GreenSQL – Open Source Database Security
http://www.greensql.net/

GreenSQL is an Open Source database firewall used to protect databases from SQL injection attacks. GreenSQL works as a reverse proxy and has built in support for MySQL. The logic is based on evaluation of SQL commands using a risk scoring matrix as well as blocking known db administrative commands (DROP, CREATE, etc). GreenSQL is distributed under the GPL license. This has been added to World Wide Web Reference Subject Tracer™ Information Blog. This will be added to Privacy and Security Resources Internet LinkGuide.