Change Database connection at runtime in Codeigniter

Question

I want to connect to a different database based on the sub domain, Currently I\'ve this code, but it not looking a decent solution to the problem. Please guide in right dire

Answer 1

I would personally just run a PDO query in the /application/config/database.php file like this:

Approach #1

prepare($sql);
$sth->execute(array($efg));
$d_result= $sth->fetchAll(PDO::FETCH_ASSOC);

// We are done with PDO for this purpose so free up some resources!
$dbh = null;
unset($dbh);

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = $d_result[0]["DbUsername"];
$db['default']['password'] = $d_result[0]["DbPassword"];
$db['default']['database'] = $d_result[0]["DbName"];
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;


/* End of file database.php */
/* Location: ./application/config/database.php */

Approach #2

$efg="";
$data = explode('.',$_SERVER['SERVER_NAME']);
if (!empty($data[0])) {
    $efg = $data[0];
}

$active_group = $efg; // this will choose from subdomain1/subdomain2 settings below. Add as many as you need
$active_record = TRUE;

$db['subdomain1']['hostname'] = 'localhost';
$db['subdomain1']['username'] = 'subd1User';
$db['subdomain1']['password'] = 'subd1Pass';
$db['subdomain1']['database'] = 'subd1DBName';
$db['subdomain1']['dbdriver'] = 'mysql';
$db['subdomain1']['dbprefix'] = '';
$db['subdomain1']['pconnect'] = FALSE;
$db['subdomain1']['db_debug'] = TRUE;
$db['subdomain1']['cache_on'] = FALSE;
$db['subdomain1']['cachedir'] = '';
$db['subdomain1']['char_set'] = 'utf8';
$db['subdomain1']['dbcollat'] = 'utf8_general_ci';
$db['subdomain1']['swap_pre'] = '';
$db['subdomain1']['autoinit'] = TRUE;
$db['subdomain1']['stricton'] = FALSE;

$db['subdomain2']['hostname'] = 'localhost';
$db['subdomain2']['username'] = 'subd2User';
$db['subdomain2']['password'] = 'subd2Pass';
$db['subdomain2']['database'] = 'subd2DBName';
$db['subdomain2']['dbdriver'] = 'mysql';
$db['subdomain2']['dbprefix'] = '';
$db['subdomain2']['pconnect'] = FALSE;
$db['subdomain2']['db_debug'] = TRUE;
$db['subdomain2']['cache_on'] = FALSE;
$db['subdomain2']['cachedir'] = '';
$db['subdomain2']['char_set'] = 'utf8';
$db['subdomain2']['dbcollat'] = 'utf8_general_ci';
$db['subdomain2']['swap_pre'] = '';
$db['subdomain2']['autoinit'] = TRUE;
$db['subdomain2']['stricton'] = FALSE;