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Using Object IDs (OIDs) in Oracle

Oracle Tips by Mike Ault

Creation of a REF Request and REF Passing Method Set

As you can see the actual methods, get_ref and give_ref are quite small and non-complex. To use the methods they are called like normal functions during insert or update operations involving the REFed row in the employees table object or the actual stored REF value in the job_sites table object. By using SCOPEed REF values we can also ensure that any inserted value has a reference value in the parent object (I will show an example later).

It would be great if all we had to think about was insert and update operations, however, there are also delete operations to consider. Gone are the good old days were we could just add a "CASCADE DELETE" to the constraint definition, instead we must add a method to our dependent object to delete these dangling REF objects. The method itself should be called from an after-delete row trigger in the parent object.


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