DBI:
  $rv = $sth->rows;

Returns the number of rows affected by the last row affecting command, or -1 if the number of rows is not known or not available.

Generally, you can only rely on a row count after a non-SELECT execute (for some specific operations like UPDATE and DELETE), or after fetching all the rows of a SELECT statement.

For SELECT statements, it is generally not possible to know how many rows will be returned except by fetching them all. Some drivers will return the number of rows the application has fetched so far, but others may return -1 until all rows have been fetched. So use of the rows method or $DBI::rows with SELECT statements is not recommended.

So it should work to do 
if (! $sth->rows) {
   print "sorry, no matching data"
}

[download]
after the while loop.
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In reply to Re^2: how to determine of fetchrow_Arrayref is empty? by ysth
in thread how to determine of fetchrow_Arrayref is empty? by poolboi

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