Top Description Constructors Methods
org.hibernate.dialect.lock

public Class SelectLockingStrategy

extends AbstractSelectLockingStrategy
Class Inheritance
Known Direct Subclasses
org.hibernate.dialect.HSQLDialect.ReadUncommittedLockingStrategy
Imports
org.hibernate.LockOptions, .StaleObjectStateException, .JDBCException, .LockMode, org.hibernate.persister.entity.Lockable, org.hibernate.engine.SessionImplementor, .SessionFactoryImplementor, org.hibernate.sql.SimpleSelect, org.hibernate.pretty.MessageHelper, org.hibernate.exception.JDBCExceptionHelper, java.io.Serializable, java.sql.PreparedStatement, .ResultSet, .SQLException
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.

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

Constructor Summary

AccessConstructor and Description
public
SelectLockingStrategy(Lockable
The metadata for the entity to be locked.
lockable, LockMode
Indictates the type of lock to be acquired.
lockMode)

Construct a locking strategy based on SQL SELECT statements.

Method Summary

Modifier and TypeMethod and Description
protected String
generateLockString(int timeout)

Implements abstract org.hibernate.dialect.lock.AbstractSelectLockingStrategy.generateLockString.

public void
lock(Serializable
The id of the row to be locked
id, Object
The current version (or null if not versioned)
version, Object
The object logically being locked (currently not used)
object, int
timeout in milliseconds, 0 = no wait, -1 = wait indefinitely
timeout, SessionImplementor
The session from which the lock request originated
session)

Implements org.hibernate.dialect.lock.LockingStrategy.lock.

Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.
Inherited from org.hibernate.dialect.lock.AbstractSelectLockingStrategy:
determineSqlgetLockablegetLockModegetNoWaitSql

Constructor Detail

SelectLockingStrategyback to summary
public SelectLockingStrategy(Lockable lockable, LockMode lockMode)

Construct a locking strategy based on SQL SELECT statements.

Parameters
lockable:Lockable

The metadata for the entity to be locked.

lockMode:LockMode

Indictates the type of lock to be acquired.

Method Detail

generateLockStringback to summary
protected String generateLockString(int timeout)

Implements abstract org.hibernate.dialect.lock.AbstractSelectLockingStrategy.generateLockString.

lockback to summary
public void lock(Serializable id, Object version, Object object, int timeout, SessionImplementor session) throws StaleObjectStateException, JDBCException

Implements org.hibernate.dialect.lock.LockingStrategy.lock.

Doc from org.hibernate.dialect.lock.LockingStrategy.lock.

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

Parameters
id:Serializable

The id of the row to be locked

version:Object

The current version (or null if not versioned)

object:Object

The object logically being locked (currently not used)

timeout:int

timeout in milliseconds, 0 = no wait, -1 = wait indefinitely

session:SessionImplementor

The session from which the lock request originated

Exceptions
StaleObjectStateException:
Indicates an optimistic lock failure as part of acquiring the requested database lock.
JDBCException:
Indicates errors from the JDBC driver.
See Also
LockingStrategy#lock