Posts tagged extension
One thing that always draws me in tools, libraries and frameworks: what are the hooks, the backdoors, the extension points, the APIs, the event listener registration facilities etc. Today I came across a blog article by Roel Hartman, about showing Oracle Designer objects in the SQL Developer database navigator. I could not resist looking into the extension mechanism used for this. And of course the best way to understand this, is by doing it yourself. So in this article my brief description of how to extend the Database Navigator in JDeveloper (which is the same thing as in stand alone SQL Developer).
My extension is primitive and pointless in the extreme. It has the navigator show a new node type called Employees. The child nodes are the employees specified in table EMP. The interesting part of course is that you can any information found in the database – either the data dictionary or your own tables and views. This allows you to integrate Business Rules if they are defined in tables. Or Tasks, Issues, Projects and Team Members – if they are in tables. Or the results of calling WebServices – if these results are exposed through Views.