I have found a data modeling tool to help the work with Mysql.
It's Sql Power Architecthttp://www.sqlpower.ca/page/architect
, a tool that helps the design, project and maintenance of data bases.
And, it has many nice features:
Accesses source databases via JDBC
Connects to multiple source databases concurrently
Compares data models & database structures and identifies discrepancies
Drag-and-drop source tables & columns into the playpen
Remembers the origin of each column
Generates source-to-target visual Mapping Reports
Forward/reverse engineers PostgreSQL, Oracle, MS SQL Server & more
Saves source data structure snapshots in the project, so you can work remotely
All project data is stored in an easy-to-parse XML format
OLAP schema modeling: Cubes, Measures, Dimensions, Hierarchies & Levels
Free Download (Open Source, GPL v.3 licensed) (Community Edition)
Will be in testing soon, so you'll be able to test-drive it.