hibernate中session.delete(sql),3.1与2.0的区别,导致的错误

今天使用session.delete(sql);报下面的错误:

org.hibernate.MappingException: Unknown entity: java.lang.String
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:569)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1086)
at org.hibernate.event.def.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:63)
at org.hibernate.impl.SessionImpl.delete(SessionImpl.java:579)

查查终于知道原因:

session.delete(sql)是2.0的接口,3.1中已经废弃,同时废弃的有:
find()、iterate()、filter()和delete(String hqlSelectQuery),saveOrUpdateCopy()

如果要使用的话,可以采用以下方式创建Session实例：

org.hibernate.classic.Session session=sessionFactory.openSession();

org.hibernate.classic.Session保留了2.0的接口

下面是3.1的reference里面这样写的,我使用了,但是还是报错,郁闷:

1) Hibernate3.0执行批量删除的程序代码：
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
String hqlDelete = "delete Customer where name = :oldName";
int deletedEntities = s.createQuery( hqlDelete )
.setString( "oldName", oldName )
.executeUpdate();
tx.commit();
session.close();

2)Hibernate3.0执行批量更新的程序代码：
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
String hqlUpdate = "update Customer set name = :newName where name = :oldName";
int updatedEntities = s.createQuery( hqlUpdate )
.setString( "newName", newName )
.setString( "oldName", oldName )
.executeUpdate();
tx.commit();
session.close();

我按照上面的写法,运行后报错如下:

org.hibernate.QueryException: query must begin with SELECT or FROM: delete [delete Resource r where r.nodeId=:nodeId and r.devId is not null ]
at org.hibernate.hql.classic.ClauseParser.token(ClauseParser.java:83)
at org.hibernate.hql.classic.PreprocessingParser.token(PreprocessingParser.java:108)
at org.hibernate.hql.classic.ParserHelper.parse(ParserHelper.java:28)
at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:176)
at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:152)
at org.hibernate.impl.SessionFactoryImpl.getQuery(SessionFactoryImpl.java:427)
at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:884)
at org.hibernate.impl.SessionImpl.executeUpdate(SessionImpl.java:865)
at org.hibernate.impl.QueryImpl.executeUpdate(QueryImpl.java:89)