ZF-49: Zend_DB_Adapter_Abstract should has a function like checkConnection()
In a production enviroment it's often necessary to check if a connection was established successfully before any queries are sent to the database (e.g. switching to another slave if one server is down).
Because the PDO-Connection is only created on the first real query, there should
a) be a new method called "checkConnection" which creates the PDO-Connection and throws an Exception if something fails or b) the connection should be established in the constructor (who should create the DB object if he doesn't need it)?