Easy PDO wrapper class

ezpdo.php

<?php

/**
 * Easy PDO for PHP 5.x
 * Version 1.2
 * 
 * Copyright (c) 2009-2014 Kijin Sung <kijin@kijinsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

class ezPDO extends PDO
{
    // Constructor override.
    
    public function __construct($dsn, $user = null, $pass = null, $options = array())
    {
        // Workaround for the MySQL charset bug in PHP 5.3.6 and below.
        
        if (preg_match('/^mysql:.*charset=([a-z0-9._-]+)/i', $dsn, $matches))
        {
            $options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES ' . $matches[1];
        }
        
        // Workaround for PDO's inconsistent warning/exception behavior.
        
        if (!array_key_exists(PDO::ATTR_ERRMODE, $options))
        {
            $options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
        }
        
        // Workaround for prepared statement emulation "feature".
        
        if (!array_key_exists(PDO::ATTR_EMULATE_PREPARES, $options))
        {
            $options[PDO::ATTR_EMULATE_PREPARES] = false;
        }
        
        // Call the parent class's constructor.
        
        parent::__construct($dsn, $user, $pass, $options);
    }
    
    // Query method override.
    
    public function query($querystring)
    {
        // Retrieve all parameters except the querystring.
        
        $parameters = func_get_args();
        array_shift($parameters);
        
        // Handle the case of a single array containing all parameters.
        
        if (count($parameters) == 1 && is_array($parameters[0]))
        {
            $parameters = $parameters[0];
        }
        
        // If there are any parameters, use a prepared statement.
        
        if (count($parameters))
        {
            $statement = $this->prepare($querystring);
            $statement->execute($parameters);
        }
        else
        {
            $statement = parent::query($querystring);
        }
        
        // Return the PDOStatement object.
        
        return $statement;
    }
    
    // Query and fetch a single value.
    
    public function queryFetchSingle($querystring)
    {
        $parameters = func_get_args();
        $statement = call_user_func_array(array($this, 'query'), $parameters);
        return $statement->fetchColumn();
    }
    
    // Query and fetch all results as associative arrays.
    
    public function queryFetchAll($querystring)
    {
        $parameters = func_get_args();
        $statement = call_user_func_array(array($this, 'query'), $parameters);
        return $statement->fetchAll(PDO::FETCH_ASSOC);
    }
    
    // Query and fetch all results as objects.
    
    public function queryFetchAllObjects($querystring)
    {
        $parameters = func_get_args();
        $statement = call_user_func_array(array($this, 'query'), $parameters);
        return $statement->fetchAll(PDO::FETCH_OBJ);
    }
    
    // Process a string to be used in a LIKE query.
    
    public function likeify($str, $include_percent_chars = true)
    {
        $str = str_replace(array('\\', '%', '_'), array('\\\\', '\\%', '\\_'), $str);
        return $include_percent_chars ? "%$str%" : $str;
    }
}