Question

getting really close to running my first stored procedure. This one compiles but when I run it with
call test.fttest5('YEAR'); it throws an error

SQL State: 22001
Vendor Code: -303
Message: [SQL0303] Host variable *N not compatible. Cause . . . . . : A FETCH, SELECT, CALL, SET, VALUES INTO, GET DIAGNOSTICS, GET DESCRIPTOR, or SET DESCRIPTOR cannot be performed because the data type of host variable *N is not compatible with the data type of the corresponding list item.

Also how do I specify an unlimited data type in my stored procedure ? I tried DECLARE temp VARCHAR(MAX); but it did not worked. My platform is ISeries DB2 V5R4.

create procedure test.fttest5
    (IN ftExpression CHARACTER(30))
    language sql
    reads sql data
    dynamic result sets 1
    begin

    declare cmd VARCHAR(50);
    declare whr VARCHAR(50)
;

    declare x cursor for sl;
    set cmd='select * from testSchema.tempTable' ;
    if ftExpression IS NOT NULL
 THEN
     set whr= ftExpression;
    END IF;

    set cmd=cmd || CASE WHEN whr IS NULL THEN '' ELSE ' ORDER BY ' || whr END;  
    prepare sl from cmd;
    open x;
    return;
    end
    ;

Answer 1

I believe the error you are getting here is actually occurring before your procedure is even being invoked. You’ve got the procedure defined with a parameter that’s a CHAR but you are calling it with a VARCHAR. When you type SQL in interactively like that parameters come through as a VARCHAR.

Try calling it like this: call test.fttest5(CHAR('YEAR'))

Or you could change the parameter to be a VARCHAR too, though you would still want to test calling it with a CHAR to see what would happen.

However I think you are missing the SET RESULT SETS CURSOR x line. Also I’d put the prepare before the declare since I think the order might be important.

The IBM documentation is at http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/topic/rzaik/rzaikspresultsets.htm.