MySQL is the most widely used open source database.
Widenius launched his appeal a day ago. He has asked those who want "save MyQL from Oracle's clutches" to write to the European Commission and "help secure the future development of the product MySQL as an Open Source project."
MySQL was founded by Widenius, David Axmark and Allan Larsson in 1995. The company was sold to Sun in 2008 and Widenius joined Sun, only to leave in February this year. In April, Oracle acquired Sun.
The EU launched its investigation last month and has to reach a decision by January 19.
Widenius, who has already forked the MySQL code into a project called MariaDB, is of the opinion that MySQL will not continue to be a competitive force if Oracle owns it, as it is a direct competitor with Oracle.