Program: CWE-89
Project: CVE-2016-2555
Buggy source:
<?php
/************************************************************************/
/* ATutor																*/
/************************************************************************/
/* Copyright (c) 2002-2013              								*/
/* Inclusive Design Institute                                           */
/* http://atutor.ca                                                     */
/* This program is free software. You can redistribute it and/or        */
/* modify it under the terms of the GNU General Public License          */
/* as published by the Free Software Foundation.                        */
/************************************************************************/
// $Id$
if (AT_INCLUDE_PATH !== 'NULL') {

    function at_db_connect($db_host, $db_port, $db_login, $db_password, $db_name){
         if(defined('MYSQLI_ENABLED')){
            if($db_name == ''){
                $db = new mysqli($db_host, $db_login, $db_password);
                //$db->query("SET NAMES 'utf8'"); 
                $db->set_charset("utf8");
            }else{
                $db = new mysqli($db_host, $db_login,$db_password, $db_name, $db_port);
                //$db->query("SET NAMES 'utf8'"); 
                $db->set_charset("utf8");
            }
         } else{
            $db = @mysql_connect($db_host . ':' . $db_port, $db_login, $db_password);
            
         }   
        if (!$db) {
            // AT_ERROR_NO_DB_CONNECT 
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            trigger_error('VITAL#Unable to connect to db.', E_USER_ERROR);
            exit;
        }

        return $db;
    }

    function at_db_select($db_name, $db){
     if(defined('MYSQLI_ENABLED')){
        if(!$db->select_db($db_name)){
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            //trigger_error('VITAL#DB connection established, but database "'.$db_name.'" cannot be selected.',
            //                E_USER_ERROR);
            //exit;
        }

     }else{
        if (!@mysql_select_db($db_name, $db)) {
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            //trigger_error('VITAL#DB connection established, but database "'.$db_name.'" cannot be selected.',
            //                E_USER_ERROR);
            //exit;
        }
     }
 
    }

}
function at_is_db($db_name, $db){
    // see if a database exists
  if(defined('MYSQLI_ENABLED')){
    $sql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '$db_name'";
    $result = $db->query($sql);
    $exists = $result->num_rows;
  }else{
    $sql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '$db_name'";
    $result = mysql_query($sql, $db);
    $exists = mysql_num_rows($result);
  }
  return $exists;
}
//functions for properly escaping input strings
function my_add_null_slashes( $string ) {
    global $db;
    if(defined('MYSQLI_ENABLED')){
        return $db->real_escape_string(stripslashes($string));
    }else{
        return mysql_real_escape_string(stripslashes($string));
    }

}

function my_null_slashes($string) {
    return $string;
}

if ( get_magic_quotes_gpc() == 1 ) {
    $addslashes   = 'my_add_null_slashes';
    $stripslashes = 'stripslashes';
} else {
    if(defined('MYSQLI_ENABLED')){
        // mysqli_real_escape_string requires 2 params, breaking wherever
        // current $addslashes with 1 param exists. So hack with trim and 
        // manually run mysqli_real_escape_string requires during sanitization below
        $addslashes   = 'trim';
    }else{
        $addslashes   = 'mysql_real_escape_string';
    }
    $stripslashes = 'my_null_slashes';
}

/**
 * This function is used to make a DB query the same along the whole codebase
 * @access  public
 * @param   $query = Query string in the vsprintf format. Basically the first parameter of vsprintf function
 * @param   $params = Array of parameters which will be converted and inserted into the query
 * @param   $oneRow = Function returns the first element of the return array if set to TRUE. Basically returns the first row if it exists
 * @param   $sanitize = if True then addslashes will be applied to every parameter passed into the query to prevent SQL injections
 * @param   $callback_func = call back another db function, default mysql_affected_rows
 * @param   $array_type = Type of array, MYSQL_ASSOC (default), MYSQL_NUM, MYSQL_BOTH, etc.
 * @return  ALWAYS returns result of the query execution as an array of rows. If no results were found than array would be empty
 * @author  Alexey Novak, Cindy Li, Greg Gay
 */
function queryDB($query, $params=array(), $oneRow = false, $sanitize = true, $callback_func = "mysql_affected_rows", $array_type = MYSQL_ASSOC) {
    if(defined('MYSQLI_ENABLED') && $callback_func == "mysql_affected_rows"){
        $callback_func = "mysqli_affected_rows";
    }
    $sql = create_sql($query, $params, $sanitize);
    return execute_sql($sql, $oneRow, $callback_func, $array_type);

