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Deleting "children"

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    Deleting "children"

    I'm sure there must be something on the forum already about this, but I don't quite know what I'm looking for.

    I have a primary table in a set, from which I want to delete a record. I've set this up the easy way by simply draging a button onto the form and letting the wizard do the work. Trouble is, it deletes my primary record OK but it's deleting the linked child record as well (which is, or can be, linked to other primary records). How do I delete my, for example, Invoice line without deleting the corresponding Customer record? I've only just noticed this - but I don't think I've changed anything in this area...

    Martin.

    #2
    RE: Deleting

    Martin,

    In the definition of the set did you specify referential integrity ?

    Are you seeing the problem only when a child table record has focus?

    Why do you have child records that are linked to more than one parent table record?

    -- tom

    Comment


      #3
      RE: Deleting 'children'

      Hi Tom,

      Displaying my ignorance, here, but I should be used to that by now:

      >>In the definition of the set did you specify referential integrity?

      Don't know - how do I check?

      >>Are you seeing the problem only when a child table record has focus?

      No.

      >>Why do you have child records that are linked to more than one parent table record?

      Well, perhaps I should have simply said "linked table". For example, the view of an invoice (primary table) could contain the customer's name and address, taken from another, e.g. "customer.dbf", table. If I delete the invoice, A5 is deleting the customer's record, too. Obviously, the same customer would/could be linked to many invoices (or orders, or whatever).

      Don't know if this helps.

      Thanks,

      Martin.

      Comment


        #4
        RE: Deleting 'children'


        Edit the set, examine it's link properties. there are checkboxes available to set referential integrity on or off. I'll wager you have NOT set referential integrity since all linked child table records are not being deleted.
        So don't spend much time on it.

        There's a world of difference between a parent table record which is linked to lots of child table records; and a child table that's linked to lots of parent table records. I understood you to mean the latter, and that would be very, very odd.

        I suggest you follow the ususal drill. Post a working model of the problem database here for us to see. Include instructions on how to replicate the issue.

        -- tom

        Comment


          #5
          RE: Deleting 'children'

          Thanks, Tom,

          It WAS the referential integrity - I had one of my "child" tables set to Cascade changes/deletes. I don't know why - all the other tables in the set were OK - must have been working late one night!

          Thanks again, I'll know next time...

          Martin.

          Comment


            #6
            RE: Deleting

            When you use the Referential Integrity with cascading change/delete, do you experience a time factor in deleting the records?

            Comment


              #7
              RE: Deleting

              What do you mean "time factor"? A delay in deleting?

              Comment


                #8
                RE: Deleting

                Yes.
                I have a set and one of my children has a Ref Integrity with Cascading/Delete option. We wanted when we delete a parent record it will also reflect on the child. We used to do this on Alpha 4 and it would only take a moment to delete a record. But when we migrated to Alpha 5, we noticed that it is taking forever to delete just 1 record (approx >30mins). We are wondering if anyone has encountered the same scenario. We need to delete a lot of records and its taking more than 30 mins. just to finish a record.
                Any help is appreciated.

                Comment


                  #9
                  RE: Deleting

                  When a record is deleted it is not removed from the file - a flag is set so it does not get used. Handy if you or someone else screws up and deletes data by mistake. It can be recovered.

                  If you have a lot of deleted records the file might be large, and you may need to physically recover the space.

                  This is done by "packing" the table - the file is rebuilt leaving out all the deleted records. It will then run faster.

                  If you are running over a network it may be a network optimisation issue (I am not good at these issues - just aware of the possibility)

                  Comment

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