Question

到目前为止，我有这个：

var query = (from g in this.Context.Groups
    where g.ID == groupID &&
          g.TaxId == groupTaxId
    select g.Group_K);

然后我要添加的SQL查询是：

select zipCode 
from ADDRESSES 
where ADDRESS_K in 
   (select ADDRESS_K 
    from GROUPADDRESS 
    where GROUP_K = "is in Group_K found above "
       and address_type = "address type variable I pass into this method"
       and ACTIVE = 1)

请注意，GROUPADDRESS是具有GROUPS和Addresses的{{1}}和Group_K表之间的桥接表我无法弄明白如何添加新的Address_K查询或更新我必须为我要添加的新LINQ帐户添加的查询。谢谢你的帮助。

SQL

Answer 1

也许是这样的：

var groupID=1;
var groupTaxId=1;
var result=
(
    from a in this.Context.ADDRESSES
    where
    (
        from ga in this.Context.GROUPADDRESS
        join g in this.Context.Groups
            on g.GROUP_K equals ga.GROUP_K
        where ga.ID == groupID
        where g.TaxId== groupTaxId
        where ga.ACTIVE == 1
        select ga.ADDRESS_K
    ).Contains(a.ADDRESS_K)
    select new
    {
        a.zipCode
    }
).ToList();

Answer 2

假设您的上下文中有一个GroupAddress：

var query = (from g in this.Context.Groups
join ga in this.Context.GroupAddress on g.AddressK equals ga.AddressK
where g.ID == groupID &&
      g.TaxId == groupTaxId
select g.Group_K);

编辑：

正确，因此GroupAddress位于Group和Address之间。假设您已在数据库中设置关系，您将拥有可以测试的导航属性：

where g.Address == ''

EF删除链接表，以便您的导航更简单。如果在EF中不可用，请在上面添加另一个连接。

var query = (from g in this.Context.Groups
join ga in this.Context.GroupAddress on g.Group_K equals ga.Group_K
join a in this.Context.GroupAddress on g.Address_K equals ga.Address_K
where g.ID == groupID &&
      g.TaxId == groupTaxId
select g.Group_K);

使用LINQ编写SQL查询

2 个答案: