Module jakarta.persistence

Package jakarta.persistence

Enum Class InheritanceType

java.lang.Object

java.lang.Enum<InheritanceType>

jakarta.persistence.InheritanceType

All Implemented Interfaces:

Serializable, Comparable<InheritanceType>, Constable

public enum InheritanceType
extends Enum<InheritanceType>

Enumerated the options for mapping entity inheritance.

Since:

1.0

See Also:

• Inheritance.strategy()

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
JOINED	A table for each abstract or concrete entity class, with only the columns mapped to persistent fields and properties declared by the entity class.
SINGLE_TABLE	A single table for each entity class hierarchy.
TABLE_PER_CLASS	A table for each concrete entity class.

Method Summary

Modifier and Type	Method	Description
static InheritanceType	valueOf(String name)	Returns the enum constant of this class with the specified name.
static InheritanceType[]	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

SINGLE_TABLE

public static final InheritanceType SINGLE_TABLE

A single table for each entity class hierarchy.

Subclasses are stored together with the root class, and each entity instance is stored as a single table row.

The concrete subclass represented by a row is determined by the value held by a discriminator column.

TABLE_PER_CLASS

public static final InheritanceType TABLE_PER_CLASS

A table for each concrete entity class.

Each concrete class in the hierarchy has its own table, and each entity instance is stored as a single table row.

No discriminator column is necessary.

JOINED

public static final InheritanceType JOINED

A table for each abstract or concrete entity class, with only the columns mapped to persistent fields and properties declared by the entity class.

Each class in the hierarchy has its own table, but that table does not contain columns mapped to inherited fields or properties, and so the state of an entity instance might be stored across multiple table rows. A join is used to retrieve the state of such entities.

Method Details

values

public static InheritanceType[] 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 InheritanceType 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