DB.php File Reference

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

---

Function Documentation

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

Definition at line 25 of file DB.php.

References $active_group, $active_record, $db, and show_error().

Referenced by CI_Loader::database().

{
        // 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];                   
        }
        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 (($dns = @parse_url($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['path'], 1)) : ''
                                                );
                
                // were additional config items set?
                if (isset($dns['query']))
                {
                        parse_str($dns['query'], $extra);
                        
                        foreach($extra as $key => $val)
                        {
                                // booleans please
                                if (strtoupper($val) == "TRUE")
                                {
                                        $val = TRUE;
                                }
                                elseif (strtoupper($val) == "FALSE")
                                {
                                        $val = FALSE;
                                }
                                
                                $params[$key] = $val;
                        }
                }
        }

        // 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;
}       

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