Subversion-Projekte lars-tiefland.ci

<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2018, 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. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://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	https://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;

}