flot: Javascript plotting for jQuery

Florian — Sat, 23 Jan 2010 07:50:54 +0000

When eye-candy and function meet, you get perfection. Now add ease of use and offloading of a few CPU cycles to the client and you get flot. It’s a JavaScript library for jQuery that creates beautiful diagrams from your raw data… just like that. It just works.

Take a look at this… awesome!

This picture was generated from data collected from plain text logfiles inserted into MySQL using Perl, queried using Python/SQLAlchemy, served using a Python/WSGI application through SCGI using flup and Apache2 and plotted using JavaScript on Mozilla Firefox… and I get paid to do that!

Perl: Net::MySQL affected_rows_length

Florian — Sun, 10 Jan 2010 02:21:25 +0000

I just came across this minor issue in the pure Perl MySQL module Net::MySQL. There are a few open bugs, not much activity on the bug-tracker so who knows if this gets fixed — submitted it anyway.

Assuming an error like 1452 happened after a successful insert statement that inserted eg. 1 row. If you now use get_affected_rows_length, you still get 1 instead of 0. You should get 0, as the last executed query did affect 0 rows, because of a foreign key constraint.

The fix is easy — just set affected_rows_length to 0 in _reset_status():

Index: Net/MySQL.pm
===================================================================
--- Net/MySQL.pm	(revision 1)
+++ Net/MySQL.pm	(working copy)
@@ -449,6 +449,7 @@
 	$self->{server_message}  = '';
 	$self->{error_code}      = undef;
 	$self->{selected_record} = undef;
+	$self->{affected_rows_length} = 0;
 }

florian.demmer.org » perl

flot: Javascript plotting for jQuery

Perl: Net::MySQL affected_rows_length