PowerDesigner establishes a connection with the database in order to generate the database and generate from the database into the PD. [Oracle 10G version]
http://www.cnblogs.com/netsql/archive/2010/05/19/1739491.html
How to perform reverse engineering of databases, such as ORACLE, SQL SERVER, and import the database into PowerDesigner
http://www.cnblogs.com/netsql/archive/2010/05/28/1746522.html