public enum PessimisticLockScope extends Enum<PessimisticLockScope>
javax.persistence.lock.scope
property for pessimistic locking. This
property may be passed as an argument to the methods of the EntityManager
, Query
, and
TypedQuery
interfaces that allow lock modes to be specified or used with the NamedQuery
annotation.Enum Constant and Description |
---|
EXTENDED
In addition to the behavior for
PessimisticLockScope.NORMAL , element collections and
relationships owned by the entity that are contained in join tables will be locked if the
javax.persistence.lock.scope property is specified with a value of
PessimisticLockScope.EXTENDED . |
NORMAL
This value defines the default behavior for pessimistic locking.
|
Modifier and Type | Method and Description |
---|---|
static PessimisticLockScope |
valueOf(String name)
Returns the enum constant of this type with the specified name.
|
static PessimisticLockScope[] |
values()
Returns an array containing the constants of this enum type, in
the order they are declared.
|
public static final PessimisticLockScope NORMAL
The persistence provider must lock the database row(s) that correspond to the non-collection-valued persistent state of that instance. If a joined inheritance strategy is used, or if the entity is otherwise mapped to a secondary table, this entails locking the row(s) for the entity instance in the additional table(s). Entity relationships for which the locked entity contains the foreign key will also be locked, but not the state of the referenced entities (unless those entities are explicitly locked). Element collections and relationships for which the entity does not contain the foreign key (such as relationships that are mapped to join tables or unidirectional one-to-many relationships for which the target entity contains the foreign key) will not be locked by default.
public static final PessimisticLockScope EXTENDED
PessimisticLockScope.NORMAL
, element collections and
relationships owned by the entity that are contained in join tables will be locked if the
javax.persistence.lock.scope
property is specified with a value of
PessimisticLockScope.EXTENDED
. The state of entities referenced by such relationships will
not be locked (unless those entities are explicitly locked). Locking such a relationship or element
collection generally locks only the rows in the join table or collection table for that relationship or
collection. This means that phantoms will be possible.public static PessimisticLockScope[] values()
for (PessimisticLockScope c : PessimisticLockScope.values()) System.out.println(c);
public static PessimisticLockScope valueOf(String name)
name
- the name of the enum constant to be returned.IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is nullCopyright © 2016. All rights reserved.