Why item level validation can only execute function but not procedure?

Question

Dear all,
When execute my form, some parameter values will be passed to the text items.
Those values are the procedure name or function name for that particular item which are already defined in a package and those items are non-database items.
Suppose a particular item can be validated by a procedure or function. It depends on what value is passed into the program.
If the item when-item-validation is triggered, that corresponding procedure or function will be executed by calling the following codes A) or B):
A) EXECUTE IMMEDIATE 'BEGIN' || procedure || '(:1);END;' USING v_value;
OR B) DBMS_SQL.EXECUTE(...)
Basically, the form is working fine except 2 blocks which can only accept Function, i.e. only fired the function but cannot fire the procedure. Actually these 2 blocks are similar to the others blocks and they are also non-database blocks.
I am using Form10g.
Anyone have idea for that? Thanks for advance.
Regards.

Answer 1

You cannot use Execute Immediate in Forms. You have to do that on the server in a stored procedure.
You should not use DBMS_SQL either. In Forms, you use EXEC_SQL, which is almost the same, except for the error handling. And it is VERY slow, since you make a number of calls to it, plus one for each variable passed.
Now... if you call a function, it must return a value. If you write code to dynamically call a function, this process must be complex enough to handle the returned value. The same occurs if your procedure that you call has any parameters. If there are no parameters, then it would be simpler.
If you want dynamic function or procedure processing, then I would suggest you just pass the value being validated plus the table.column name to a server-side stored procedure or package, and do all the processing on the server.
Good luck... it won't be easy.