Package org.hibernate.sql.ast.spi

Interface LockingClauseStrategy

All Known Implementing Classes:

NonLockingClauseStrategy, StandardLockingClauseStrategy

public interface LockingClauseStrategy

Strategy for dealing with locking via a SQL FOR UPDATE (OF) clause.

Some dialects do not use a FOR UPDATE (OF) to apply locks - e.g., they apply locks in the FROM clause. Such dialects would return a no-op version of this contract.

Some dialects support an additional FOR SHARE (OF) clause as well to acquire non-exclusive locks. That is also handled here, varied by the requested LockMode.

Operates in 2 "phases"-

1. collect tables which are to be locked (based on Locking.Scope, and other things)
2. render the appropriate locking fragment

See Also:

• Dialect.getLockingClauseStrategy(org.hibernate.sql.ast.tree.select.QuerySpec, org.hibernate.LockOptions)

Method Summary

Modifier and Type	Method	Description
boolean	containsOuterJoins()
void	registerJoin(TableGroupJoin join)
void	registerRoot(TableGroup root)
void	render(SqlAppender sqlAppender)

Method Details

registerRoot

void registerRoot(TableGroup root)

registerJoin

void registerJoin(TableGroupJoin join)

containsOuterJoins

boolean containsOuterJoins()

render

void render(SqlAppender sqlAppender)