use MaintainableDBConnRef;
use DBError;
use DBAccessError;
-use DBMasterPos;
use DBTransactionError;
use DBExpectedError;
use Exception;
* Index must be an actual index into the array.
* If the server is already open, returns it.
*
- * On error, returns false, and the connection which caused the
- * error will be available via $this->mErrorConnection.
- *
* @note If disable() was called on this LoadBalancer, this method will throw a DBAccessError.
*
* @param int $i Server index or DB_MASTER/DB_REPLICA