Zipcode Table

CREATE TABLE IF NOT EXISTS `racecd_cbzipcode` (
  `zipcode` varchar(5) NOT NULL,
  `latitude` double DEFAULT NULL,
  `longitude` double DEFAULT NULL,
  KEY `zipcode` (`zipcode`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;


global  $wpdb;
$wpdb->cbzipcode = $wpdb->prefix.'cbzipcode';
function zipcodes_exists($field, $value) {
    global $wpdb;
        if($field == 'zipcode') { $value = $value;}
        if(empty($value)) return false;
    if ( !$result = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->cbzipcode WHERE $field = %s", $value) ) )
        return false;
    return $result;
}

function zipcodes_latlng($value) {
    global $wpdb;
        $field = 'zipcode';
        if(empty($value)) return false;
    if ( !$result = $wpdb->get_row( $wpdb->prepare("SELECT latitude, longitude FROM $wpdb->cbzipcode WHERE $field = %s", $value) ) )
        return false;
    return $result;
}

//access data
$latlng = zipcodes_latlng($zipcode);
    if($latlng != false){
        update_user_meta($user_id, "latitude", $wpdb->prepare($latlng->latitude));
        update_user_meta($user_id, "longitude", $wpdb->prepare($latlng->longitude));
    }