// Common error typesvar (ErrNotSupported=errors.New("pq: Unsupported command")ErrInFailedTransaction=errors.New("pq: Could not complete operation in a failed transaction")ErrSSLNotSupported=errors.New("pq: SSL is not enabled on the server")ErrSSLKeyUnknownOwnership=errors.New("pq: Could not get owner information for private key, may not be properly protected")ErrSSLKeyHasWorldPermissions=errors.New("pq: Private key has world access. Permissions should be u=rw,g=r (0640) if owned by root, or u=rw (0600), or less")ErrCouldNotDetectUsername=errors.New("pq: Could not detect default username. Please provide one explicitly")errUnexpectedReady=errors.New("unexpected ReadyForQuery")errNoRowsAffected=errors.New("no RowsAffected available after the empty statement")errNoLastInsertID=errors.New("no LastInsertId available after the empty statement"))