javax.persistence

Enum GenerationType

java.lang.Object

java.lang.Enum<GenerationType>

javax.persistence.GenerationType

All Implemented Interfaces:

Serializable, Comparable<GenerationType>

public enum GenerationType
extends Enum<GenerationType>

Defines the types of primary key generation strategies.

Since:

Java Persistence 1.0

See Also:

GeneratedValue

Enum Constant Summary

Enum Constants

Enum Constant and 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.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

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.

SEQUENCE

public static final GenerationType SEQUENCE

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

IDENTITY

public static final GenerationType IDENTITY

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

AUTO

public static final GenerationType AUTO

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

values

public static GenerationType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (GenerationType c : GenerationType.values())
    System.out.println(c);

Returns:

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

valueOf

public static GenerationType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null