}
function queryDButf8($query, $params=array(), $oneRow = true, $sanitize, $db, $array_type = MYSQL_ASSOC) {
    global $msg, $addslashes;

    if ($sanitize) {
        foreach($params as $i=>$value) {
         if(defined('MYSQLI_ENABLED')){  
             $value = $addslashes(htmlspecialchars_decode($value, ENT_QUOTES));  
             $params[$i] = $db->real_escape_string($value);
            }else {
             $params[$i] = $addslashes($value);           
            }
        }
    }

    $sql = vsprintf($query, $params);

    if(defined('MYSQLI_ENABLED')){
           $result = $db->query($sql) or (error_log(print_r($db->error . "\nSQL: " . $sql, true), 0) and $msg->addError($displayErrorMessage));                

    }else{
           $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
    }
    if ($oneRow) {
          if(defined('MYSQLI_ENABLED')){            
            $row = $result->fetch_array($array_type);              

          }else {
            $row = mysql_fetch_array($result, $array_type);              
          }

        // Check that there are no more than 1 row expected.
          if(defined('MYSQLI_ENABLED')){
               if ($result->fetch_array($array_type)) {
                $msg->addError($displayErrorMessage);
                return at_affected_rows($db);
                }           
          }else{
              if (mysql_fetch_array($result, $array_type)) {
                $msg->addError($displayErrorMessage);
                return at_affected_rows($db);
                }            
          }

        unset($result);
        return ($row) ? $row : array();
    } else{
        return $result;
    }
}
function sqlout($sql){
    //output the sql with variable values inserted
    global $sqlout;
    $sqlout = $sql;
}

function create_sql($query, $params=array(), $sanitize = true){
    global $addslashes, $db;
    // Prevent sql injections through string parameters passed into the query
    if ($sanitize) {
        foreach($params as $i=>$value) {
         if(defined('MYSQLI_ENABLED')){  
             $value = $addslashes(htmlspecialchars_decode($value, ENT_QUOTES));  
             $params[$i] = $db->real_escape_string($value);
            }else {
             $params[$i] = $addslashes($value);           
            }
        }
    }

    $sql = vsprintf($query, $params);
    return $sql;
}
function execute_sql($sql, $oneRow, $callback_func, $array_type){
    global $db, $msg;
    
    $oneRowErrorMessage = 'Query "%s" which should returned only 1 row has returned more rows.';
    $displayErrorMessage = array('DB_QUERY', date('m/d/Y h:i:s a', time()));
    
    try {
        sqlout($sql);
        $oneRowErrorMessage = sprintf($oneRowErrorMessage, $sql);
        // NOTE ! Uncomment the error_log() line below to start logging database queries to your php_error.log. 
        // BUT  ! Use for debugging purposes ONLY. Creates very large logs if left running.
        
    //error_log(print_r($sql, true), 0);    
    
        // Query DB and if something goes wrong then log the problem
        if(defined('MYSQLI_ENABLED')){
               $result = $db->query($sql) or (error_log(print_r($db->error . "\nSQL: " . $sql, true), 0) and $msg->addError($displayErrorMessage));                

        }else{
               $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
        }
        
        // If the query was of the type which does not suppose to return rows e.g. UPDATE/SELECT/INSERT
        // is_bool is for mysql compatibility
        // === null is for mysqli compatibility
        if (is_bool($result) || $result === null) {
            if ($oneRow) {
                //error_log(print_r($oneRowErrorMessage, true), 0);
                $msg->addError($displayErrorMessage);
            }
            if(isset($callback_func)){
                return $callback_func($db);                
            }else{
                return array();
            }
        }
        
        // If we need only one row then just grab it otherwise get all the results
        if ($oneRow) {
              if(defined('MYSQLI_ENABLED')){            
                $row = $result->fetch_array($array_type);              

              }else {
                $row = mysql_fetch_array($result, $array_type);              
              }

            // Check that there are no more than 1 row expected.
            
