根据MySQL字段验证PHP数据类型？

Question

Long time since I've been on but I've hit kind of a head scratcher of a question and I was wondering if anyone could suggest a solution.

The Scenario:

I have number of HTML forms feeding back data via AJAX to a set of PHP PDO query functions. Although the input will be validated on the form before it is sent I don't want to rely solely on this.

What I'm asking:

What I'm after is some means of checking that the type of the PHP parameter passed is compatible with the field type its passing data to. At the moment I'm having to use a huge set of if else statements to check each value in turn and throw Exceptions if there not, so I was wondering if anyone knows of an easier way to check whether a given PHP type is compatible with a given MySQL field type. I'm sure this must be a problem that's been faced before and if someone could suggest a solution it would save me a great deal of coding and be much appreciated.

Thanks in advance

Answer 1

You're putting it wrong.
It is not table structure that dictates the data format, but your application logic. Say, there is a string that should contain only az letters. You cannot tell it from the field type.
Yes, there are some formats that can be easily validated, like data or integers, but they are mere exceptions and can't be of much help.

Most of time form validation is indeed a long code with custom validations and you cannot avoid it. However, I wouldn't throw exceptions in case of failed validation as it is considered more user friendly to show all the errors occurred, not just one.

If you still want some automated checking - look for some ORM, which will indeed do some validations... for the price of writing much more code in the model, than you writing right now with your validations :)