Before you develop your software using MySQL Database please take look about MySQL License
For OEMs, ISVs, VARs and Other Distributors of Commercial Applications:
OEMs (Original Equipment Manufacturers), ISVs (Independent Software Vendors), VARs (Value Added Resellers) and other distributors that combine and distribute commercially licensed software with MySQL software and do not wish to distribute the source code for the commercially licensed software under version 2 of the GNU General Public License (the “GPL”) must enter into a commercial license agreement with Oracle.
detail is in this link :
http://www.mysql.com/about/legal/licensing/oem/
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100% Compatible MySQL