How do I pass a list as a parameter in a stored procedure?

Question

Looking to pass a list of User IDs to return a list names. I have a plan to handle the outputed names (with a COALESCE something or other) but trying to find the best way to

Answer 1

I solved this problem through the following:

1. In C # I built a String variable.

string userId="";

2. I put my list's item in this variable. I separated the ','.

for example: in C#

userId= "5,44,72,81,126";

and Send to SQL-Server

 SqlParameter param = cmd.Parameters.AddWithValue("@user_id_list",userId);

3. I Create Separated Function in SQL-server For Convert my Received List (that it's type is NVARCHAR(Max)) to Table.

CREATE FUNCTION dbo.SplitInts  
(  
   @List      VARCHAR(MAX),  
   @Delimiter VARCHAR(255)  
)  
RETURNS TABLE  
AS  
  RETURN ( SELECT Item = CONVERT(INT, Item) FROM  
      ( SELECT Item = x.i.value('(./text())[1]', 'varchar(max)')  
        FROM ( SELECT [XML] = CONVERT(XML, ''  
        + REPLACE(@List, @Delimiter, '') + '').query('.')  
          ) AS a CROSS APPLY [XML].nodes('i') AS x(i) ) AS y  
      WHERE Item IS NOT NULL  
  );

4. In the main Store Procedure, using the command below, I use the entry list.

SELECT user_id = Item FROM dbo.SplitInts(@user_id_list, ',');