Namaste! Thanks Ben!
I just wanted to make sure I wasn't left with "orphans" hanging around that would require later maintenance... To I.Savant: Actually, I am curious to know from the perspective of either the XML type or SQLite type. However, Ben's response provided the needed answer, which is that there isn't anything left hanging around with which to bother. Peace, Love, and Light, /s/ Jon C. Munson II > -----Original Message----- > From: Ben Trumbull [mailto:trumb...@apple.com] > Sent: Monday, February 09, 2009 3:15 PM > To: Jon C. Munson II > Cc: Cocoa Developers > Subject: re: Question regarding nullified relationship objects > > > If I have two entities, A and B, where A <-->>B, and the delete rule > > in > > entity A's relationship to B is cascade, and B's delete rule for the > > relationship to A is nullify, what happens to the actual "row" that > > holds > > the relationship data in A that was once B after B is deleted? Does > > it get > > completely deleted, or is it left as garbage that is later cleaned > > up, or is > > left and later re-filled? > > If you delete B first, it nullifies the inverse, and A remains alive > and well. A will then have NULL for its column referring to B's > table. If you delete A first, it cascades the deletion, and > everything will be deleted. > > > what happens to the actual "row" that holds the relationship data in > > A that was once B after B is deleted? > > The stuff is deleted. Often it's not a row. There might be a join > table, or there might not. "Implementation dependent" For > educational purposes only, if you want to get a better feel of what's > going on, you can use -com.apple.CoreData.SQLDebug 1 as a user > default. I prefer the command line like: > > some.app/Contents/MacOS/some -com.apple.CoreData.SQLDebug 1 > > Unlike .NET, the association tables are not first class objects of > their own, but rather just a property on the source object. > > - Ben > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
