switching database php activerecord

问题

I'm using ActiveRecord and I need switching databases. When I log-in I select a database. The databases are the same schema. I tried:

$connections = array(
   '1' => 'mysql://root:pass@localhost/db1;charset=utf8',
   '2' => 'mysql://root:pass@localhost/db2;charset=utf8',
   'test' => 'mysql://root:password@localhost/database_name'
 );

 $current_db = $_SESSION['db'] ?  $_SESSION['db'] : '2';


 ActiveRecord\Config::initialize(function($cfg) use ($connections, $current_db)
 {
   $cfg->set_model_directory(MODEL_PATH);
   $cfg->set_connections($connections);

   $cfg->set_default_connection($current_db);
 });

db '2' is default. But does not work.

回答1:

I generally use a method like this;

$all = new SomeModel(); // class of ActiveRecord\Model
$all->table()->class->setStaticPropertyValue("connection","test"); //test - defined in cfg
$all->table()->reestablish_connection();
//then use it as usual.
$all_data = $all->all();

回答2:

I found a link with an excellent solution for switching databases here

EDIT: I define a method called switch_connection in my model

   public static function switch_connection($name) {

     $cfg = ActiveRecord\Config::instance();    
     $valid = $cfg->get_connections();
     if ( ! isset($valid[$name])) {
       throw new ActiveRecord\DatabaseException('Invalid connection specified');
     }

     // Get the name of the current connection
     $old = self::$connection;

     $cm = ActiveRecord\ConnectionManager::instance();
     $conn = $cm::get_connection($name);
     static::table()->conn = $conn;

     return $old;
   }

If you see in the link, note that I added the static keyword. I think that is better idea.

来源：https://stackoverflow.com/questions/14055067/switching-database-php-activerecord