如何使用NHibernate QueryOver API获取行数? [英] How do I get row count using the NHibernate QueryOver api?

问题描述

我正在使用NHibernate 3.x的QueryOver API.我想获取行计数，但是我正在使用的方法返回所有对象，然后获取集合的计数.有没有办法只返回行数的整数/长值?

I'm using the QueryOver api that is part of NHibernate 3.x. I would like to get a row count, but the method I'm using returns all objects and then gets the count of the collection. Is there a way to just return an integer/long value of the number of rows?

我当前正在使用:

_session.QueryOver<MyObject>().Future().Count()

推荐答案

在使用了api之后，可以做到这一点:

After a bit of playing around with the api, this will do it:

_session.QueryOver<MyObject>()
    .Select(Projections.RowCount())
    .FutureValue<int>()
    .Value

如果您不想将来将其退还，则只需获取SingleOrDefault<int>().

If you don't want to return it as a future, you can just get the SingleOrDefault<int>() instead.

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