Codeigniter change database config at runtime

Question

Can I change the database config per method in a controller?

$db[\'default\'][\'db_debug\'] = TRUE;

The default is TRUE, while

Answer 1

To hide bad SQL (and other errors) from users, you need to set the php error reporting level. CodeIgniter ships in basically development mode.

Go to index.php and replace this

error_reporting(E_ALL);

with this

error_reporting(0);

This is the quick way to do it. You can also implement this using a hook, so you don't have to touch CI files. You can also add logic to that hook so that it only sets it on the production server.

For debugging SQL, you can create a class that inherits from CI_Model, then create all your model classes to extend that class. In that class, you can add code for running queries that writes the queries to the log so that you can debug them easier. This won't help if the query itself is bad, but you should be able to figure that out before you get to that point.

Answer 2

Expanding on the answer by comenk, you can extend the database class and implement various methods by which to achieve your goal.

First, you'll need to extend the core Loader class by creating a MY_Loader.php file

class MY_Loader extends CI_Loader
{
    function __construct()
    {
        parent::__construct();
    }

    /**
     * Load the Standard and/or Extended Database function & Driver class
     *
     * @access  public
     * @return  string
     */
    function database( $params = '', $return = FALSE, $active_record = NULL )
    {
        $ci =& get_instance();

        if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($ci->db) AND is_object($ci->db))
        {
            return FALSE;
        }

        $my_db      = config_item('subclass_prefix').'DB';
        $my_db_file = APPPATH.'core/'.$my_db.EXT;

        if(file_exists($my_db_file))
        {
            require_once($my_db_file);
        }
        else
        {
            require_once(BASEPATH.'database/DB'.EXT);
        }

        // Load the DB class
        $db =& DB($params, $active_record);

        $my_driver      = config_item('subclass_prefix').'DB_'.$db->dbdriver.'_driver';
        $my_driver_file = APPPATH.'core/'.$my_driver.EXT;

        if(file_exists($my_driver_file))
        {
            require_once($my_driver_file);
            $db = new $my_driver(get_object_vars($db));
        }

        if ($return === TRUE)
        {
            return $db;
        }

        // Initialize the db variable.  Needed to prevent
        // reference errors with some configurations
        $ci->db = '';
        $ci->db = $db;
    }
}

By implementing the above this will allow you to create a MY_DB_mysqli_driver.php whereby mysqli is replaced by whatever driver you're using in your CI database.php config.

At this point you'd add comenk's answer to MY_DB_mysqli_driver.php

function debug_on() {
     return $this->db_debug = TRUE;
}

function debug_off() {
     return $this->db_debug = FALSE;
}

function in_error() {
     return (bool) $this->_error_number();
}

Then in your model/controller,

$this->db->debug_off();

$this->db->query('SELECT * FROM `table`');

if( $this->db->in_error() ) {
    show_404();
}

$this->db->debug_on();

Answer 3

you must add function on system/database/DB_driver.php

function debug_on()
{
     $this->db_debug = TRUE;
     return TRUE;
}

function debug_off()
{
     $this->db_debug = FALSE;
     return FALSE;
}

after that you can simply do this command to changes at run-time

$this->db->debug_off();
$this->db->reconnect();

Answer 4

I checked the code of system/database/DB_Driver and found that:

$this->db->db_debug = FALSE;

will work in my controller to enable/disable the debug thing on the fly.

Answer 5

$this->db->db_debug = 0; // 0: off, 1: on That worx for me... You can look at the $GLOBALS variable to locate this generic setting.