条件语句中的while和if条件t-sql

Question

I am trying to implement a while loop and if condition (with a function call) in a case statement. Basically, I am trying to do this:

begin
    case
       when (condition1 and condition 2 and ncolumn_num between 6 and 9) 
          then
             while @i < 10
             begin
                 if(hsip.Is_numeric( hsip.getTempResponseById(@cregion, @cState_code, @nFY, @nReport_id, @nsection_id, @nquestion_number, @ndisplay_number, @nquestion_number, @nquestion_part_number, @suser_id, @nrow_number, i, @suser_id)))

@nrunningtotal = @nrunningtotal + hsip.getTempResponseById(@cRegion, @cState_code, @nFY, @nReport_id, @nsection_id, @nquestion_number, @ndisplay_number, @nquestion_number,
    @nquestion_part_number, @suser_id, @nrow_number, @ncolumn_number, @suser_id)

        end if
end

Can I implement while loop and if condition within case statement. My business logic requires me to total the columns from 6 to 9 and have final total in col:10.

I have 2 functions: gettempresponsebyid : which returns response string and isnumeric function which converts to number.

Can someone please suggest a better way of doing this. I get this error:

INCORRECT SYNTAX NEAR IF AND INCORRECT SYNTAX NEAR RUNNINGTOTAL.

Answer 1

Q: Can I implement while loop and if condition within case statement.

A: No. CASE is not a T-SQL statement . It's an expression .

https://msdn.microsoft.com/en-us/library/ms181765.aspx

In the posted code, one big syntax problem starts right here:

BEGIN CASE ...
      ^

Use the IF / ELSE statement to conditionally control flow in T-SQL.

https://msdn.microsoft.com/en-us/library/ms182717.aspx

For a start, replace the invalid usage of the CASE expression with an IF statement.

BEGIN
  IF (condition1 AND condition2 AND ncolumn_num between 6 and 9)
    BEGIN
      ...
    END;
  END IF;
END;

But even with that change, it's still not clear what you are attempting to achieve or what problem you are trying to solve. There is likely a much better way to do what you are trying to do, but we'd just be throwing out guesses at what you are trying to do.