Logical Deletes

Question

I'm working on a project with a database where database entries are deleted logically (a column deletets is set to the current time).
How can I handle this with JDO/Kodo?
Requirements:
1. Records with a deletets != null must not be read. Is there a generic way to do this?
2. If the Store Manager decides to remove a record it should not delete the record but send an update set deletets=xx
Thanks for any help

Answer 1

It is dirty but you could try this:
- Map your model onto views which have deleted=false criterion
- Decorate Kodo PM class (and register it in kodo.properties) with delete
methods overrides where you will:
- mark object as logically deleted
- remove any references to it whether N-1 or 1-N, M-N
- Decorate commit method so after commit you inspect all transactional
objects (get them into a list before calling commit) and make all logically
deleted object transient to get them out of your PM
Potential issues are
- you still have them in database so any uniquiness constraints will fire
and you have no way of pre-verifying them
- kodo might clash this filtering view during database flush
- You need to track and remove all references to a logically deleted object
- any other issue I missed :-)
It might give you desired transparency but might cause some subtle problems
down the road
<Laurent Goldsztejn> wrote in message news:[email protected]..
1. Kodo doesn't offer a generic way for updating the boolean type column
instead of deleting the records. This column should be managed and
updated as any generic boolean column.
2. A delete call shouldn't be called there but an update query on the
delete column for the physical delete not to occur.
So the best way is IMHO to manage this column manually (set true or false)
and not use JDO specific method for deletion.
Laurent