使用Hibernate做个简单的测试插入数据不能成功解决思路

使用Hibernate做个简单的测试插入数据不能成功

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

[解决办法]
给‘uid’赋值
[解决办法]
这不是很明显，你的uid字段不能为空
[解决办法]
insert into tbl_user (uname, upass) values (?, ?)
很显然，你的SQL语句中没有uid...
[解决办法]
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
[解决办法]
果断UID的问题嘛
[解决办法]
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"/>

[解决办法]
你的uid应该是主键吧 不能为空。
[解决办法]
你把User类和对应的hbm发出来看看

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