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<?php

/**

* 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;

}