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Has Relationship support for grids or dialogs

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    #1

    Has Relationship support for grids or dialogs

    Could anyone please tell me how to support a many to many has relationship like the one attached, and to what level (grid, dialog, etc...).

    has_relationship.png

    Thanks,
    Juan Silva
    Last edited by jmsilva; 05-20-2012, 07:23 PM.
    Juan Silva
    My Small Bizz, LLC
    sigpic
    Tags: None
    #2
    Re: Has Relationship support for grids or dialogs

    Hi Juan,

    Is this for data input or search and display?
    Regards
    Keith Hubert
    Alpha Guild Member
    London.
    KHDB Management Systems
    Skype = keith.hubert


    For your day-to-day Needs, you Need an Alpha Database!

    Comment

      #3
      Re: Has Relationship support for grids or dialogs

      Hi Keith,

      All IO, input, search, update and delete. Once you commit to a design of "has relationship" you must be able to support all of then (the attached EER is only a small section of my design, there are many other tables referencing the address table (like customer and vendor) and other tables besides address with a "has relationship" ), but now that I think about it, what we need is dialog support (grids don't support transaction IO), thought it be nice for grids to have that support as well, but remember that with-out a begin transaction and commit transaction the design would be a very risky proposition.

      This type of table design needs the out most data integrity or we might have a big nightmare, errand address records and others, would be impossible to match back to their parent record.


      Thanks,
      Juan Silva
      My Small Bizz, LLC
      Altamonte Springs, FL
      Skype = juan.m.silva1
      Juan Silva
      My Small Bizz, LLC
      sigpic

      Comment

        #4
        Re: Has Relationship support for grids or dialogs

        Hi Juan,

        The reason I asked, how you wanted to use the structure in your image was that most of this would be done as lookups. That way the integrity of the data would be maintained, thereby eliminating the "big nightmare". Not quite sure from your diagram where the M:M relationship is. Can a member have more than one address? Or, can a Member not have an address? Why cant the data from Member and Store be in the same table? Or if they need to be in separate tables, the link would be 1:1. What is Store_has_address? Can a Store exist without an address?

        Sorry for so many questions, what you have presented and asked for help with, is a little out of context as to how you want to work with the tables.
        Regards
        Keith Hubert
        Alpha Guild Member
        London.
        KHDB Management Systems
        Skype = keith.hubert


        For your day-to-day Needs, you Need an Alpha Database!

        Comment

          #5
          Re: Has Relationship support for grids or dialogs

          Not a problem Keith,

          Member and store tables must have at least 1 address as represented by ( 1 to 1...) in the EER into the intermediate tables (has relationship tables) and every "has" table has a many to 1 address record relationship with the address table. The member and the store tables can also have many addresses.

          I could have a member_address table and a separate store_address table in the design, but that would defeat the OO design purpose making me create and maintain 4 distinct address tables, I will go the other way if need be, but just like to make sure I have exhausted all my possibilities.

          By the way, if no records are inserted, there would be no lookups...

          Thanks,
          Juan
          Last edited by jmsilva; 05-21-2012, 10:55 AM.
          Juan Silva
          My Small Bizz, LLC
          sigpic

          Comment

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