ZF-2235: Zend_Db_Adapter_Oracle - Support charset option
We can't change the charset of the connection between ZF and Oracle.
the oci_connect() function gets a $charset param but we can't define it with Zend_Db::factory. The problem is located in the method _connect() in Zend_Db_Adapter_Oracle
(from the php doc : resource oci_connect ( string $username, string $password [, string $db [, string $charset [, int $session_mode]]] ) )