Question

我是Hibernate的新手。现在从web开始研究这个例子。我有一个包含一些表的MySQL数据库，包括table＆＃34; profession＆＃34;。该表有两个cols：profession_id（自动增量）和profession_name。

在java项目中，我有一个＆＃39;测试＆＃39; class，包含几种表处理方法和＆＃39; main＆＃39;方法。处理方法是：

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();

}

＆＃39;主＆＃39;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，问题是：当我运行它时，我得到了

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)

在stackoverflow上阅读了关于这个主题的几个主题后，我了解到，这个问题不知何故与ids有关。所以我决定评论这段代码：

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

之后一切正常。

所以问题是：如果需要，如何避免此异常： 1.删除其中一行（＆＃39;当我删除例如result.get（3）等时也会出现此问题）。 2.删除剩余的行。

Answer 1

删除特定Profession后，也会从ArrayList中删除该内容。例如

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

这可以解决您的问题。

Java的。休眠。 org.hibernate.StaleStateException：批量更新从update [0]返回意外的行数;实际行数：0;预期：1

1 个答案: