Add extra field to login

So I got this far. I first connect to the database, validate the customer ID that is entered into the form, then do something with it. The problem is that I am getting a SQL error when entering letters into the form, saying “mysql_num_rows() expects parameter 1 to be resource, boolean”.

Also, I am embedding a shortcode into this function using the “do_shortcode(‘shortcode’)” function and it’s showing the name of the shortcode as text rather than actually populating the shortcode data.

function restrictForum(){
	$db_name = 'dbname';
	$con = mysql_connect("url","username","password");
	mysql_select_db("$db_name")or die("cannot select DB");
	$cust_id = mysql_real_escape_string($_GET['cid']);
	$sql = "SELECT * FROM customer_data WHERE customer_number = $cust_id";
	$result= mysql_query($sql);
if ( isset( $_GET['cid'] ) && !empty( $_GET['cid'] ) && mysql_num_rows($result) == 1) {
// cid (customer ID) is present, show the bbPress login form
echo do_shortcode('bbp-login');

} elseif ( $_GET['error'] == true ) {

// cid entered was not valid
echo 'The customer ID you entered is not valid.';

} else {
echo ('<form name="cust-form" id="cust-form" method="get">
<label for="cid">Enter Your Customer #</label><input name="cid" id="cid" type="text" maxlength="6" />
<input type="submit" value="Validate"');
// cid is absent so show the form to validate it

// do your custom form here that asks for the customer ID. Then if the customer ID
// is correct/valid reload this page like /login?cid=123456 which will show
// the bbPress login form.
}
}
add_shortcode('forum-login-restrict','restrictForum');

While I am interested in adding login fields, I don’t have an answer for you, in particular regarding other databases.

I can help with do_shortcode() though. The function is expecting the square brackets as part of the tag parameter passed. This enables all the various forms with arguments and end tags to be properly interpreted as well. So just do echo do_shortcode('[bbp-login]');

That is really weird, I tried that before and it didn’t work. I think I had some code that was messing it up. It now works.

I almost have this whole thing working, but when I enter letters as a customer ID (which is invalid), I get a SQL error rather than an expected error:

function restrictForum(){
	$db_name = 'dbname';
	$con = mysql_connect("url","username","password");
	mysql_select_db("$db_name")or die("cannot select DB");
	$cust_id = mysql_real_escape_string($_GET['cid']);
	$sql = "SELECT * FROM customer_data WHERE customer_number = $cust_id";
	$result= mysql_query($sql);
		if ( isset( $_GET['cid'] ) && !empty( $_GET['cid'] ) && mysql_num_rows($result) == 1) {
			// cid (customer ID) is present, show the bbPress login form
			echo ('Please enter your username and password to continue.</br>');
			echo  do_shortcode('[bbp-login]');

		} elseif ( $_GET['error'] == true ) {

			// cid entered was not valid
			echo 'The customer ID you entered is not valid.';

		} else {
			echo ('<form name="cust-form" id="cust-form" method="get">
			<label for="cid">Enter Your Customer #</label><input name="cid" id="cid" type="text" maxlength="6" />
			<input type="submit" value="Validate"');
			// cid is absent so show the form to validate it

			// do your custom form here that asks for the customer ID. Then if the customer ID
			// is correct/valid reload this page like /login?cid=123456 which will show
			// the bbPress login form.
		}
}
add_shortcode('forum-login-restrict','restrictForum');

Just got the whole thing working, except I still get the sql error with varchars:

function restrictForum(){
	$db_name = 'dbname';
	$con = mysql_connect("url","username","password");
	mysql_select_db("$db_name")or die("cannot select DB");
	$cust_id = mysql_real_escape_string($_GET['cid']);
	$sql = "SELECT * FROM customer_data WHERE customer_number = $cust_id";
	$result= mysql_query($sql);
	$cust_id_form = ('<form name="cust-form" id="cust-form" method="get">
			<label for="cid">Enter Your Customer #</label><input name="cid" id="cid" type="text" maxlength="6" />
			<input type="submit" value="Validate" />');
		if ( isset( $_GET['cid'] ) && !empty( $_GET['cid'] ) && mysql_num_rows($result) == 1) {
			// cid (customer ID) is present, show the bbPress login form
			echo ('Please enter your username and password to continue.</br>');
			echo  do_shortcode('[bbp-login]');

		} elseif ( $_GET['error'] == true ) {

			// cid entered was not valid
			echo 'The customer ID you entered is not valid.';

		} elseif (!is_user_logged_in()){
			echo $cust_id_form;
		}
}
add_shortcode('forum-login-restrict','restrictForum');