我在日志中得到了异常:
javax.persistence.TransactionRequiredException:执行更新/删除查询
这位于isNew = false
方法的updateSomething()
分支中。我没有发现其他分支机构的例外情况。
我在stackoverflow上发现了一些有关使用entityManager.joinTransaction();
的信息,但是当我这样做时,又遇到了另一个异常:
java.lang.IllegalStateException:不允许在共享的EntityManager上加入事务
我想正确处理此问题,以便updateSomething
方法起作用。我还想知道嵌套@Transactional注释是否是一个好主意,以及从事务方法调用事务方法的效果是什么-我相信内部事务在其自己的事务中运行并提交到数据库。>
注意:HACK不起作用,我将其保留为我尝试过的示例。
想法:每次更新(使用本机SQL的更新)之后执行entityManager.flush()
会有所帮助吗?
@Transactional
public boolean generateLogsComposite() {
Connection conn = getConnection();
writeSomeData(conn);//write some data using a separate connection
boolean isNew = checkSomeData();//The check works with the data from writeSomeData although not using he connection conn
if(isNew) {
generateEmail(conn);//Calls a stored procedure on connection conn.
updateRunEnvOnEmail(emailId, runEnv);
//Now the data from generateEmail and updateRunEnvOnEmail is present
} else {
updateSomething();//has a javax.persistence.TransactionRequiredException: Executing an update/delete query
}
}
private void joinTransaction() {
try {
//HACK vs javax.persistence.TransactionRequiredException: Executing an update/delete query
entityManager.joinTransaction();
logger.debug("Joined transaction successfully");
} catch(Throwable t) {
//java.lang.IllegalStateException: Not allowed to join transaction on shared EntityManager
}
}
@Transactional
public void updateRunEnvOnEmail(Long emailId, String runEnv)
{
try
{
//HACK vs javax.persistence.TransactionRequiredException: Executing an update/delete query
joinTransaction();
Query query = entityManager
.createNativeQuery("update XXX.EMAIL e set e.RUN_ENVIRONMENT = :runEnv where e.EMAIL_ID = :emailId");
query.setParameter("runEnv", runEnv);
query.setParameter("emailId", emailId);
query.executeUpdate();
} catch (Exception e)
{
logger.debug("Error while updating RUN_ENVIRONMENT on Email : "
+ emailId + " ::: " + e);
}
}
@Transactional
public void updateSomething()
{
try
{
//HACK vs javax.persistence.TransactionRequiredException: Executing an update/delete query
joinTransaction();
Query query = entityManager
.createNativeQuery("update something");
query.executeUpdate();
} catch (Exception e)
{
logger.debug("Error while updating something",e);
}
}
答案 0 :(得分:1)
通常,除非明确配置,否则JPA不希望在事务外部调用更新。正确的方法如下:
entityManager.getTransaction().begin();
// do your updates
entityManager.getTransaction().commit();
但是,如果您希望由Spring管理交易(您的IllegalStateException
如此建议),那么您可能希望研究@Transactional
(但是请确保提供正确的交易管理器,想查看TransactionRequiredException Executing an update/delete query的答案以获取见识。