我可以在NHibernate QueryOver中使用SQL函数吗? [英] Can I use SQL functions in NHibernate QueryOver?

问题描述

我一直在搜索Internet，找不到有关如何使用nhibernate 3.0的queryover的示例 例如，我想在queryover的where子句上使用字符串函数 例如:

I have been searching the internet and can't find an example on how to use the queryover of nhibernate 3.0 For example I would like to use the string functions on the where clause of the queryover ex:

var item = Query.Where(x => x.Name.ToLower() == name.ToLower()).FirstOrDefault();

但这是行不通的，因为nhibernate无法理解ToLower，那么如何以可能的方式扩展方言呢?

But this doesn't work, because nhibernate can't understand the ToLower, so how can extend the dialect in a way that this becomes possible?

推荐答案

session.QueryOver<Foo>()
    .Where(Restrictions.Eq(
        Projections.SqlFunction("lower", NHibernateUtil.String, 
            Projections.Property<Foo>(x => x.Name)),
        name.ToLower()))

应该让您像where lower(Name) = @p0

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