Changing Query Component's criteria items at runtime

Question

Hi All,
As per my requirement i am changing query component's criteria items on some user input.
So initially there were 9 components on query panel form and after user input it will become 7. I programatically used to set this two component's UI Hint as setVisible(false).
Its working fine but if user input some value in to be removed 2 components it throws an null pointer exception.
I understood the problem which is:-
On query form if user input any value it used to persist. for same framework used to store this user entered value somewhere and after refresh it apply this value to the relevant components.
Since two of the component are missing after refresh. it throws a null pointer exception as it tried to call setValue() method on removed component which is not there.
After refresh the query panel form is rendered as per defined by QueryDescriptor object.
Is there any way we can update this QueryDescriptor object with the changes...????

Answer 1

Hi Simran,
Yes, it is possible with the help of store procedure. In SQL Server there is a IF-Else Conditional block, which you can use inside store procedure. Create a SP with 2 additional parameter something like FlagReadAgain and KeyField. Pass the flag always as True or False. For the Key field pass the record key which you want to read again if you are passing the Flag as True else pass it as 0 or whatever.
In the procedure check if the value of flag is True -> If yes, Read the entry with key name specified in where part.
In the else part put the query which you are using for the normal flow.
IF (FlagReadAgain) = TRUE
BEGIN
   SELECT EmpName, EmpAddress
   FROM Employee
   WHERE EmpID = 'E001'
END
ELSE
   BEGIN
     SELECT EmpName, EmpAddress
     FROM Employee
     WHERE Status = 'N'
   END
You may also use the approach which Srini mentioned. Create an application to restore any value to intial stage so that it can be picked up by XI when it poll again.
Choose any approach which you like.
Regards,
Jitender Chauhan