通过加入休眠（HQL）进行更新

问题描述

我想编写一个查询，更新一个属性，并且基于另一个表上的值。

这是我的例子，我有这两个表：Client和Widhdrawal。

客户端：idClient，名称...

提取：idWidh，成本和idClient（外键）

现在，如果我在（idClient = 5例如）条件下更新客户端，我不能。

我试过了，但徒劳无功：

 字符串hql =UPDATE Widhdrawal W set W.cost =：salary+ 
其中W.Client.id_client =：employee_id） ; 
 
查询查询= session.createQuery（hql）; 
 query.setParameter（salary，1000）; 
 query.setParameter（employee_id，5）; 
 int result = query.executeUpdate（）; 
  

我希望有人可以提供一些建议，谢谢。

字符串hql =UPDATE Widhdrawal W set W.cost =：salary +
其中，W.id_client =（从客户端选择id_client，其中id_client =：employee_id）;

提款和客户端是POJO类名称 p>

I'm on trouble with an hql problem.

I would like to write a query, that updates an attribut, and that's based on a value on another table.

This is my example, I have those two tables : Client and Widhdrawal.

Client : idClient, name ...

Widhdrawal : idWidh, cost, and the idClient (foreign key)

Now if i would update the client, under the condition of (idClient = 5 for example), i can't.

I tried this, but in vain :

        String hql = "UPDATE Widhdrawal W set W.cost = :salary "  +
    "where W.Client.id_client = :employee_id)";

    Query query = session.createQuery(hql);
    query.setParameter("salary", 1000);
    query.setParameter("employee_id", 5);
    int result = query.executeUpdate();

I hope that someone can have some advices, thank you.

解决方案

Try this way --

String hql = "UPDATE Widhdrawal W set W.cost = :salary " + "where W.id_client =(select id_client from client where id_client = :employee_id)";

Widhdrawal and client is POJO class name.

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