jeudi 29 novembre 2007
MySQL bulk update with Talend Open Studio
Par Pierrick, jeudi 29 novembre 2007 à 16:44 / categorie: Talend / tags:
3 years ago, I introduced in PhpWebGallery a very fast way to update several lines of the same table, at once. See PhpWebGallery Subversion revision 625 for details. I don't remember how this idea came to me, but I've implemented it as a component in Talend Open Studio. The purpose is to improve speed on mass updates.
The standard way to update several lines of a table, with different values for each line of course, is to perform a query for each line to update. In a web application it is a really bad thing not to know in advance the number of queries for each page. In any other situation, it's not good because it's very slow.
In 
