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Referential Integrity - Advise ?

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    Referential Integrity - Advise ?

    I just want to make sure that the setup of this Set is correct;

    (Parent) Invoice_Header
    (Child) Invoice_Items
    Parent Link = INVOICE_NO+CUST_ID
    Child Link = INVOICE_NO+CUST_ID
    Link Type = One To Many
    Referential Integrity = Cascade

    (Child) Customer
    Parent Link = CUST_ID
    Child Link = CUST_ID
    Link Type = One To One (First Match)
    Referential Integrity = Prevent

    My concern is if the INVOICE_NO+CUST_ID Link could cause any problems?

    Also is there any reason that when using expression Links like above, if the Fields in the Parent table and Child table are not in the same order in the table structures, trying to use Referential Integrity gives a error �For integrity, use parent field name�

    Thanks
    Dan
    Daniel Weiss
    EZ Link Software

    #2
    RE: Referential Integrity - Advise ?

    Comment:
    Since an invoice number is unique, I don't see why you'd need to link on invoice number and customer id. Wouldn't invoice number alone yield a unique link. Also, referential integrity only works on single field links.

    Comment


      #3
      RE: Referential Integrity - Advise ?

      Thanks Ohlen

      The reason I am using the Customer Id also is that while entering Items in an Invoice it checks that it dose not exceed the Customers Credit limit, and prevents the user from entering the item line
      Maybe I am wrong and there is a better way?

      Dan
      Daniel Weiss
      EZ Link Software

      Comment


        #4
        RE: Referential Integrity - Advise ?

        Ohlen
        I taught that referential integrity only works on single field links, but in this set layout if I change the customer Id in the invoice header it changes all the attached Items to that customer, it least I think so, do I make any sense?
        Thanks
        Dan
        Daniel Weiss
        EZ Link Software

        Comment


          #5
          RE: Referential Integrity - Advise ?

          I have a field in my Invoice header CID, for the customer ID. You can then access the customer table with lookupn("C",CID,"Credit limit","Cust","CID") assuming cust.dbf is indexed on the CID field, and you have a credit limit field. I actually go one step deeper, by having a Job table - each customer may have multiple jobs. Some are contract, some time and material. I am able to warn people as they do data entry as to what type job they have (Contract jobs are red on white, T&M black on white) as they do data entry.

          Main thing is it lets me link ONLY on invoice number. Very clean. Easy to fix- if the billing gets screwed up, and data is billed to the wrong job if I change the invoice number it automatically goes to the right job (and right customer) This happens as I use "previous" defaults to enter job and date info to speed up data entry. But when I find the error it is fast to fix.

          Steve Williams

          Comment


            #6
            RE: Referential Integrity - Advise ?

            Thanks Steve

            The problem is my client wants to be able to change the customer id in an invoice after entering item to it. He claims the girls make mistakes entering an invoice for the wrong customer
            Dan
            Daniel Weiss
            EZ Link Software

            Comment

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