Question

i have a stored procedure

UPDATE tblTime
SET TimeOut = DATEADD(HOUR,8,TimeIn)
WHERE tId =
( 
   SELECT MAX(tId)
   FROM tblTime
   WHERE UserId = 3571
)

although there’s no question really, in that case if it did succeed in this query

cause even if the field is empty or if it has value,
it will in this case succeed

but i do need it for future other queries… and also ,
in this case i want the C# code to report
not only that it was requesting query to be execute – meaning it did happen,

but to get an actual answer from sql server
as a return value that c# could use or turn into Boolean

Answer 1

i have managed to do somthing about this so i can specify a condition inside sql server stored proc

declare an OUTPUT variable(PARAMETER) then

set its value to say 1 if condition is met and -1 if not

then
in c# set a function as follows
in this example outpout parameter is named ERROR

   public static int UpdateTblViaStoredPRoc(string SPname, int UserID)
        {
            int message = 0;
            using (SqlConnection con = new SqlConnection("server=(local);Initial Catalog=****DBNAME HERE***;Integrated Security=True"))
            {

                con.Open();

                SqlCommand cmd = new SqlCommand(SPname, con);

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.AddWithValue("@Uid", UserID);

                cmd.Parameters.Add("@ERROR", SqlDbType.Int);

                cmd.Parameters["@ERROR"].Direction = ParameterDirection.Output;

                cmd.ExecuteNonQuery();

                 message =(int) cmd.Parameters["@ERROR"].Value;

                con.Close();
            }
            return message;
        }

stored proc is then allways following the same pattern

declare ERROR parameter, set a condition to output the ERROR accordingly :

ALTER PROCEDURE [dbo].[nameofProc]
@UId Int, @ERROR int OUT
AS

BEGIN    

SET NOCOUNT ON;

DECLARE @TimeOtVal varchar(50)
set @TimeOtVal = (SELECT CASE WHEN [TimeOut] IS NULL THEN '' ELSE CONVERT(NVARCHAR,[TimeOut]) END FROM tblTime WHERE tId = ( SELECT MAX(tId) FROM tblTime WHERE UserId = @UId))

IF (@TimeOtVal = '') -- condition for the update 

BEGIN -- now action is taken if condition is met

    SET NOCOUNT ON;
    UPDATE tblTime  SET TimeOut = DATEADD(HOUR,8,TimeIn) WHERE tId = ( SELECT MAX(tId) FROM tblTime WHERE UserId = @UId)        
         SET  @ERROR = 1
END
 else

     BEGIN -- Other wise , if condition isnot met 

         SET  @ERROR = -1

     END

END

so it does what you want only if you allowed it by the condition
then reports the action so you can handle it in program code behind .