--- sql2xls.cgi	2008/11/06 10:53:59	24
+++ sql2xls.cgi	2012/12/27 12:57:01	28
@@ -200,7 +200,7 @@
 		my $sth = $dbh->prepare($sql);
 		$sth->execute();
 
-		next unless $sth->{NAME}; # $sth->rows doesn't work for insert into with MySQL
+		next unless $sth->{NAME} && $sth->rows > 0; # $sth->rows alone doesn't work for insert into with MySQL
 
 		my @types = eval {
 			map { $dbh->type_info($_) ? $dbh->type_info($_)->{TYPE_NAME} : '?' } @{ $sth->{TYPE} };
@@ -224,6 +224,7 @@
 					warn "## heuristic date time: $1T$2\n" if $debug;
 					$worksheet->write_date_time( $row, $col, "$1T$2", $date_format );
 				} else {
+					$data = "'" . $data if $data =~ m/^=/; # escape data which looks like formula
 					$worksheet->write($row, $col, _c( $data ) );
 				}
 			}