Problem calling a form from another form in oracle 10g

Question

hi,
i have created A basic STUDENT form with all fields and the STUDENT/COURSES master/detail form .
I am trying to place to button on the STUDENT form that when pressed, will call the STUDENT/COURSES form and automatically query the COURSES for the employee being viewed on the STUDENT form.
here is the code i used
DECLARE
     pl_id ParamList;
BEGIN
     pl_id := Get_Parameter_List('tmpdata');
IF NOT Id_Null(pl_id) then
          Destroy_Parameter_list (pl_id);
     end if;
     pl_id := create_parameter_list ('tmpdata');
     add_parameter (pl_id, 'students_id',text_parameter, :s_id);
     run_product (forms, 'C:resubmission\stucourse.fmb', synchronous, runtime,
     filesystem, pl_id, null);
end;
although it successfully compiled,
when i press the button on the form it is giving me
frm-92101 : there was a failure in the forms sever during start up...
i have tried everything i can think off, am fairly new to this
please any assistance will be appreciated. am using oracle 10g
thanks in advance.

Answer 1

Ammad is right, in order to pass a parameter to another Form, the Form you call must have a corresponding parameter. In other words, if you go to the Parameters node of the Object Navigator you need to add a parameter called "STUDENTID" and set the data type and precision of the parameter to match the data you will pass to this parameter.
Once you have this parameter in your called form, you will have to write code in the called form to use the value of the parameter. This code is typically in the When-New-Form-Instance (WNFI) trigger, but that all depends on your requirements. In your example, this seems the appropriate trigger as your intent is to pass the Student ID and query any Courses the Student is enrolled in. Your WNFI trigger needs to check if there is a value in the Student_ID parameter and then set the default where clause of your COURSES datablock and execute a query on the block. For example:
/* Sample WNFI trigger */
/* This example "ASSUMES" your courses block is called COURSES */
BEGIN
   IF ( :parameter.STUDENT_ID IS NOT NULL ) THEN
      Set_Block_Property('COURSES', OneTime_W.here, 'STUDENT_ID = :Parameter.Student_ID');
      Execute_Query;
   END IF;
END;
Note: I had to put a period into the "OneTimeW.here" statement in order to get the Editor to accept my post.  Please remove the period if you use this sample code.
Hope this helps,
Craig B-)
If a response is helpful or correct, please mark it accordingly.
Edited by: CraigB on May 24, 2010 8:23 AM
Edited by: CraigB on May 24, 2010 8:23 AM
Edited by: CraigB on May 24, 2010 8:26 AM