Question

我需要使用带有QueryOver的nhibernate从DB表中获取结果以进行下面的sql查询。 SQL请求是这样的：

SELECT Id, Name, Address,phone,ispassed  
FROM employee WHERE ispassed = 1   
ORDER BY   
(CASE WHEN id in (select empId from salary where empId in (2,45,65) and   Type=5) THEN 0 ELSE 1 END) asc,  
Name desc

我陷入了秩序中。那么，请举例说明构建

的nhibernate查询

ORDER BY  
(CASE WHEN id in (select empId from salary where empId in (2,45,65)  
and Type=5) THEN 0 ELSE 1 END) asc

我有子查询：

var subquery = QueryOver.Of<salary>()
            .Where(x => x.Type == 5 && x.empId.IsIn(2,65,45))
            .SelectList(list => list
.Select(Projections.Distinct(Projections.Property<salary>(x => x.empId))));

当我在主查询中添加子查询时：

query.OrderBy(Projections.Conditional(
            Restrictions.In(Projections.SubQuery(subquery)),
            Projections.Constant(0),
            Projections.Constant(1))).Asc();

它显示错误＆＃34;最佳重载方法匹配＆＃39; NHibernate.Criterion.Projections.SubQuery（NHibernate.Criterion.DetachedCriteria）＆＃39;有一些无效的论点。＆＃34;

Answer 1

我希望你想要的是：

        Employee employeeAlias = null;
        var subquery = QueryOver.Of<salary>()
            .Where(x => x.Type == 5 && x.empId.IsIn(2,65,45))
            .And(x => x.empId == employeeAlias.Id) 
            .Select(x => x.empId);

        var query = session.QueryOver(() => alias)
                   .Where(x => x.IsPassed)
                   .OrderBy(Projections.Conditional(
                       Subqueries.Exists(subquery.DetachedCriteria),
                       Projections.Constant(0),
                       Projections.Constant(1))
                       ).Asc
                   .ThenBy(x => x.Name).Desc
                   //.Select
                   //.List 
                   ;

如何在nhibernate中使用case来按顺序使用子查询？

1 个答案: