<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package     CodeIgniter

 * @author      ExpressionEngine Dev Team

 * @copyright   Copyright (c) 2006, EllisLab, Inc.

 * @license     http://codeigniter.com/user_guide/license.html

 * @link        http://codeigniter.com

 * @since       Version 1.0

 * @filesource

 */



// ------------------------------------------------------------------------



/**

 * Initialize the database

 *

 * @category    Database

 * @author      ExpressionEngine Dev Team

 * @link        http://codeigniter.com/user_guide/database/

 */

function &DB($params = '', $active_record_override = FALSE)

{

    // Load the DB config file if a DSN string wasn't passed

    if (is_string($params) AND strpos($params, '://') === FALSE)

    {

        include(APPPATH.'config/database'.EXT);



        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($active_group) OR ! isset($db[$active_group]))

        {

            show_error('You have specified an invalid database connection group.');

        }



        $params = $db[$active_group];

    }

    else if (!is_array($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 (($dns = @parse_url($params)) === FALSE)

        {

            show_error('Invalid DB Connection String');

        }



        $params = array(

                            'dbdriver'  => $dns['scheme'],

                            'hostname'  => (isset($dns['host'])) ? rawurldecode($dns['host']) : '',

                            'username'  => (isset($dns['user'])) ? rawurldecode($dns['user']) : '',

                            'password'  => (isset($dns['pass'])) ? rawurldecode($dns['pass']) : '',

                            'database'  => (isset($dns['path'])) ? rawurldecode(substr($dns['host'], 1)) : ''

                        );

    }



    // No DB specified yet?  Beat them senseless...

    if ( ! isset($params['dbdriver']) OR $params['dbdriver'] == '')

    {

        show_error('You have not selected a database type to connect to.');

    }



    // Load the DB classes.  Note: Since the active record class is optional

    // we need to dynamically create a class that extends proper parent class

    // based on whether we're using the active record class or not.

    // Kudos to Paul for discovering this clever use of eval()



    if ($active_record_override == TRUE)

    {

        $active_record = TRUE;

    }



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



    if (! isset($active_record) OR $active_record == TRUE)

    {

        require_once(BASEPATH.'database/DB_active_rec'.EXT);



        if ( ! class_exists('CI_DB'))

        {

            eval('class CI_DB extends CI_DB_active_record { }');

        }

    }

    else

    {

        if ( ! class_exists('CI_DB'))

        {

            eval('class CI_DB extends CI_DB_driver { }');

        }

    }



    require_once(BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_driver'.EXT);



    // Instantiate the DB adapter

    $driver = 'CI_DB_'.$params['dbdriver'].'_driver';

    $DB =& new $driver($params);



    if ($DB->autoinit == TRUE)

    {

        $DB->initialize();

    }



    return $DB;

}





?>