如何使用NHibernate的ICriteria进行分组,获取关联和T-SQL函数

Question

我想创建以下T-SQL语句:

SELECT  SUM (sa.Amount) as 'SumAmount',
        SUM(sa.Cost) as 'SumCost', 
        gg.[Description] as 'Goodsgroup', Month(sa.[Date]) as 'Month' 
FROM SalesmanArticle sa
INNER JOIN Article a
    ON a.ArticleId = sa.ArticleId
INNER JOIN GoodsGroup gg
    ON gg.GoodsGroupId = a.GoodsGroupId
GROUP BY gg.[Description], Month(sa.[Date])
ORDER BY 'Month', 'Goodsgroup'

这可能与NHibernates ICriteria有关吗？

我如何使用Month-T-SQL函数？

我必须手动加入或不的的ICriteria API知道,当我使用propetyName"SalesmanArticle.Article.Goodsgroup.Description"它加入了第二条和Goodsgroup？

编辑:

现在我在这里写了这段代码:

// typesafe properties
string article = typeof(Article).Name;
string goodsGroup = typeof(GoodsGroup).Name;
string salesmanArticle = typeof(SalesmanArticle).Name;

string amount = Reflector.GetPropertyName<SalesmanArticle>(x => x.Amount);
string cost = Reflector.GetPropertyName<SalesmanArticle>(x => x.Cost);
string description = string.Format("{0}.{1}",
    goodsGroup, Reflector.GetPropertyName<SalesmanArticle>(x => x.Article.GoodsGroup.Description));
string date = Reflector.GetPropertyName<SalesmanArticle>(x => x.Date);

string formatedDate = string.Format("MONTH([{0}])", date);

return GetSession()
    // FROM
    .CreateCriteria(typeof(SalesmanArticle), salesmanArticle)
    // JOIN
        .CreateCriteria(article, article, JoinType.InnerJoin)
        .CreateCriteria(goodsGroup, goodsGroup, JoinType.InnerJoin)
    // SELECT
        .SetProjection(Projections.ProjectionList()
                           .Add(Projections.Sum(amount))
                           .Add(Projections.Sum(cost))
    // GROUP BY
                           .Add(Projections.GroupProperty(description))
                           .Add(Projections.SqlGroupProjection(formatedDate, formatedDate, new[]{"MyDate"} , new[] { NHibernateUtil.Int32 })))
        .List();

但是抛出了AdoException:

无法执行查询[SELECT sum(this_.Amount)as y0_,sum(this_.Cost)as y1_,goodsgroup2_.Description as y2_,MONTH([Date])FROM [SalesmanArticle] this_ inner join [Article] article1_ on this_. ArticleId = article1_.ArticleId inner join [GoodsGroup] goodsgroup2_ on article1_.GoodsGroupId = goodsgroup2_.GoodsGroupId GROUP BY goodsgroup2_.Description,MONTH([Date])]

[SQL:SELECT sum(this_.Amount)as y0_,sum(this_.Cost)as y1_,goodsgroup2_.Description as y2_,MONTH([Date])FROM [SalesmanArticle] this_ inner join [Article] article1_ on this_.ArticleId = article1_.ArticleId内联接[GoodsGroup] goodsgroup2_ on article1_.GoodsGroupId = goodsgroup2_.GoodsGroupId GROUP BY goodsgroup2_.Description,MONTH([Date])]

奇怪的是,NHibernate试图创建2个查询？!

他们两个都是正确的!

而不是代码行

.Add(Projections.SqlGroupProjection(formatedDate, formatedDate, new[]{"MyDate"} , new[] { NHibernateUtil.Int32 })))

我用了

.Add(Projections.SqlFunction("MONTH", NHibernateUtil.Int32, Projections.GroupProperty(date))))

SqlFunction的问题是它创建了一个GROUP BY sa.Date而不是MONTH(sa.Date).但这种方法在语法上是正确的.

所以我切换到了SqlGroupProjection方法.

但无论如何它不起作用.

有谁能够帮我？

Answer 1

我解决了 这是正确的代码:

public class SalesmanArticleRepository : Repository<SalesmanArticle>, ISalesmanArticleRepository
{
    public IList GetAllAll()
    {
        // typesafe properties
        string article = typeof(Article).Name;
        string goodsGroup = typeof(GoodsGroup).Name;
        string salesmanArticle = typeof(SalesmanArticle).Name;

        string amount = Reflector.GetPropertyName<SalesmanArticle>(x => x.Amount);
        string cost = Reflector.GetPropertyName<SalesmanArticle>(x => x.Cost);
        string description = string.Format("{0}.{1}",
            goodsGroup, Reflector.GetPropertyName<SalesmanArticle>(x => x.Article.GoodsGroup.Description));
        string date = Reflector.GetPropertyName<SalesmanArticle>(x => x.Date);

        string formatedDateSql = string.Format("month({{alias}}.[{0}]) as mydate", date);
        string formatedDateGroupBy = string.Format("month({{alias}}.[{0}])", date);

        return GetSession()
            // FROM
            .CreateCriteria(typeof(SalesmanArticle), salesmanArticle)
            // JOIN
                .CreateCriteria(article, article, JoinType.InnerJoin)
                .CreateCriteria(goodsGroup, goodsGroup, JoinType.InnerJoin)
            // SELECT
                .SetProjection(Projections.ProjectionList()
                                   .Add(Projections.Sum(amount))
                                   .Add(Projections.Sum(cost))
            // GROUP BY
                                   .Add(Projections.GroupProperty(description))
                                   .Add(Projections.SqlGroupProjection(formatedDateSql, formatedDateGroupBy, new[] { "mydate" }, new[] { NHibernateUtil.Int32 })))
                .List();
    }
}