Question

ModuleUserPermission是我的主表来查询从哪里获得特定用户的模块ID，在模块表中我得到菜单ID查询菜单表这里是模块表只包含端点菜单ID的问题，我想要所有它的父母也是如此

select * 
            from [ModuleUserPermission] mup 
             inner join Module ml on ml.Id = mup.Module_Id          
            --inner join Menu m on m.Id = ml.Menu_Id and m.IsActive = 1 
            where (NULLIF(@AspNetUsers_Id,'') IS NULL OR mup.AspNetUsers_Id = @AspNetUsers_Id)

解：这就是我所做的，我们能以正确的方式做到吗？

DECLARE @TblTemp TABLE(
    Id int,
    ParentId int,
    Name nvarchar(max),
    Url nvarchar(max) NULL,
    SortOrder int,
    IconClass nvarchar(max) NULL,
    IsActive bit
);



;With temp as   (  
            select distinct m.* 
                from [ModuleUserPermission] mup 
                inner join Module ml on ml.Id = mup.Module_Id           
                inner join Menu m on m.Id = ml.Menu_Id and m.IsActive = 1 
            where (NULLIF(@AspNetUsers_Id,'') IS NULL OR mup.AspNetUsers_Id = @AspNetUsers_Id)

        union all

        select  m.* 
            from Menu m      
            inner join temp r on r.ParentId = m.Id
        where m.IsActive = 1 
     )
     INSERT INTO @TblTemp  select * from temp

;With relation (Id, IconClass,SortOrder, ParentId, Name,Url,IsActive, [Level], [OrderSequence])  
    as  
    (  
        select  distinct   m.Id, m.IconClass,m.SortOrder, m.ParentId, m.Name,ISNULL(m.Url,'') Url,m.IsActive, 1, cast(m.Id as varchar(20))  
        from @TblTemp m where m.ParentId = 0  

         union all  

        select p.Id, p.IconClass,p.SortOrder, p.ParentId,p.Name,p.Url,p.IsActive, r.[Level]+1, cast(r.orderSequence + '_' + cast(p.Id as varchar) as varchar(20))  
        from @TblTemp p 
        inner join relation r on p.ParentId = r.Id  

     )
select * from relation order by OrderSequence

Answer 1

由于在ParentId列中描述了顶级菜单项与较低级别项之间的关系，因此您需要将Menu表与自身联系起来，如下所示：

select  coalesce(m2.Id, m1.Id), coalesce(m2.Name, m1.Name)
from    [ModuleUserPermission] mup 
join    Module ml on ml.Id = mup.Module_Id          
join    Menu m on m.Id = ml.Menu_Id and m.IsActive = 1
left join Menu m2 on m.Id = m2.ParentId and m2.IsActive = 1
where   (NULLIF(@AspNetUsers_Id,'') IS NULL OR mup.AspNetUsers_Id = @AspNetUsers_Id)

left join是因为顶级项目不会与任何其他项目加入，因此使用inner join您将丢失它们。这样您可以使用null s保留它们，因此保留coalesce s

应选择从终点Id到其所有父项的递归查询

1 个答案: