Spring数据jpa嵌套事务回滚不删除插入？

Question

我试图在一个事务中插入两个记录到我的数据库中。第二次插入失败，但是在回滚中第一次插入没有被删除：

   @Resource
      private WebMessageRep rep; //<-- extends JpaRepository

@Transactional
  public void test() {
    WebMessage wm = new WebMessage(.valid params.);
    wm = rep.save(wm);//<-- save is crud save which is transactional by default
    WebMessage wm2 = new WebMessage(.invalid params.);
    rep.save(wm2);
  }

（我还尝试将save方法替换为：jpaContext.getEntityManagerByManagedType（WebMessage.class）。坚持（wm）；因此，我不使用crud保存，但问题仍然存在）

我启用了事务日志以查看发生了什么，我发现：

在调用test（）之前，会创建一个新事务，因为@transactional Annotation：

Creating new transaction with name [com..data.webmessage.WebMessageServiceImpl.test]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
 Opened new EntityManager [SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=0} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])] for JPA transaction

调用first save，它会看到第一个事务：

Found thread-bound EntityManager [SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=0} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])] for JPA transaction

第二次保存也会看到第一个事务：

Found thread-bound EntityManager [SessionImpl(PersistenceContext[entityKeys=[EntityKey[com..shared.WebMessage#107]],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=1} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])] for JPA transaction
2017-02-22 14:07:22,000 [           main] DEBUG orm.jpa.JpaTransactionManager             - Participating in existing transaction

退出test（）时，提交完成：

 Committing JPA transaction on EntityManager [SessionImpl(PersistenceContext[entityKeys=[EntityKey[com..shared.WebMessage#108], EntityKey[com..shared.WebMessage#107]],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=2} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])]

它失败了：

    Column 'text' cannot be null
 HHH000010: On release of batch it still contained JDBC statements
HHH000346: Error during managed flush [org.hibernate.exception.ConstraintViolationException: could not execute statement]
    Initiating transaction rollback after commit exception

回滚：

Rolling back JPA transaction on EntityManager [SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=ExecutableList{size=0} updates=ExecutableList{size=0} deletions=ExecutableList{size=0} orphanRemovals=ExecutableList{size=0} collectionCreations=ExecutableList{size=0} collectionRemovals=ExecutableList{size=0} collectionUpdates=ExecutableList{size=0} collectionQueuedOps=ExecutableList{size=0} unresolvedInsertDependencies=null])]

奇怪的是第一个插入的记录还在我的数据库（mysql）中。

不确定它是否意味着什么，但在提交时我们有：插入=可执行列表{大小=2}，但在回滚时是：插入=可执行列表{大小=0}

有人知道为什么它不回滚第一次插入吗？

我的事务配置非常简单：

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="emf" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

启动我的调试器显示，当尝试回滚时，我的事务不再活跃。让我解释一下：

[JpaTransactionManager.java]

@Override
    protected void doRollback(DefaultTransactionStatus status) {
        JpaTransactionObject txObject = (JpaTransactionObject) status.getTransaction();
        if (status.isDebug()) {
            logger.debug("Rolling back JPA transaction on EntityManager [" +
                    txObject.getEntityManagerHolder().getEntityManager() + "]");
        }
        try {
            EntityTransaction tx = txObject.getEntityManagerHolder().getEntityManager().getTransaction();
            if (tx.isActive()) {
                tx.rollback();
            }
        }
        catch (PersistenceException ex) {
            throw new TransactionSystemException("Could not roll back JPA transaction", ex);
        }
        finally {
            if (!txObject.isNewEntityManagerHolder()) {
                // Clear all pending inserts/updates/deletes in the EntityManager.
                // Necessary for pre-bound EntityManagers, to avoid inconsistent state.
                txObject.getEntityManagerHolder().getEntityManager().clear();
            }
        }
    }

上面代码中的tx.isActive（）返回false，这意味着不执行回滚。

现在最大的问题是为什么我的交易不再活跃？

Answer 1

看起来问题出在mysql上，Spring data jpa生成的表属于myisam类型。

当使用某些类型的交易时，myisam似乎变得不稳定。

我将我的表转换为innodb，现在它可以工作了：当事务失败并回滚事务时，所有插入的行都会被删除。当表的类型为myisam时，不会发生这种情况。