Dapper-dot-net "no column name"

dapper

Question

I have a result set that might look like this:

ID    (no column name)  anotherID
----  ----------------  ----------
1        super            3
1        super            4
3        duper            6
4        really           7
4        really           8

I have 2 issues:

First: How do I use dapper with a column with no name?

Second: I want to have a parent child relationship such that I get 3 objects each with a list of anotherID's for example:

public class MyObject
{
   public int ID
   public string Name
   public int[] Children
}

Accepted Answer

Well, un-named columns are not supported by dapper. I never really saw a reason for them.

I guess we could build support for:

class Foo { [ColumnNumber(1)] public string Name {get;set;} }

The trouble is that it introduces a very fragile method of querying which I strongly dislike, passing a directive to Query is just as clunky.

However, if you are happy to change the way you grab the results you could work around this.

var grid = QueryMultiple(@"set nocount on 
declare @t table(Id int, Name nvarchar(max), AnotherId int)

insert @t
exec proc

set nocount off 
select Id, Name from @t
select Id, AnotherId from @t
");

Then use the technique here to multi map: Multi-Mapper to create object hierarchy




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