Calling SQL stored procedure dynamically

Question

Hallo,
could anybody tell me how to call HANA SQL stored procedure dynamically?
The coding looks like this:
v_ProcedureName := '"' || KpiNamespace || '::' || KpiName || '"';
v_SQL := 'CALL ' || :v_ProcedureName || '( lt_outKPI )';
EXEC :v_SQL;
For this call I get the error message:
"Transaction rolled back by an internal error: wrong number or types of parameters in call: Physical table is not allowed in OUT table variable position: LT_OUTKPI: line 1 col 55 (at pos 54)"
The procedure to be called dynamically has a table output parameter.
Thanks in advance,
Best Regards,
Alexey Romanov.
Hi Alex,
Can you share your requirement on exactly what is the need to call the procedure dynamically?
For your question, have a look on the below:
1) Have a procedure named EMPLOYEE_DETAILS
http://scn.sap.com/servlet/JiveServlet/downloadImage/2-14895702-415799/236-170/pastedImage_0.png
2) Created one more procedure named Dynamically as shown below:
CREATE PROCEDURE Dynamically ()
AS
BEGIN
DECLARE QUERY VARCHAR(1000);
QUERY := 'call  EMPLOYEE_DETIALS(?)';
EXECUTE IMMEDIATE (:QUERY);
END;
3) Output:
http://scn.sap.com/servlet/JiveServlet/downloadImage/2-14895702-415800/210-189/pastedImage_3.png
Regards,
Krishna Tangudu
Hi Krishna,
Thanks for your reply!
Unfortunately, I can neither go to ‘full discussion’, nor open the pictures, you have attached, nor see you reply.
That’s why I just add my reply to the problem description.
The procedure name is composed out of 2 parts on-the-fly, that is why I have to call it dynamically:
create local temporary table "#KPIEvals"(           
          "KpiNamespace" NVARCHAR(256) CS_STRING,           
          "KpiName" NVARCHAR(32) CS_STRING,               
          "KpiText" NVARCHAR(256) CS_STRING,           
          "Responsible" NVARCHAR(256) CS_STRING );
FOR cur_row as c_cursor DO        
     v_SQL := '';     
     v_ProcedureName :=  '"' || cur_row."KpiNamespace" || '::' || cur_row."KpiName" || '"';     
     v_SQL := 'CALL ' || :v_ProcedureName || '( lt_outKPI )';     
     EXEC :v_SQL;                
     v_SQL := 'INSERT INTO "#KPIEvals" SELECT * FROM :lt_out_kpi';     
     EXEC :v_SQL;                
END FOR;
I guess there might be 2 reasons for the problem:
1.     All the procedures are called dynamically in a loop.
2.     All the procedures have an output parameter, which is a table.
Hope that helps,
Best Regards,
Alex.

Answer 1

Hi Alexey, I think what you may need to do in this case is to do the insert into your temp table from within the dynamically called procedure, therefore no need for output param in your procedure call. You can then select from the temp table in your main procedure. Hope that makes sense.
Peter