              if(defined('MYSQLI_ENABLED')){
                   if ($result->fetch_array($array_type)) {
                    //error_log(print_r($oneRowErrorMessage, true), 0);
                    $msg->addError($displayErrorMessage);
                    return at_affected_rows($db);
                    }           
              }else{
                  if (mysql_fetch_array($result, $array_type)) {
                    error_log(print_r($oneRowErrorMessage, true), 0);
                    $msg->addError($displayErrorMessage);
                    return at_affected_rows($db);
                    }            
              }

            unset($result);
            return ($row) ? $row : array();
        }
        
        $resultArray = array();
        if(defined('MYSQLI_ENABLED')){
            while ($row = $result->fetch_array($array_type)) {
                $resultArray[] = $row;
            }    
        }else{
            while ($row = mysql_fetch_array($result, $array_type)) {
                $resultArray[] = $row;
            }
        }
        unset($result);
        return $resultArray;
    } catch (Exception $e) {
        error_log(print_r($e, true), 0);
        $msg->addError($displayErrorMessage);
    }
}
function queryDBresult($sql, $params = array(), $sanitize = true){
        global $db, $msg;
        $sql = create_sql($sql, $params, $sanitize);

        if(defined('MYSQLI_ENABLED')){
               $result = $db->query($sql) or (error_log(print_r(mysqli_error(), true), 0) and $msg->addError($displayErrorMessage));        

        }else{
               $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
        }
       
    return $result;
}
function at_affected_rows($db){
    if(defined('MYSQLI_ENABLED')){
        return $db->affected_rows;    
    }else{
        return mysql_affected_rows($db);
    }
}
function at_db_version($db){
 	$sql = "SELECT VERSION() AS version";	
 	if(defined('MYSQLI_ENABLED')){ 
        $result = $db->query($sql);
        $row = $result->fetch_assoc();	
 	}else{
        $result = mysql_query($sql, $db);
        $row = mysql_fetch_assoc($result);
	}
	return $row;
}	
function at_db_create($sql, $db){
 	if(defined('MYSQLI_ENABLED')){	
        $result = $db->query($sql);	
 	}else{
        $result = mysql_query($sql, $db);
    }
    return $result;
}

function at_insert_id(){
    global $db;
    if(defined('MYSQLI_ENABLED')){
        return $db->insert_id;
    }else{
        return mysql_insert_id($db);
    }
}
function at_db_errno(){
    global $db;
    if(defined('MYSQLI_ENABLED')){    
        return $db->errno;
    }else{
        return mysql_errno($db);
    }
}
function at_db_error(){
    global $db;
    if(defined('MYSQLI_ENABLED')){    
        return $db->error; 
    }else{
        return mysql_error($db);
    }
}

/////////
/// USED in classes/CSVExport.class.php & CSVImport.class.php
function at_field_type($result, $i){
    if(defined('MYSQLI_ENABLED')){  
        // Convert mysqli integer types to mysql string types
        $metatype = $result->fetch_field_direct($i)->type;
        if(in_array($metatype, array('1','2','3','8','9'))){
            return "int";
        }else if (in_array($metatype, array('249','250','251','252',))){
            return "blob";
        }else if(in_array($metatype, array('247', '248', '253', '254'))){
            return "string";
        } else if(in_array($metatype, array('0', '4','5'))){
            return "real";
        }else if(in_array($metatype, array('12'))){
            return "datetime";
        }else if(in_array($metatype, array('10'))){
            return "date";
        }else if(in_array($metatype, array('7'))){
            return "timestamp";
        }  
    }else{
        return mysql_field_type($result, $i);    
    }

}
function at_num_fields($result){
    if(defined('MYSQLI_ENABLED')){   
        return $result->field_count; 
    }else{
        return mysql_num_fields($result);    
    }

}
function at_free_result($result){
    if(defined('MYSQLI_ENABLED')){  
        return $result->free_result;   
    }else{
        return mysql_free_result($result);    
    }

}
function at_is_field_a_primary_key($result, $i){
    if(defined('MYSQLI_ENABLED')){   
        $meta = mysqli_fetch_field_direct($result, $i);

        return $meta->flags & 2;
    }else{
        $flags = explode(' ', mysql_field_flags($result, $i));
        return in_array('primary_key', $flags);
    }

}
function at_field_name($result, $i){
    if(defined('MYSQLI_ENABLED')){  
        return $result->fetch_field_direct($i)->name;
    }else{
        return mysql_field_name($result, $i);   
    }
}

