hibernate问题求教!!

Question

以前插入一条是用这样的方法（指定ＩＤ指） CommunityarticleDao dao = new  CommunityarticleDaoimpl();
Communityarticle article = new Communityarticle();

article.setArticleid(new Integer(5));
article.setCreatetime("99");

dao.saveCommunityarticle(article);现在那个setArticleid方法里应该写什么呢？

Answer 1

如果设置了自增的话就不需要再调用setArticleid()方法了，hibernate会自动判断最大的ID然后＋1

Answer 2

楼上的朋友．．．如果我不写article.setArticleid(new Integer(5));这句．．报错

Answer 3

Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not get next sequence value
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:96)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:85)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:481)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
at com.bizengine.km.daoimpl.CommunityarticleDaoimpl.saveCommunityarticle(CommunityarticleDaoimpl.java:45)
at com.bizengine.km.test.Testarticle.main(Testarticle.java:30)
Caused by: java.sql.SQLException: ORA-02289: 序列（号）不存在 at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteDescribe(TTC7Protocol.java:830)
at oracle.jdbc.driver.OracleStatement.doExecuteQuery(OracleStatement.java:2391)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2672)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:589)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:527)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:75)
... 10 more

Answer 4

<id name="articleid" type="integer">
            <column name="ARTICLEID" precision="22" scale="0" />
            <generator class="sequence" />
============================================================
改为
<id name="articleid" type="integer">
            <column name="ARTICLEID" precision="22" scale="0" />
            <generator class="sequence" >
              <param name="sequence">你创建的序列</param>
　　　　　　</generator>