測試保存時，報錯a different object with the same identifier value was already associated with the session
然后我自己百度，有人說用merge()方法就可以解決，然而我使用之后又有心得錯誤。
INFO: HHH000232: Schema update complete
Hibernate:?
? ? select
? ? ? ? max(GID)?
? ? from
? ? ? ? gread
Hibernate:?
? ? select
? ? ? ? students0_.STUID as STUID1_0_0_,
? ? ? ? students0_.STUNAME as STUNAME2_0_0_,
? ? ? ? students0_.STUADDR as STUADDR3_0_0_,
? ? ? ? students0_.STUPHONE as STUPHONE4_0_0_?
? ? from
? ? ? ? STUDENTS students0_?
? ? where
? ? ? ? students0_.STUID=?
Hibernate:?
? ? insert?
? ? into
? ? ? ? gread
? ? ? ? (GNAME, GDESC, GID)?
? ? values
? ? ? ? (?, ?, ?)
Hibernate:?
? ? insert?
? ? into
? ? ? ? STUDENTS
? ? ? ? (STUNAME, STUADDR, STUPHONE, STUID)?
? ? values
? ? ? ? (?, ?, ?, ?)
Hibernate:?
? ? update
? ? ? ? STUDENTS?
? ? set
? ? ? ? STUNAME=?,
? ? ? ? STUADDR=?,
? ? ? ? STUPHONE=??
? ? where
? ? ? ? STUID=?
Exception in thread "main" org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:81)
at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:73)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:59)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3224)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3126)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3456)
at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:140)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:369)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:287)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:339)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1234)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at com.py4g.test.Test.add(Test.java:33)
at com.py4g.test.Test.main(Test.java:12)
2017-02-08
你看看是不是沒在hbm.xml文件那里把主鍵設置成自動增長型
2016-10-19
你先cfg.xml那里看看<property name="hbm2ddl.auto">update</property>這句，可能是update和create沒用清的鍋，可以重新來先create吧數據加進去然后改成update來測試，或者一直用create，可能是這里出了問題