////
?>

Fixed version (ground truth):
<?php
/************************************************************************/
/* ATutor																*/
/************************************************************************/
/* Copyright (c) 2002-2013              								*/
/* Inclusive Design Institute                                           */
/* http://atutor.ca                                                     */
/* This program is free software. You can redistribute it and/or        */
/* modify it under the terms of the GNU General Public License          */
/* as published by the Free Software Foundation.                        */
/************************************************************************/
// $Id$
if (AT_INCLUDE_PATH !== 'NULL') {

    function at_db_connect($db_host, $db_port, $db_login, $db_password, $db_name){
         if(defined('MYSQLI_ENABLED')){
            if($db_name == ''){
                $db = new mysqli($db_host, $db_login, $db_password);
                //$db->query("SET NAMES 'utf8'"); 
                $db->set_charset("utf8");
            }else{
                $db = new mysqli($db_host, $db_login,$db_password, $db_name, $db_port);
                //$db->query("SET NAMES 'utf8'"); 
                $db->set_charset("utf8");
            }
         } else{
            $db = @mysql_connect($db_host . ':' . $db_port, $db_login, $db_password);
            
         }   
        if (!$db) {
            // AT_ERROR_NO_DB_CONNECT 
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            trigger_error('VITAL#Unable to connect to db.', E_USER_ERROR);
            exit;
        }

        return $db;
    }

    function at_db_select($db_name, $db){
     if(defined('MYSQLI_ENABLED')){
        if(!$db->select_db($db_name)){
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            //trigger_error('VITAL#DB connection established, but database "'.$db_name.'" cannot be selected.',
            //                E_USER_ERROR);
            //exit;
        }

     }else{
        if (!@mysql_select_db($db_name, $db)) {
            require_once(AT_INCLUDE_PATH . 'classes/ErrorHandler/ErrorHandler.class.php');
            $err = new ErrorHandler();
            //trigger_error('VITAL#DB connection established, but database "'.$db_name.'" cannot be selected.',
            //                E_USER_ERROR);
            //exit;
        }
     }
 
    }

}
function at_is_db($db_name, $db){
    // see if a database exists
  if(defined('MYSQLI_ENABLED')){
    $sql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '$db_name'";
    $result = $db->query($sql);
    $exists = $result->num_rows;
  }else{
    $sql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '$db_name'";
    $result = mysql_query($sql, $db);
    $exists = mysql_num_rows($result);
  }
  return $exists;
}
//functions for properly escaping input strings
function my_add_null_slashes( $string ) {
    global $db;
    if(defined('MYSQLI_ENABLED')){
        return $db->real_escape_string(stripslashes($string));
    }else{
        return mysql_real_escape_string(stripslashes($string));
    }

}

function my_null_slashes($string) {
    return $string;
}

if ( get_magic_quotes_gpc() == 1 ) {
    $addslashes   = 'my_add_null_slashes';
    $stripslashes = 'stripslashes';
} else {
    // if get_magic_quotes_gpc is off, we set our own handler
    $addslashes   = 'mysql_real_escape_string';
    $stripslashes = 'my_null_slashes';
}

/**
 * This function is used to make a DB query the same along the whole codebase
 * @access  public
 * @param   $query = Query string in the vsprintf format. Basically the first parameter of vsprintf function
 * @param   $params = Array of parameters which will be converted and inserted into the query
 * @param   $oneRow = Function returns the first element of the return array if set to TRUE. Basically returns the first row if it exists
 * @param   $sanitize = if True then addslashes will be applied to every parameter passed into the query to prevent SQL injections
 * @param   $callback_func = call back another db function, default mysql_affected_rows
 * @param   $array_type = Type of array, MYSQL_ASSOC (default), MYSQL_NUM, MYSQL_BOTH, etc.
 * @return  ALWAYS returns result of the query execution as an array of rows. If no results were found than array would be empty
 * @author  Alexey Novak, Cindy Li, Greg Gay
 */
function queryDB($query, $params=array(), $oneRow = false, $sanitize = true, $callback_func = "mysql_affected_rows", $array_type = MYSQL_ASSOC) {
    if(defined('MYSQLI_ENABLED') && $callback_func == "mysql_affected_rows"){
        $callback_func = "mysqli_affected_rows";
    }
    $sql = create_sql($query, $params, $sanitize);
    return execute_sql($sql, $oneRow, $callback_func, $array_type);

