posted 11 years ago
Eclipse itself doesn't talk to databases. So you don't set up "Oracle connections in Eclipse". The database connections have to be made by the projects that talk to databases.
If you have a database support plug-in that allows you to browse and manipulate database data and schemas, that plug-in would typically have its own mechanism for defining the connections to the databases it allowed you to browse and manipulate, but the exact process would depend on what database plug-in you're using. There's no universal definition.
Sometimes the only way things ever got fixed is because people became uncomfortable.