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Can't locate object method "row" via package "DBI::st" error !

by dtharby (Acolyte)
on Jun 09, 2005 at 08:21 UTC ( [id://465003]=perlquestion: print w/replies, xml ) Need Help??

dtharby has asked for the wisdom of the Perl Monks concerning the following question:

I have got the following in my code :-

...... if ($sth->row ==0) { print "No rows matched criteria\n"; }

The line if... is causing the error as stated. can anyone help me ??

Replies are listed 'Best First'.
Re: Can't locate object method "row" via package "DBI::st" error !
by robartes (Priest) on Jun 09, 2005 at 08:28 UTC

    Could you include the code that initialises $sth. Chances are the cause of the error is to be found there.

    CU
    Robartes-

      Sure, should have down so from the start
      use DBI; $DSN='.....'; $dbh = DBI->connect("dbi:ODBC:$DSN") or die "$DBI::errstr\n"; my $sth = $dbh->prepare('SELECT * FROM Test WHERE ServerName = ?') or die "Couldn't Prepare statement: " . $dbh->errstr; print "Enter ServerName> "; while ($ServerName = <>) { my @data; chomp $ServerName; $sth->execute($ServerName); # Read the matching records and print out while (@data = $sth->fetchrow_array()) { my $ServerType = $data[1]; my $WeekDays = $data[5]; print "\t$ServerType $ServerName $WeekDays\n"; } if ($sth->row == 0) { print "No servers matched \n\n"; } $sth->finish; print"\n"; print "Enter ServerName> "; } $dbh->disconnect;
      thanks

        There is no method row on the statement handle - there is rows which I think is what you want instead.

        /J\

        Be aware that $sth->rows returns sensible results only when used with row-affecting SQL statements.

        Check the DBI docs:

        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.

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