}
function queryDButf8($query, $params=array(), $oneRow = true, $sanitize, $db, $array_type = MYSQL_ASSOC) {
    global $msg, $addslashes;

    if ($sanitize) {
        foreach($params as $i=>$value) {
         if(defined('MYSQLI_ENABLED')){  
             $value = $addslashes(htmlspecialchars_decode($value, ENT_QUOTES));  
             $params[$i] = $db->real_escape_string($value);
            }else {
             $params[$i] = $addslashes($value);           
            }
        }
    }

    $sql = vsprintf($query, $params);

    if(defined('MYSQLI_ENABLED')){
           $result = $db->query($sql) or (error_log(print_r($db->error . "\nSQL: " . $sql, true), 0) and $msg->addError($displayErrorMessage));                

    }else{
           $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
    }
    if ($oneRow) {
          if(defined('MYSQLI_ENABLED')){            
            $row = $result->fetch_array($array_type);              

          }else {
            $row = mysql_fetch_array($result, $array_type);              
          }

        // Check that there are no more than 1 row expected.
          if(defined('MYSQLI_ENABLED')){
               if ($result->fetch_array($array_type)) {
                $msg->addError($displayErrorMessage);
                return at_affected_rows($db);
                }           
          }else{
              if (mysql_fetch_array($result, $array_type)) {
                $msg->addError($displayErrorMessage);
                return at_affected_rows($db);
                }            
          }

        unset($result);
        return ($row) ? $row : array();
    } else{
        return $result;
    }
}
function sqlout($sql){
    //output the sql with variable values inserted
    global $sqlout;
    $sqlout = $sql;
}

function create_sql($query, $params=array(), $sanitize = true){
    global $addslashes, $db;
    // Prevent sql injections through string parameters passed into the query
    if ($sanitize) {
        foreach($params as $i=>$value) {
         if(defined('MYSQLI_ENABLED')){  
             $value = $addslashes(htmlspecialchars_decode($value, ENT_QUOTES));  
             $params[$i] = $db->real_escape_string($value);
            }else {
             $params[$i] = $addslashes($value);           
            }
        }
    }

    $sql = vsprintf($query, $params);
    return $sql;
}
function execute_sql($sql, $oneRow, $callback_func, $array_type){
    global $db, $msg;
    
    $oneRowErrorMessage = 'Query "%s" which should returned only 1 row has returned more rows.';
    $displayErrorMessage = array('DB_QUERY', date('m/d/Y h:i:s a', time()));
    
    try {
        sqlout($sql);
        $oneRowErrorMessage = sprintf($oneRowErrorMessage, $sql);
        // NOTE ! Uncomment the error_log() line below to start logging database queries to your php_error.log. 
        // BUT  ! Use for debugging purposes ONLY. Creates very large logs if left running.
        
    //error_log(print_r($sql, true), 0);    
    
        // Query DB and if something goes wrong then log the problem
        if(defined('MYSQLI_ENABLED')){
               $result = $db->query($sql) or (error_log(print_r($db->error . "\nSQL: " . $sql, true), 0) and $msg->addError($displayErrorMessage));                

        }else{
               $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
        }
        
        // If the query was of the type which does not suppose to return rows e.g. UPDATE/SELECT/INSERT
        // is_bool is for mysql compatibility
        // === null is for mysqli compatibility
        if (is_bool($result) || $result === null) {
            if ($oneRow) {
                //error_log(print_r($oneRowErrorMessage, true), 0);
                $msg->addError($displayErrorMessage);
            }
            if(isset($callback_func)){
                return $callback_func($db);                
            }else{
                return array();
            }
        }
        
        // If we need only one row then just grab it otherwise get all the results
        if ($oneRow) {
              if(defined('MYSQLI_ENABLED')){            
                $row = $result->fetch_array($array_type);              

              }else {
                $row = mysql_fetch_array($result, $array_type);              
              }

            // Check that there are no more than 1 row expected.
            
