How to access the database tables from application

Hii all,
The information in webcenter content, such as meta data fields, users, security groups etc are stored in
database tables like- Revisions, SecurityGroups, Users, DocType etc..
Can we access this tables from an adf application or any webcenter application..
If yes, then what can be the approach for that..??
Another things, how can we create custom tables just like the predefined tables...??
Any information regarding this.??
Thanks

Can we access this tables from an adf application or any webcenter application.Yes, you can - like to any other existing database. But I would strongly discourage you from any, but read-only access, or you can easily end up with inconsistent data.
If yes, then what can be the approach for that..??Just create a database connection and define in your model what tables you want to access.
Another things, how can we create custom tables just like the predefined tables...
Actually, WebCenter Content provides functionality of creation of custom tables (see http://docs.oracle.com/cd/E23943_01/doc.1111/e10978/c04_metadata.htm#autoId2 ) and these are probably the only good candidates for read-write access. See further in the manual what use cases are supported. Of course, you could do this even externally, but rather than Data Definition Language, I'd use services (if there are some).

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