Module jakarta.persistence

Package jakarta.persistence

Enum Class GenerationType

java.lang.Object

java.lang.Enum<GenerationType>

jakarta.persistence.GenerationType

All Implemented Interfaces:

Serializable, Comparable<GenerationType>, Constable

public enum GenerationType
extends Enum<GenerationType>

Enumerates the defined primary key generation strategies.

Since:

1.0

See Also:

• GeneratedValue

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
AUTO	Indicates that the persistence provider should pick an appropriate strategy for the particular database.
IDENTITY	Indicates that the persistence provider must assign primary keys for the entity using a database identity column.
SEQUENCE	Indicates that the persistence provider must assign primary keys for the entity using a database sequence.
TABLE	Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.
UUID	Indicates that the persistence provider must assign primary keys for the entity by generating an RFC 4122 Universally Unique IDentifier.

Method Summary

Modifier and Type	Method	Description
static GenerationType	valueOf(String name)	Returns the enum constant of this class with the specified name.
static GenerationType[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

TABLE

public static final GenerationType TABLE

Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.

May be used to generate primary keys of type Long, Integer, long, or int.

SEQUENCE

public static final GenerationType SEQUENCE

Indicates that the persistence provider must assign primary keys for the entity using a database sequence.

May be used to generate primary keys of type Long, Integer, long, or int.

IDENTITY

public static final GenerationType IDENTITY

Indicates that the persistence provider must assign primary keys for the entity using a database identity column.

May be used to generate primary keys of type Long, Integer, long, or int.

UUID

public static final GenerationType UUID

Indicates that the persistence provider must assign primary keys for the entity by generating an RFC 4122 Universally Unique IDentifier.

May be used to generate primary keys of type UUID or String.

AUTO

public static final GenerationType AUTO

Indicates that the persistence provider should pick an appropriate strategy for the particular database.

• For a primary key of type UUID or String, this is equivalent to UUID.
• For a primary key of type Long, Integer, long, or int, the provider selects between TABLE, SEQUENCE, and IDENTITY.

The AUTO generation strategy may expect a database resource to exist, or it may attempt to create one. A vendor may provide documentation on how to create such resources in the event that it does not support schema generation or cannot create the schema resource at runtime.

Method Details

values

public static GenerationType[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static GenerationType valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null