221 行
6.7 KiB
PHP
221 行
6.7 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* Initialize the database
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*
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/userguide3/database/
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*
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* @param string|string[] $params
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* @param bool $query_builder_override
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* Determines if query builder should be used or not
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*/
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function &DB($params = '', $query_builder_override = NULL)
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{
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// Load the DB config file if a DSN string wasn't passed
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if (is_string($params) && strpos($params, '://') === FALSE)
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{
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// Is the config file in the environment folder?
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if ( ! file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/database.php')
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&& ! file_exists($file_path = APPPATH.'config/database.php'))
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{
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show_error('The configuration file database.php does not exist.');
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}
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include($file_path);
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// Make packages contain database config files,
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// given that the controller instance already exists
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if (class_exists('CI_Controller', FALSE))
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{
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foreach (get_instance()->load->get_package_paths() as $path)
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{
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if ($path !== APPPATH)
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{
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if (file_exists($file_path = $path.'config/'.ENVIRONMENT.'/database.php'))
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{
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include($file_path);
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}
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elseif (file_exists($file_path = $path.'config/database.php'))
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{
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include($file_path);
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}
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}
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}
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}
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if (empty($db))
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{
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show_error('No database connection settings were found in the database config file.');
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}
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if ($params !== '')
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{
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$active_group = $params;
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}
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if ( ! isset($active_group))
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{
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show_error('You have not specified a database connection group via $active_group in your config/database.php file.');
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}
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elseif ( ! isset($db[$active_group]))
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{
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show_error('You have specified an invalid database connection group ('.$active_group.') in your config/database.php file.');
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}
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$params = $db[$active_group];
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}
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elseif (is_string($params))
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{
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/**
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* Parse the URL from the DSN string
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* Database settings can be passed as discreet
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* parameters or as a data source name in the first
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* parameter. DSNs must have this prototype:
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* $dsn = 'driver://username:password@hostname/database';
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*/
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if (($dsn = @parse_url($params)) === FALSE)
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{
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show_error('Invalid DB Connection String');
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}
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$params = array(
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'dbdriver' => $dsn['scheme'],
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'hostname' => isset($dsn['host']) ? rawurldecode($dsn['host']) : '',
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'port' => isset($dsn['port']) ? rawurldecode($dsn['port']) : '',
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'username' => isset($dsn['user']) ? rawurldecode($dsn['user']) : '',
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'password' => isset($dsn['pass']) ? rawurldecode($dsn['pass']) : '',
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'database' => isset($dsn['path']) ? rawurldecode(substr($dsn['path'], 1)) : ''
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);
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// Were additional config items set?
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if (isset($dsn['query']))
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{
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parse_str($dsn['query'], $extra);
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foreach ($extra as $key => $val)
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{
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if (is_string($val) && in_array(strtoupper($val), array('TRUE', 'FALSE', 'NULL')))
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{
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$val = var_export($val, TRUE);
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}
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$params[$key] = $val;
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}
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}
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}
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// No DB specified yet? Beat them senseless...
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if (empty($params['dbdriver']))
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{
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show_error('You have not selected a database type to connect to.');
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}
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// Load the DB classes. Note: Since the query builder class is optional
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// we need to dynamically create a class that extends proper parent class
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// based on whether we're using the query builder class or not.
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if ($query_builder_override !== NULL)
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{
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$query_builder = $query_builder_override;
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}
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// Backwards compatibility work-around for keeping the
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// $active_record config variable working. Should be
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// removed in v3.1
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elseif ( ! isset($query_builder) && isset($active_record))
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{
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$query_builder = $active_record;
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}
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require_once(BASEPATH.'database/DB_driver.php');
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if ( ! isset($query_builder) OR $query_builder === TRUE)
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{
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require_once(BASEPATH.'database/DB_query_builder.php');
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if ( ! class_exists('CI_DB', FALSE))
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{
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/**
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* CI_DB
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*
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* Acts as an alias for both CI_DB_driver and CI_DB_query_builder.
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*
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* @see CI_DB_query_builder
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* @see CI_DB_driver
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*/
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class CI_DB extends CI_DB_query_builder { }
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}
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}
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elseif ( ! class_exists('CI_DB', FALSE))
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{
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/**
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* @ignore
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*/
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class CI_DB extends CI_DB_driver { }
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}
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// Load the DB driver
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$driver_file = BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_driver.php';
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file_exists($driver_file) OR show_error('Invalid DB driver');
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require_once($driver_file);
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// Load the result classes as well
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require_once(BASEPATH.'database/DB_result.php');
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require_once(BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_result.php');
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// Instantiate the DB adapter
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$driver = 'CI_DB_'.$params['dbdriver'].'_driver';
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$DB = new $driver($params);
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// Check for a subdriver
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if ( ! empty($DB->subdriver))
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{
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$driver_file = BASEPATH.'database/drivers/'.$DB->dbdriver.'/subdrivers/'.$DB->dbdriver.'_'.$DB->subdriver.'_driver.php';
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if (file_exists($driver_file))
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{
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require_once($driver_file);
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$driver = 'CI_DB_'.$DB->dbdriver.'_'.$DB->subdriver.'_driver';
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$DB = new $driver($params);
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}
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}
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$DB->initialize();
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return $DB;
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}
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