Re: Select Statement
Date: Wed, 21 May 2008 15:18:02 +0000 (UTC)
amerar_at_iwc.net <amerar_at_iwc.net> wrote:
> Well, I appreciate everyone's advice. but, that is the way the
> application is designed. And, changing over 4000 PHP scripts is not
> an option right now. Eventually things will be re-written, but not
> A user function is the way to go. But, the number of parameters
> passed is not known. The formula can be simple, A + B, that is 2
> parameters, or A + B - C, that is 3 parameters, A + B - C / D * F that
> is 5 parameters......
> So, I have to write some function that accepts a variable number of
> parameters, for both the value and the operator. And, this has to be
> done from an SQL statement.
Create a type, like so:
create type number_array is table of number;
Then create a function to check the numbers:
create function foo(numbers number_array) return number_array...
The function iterates through the set of numbers and replaces the ones that are -99999 with 0, unless they are all -99999.
You can call this function from SQL. Of course you will need to figure out how to get the values from the returned array and use them in the formula - but there's no way around that. The approach I would try is passing the formula to the same or a different function as a string with bind variables, and getting the values in it that way.
Note that you need to define what happens if D in your last example there is -99999 - substituting 0 will not work. If you need to substitute 1 instead that will complicate matters.
-- _______________________________________________________________________ Dan Blum tool_at_panix.com "I wouldn't have believed it myself if I hadn't just made it up."Received on Wed May 21 2008 - 10:18:02 CDT