ci-bonfire / Sprint

system/database/DB.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 51 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * 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.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Initialize the database
 *
 * @category	Database
 * @author	EllisLab Dev Team
 * @link	http://codeigniter.com/user_guide/database/
 *
 * @param 	string|string[]	$params
 * @param 	bool		$query_builder_override
 *				Determines if query builder should be used or not
 */
function &DB($params = '', $query_builder_override = NULL)
{
	// Load the DB config file if a DSN string wasn't passed
	if (is_string($params) && strpos($params, '://') === FALSE)
	{
		// Is the config file in the environment folder?
		if ( ! file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/database.php')
			&& ! file_exists($file_path = APPPATH.'config/database.php'))
		{
			show_error('The configuration file database.php does not exist.');
		}

		include($file_path);

		// Make packages contain database config files,
		// given that the controller instance already exists
		if (class_exists('CI_Controller', FALSE))
		{
			foreach (get_instance()->load->get_package_paths() as $path)
			{
				if ($path !== APPPATH)
				{
					if (file_exists($file_path = $path.'config/'.ENVIRONMENT.'/database.php'))
					{
						include($file_path);
					}
					elseif (file_exists($file_path = $path.'config/database.php'))
					{
						include($file_path);
					}
				}
			}
		}

		if ( ! isset($db) OR count($db) === 0)
		{
			show_error('No database connection settings were found in the database config file.');
		}

		if ($params !== '')
		{
			$active_group = $params;
		}

		if ( ! isset($active_group))
		{
			show_error('You have not specified a database connection group via $active_group in your config/database.php file.');
		}
		elseif ( ! isset($db[$active_group]))
		{
			show_error('You have specified an invalid database connection group ('.$active_group.') in your config/database.php file.');
		}

		$params = $db[$active_group];
	}
	elseif (is_string($params))
	{
		/**
		 * Parse the URL from the DSN string
		 * Database settings can be passed as discreet
		 * parameters or as a data source name in the first
		 * parameter. DSNs must have this prototype:
		 * $dsn = 'driver://username:password@hostname/database';
		 */
		if (($dsn = @parse_url($params)) === FALSE)
		{
			show_error('Invalid DB Connection String');
		}

		$params = array(
			'dbdriver'	=> $dsn['scheme'],
			'hostname'	=> isset($dsn['host']) ? rawurldecode($dsn['host']) : '',
			'port'		=> isset($dsn['port']) ? rawurldecode($dsn['port']) : '',
			'username'	=> isset($dsn['user']) ? rawurldecode($dsn['user']) : '',
			'password'	=> isset($dsn['pass']) ? rawurldecode($dsn['pass']) : '',
			'database'	=> isset($dsn['path']) ? rawurldecode(substr($dsn['path'], 1)) : ''
		);

		// Were additional config items set?
		if (isset($dsn['query']))
		{
			parse_str($dsn['query'], $extra);

			foreach ($extra as $key => $val)
			{
				if (is_string($val) && in_array(strtoupper($val), array('TRUE', 'FALSE', 'NULL')))
				{
					$val = var_export($val, TRUE);
				}

				$params[$key] = $val;
			}
		}
	}

	// No DB specified yet? Beat them senseless...
	if (empty($params['dbdriver']))
	{
		show_error('You have not selected a database type to connect to.');
	}

	// Load the DB classes. Note: Since the query builder class is optional
	// we need to dynamically create a class that extends proper parent class
	// based on whether we're using the query builder class or not.
	if ($query_builder_override !== NULL)
	{
		$query_builder = $query_builder_override;
	}
	// Backwards compatibility work-around for keeping the
	// $active_record config variable working. Should be
	// removed in v3.1
	elseif ( ! isset($query_builder) && isset($active_record))
	{
		$query_builder = $active_record;
	}

	require_once(BASEPATH.'database/DB_driver.php');

	if ( ! isset($query_builder) OR $query_builder === TRUE)
	{
		require_once(BASEPATH.'database/DB_query_builder.php');
		if ( ! class_exists('CI_DB', FALSE))
		{
			/**
			 * CI_DB
			 *
			 * Acts as an alias for both CI_DB_driver and CI_DB_query_builder.
			 *
			 * @see	CI_DB_query_builder
			 * @see	CI_DB_driver
			 */
			class CI_DB extends CI_DB_query_builder { }
		}
	}
	elseif ( ! class_exists('CI_DB', FALSE))
	{
		/**
	 	 * @ignore
		 */
		class CI_DB extends CI_DB_driver { }
	}

	// Load the DB driver
	$driver_file = BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_driver.php';

	file_exists($driver_file) OR show_error('Invalid DB driver');
	require_once($driver_file);

	// Instantiate the DB adapter
	$driver = 'CI_DB_'.$params['dbdriver'].'_driver';
	$DB = new $driver($params);

	// Check for a subdriver
	if ( ! empty($DB->subdriver))
	{
		$driver_file = BASEPATH.'database/drivers/'.$DB->dbdriver.'/subdrivers/'.$DB->dbdriver.'_'.$DB->subdriver.'_driver.php';

		if (file_exists($driver_file))
		{
			require_once($driver_file);
			$driver = 'CI_DB_'.$DB->dbdriver.'_'.$DB->subdriver.'_driver';
			$DB = new $driver($params);
		}
	}

	$DB->initialize();
	return $DB;
}