SelectLockingStrategy (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.dialect.lock
Class SelectLockingStrategy

java.lang.Object
  org.hibernate.dialect.lock.SelectLockingStrategy

All Implemented Interfaces:: LockingStrategy

Direct Known Subclasses:: HSQLDialect.ReadUncommittedLockingStrategy

public class SelectLockingStrategy
extends Object
implements LockingStrategy

A locking strategy where the locks are obtained through select statements.

For non-read locks, this is achieved through the Dialect's specific SELECT ... FOR UPDATE syntax.

Since:: 3.2
Author:: Steve Ebersole
See Also:: Dialect.getForUpdateString(org.hibernate.LockMode), Dialect.appendLockHint(org.hibernate.LockMode, String)

Constructor Summary

SelectLockingStrategy(Lockable lockable, LockMode lockMode)
          Construct a locking strategy based on SQL SELECT statements.

Method Summary

protected String generateLockString()


protected LockMode getLockMode()


void lock(Serializable id, Object version, Object object, SessionImplementor session)
          Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SelectLockingStrategy

public SelectLockingStrategy(Lockable lockable,
                             LockMode lockMode)

Construct a locking strategy based on SQL SELECT statements.
Parameters:: lockable - The metadata for the entity to be locked.; lockMode - Indictates the type of lock to be acquired.

Method Detail

lock

public void lock(Serializable id,
                 Object version,
                 Object object,
                 SessionImplementor session)
          throws StaleObjectStateException,
                 JDBCException

Description copied from interface: LockingStrategy

Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.

Specified by:: lock in interface LockingStrategy

Parameters:: id - The id of the row to be locked; version - The current version (or null if not versioned); object - The object logically being locked (currently not used); session - The session from which the lock request originated
Throws:: StaleObjectStateException - Indicates an optimisitic lock failure as part of acquiring the requested database lock.; JDBCException
See Also:: LockingStrategy.lock(java.io.Serializable, java.lang.Object, java.lang.Object, org.hibernate.engine.SessionImplementor)

getLockMode

protected LockMode getLockMode()

generateLockString

protected String generateLockString()