程序包 org.hibernate

接口 SimpleNaturalIdLoadAccess<T>

public interface SimpleNaturalIdLoadAccess<T>

Loads an entity by its natural identifier.

作者:

Eric Dalquist, Steve Ebersole

另请参阅:

NaturalId, NaturalIdLoadAccess

方法概要

修饰符和类型	方法	说明
T	getReference(Object naturalIdValue)	Return the persistent instance with the given natural id value, assuming that the instance exists.
T	load(Object naturalIdValue)	Return the persistent instance with the given natural id value, or null if there is no such persistent instance.
Optional<T>	loadOptional(Serializable naturalIdValue)	Same semantic as load(java.lang.Object) except that here Optional is returned to handle nullability.
SimpleNaturalIdLoadAccess<T>	setSynchronizationEnabled(boolean enabled)	For entities with mutable natural ids, should Hibernate perform "synchronization" prior to performing lookups?
SimpleNaturalIdLoadAccess<T>	with(LockOptions lockOptions)	Specify the LockOptions to use when retrieving the entity.

方法详细资料

with

SimpleNaturalIdLoadAccess<T> with(LockOptions lockOptions)

Specify the LockOptions to use when retrieving the entity.

参数:

lockOptions - The lock options to use.

返回:

this, for method chaining

setSynchronizationEnabled

SimpleNaturalIdLoadAccess<T> setSynchronizationEnabled(boolean enabled)

For entities with mutable natural ids, should Hibernate perform "synchronization" prior to performing lookups? The default is to perform "synchronization" (for correctness).

See NaturalIdLoadAccess.setSynchronizationEnabled(boolean) for detailed discussion.

参数:

enabled - Should synchronization be performed? true indicates synchronization will be performed; false indicates it will be circumvented.

返回:

this, for method chaining

getReference

T getReference(Object naturalIdValue)

Return the persistent instance with the given natural id value, assuming that the instance exists. This method might return a proxied instance that is initialized on-demand, when a non-identifier method is accessed. You should not use this method to determine if an instance exists; to check for existence, use load(java.lang.Object) instead. Use this only to retrieve an instance that you assume exists, where non-existence would be an actual error.

参数:

naturalIdValue - The value of the natural-id for the entity to retrieve

返回:

The persistent instance or proxy, if an instance exists. Otherwise, null.

load

T load(Object naturalIdValue)

Return the persistent instance with the given natural id value, or null if there is no such persistent instance. If the instance is already associated with the session, return that instance, initializing it if needed. This method never returns an uninitialized instance.

参数:

naturalIdValue - The value of the natural-id for the entity to retrieve

返回:

The persistent instance or null

loadOptional

Optional<T> loadOptional(Serializable naturalIdValue)

Same semantic as load(java.lang.Object) except that here Optional is returned to handle nullability.

参数:

naturalIdValue - The identifier

返回:

The persistent instance, if one, wrapped in Optional