如何在 Join 语句中而不是在 NHibernate QueryOver 中的 Where 块中指定多个条件答案

【问题标题】：How to specify multiple condition in Join statement rather than in Where block in NHibernate QueryOver如何在 Join 语句中而不是在 NHibernate QueryOver 中的 Where 块中指定多个条件
【发布时间】：2025-12-28 14:55:10
【问题描述】：

以下 QueryOver 在 Where 块中生成子查询，但我宁愿寻找在连接语句中指定该条件的方法

var productsWithLatestComments = _sessionHelper.GetSession().QueryOver(() => p)
                .Left.JoinAlias(() => p.Comments, () => cm)
                .WithSubquery.Where(() => cm.CommentDate == QueryOver.Of<Comment>()
                    .Where(c => c.Product.Id == p.Id)
                    .SelectList(list => list.SelectMax(c => c.CommentDate)).As<DateTime>())
                .Where(() => p.Status != "NOT SOLD" )
                .SelectList(list => list ....GET THE LIST OF COLS.........

这会产生类似

的东西

SELECT this_.id as y0_, ......... FROM product this_ 
left outer join comment cn1_ on this_.id=cn1_.product_id 
WHERE cn1_.comment_date = (SELECT max(this_0_.created_date) as y0_ FROM comment this_0_ WHERE this_0_.product_id = this_.id) and (not (this_.status = ?p0);?p0 = 'Sold Out'' [Type: String (18)]

但我一直在寻找

SELECT this_.id as y0_, ......... FROM product this_ 
left outer join comment cn1_ on this_.id=cn1_.product_id and cn1_.comment_date = (SELECT max(this_0_.created_date) as y0_ FROM comment this_0_ WHERE this_0_.product_id = this_.id)
WHERE (not (this_.status = ?p0);?p0 = 'Sold Out'' [Type: String (18)]

【问题讨论】：

标签： mysql asp.net-mvc-3 nhibernate queryover

【解决方案1】：

好的，我通过在连接别名内而不是在 .WithSubquery 内指定子查询，在 QueryOver 中进行了一些更改

var productsWithLatestComments = _sessionHelper.GetSession().QueryOver(() => p)
                .JoinAlias(() => p.Comments, () => cm, JoinType.LeftOuterJoin, Subqueries.Where(() => cm.CommentDate == QueryOver.Of<Comment>()
                    .Where(c => c.Product.Id == p.Id)
                    .SelectList(list => list.SelectMax(c => c.CommentDate)).As<DateTime>()))
                .Where(() => p.Status != "NOT SOLD" )
                .SelectList(list => list ....GET THE LIST OF COLS.........

【讨论】：