Java。休眠。 org.hibernate.StaleStateException：批量更新從update [0]返回意外的行數;實際行數：0;預期：1

Question

我是Hibernate的新手。 現在正在從web上的例子。 我有一個MySQL數據庫，其中包含一些表，包括表「專業」。此表有兩個列：profession_id（自動增量）和profession_name。

在java項目中我有一個'測試'類，它包含幾個表處理方法和'main'方法。 加工方法：

private void addProfession(String name) { 
    Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
    session.beginTransaction(); 
    Profession r = new Profession(); 
    r.setProfessionName(name); 
    session.save(r); 
    session.getTransaction().commit(); 
} 

private ArrayList<Profession> getProfessions() { 
    Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
    session.beginTransaction(); 
    ArrayList<Profession> result = (ArrayList<Profession>) session 
      .createQuery("from Profession order by professionName").list(); 
    session.getTransaction().commit(); 
    return result; 
} 

private void deleteProfessions(ArrayList<Profession> result) { 
    Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
    session.beginTransaction(); 
    for (Profession p : result) { 
     System.out.println("Delete: " + p.getProfessionId() + ": " + p.getProfessionName()); 
     session.delete(p); 
    } 
    session.getTransaction().commit(); 
} 

private void deleteEntity(Object object){ 
    Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
    session.beginTransaction(); 
    session.delete(object); 
    session.flush(); 

    session.getTransaction().commit(); 

} 

'主' 方法包含以下操作：

public static void main(String[] args) { 
    Test test = new Test(); 
    test.addProfession("Profession_1"); 
    test.addProfession("Profession_2"); 
    test.addProfession("Profession_3"); 
    test.addProfession("Profession_4"); 
    test.addProfession("Profession_5"); 

    ArrayList<Profession> result = test.getProfessions(); 

    test.deleteEntity(result.get(0)); 
    test.deleteProfessions(result); 
} 

所以，問題是：當我運行它，我得到

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$BasicExpectation.checkBatched(Expectations.java:67) 
at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:54) 
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:46) 
at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3197) 
at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3434) 
at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:98) 
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:560) 
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:434) 
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337) 
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) 
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1282) 
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:465) 
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:2963) 
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2339) 
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:485) 
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:147) 
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$100(JdbcResourceLocalTransactionCoordinatorImpl.java:38) 
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:231) 
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:65) 
at firstproject.Main.deleteProfessions(Main.java:33) 
at firstproject.Main.main(Main.java:57) 

閱讀幾個主題之後關於這個主題在stackoverflow我瞭解到，這個問題以某種方式與ID連接。所以我決定評論這段代碼：

test.deleteEntity(result.get(0)); 

之後，一切正常。

所以問題是： 我如何避免這種異常，如果我需要： 1.刪除其中一行（'因爲這個問題也會發生，當我刪除例如result.get（3）等等） 。 2.刪除剩餘的行。

Answer 1

刪除特定Profession後，還將其從ArrayList中刪除。例如

test.deleteEntity(result.get(0)); 
    result.remove(0); 

這應該可以解決您的問題。