              if(defined('MYSQLI_ENABLED')){
                   if ($result->fetch_array($array_type)) {
                    //error_log(print_r($oneRowErrorMessage, true), 0);
                    $msg->addError($displayErrorMessage);
                    return at_affected_rows($db);
                    }           
              }else{
                  if (mysql_fetch_array($result, $array_type)) {
                    error_log(print_r($oneRowErrorMessage, true), 0);
                    $msg->addError($displayErrorMessage);
                    return at_affected_rows($db);
                    }            
              }

            unset($result);
            return ($row) ? $row : array();
        }
        
        $resultArray = array();
        if(defined('MYSQLI_ENABLED')){
            while ($row = $result->fetch_array($array_type)) {
                $resultArray[] = $row;
            }    
        }else{
            while ($row = mysql_fetch_array($result, $array_type)) {
                $resultArray[] = $row;
            }
        }
        unset($result);
        return $resultArray;
    } catch (Exception $e) {
        error_log(print_r($e, true), 0);
        $msg->addError($displayErrorMessage);
    }
}
function queryDBresult($sql, $params = array(), $sanitize = true){
        global $db, $msg;
        $sql = create_sql($sql, $params, $sanitize);

        if(defined('MYSQLI_ENABLED')){
               $result = $db->query($sql) or (error_log(print_r(mysqli_error(), true), 0) and $msg->addError($displayErrorMessage));        

        }else{
               $result = mysql_query($sql, $db) or (error_log(print_r(mysql_error(), true), 0) and $msg->addError($displayErrorMessage));
        }
       
    return $result;
}
function at_affected_rows($db){
    if(defined('MYSQLI_ENABLED')){
        return $db->affected_rows;    
    }else{
        return mysql_affected_rows($db);
    }
}
function at_db_version($db){
 	$sql = "SELECT VERSION() AS version";	
 	if(defined('MYSQLI_ENABLED')){ 
        $result = $db->query($sql);
        $row = $result->fetch_assoc();	
 	}else{
        $result = mysql_query($sql, $db);
        $row = mysql_fetch_assoc($result);
	}
	return $row;
}	
function at_db_create($sql, $db){
 	if(defined('MYSQLI_ENABLED')){	
        $result = $db->query($sql);	
 	}else{
        $result = mysql_query($sql, $db);
    }
    return $result;
}

function at_insert_id(){
    global $db;
    if(defined('MYSQLI_ENABLED')){
        return $db->insert_id;
    }else{
        return mysql_insert_id($db);
    }
}
function at_db_errno(){
    global $db;
    if(defined('MYSQLI_ENABLED')){    
        return $db->errno;
    }else{
        return mysql_errno($db);
    }
}
function at_db_error(){
    global $db;
    if(defined('MYSQLI_ENABLED')){    
        return $db->error; 
    }else{
        return mysql_error($db);
    }
}

/////////
/// USED in classes/CSVExport.class.php & CSVImport.class.php
function at_field_type($result, $i){
    if(defined('MYSQLI_ENABLED')){  
        // Convert mysqli integer types to mysql string types
        $metatype = $result->fetch_field_direct($i)->type;
        if(in_array($metatype, array('1','2','3','8','9'))){
            return "int";
        }else if (in_array($metatype, array('249','250','251','252',))){
            return "blob";
        }else if(in_array($metatype, array('247', '248', '253', '254'))){
            return "string";
        } else if(in_array($metatype, array('0', '4','5'))){
            return "real";
        }else if(in_array($metatype, array('12'))){
            return "datetime";
        }else if(in_array($metatype, array('10'))){
            return "date";
        }else if(in_array($metatype, array('7'))){
            return "timestamp";
        }  
    }else{
        return mysql_field_type($result, $i);    
    }

}
function at_num_fields($result){
    if(defined('MYSQLI_ENABLED')){   
        return $result->field_count; 
    }else{
        return mysql_num_fields($result);    
    }

}
function at_free_result($result){
    if(defined('MYSQLI_ENABLED')){  
        return $result->free_result;   
    }else{
        return mysql_free_result($result);    
    }

}
function at_is_field_a_primary_key($result, $i){
    if(defined('MYSQLI_ENABLED')){   
        $meta = mysqli_fetch_field_direct($result, $i);

        return $meta->flags & 2;
    }else{
        $flags = explode(' ', mysql_field_flags($result, $i));
        return in_array('primary_key', $flags);
    }

}
function at_field_name($result, $i){
    if(defined('MYSQLI_ENABLED')){  
        return $result->fetch_field_direct($i)->name;
    }else{
        return mysql_field_name($result, $i);   
    }
}

////
?>