爪哇。休眠。 org.hibernate.StaleStateException：批量更新从更新 [0] 返回了意外的行数；实际行数：0；预期：1

Question

我是 Hibernate 的新手。 现在正在处理来自网络的示例。 我有一个 MySQL 数据库，其中包含一些表，包括表“专业”。该表有两个列：professional_id(auto-increment) 和professional_name。

在 java 项目中，我有一个“测试”类，其中包含几种表处理方法和“主”方法。 处理方法有：

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();

}

'main' 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 上阅读了几个关于这个主题的主题后，我了解到这个问题在某种程度上与 ids 相关。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（'因为我删除例如result.get（3）等时也会出现此问题）。 2. 删除剩余行。

Answer 1

删除特定的Profession 后，还要将其从ArrayList 中删除。例如

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

这应该可以解决您的问题。