如何在hibernate中为count（*）编写查询

问题描述

我想在 Hibernate 中执行下面的查询？

假设您的登录表由 LoginClass 类，使用 emailid 和 password 实例变量。然后执行如下所示的操作：

  Query query = session.createQuery（
select count（*）from LoginClass login where login.emailid =：email and login.password =：password）; 
 query.setString（email，something）; 
 query.setString（password，password）; 
 Long count =（Long）query.uniqueResult（）; 
  

它应该返回 count 正在寻找。您只需将名称改为您的班级和参数名称即可。

I want to execute the below query in Hibernate?

select count(*) from login where emailid='something' and password='something'

解决方案

Suppose your login table is mapped by a LoginClass class, with emailid and password instance variables. Then you'll execute something like:

Query query = session.createQuery(
        "select count(*) from LoginClass login where login.emailid=:email and login.password=:password");
query.setString("email", "something");
query.setString("password", "password");
Long count = (Long)query.uniqueResult();

It should return in count the result you're looking for. You just have to adapt the name to your class and your parameter names.

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