NullExpression (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

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net.sf.hibernate.expression
Class NullExpression

java.lang.Object
  net.sf.hibernate.expression.AbstractCriterion
      net.sf.hibernate.expression.NullExpression

All Implemented Interfaces:: Criterion

public class NullExpression
extends AbstractCriterion

Constrains a property to be null

Author:: Gavin King

Method Summary

TypedValue[] getTypedValues(SessionFactoryImplementor sessionFactory, Class persistentClass, Map aliasClasses)
          Return typed values for all parameters in the rendered SQL fragment

String toSqlString(SessionFactoryImplementor sessionFactory, Class persistentClass, String alias, Map aliasClasses)
          Render the SQL fragment

String toString()
          For cosmetic purposes only!

Methods inherited from class net.sf.hibernate.expression.AbstractCriterion

getColumns, getType, getTypedValue

Methods inherited from class java.lang.Object

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

Method Detail

toSqlString

public String toSqlString(SessionFactoryImplementor sessionFactory,
                          Class persistentClass,
                          String alias,
                          Map aliasClasses)
                   throws HibernateException

Description copied from interface: Criterion

Render the SQL fragment

Parameters:: sessionFactory -; persistentClass -; alias -
Returns:: String
Throws:: HibernateException

getTypedValues

public TypedValue[] getTypedValues(SessionFactoryImplementor sessionFactory,
                                   Class persistentClass,
                                   Map aliasClasses)
                            throws HibernateException