io.ebean.annotation

Enum ConstraintMode

java.lang.Object

java.lang.Enum<ConstraintMode>

io.ebean.annotation.ConstraintMode

All Implemented Interfaces:

Serializable, Comparable<ConstraintMode>

public enum ConstraintMode
extends Enum<ConstraintMode>

Modes for the DbForeignKey onDelete and onUpdate clause of a foreign keys.

Note that we should never change the onUpdate clause as primary keys should never change. Instead review the design ensuring the primary keys are immutable. Always leave the onUpdate mode at it's default of RESTRICT ('No Action').

See Also:

DbForeignKey

Enum Constant Summary

Enum Constants

Enum Constant and Description
CASCADE Cascade - To automatically cascade a delete of a referenced id.
RESTRICT Restrict - The usual default behavior for foreign constraints (also known as 'No Action').
SET_DEFAULT Set the value to 'default' when a referenced id is deleted.
SET_NULL Set the value to null when a referenced id is deleted.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

RESTRICT

public static final ConstraintMode RESTRICT

Restrict - The usual default behavior for foreign constraints (also known as 'No Action').

SET_NULL

public static final ConstraintMode SET_NULL

Set the value to null when a referenced id is deleted.

SET_DEFAULT

public static final ConstraintMode SET_DEFAULT

Set the value to 'default' when a referenced id is deleted.

CASCADE

public static final ConstraintMode CASCADE

Cascade - To automatically cascade a delete of a referenced id.

Method Detail

values

public static ConstraintMode[] 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 (ConstraintMode c : ConstraintMode.values())
    System.out.println(c);

Returns:

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

valueOf

public static ConstraintMode 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