descriptor, then the annotation defines a recipe for producing a default generator when a GeneratedValue annotation of any program element in the annotated package has strategy=SEQUENCE and a defaulted generator name. The name of this default generator is the defaulted generator name, and its other properties are determined by the members of the package SequenceGenerator annotation.

Example:

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

Since:

1.0

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
int	allocationSize	(Optional) The amount to increment by when allocating sequence numbers from the sequence.
String	catalog	(Optional) The catalog of the sequence generator.
int	initialValue	(Optional) The value from which the sequence object is to start generating.
String	name	(Optional) A unique generator name that can be referenced by one or more classes to be the generator for primary key values.
String	options	(Optional) A SQL fragment appended to the generated DDL statement which creates this sequence.
String	schema	(Optional) The schema of the sequence generator.
String	sequenceName	(Optional) The name of the database sequence object from which to obtain primary key values.

Element Details

name

String name

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

Defaults to the name of the entity when the annotation occurs on an entity class or primary key attribute.

Default:

""

sequenceName

String sequenceName

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

Defaults to a provider-chosen value.

Default:

""

catalog

String catalog

(Optional) The catalog of the sequence generator.

Since:

2.0

Default:

""

schema

String schema

(Optional) The schema of the sequence generator.

Since:

2.0

Default:

""

initialValue

int initialValue

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

Default:

1

allocationSize

int allocationSize

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

Default:

50

options

String options

(Optional) A SQL fragment appended to the generated DDL statement which creates this sequence.

Since:

3.2

Default:

""