dbGetRowsAffected() returns a scalar number (integer or numeric),
the number of rows affected by a data manipulation statement
The value is available directly after the call
and does not change after calling
NA_numeric_ are allowed if the number of rows affected is not known.
For queries issued with
zero is returned before
and after the call to
NA values are not allowed.
Attempting to get the rows affected for a result set cleared with
dbClearResult() gives an error.