dbGetRowCount() returns a scalar number (integer or numeric),
the number of rows fetched so far.
the row count is initially zero.
After a call to
dbFetch() without limit,
the row count matches the total number of rows returned.
Fetching a limited number of rows
increases the number of rows by the number of rows returned,
even if fetching past the end of the result set.
For queries with an empty result set,
zero is returned
even after fetching.
For data manipulation statements issued with
zero is returned before
and after calling
Attempting to get the row count for a result set cleared with
dbClearResult() gives an error.