spring - 在@Transactional 中的事务期间提交

Question

是否可以在标记为 Spring 的 的方法中执行提交？ @事务 ?

@PersistenceContext
private EntityManager em;

@Transactional(propagation = Propagation.REQUIRED)
public void saveMembersWithMultipleCommits(List<Member> members)
    throws HibernateException
{
    Iterator<Member> it = members.iterator();
    while (it.hasNext())
    {
        while (it.hasNext())
        {
            Member wsBean = it.next();
            em.persist(wsBean); // overall commit will be made after method exit
            log.info("Webservices record " + wsBean + " saved. " + i++);
        }
    }
}

我想在说每 500 个项目后提交给 DB。在上述背景下这可能吗？

Answer 1

不，您需要以编程方式使用，例如 TransactionTemplate API。阅读更多 here .

它看起来像

while (it.hasNext())
{
    transactionTemplate.execute(new TransactionCallbackWithoutResult() {
        protected void doInTransactionWithoutResult(TransactionStatus status) {
            int counter = 0;
            while (it.hasNext() && counter++ < 500) {
                Member wsBean = it.next();
                em.persist(wsBean);
                log.info("Webservices record " + wsBean + " saved. " + i++);
            }
        }
    );
}