如何解决这个问题org.hibernate.NonUniqueResultException：query没有返回唯一的结果：4

Question

这是我在Dao的代码         results = [client.send(message) for client in clients] # client.send may return an error code for result in results: # process the results after all the messages were sent if result is not None: # no error means success print("client.send error:", result) # report failures, but keep going

在Hibernate中得到这样的结果     session = sessionFactory.openSession(); tx = session.beginTransaction(); Criteria criteria = session.createCriteria(Router.class); criteria.add(Restrictions.eq("router_id", router_id));
Router router = (Router) criteria.uniqueResult();
tx.commit(); session.close(); return router;

提前致谢

Answer 1

根据官方的hibernate doc，

  

当应用程序调用Query.uniqueResult（）并且查询返回多个结果时抛出。

在您的情况下，返回4个结果。确保您的查询仅返回一个结果。