I'm writing an intranet app in PHP, and having issues around constraints.
Specifically, the error messages coming back from PG aren't very user
friendly. I'm looking for a way to make this a bit more smooth to the end
user, and ensure that my conditional checks really do match the requirements
set forth in the database.
For example, given a check constraint called "check_productcode" is it
possible to test a value against that constraint alone, without attempting to
insert anything?
Something like
"select check constraint check_productcode('testvalue')"
where "testvalue" is the string you wish to check against constraint called
"check_productcode". It might return an error message or not.
Can this be done? How? I can't find this in the docs anywhere...
Right now, I have lots of code like this:
<?
Function CheckInvoice($invoice)
{
$productcodes=array('E1', 'E2', 'E3', 'F11');
if (!in_array($productcodes($invoice['productcode'], $productcodes))
return "Error: Product code is not valid!";
...
}
This is a tedious, duplicative, and error-prone way just to get some
plain-english error messages, since anytime a constraint needs to be changed,
it requires a code audit. Ugh.
Is there a better way?
-Ben
--
"I kept looking around for somebody to solve the problem.
Then I realized I am somebody"
-Anonymous
