check for duplicate username in input form

[ibda12u]

I'm going crazy with some code I've got. I have a signup form, that asks for a username.
I'm trying to build and if else statement that won't insert data into the table if the username is already in the table.

This is my code.
[code]
if($AcceptTerms=="" || $UserPlan=="" ){$errors=1; $error.="<li>You did not enter one or more of the required fields. Please go back and try again.";
} [b]if[/b]($errors==1){ echo $error;}
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query2="SELECT Username FROM signup where Username='".$Username."'";
$result2=mysql_query($query2) or die(mysql_error());
$num_rows=mysql_num_rows($result2);
[b]if [/b]($num_rows == 1)
{ echo 'Username in use, hit back button please';
}[b]else[/b] {
$where_form_is="http".($HTTP_SERVER_VARS["HTTPS"]=="on"?"s":"")."://".$SERVER_NAME.strrev(strstr(strrev($PHP_SELF),"/"));
$message="Username: ".$Username."NewPassword1: ".$NewPassword1."NewPassword2:".$NewPassword2."
AcceptTerms: ".$AcceptTerms."UserPlan: ".$UserPlan." ";
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query="insert into signup(Username,NewPassword1,NewPassword2,AcceptTerms,UserPlan) values ('".$Username."','".$NewPassword1."','".$NewPassword2."','".$AcceptTerms."','".$UserPlan."')";
mysql_query($query);
?>
<?php
}
?>[/code]

The code pretty much ignores my code to check the db for the username, and goes ahead and inserts the duplicate username and info in the DB.

Any idea's?

[joecooper]

replace:

$query2="SELECT Username FROM signup where Username='".$Username."'";

with:

$query2="SELECT * FROM signup where Username='$Username'";

you pissed it up

[ibda12u]

Same problem after that change :(

[joecooper]

if ($AcceptTerms=="" || $UserPlan=="" ){
$errors=1; $error.="<li>You did not enter one or more of the required fields. Please go back and try again.";
}
if($errors==1){
echo "$error";
}
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query2="SELECT Username FROM signup where Username='".$Username."'";
$result2=mysql_query($query2) or die(mysql_error());
$num_rows=mysql_num_rows($result2);
if($num_rows == 1){
echo 'Username in use, hit back button please';
}else{
$where_form_is="http".($HTTP_SERVER_VARS["HTTPS"]=="on"?"s":"")."://".$SERVER_NAME.strrev(strstr(strrev($PHP_SELF),"/"));
$message="Username: ".$Username."NewPassword1: ".$NewPassword1."NewPassword2:".$NewPassword2."
AcceptTerms: ".$AcceptTerms."UserPlan: ".$UserPlan." ";
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query="insert into signup(Username,NewPassword1,NewPassword2,AcceptTerms,UserPlan) values ('".$Username."','".$NewPassword1."','".$NewPassword2."','".$AcceptTerms."','".$UserPlan."')";
mysql_query($query);
}
?>


ive neatened it up a bit, to be honest, this whole code is a mess. so much unneeded. add me on my msn - [email protected] , dont email as i cannot recieve emails at this time.

[ibda12u]

[!--quoteo(post=353451:date=Mar 9 2006, 06:14 PM:name=joecooper)--][div class=\'quotetop\']QUOTE(joecooper @ Mar 9 2006, 06:14 PM) [snapback]353451[/snapback][/div][div class=\'quotemain\'][!--quotec--]
if ($AcceptTerms=="" || $UserPlan=="" ){
$errors=1; $error.="<li>You did not enter one or more of the required fields. Please go back and try again.";
}
if($errors==1){
echo "$error";
}
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query2="SELECT Username FROM signup where Username='".$Username."'";
$result2=mysql_query($query2) or die(mysql_error());
$num_rows=mysql_num_rows($result2);
if($num_rows == 1){
echo 'Username in use, hit back button please';
}else{
$where_form_is="http".($HTTP_SERVER_VARS["HTTPS"]=="on"?"s":"")."://".$SERVER_NAME.strrev(strstr(strrev($PHP_SELF),"/"));
$message="Username: ".$Username."NewPassword1: ".$NewPassword1."NewPassword2:".$NewPassword2."
AcceptTerms: ".$AcceptTerms."UserPlan: ".$UserPlan." ";
$link = mysql_connect("localhost","data","passwd");
mysql_select_db("data",$link);
$query="insert into signup(Username,NewPassword1,NewPassword2,AcceptTerms,UserPlan) values ('".$Username."','".$NewPassword1."','".$NewPassword2."','".$AcceptTerms."','".$UserPlan."')";
mysql_query($query);
}
?>
ive neatened it up a bit, to be honest, this whole code is a mess. so much unneeded. add me on my msn - [email protected] , dont email as i cannot recieve emails at this time.
[/quote]

Hmm... that still didn't resolve it. I added you as a buddy. msn - [email protected]
It still just ignores the username I've inputted and adds it