[nycphp-talk] Need help understanding NULL

Daniel Convissor danielc at
Sun Aug 30 00:05:43 EDT 2009


On Sat, Aug 29, 2009 at 07:09:05PM -0700, Kristina D. H. Anderson wrote:
> >>But in the case of a form, wouldn't you be validating the input before
> >>trying to insert the record? Sorry if I seem dense--I must be
> >>misunderstanding something.
> No, you are exactly right, and you'll want to use a combination of 
> client-side (form) validation and good database design

Client side validation is only good for helping the user not make 
mistakes.  Server side validation/escaping/prepared statements is 
required for security reasons.

> Also sometimes you're not dealing with forms, let's say you have a web 
> service that's sending you XML which gets processed and goes right into 
> the database
> so the best way you're able to generate an error if fields are 
> missing is if the query doesn't execute.

For some value of "best."  It's generally nicer to validate the XML 
against a schema file using DOMDocument::schemaValidate().


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