On Tue, 2005-07-05 at 22:36 -0400, Bill McEachran wrote:
> Newbie question.
>
> I'm working my way through IBM's PHP tutorial. Generally good ... but
> I'm stuck at an error point and have no idea what's going wrong.
> Before adding a new row to the mysql database (already opened) we do a
> query to see if a particular record already exists.
> (see $resultT).
>
> We then test, using if, to see if $resultT is true or false. If it's
> false we are then supposed to enter a new record.
> Problem: it's never false. It always evaluates true. What am I doing
> wrong? TIA
>
> /* build query to see if the record is entered already */
> $sqlT = "select * from users where username='".$_POST["name"]."'";
> $resultT = mysql_query($sqlT);
>
> /* Now test -- did we find anything ... if not add this user */
> if (! $resultT) {
> /* here we add the new record if it doesn't already exit /*
>
Although I'm not sure that will work, mysql_num_rows( $resultT ) == 1
will tell you for sure if the user exists or not.
Just remember to addslashes() to $_POST['name'] before doing that query,
so SQL can't be injected.
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