Module eclipselink

Package org.eclipse.persistence.annotations

Enum OptimisticLockingType

java.lang.Object

java.lang.Enum<OptimisticLockingType>

org.eclipse.persistence.annotations.OptimisticLockingType

All Implemented Interfaces:

Serializable, Comparable<OptimisticLockingType>

public enum OptimisticLockingType
extends Enum<OptimisticLockingType>

An enum that is used within the OptimisticLocking annotation.

See Also:

OptimisticLocking

Author:

Guy Pelletier

Since:

Oracle TopLink 11.1.1.0.0

Enum Constant Summary

Enum Constants

Enum Constant	Description
ALL_COLUMNS	Using this type of locking policy compares every field in the table in the WHERE clause when doing an update or a delete.
CHANGED_COLUMNS	Using this type of locking policy compares only the changed fields in the WHERE clause when doing an update.
SELECTED_COLUMNS	Using this type of locking compares selected fields in the WHERE clause when doing an update or a delete.
VERSION_COLUMN	Using this type of locking policy compares a single version number in the where clause when doing an update.

Method Summary

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

ALL_COLUMNS

public static final OptimisticLockingType ALL_COLUMNS

Using this type of locking policy compares every field in the table in the WHERE clause when doing an update or a delete. If any field has been changed, an optimistic locking exception will be thrown.

CHANGED_COLUMNS

public static final OptimisticLockingType CHANGED_COLUMNS

Using this type of locking policy compares only the changed fields in the WHERE clause when doing an update. If any field has been changed, an optimistic locking exception will be thrown. A delete will only compare the primary key.

SELECTED_COLUMNS

public static final OptimisticLockingType SELECTED_COLUMNS

Using this type of locking compares selected fields in the WHERE clause when doing an update or a delete. If any field has been changed, an optimistic locking exception will be thrown. Note that the fields specified must be mapped and not be primary keys.

VERSION_COLUMN

public static final OptimisticLockingType VERSION_COLUMN

Using this type of locking policy compares a single version number in the where clause when doing an update. The version field must be mapped and not be the primary key.

Method Detail

values

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

Returns:

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

valueOf

public static OptimisticLockingType 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