public static function Query($sql, $print = false) {
        self::$count++;
        
        $result = mysqli_query(self::$link, $sql);
		
// @TODO Remove the following lines when in production mode 
// ..............................................     
        if( $result === false || $print === 1 ) { 
         
			$error =  mysqli_error(self::$link);
            $trace =  debug_backtrace(); 
            $out   = array(1 => '');
            
            if( !empty($error) )
                preg_match("#'(.+?)'#is", $error, $out);
          
            $head = $error ? '<b style="color:red">MySQL error: </b><br> 
            <b style="color:green">'. $error .'</b><br><br>':NULL;     
          
            $error_log = date("Y-m-d h:i:s") .' '. $head .' 
            <b>Query: </b><br> 
            <pre><span style="color:#990099">'
            . str_replace($out[1], '<b style="color:red">'. $out[1] .'</b>', $trace[0]['args'][0])
            .'</pre></span><br><br>
            <b>File: </b><b style="color:#660099">'. $trace[0]['file'] .'</b><br> 
            <b>Line: </b><b style="color:#660099">'. $trace[0]['line'] .'</b>'; 
            die($error_log); 
        } 
          else {
// ..............................................
            return $result;
		}			
    }