Using Multiple Database Connection Not Working For Extension - yii-extensions

Question

I am doing multiple database connection using the tutorial at http://www.yiiframework.com/wiki/544/multiple-database-connection-select-database-based-on-login-user-id-dynamic/ . The code is working fine in the model. But the problem is I am using an extension where I am using db connection using Yii::app()->db; Here I am getting exception Property "CWebApplication.dbadvert" is not defined. The controller of the extension is extended from CExtController. Please help.

Answer 1

In the example you're referring dbadvert is set up for custom active record class RActiveRecord, not for the web application.
If you want to use it like Yii::app()->dbadvert, you would need to set it up in components section of your config.php like this
'dbadvert' => array(
'class' => 'CDbConnection'
*params here*
),
UPD
You can create a wrapper component for CDbConnection, that will change the connection string any way you want and put in as a webapp component.
<?php
class CMultiuserDatabaseConnection extends CApplicationComponent {
public function __call($name, $params) {
$db = $this->db;
return call_user_func_array(($db, $name), $params);
}
public $dbConnectionClass = 'CDbConnection';
public $connections = null;
public $defaultConfiguration = null;
public function getDatabaseConfiguration($user) {
if (!$this->connections) { return array(); }
return array_key_exists($user, $this->connections) ? $this->connections[$user] : $this->defaultConfiguration;
}
public function getDb() {
$user = Yii::app()->user;
if ($user->isGuest) { return false; }
$username = $user->name;
$config = $this->getDatabaseConfiguration($username);
if (!$config) { return false; }
$dsn = array_key_exists('dsn', $config) ? $config['dsn'] : null;
if (!$dsn) { return false; }
$user = array_key_exists('user', $config) ? $config['user'] : null;
$password = array_key_exists('password', $config) ? $config['password'] : null;
$result = new $this->dbConnectionClass($dsn, $user, $password);
return $result;
}
}
That's a crude example of component, which you can set up as your 'db' component and then you'll get 'connections' option for storing the per-user configuration in that way:
'components' => array(
...
'db' => array(
'class' => "CMultiuserDatabaseConnection",
'connections' => array(
"first-user-name" => array(
// just another db configuration here, for user-one
),
"second-user-name" => array(
// just another db configuration herer, for user two
),
...
),
'defaultConfiguration' => array(
/*
* here goes configuration for all other user, that were not specified
* in connections.
*/
),
),
...
),

Answer 2

I wrote the query for the extension in a model as functions. and in the CExtController created an instance of the model. Then I called those functions and everything is working fine.