Showing posts from January, 2013

Install Yum Extender into CentOS 6

Since Yum Extender is no more maintained in CentOS repository there are a lot of posts asking for this problem and, as usual, a lot of partial or incomplete replies. Just to avoid wasting time follow the few command lines to use for install this tool.

Tree in SQL database: The Nested Set Model

Tree structure are very commonly used by all the application who need to manage a large quantity of data. However once have in memory the tree data the application need a way to save them for future use. SQL database can be a good solution but, in this case, we need a way to store data in efficient mode. This post will propose a model called Nested Set.