在nHibernate的条件中编写子查询 [英] Write subquery in Criteria of nHibernate

问题描述

我已经了解了Criteria中的子查询，但是仍然无法正确理解它.在这里我以一个例子为例，如果有人可以帮助我使用子查询来编写它，那就太好了.

I've read about subquery in Criteria, but I am still unable to grasp it properly. Here I am taking one example and if somebody can help me write that using subquery it will be great.

让我们说我们有桌子

Employee{EmployeeId.(int),Name(string),Post(string),No_Of_years_working(int)}

现在，我希望所有经理人以及不到10年的工作人员.我知道无需使用子查询就可以得到结果，但是我想使用子查询只是为了了解其在条件中的工作方式.

Now I want all the employees who are Managers and working for less than 10 years. I know that we can get the result without using subqueries but I want to use subquery just to understand how it works in criteria.

因此，我该如何使用子查询编写条件来获取这些员工.

So, how I can write Criteria using subquery to get those employees.

推荐答案

嗯-代码应该是这样的:

Well - the code should be something like this:

DetachedCriteria dc = DetachedCriteria.For<Employee>()
.Add (Subqueries.PropertyIn("EmployeeId",
     DetachedCriteria.For<Employee>()
         .SetProjection(Projections.Property("EmployeeId"))
         .Add(Restrictions.Lt("No_Of_years_working", 10))
         .Add(Restrictions.Eq("Post", "Manager"))
);

希望这会有所帮助.

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