【NHibernate】HQL入门

在NHibernate 中 HQL 可以帮我们转成最终依赖数据库的查询脚本；

语法也甚是强大，适配主流数据库， HQL不支持union，要想取多个表数据可以做两次单独查询。

 IQuery query =
                NHibernateHelper.OpenSession()
                    .CreateQuery(
                        @"select p from Product as p,Product as pp where p.Name=pp.Name");
                       
            IList result = query.List();
            IEnumerator enu = result.GetEnumerator();
            while (enu.MoveNext())
            {
                object[] obj = (object[])enu.Current;     
            }

HQL

select p from Product as p,Product as pp where p.Name=pp.Name

MSSQL

NHibernate: select product0_.Id as Id0_, product0_.Name as Name0_, product0_.Category as Category0_, product0_.Discontinued as Disconti4_0_ from Product product0_, Product product1_ where product0_.Name=product1_.Name