> > Are there characters, maybe non-printing characters, or perhaps
> > even whole phrases, that could cause problems in my database or
> > application if I were to allow users to enter them into that column?
>
> > If so, does anyone happen to have a regular expression handy that you
> > think is a good choice for text columns' CHECK constraint? Or maybe a
> > link to a discussion of this topic?
>
> Nope, there's nothing you can put into a text to break pgsql.
> However, if you are using regular old queries, you'd be advised to use
> pg_escape_string() function in php to prevent SQL injection attacks.
Thanks! I'll check out pg_escape_string() in php, and I see that
PostgreSQL also has something called PQescapeStringConn... I wonder if
I should use both...
Also, I should have asked: what about char and varchar fields? Can
those also handle any characters, as long as I consider SQL injection
attacks?