How to keep history of record updates in MySQL?

Question

I have to create a code in PHP that will allow me to keep the history of record updates in MySQL database so I can find by date an old revision.

Here is the example

Answer 1

There is an open source (MIT license) framework to build CRM and ERP type of database driven web applications. You can download EPESI from http://epe.si/ available also on SourceFroge: http://sourceforge.net/projects/epesi/

EPESI's CRUD engine - the Record Browser - has a very efficient record history as well as other features like advanced permission system (down to a field level) and much more.

A single recordset stores data in as many as 10 tables and it is database agnostic (uses PHPAdoDB). A table called recordset_data stores "raw" data and history of changes is stored in 2 additional tables: recordset_edit_history and recordset_edit_history_data.

Record's edit_history has the following structure:

• ID (Primary key for this table, index)
• Edited on (timestamp: 2008-05-14 15:18:15)
• Edited by: (user ID)

Record's edit_history_data has the following structure:

• edit_id = ID from edit history
• field = the name of the field that was changed
• old_value = value of the field that changed.

It is a very fast and efficient engine and it stores changes not on the record but on a single field level.