- Java code
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).log4j:WARN Please initialize the log4j system properly.Hibernate: insert into tbl_user (uname, upass) values (?, ?)Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not insert: [entity.User] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2176) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2656) at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:551) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:547) at dao.UserDaoTest.testSave(UserDaoTest.java:49) at dao.UserDaoTest.main(UserDaoTest.java:24)Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: 不能将值 NULL 插入列 'uid'，表 'neusoftbookdb.dbo.tbl_user'；列不允许有空值。INSERT 失败。 at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(Unknown Source) at com.microsoft.sqlserver.jdbc.IOBuffer.processPackets(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerStatement.sendExecute(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerStatement.doExecuteUpdate(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeUpdate(Unknown Source) at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57) ... 17 more
有高手能告诉我怎么回事吗？我刚刚学的框架照着视频上打的！但是确出现这个问题！查询更改和删除都行！就是插入数据不行
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给‘uid’赋值
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这不是很明显，你的uid字段不能为空
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insert into tbl_user (uname, upass) values (?, ?)
很显然，你的SQL语句中没有uid...
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你这里的uid是主键，你应该在xml文件中设置主键类型的时候设置错了，把你现在uid的主键类型发来看一下
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果断UID的问题嘛
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你的hibernate配置文件配置错了，主键类型如果是uuid的话，hibnernate自动生成uuid32位主键，如果是assined类型的话，需要你给主键值赋值。<generator class="uuid.hex"/>；<generator class="assigned"/>