SchemaSpy 介绍
一个图形化的数据库模型浏览工具,SchemaSpy analyzes database Metadata to reverse engineer
dynamic Entity Relationship (ER) diagrams. It works with just about any JDBC-
compliant database and can identify Ruby on Rails style databases, as well as
other implied relationships.

SchemaSpy 官网
http://schemaspy.sourceforge.net/