Welcome to coolkeums.org

You will find here my geek stuff mainly around web development and free software but not only. This site is a home made tag oriented CMS, all pages except content ones are tag search results also available in RSS. This way you can choose what you do want to browse in this mess. Use the "search" button above or click one tag in results below. Enjoy !

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Pomm: a concerto for PHP and Postgresql

Posted by greg on February 29, 2012 3:36 PM Tags : geek computing postgresql dev php pomm

The weather website.

You can find the git archive of this tutorial on github.

After we did a discover of…

Your queries will never be the same again

Posted by greg on February 17, 2012 5:07 PM Tags : geek computing postgresql dev php pomm

It took me months not to say years to figure out. I was first frustrated because ORMs did not let me use the cool features in Postgresql like types and operators, this is why I made…

PHP function arguments by reference

Posted by greg on February 1, 2012 8:35 AM Tags : geek computing dev php

A short article on PHP function arguments

Everyone knows since PHP5, objects are passed by reference to the functions and methods. That mean modifying an object in a function …

A gentle introduction to Pomm

Posted by greg on January 27, 2012 3:21 PM Tags : geek computing postgresql dev php pomm

h2. Writing PHP application with Postgresql: Pomm

It has been a long time since I wrote an article on my blog. Well, lot of things have changed in my life last couple of month and …

Using VALUES in SQL queries

Posted by greg on August 31, 2011 2:34 PM Tags : geek computing postgresql

The power of VALUES

VALUES is a very useful SQL statement that can make very efficient queries. In fact, as soon as you write a bit of SQL, you use VALUES ... in the INSERT statement….

Internet et l'ère de la junk-news

Posted by greg on August 31, 2011 9:34 AM Tags : geek

J’attrape mon clavier aujourd’hui car je suis excédé par un phénomène qui n’est en plus pas prêt de s’arrêter, à savoir internet et le délire de l’information. Je vais tâcher de présenter …

Velibs, Pomm and Silex

Posted by greg on July 11, 2011 2:41 PM Tags : geek computing postgresql dev php silex pomm

Pomm + Silex + Velibs

I want to ride my bicycle

Paris has changed since the apparition of Velib’s stations. Wherever you are, there is a velib station near you where you …

Few words about Postgresql's window functions

Posted by greg on June 30, 2011 6:44 PM Tags : geek computing postgresql

Ranking

Understanding the principle of window functions is easy as soon as you realize it has to do with rankings. Let’s take a practical example:

CREATE ...

Pomm's website is out

Posted by greg on June 14, 2011 11:09 AM Tags : geek computing postgresql dev php pomm

The pomm’s website is born. It includes Pomm‘s documentation and download page. Of course, Silex extension and Sf2 bundle have not been forgotten. ...

Super valve common grid for DACs

Posted by greg on May 9, 2011 4:25 PM Tags : geek electronic valve amplifier

Original goal

I had a previous experience building a 6N8S powered pre-amp. I took directly the signal after the opamp of an enter level CD player (I don’t even remember the brandt)...