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a form based on a set with both one-to-may and one-to-one children

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  • a form based on a set with both one-to-may and one-to-one children

    Hi all,

    My very 1st post, so pardon me if I don't have the vernacular (I'm an old FoxPro programmer. You say 'browse', I say 'grid').

    I have a set with children that are both one-to-many and one-to-one.

    When I build a form with this set, it doesn't work. Depedning on whether the 1st child is a one-to-one or a one-to-many it doesn't work in different ways.

    Before I start fiddling around some more, I just want to be sure that ...
    1) it's ok to have a set with a combination of one-to-one and one-to-many;
    2) the default form is works ok on such a set.

    The set has 5 one-to-many children and 2 one-to-one children. So I just want to be sure I haven't hit some sort of limit of complexity. Or, as is more likely, I'm making some rookie mistake.

  • #2
    Re: a form based on a set with both one-to-may and one-to-one children

    Hi, Richard, and welcome to the message board.

    All data entry in Alpha Five occurs at the table level, not the set level. Set based forms can be a bit confusing at times because Alpha will commit records to disk when focus shifts from fields in one table to fields in another. This happens automatically. This can be hard to detect if your form scatters fields from several tables across the display. Difficulties can occur if data entry is "begun" in a child before the parent is committed to disk, too. See if thinking in terms of data entry through individual tables may explain what you are seeing.

    What type of problems are you seeing?

    I recommend an article at called "Simplify your Applications for better performance" if memory serves. I have learned to use much simpler data entry forms, avoiding the complexities of the set structure you describe.


    • #3
      Re: a form based on a set with both one-to-may and one-to-one children

      Hi Tom,

      I'm trying to make one large display form; no data entry. It seems that if I have nothing but one-to-many children and build a custom form by just dumping everything on the form, it works fine. But if I add a one-to-one child (essentially a lookup), then the data displays, but, I can't navigate off the first record using the next, last buttons in the toolbar.

      I haven't yet got a search form; I'm still playing around.

      I'm using MS SQL.


      • #4
        Re: a form based on a set with both one-to-may and one-to-one children

        Maybe consider making the "lookup table" the primary table with the other two as child tables then you should be able to navigate up and down the lookup table.
        Bob Whitaker


        • #5
          Re: a form based on a set with both one-to-may and one-to-one children

          Using MS SQL? in a set composed of active link tables? My experience (and my comments in this thread) assumed you were using native Alpha Five tables.

          The navigation buttons on the form's toolbar are bound to the primary table in the set supporting your form. So, Bob's idea should give you the navigation you want.


          • #6
            Re: a form based on a set with both one-to-may and one-to-one children

            This is what I figure is happening.
            A one-to-many join is a left join; but a one-to-one is just a join. So if any of my parent records did not have match in my two one-to-one joins, they didn't show up.
            And that looked to me like the navigation was wonky; also because my this was my first form and it was pretty ugly.
            I changed the one-to-ones to one-to-many and now it works fine.
            I was under the impression that if I had a one-to-many, then the data had to show up in a browse. But I can add a text control (type-in field) and bind it to the column in the child cursor.

            Thanks for the assistance and getting me to look at the problem in a different way. I'll be back.


            • #7
              Re: a form based on a set with both one-to-may and one-to-one children

              Hi Richard,

              Please clarify, what do you mean by "It doesn't work"? You say you only want to use the form to view all the data in all the tables connected to the set. The fields in the tables which are joined 1:1, will display in the parent table part of the Drop down Display Field List. Those fields will not display separately as do the fields which are linked 1:M. Try creating a form based on a set and select the Default Form. You will see how the form is constructed. Sometimes I do this when creating a new form and then moce the fields from the Tabbed object to the form itself. Hope this helps. If this is not what you are after, I apologize for not understanding.
              TYVM :) kenn

              Knowing what you can achieve will not become reality until you imagine and explore.


              • #8
                Re: a form based on a set with both one-to-may and one-to-one children


                You do realize you're answering a six month old post?
                There can be only one.


                • #9
                  Re: a form based on a set with both one-to-may and one-to-one children

                  LOL What a hoot. No, I did not. I did a search for an issue I had and it was one of the result? I never paid attention to the date. Time for bed, it's been a long day. As a matter of fact, many long days. Maybe like he said, he'll be back as he didn't say if he figured it out. Hmmm. Maybe no egg on my face after all.
                  TYVM :) kenn

                  Knowing what you can achieve will not become reality until you imagine and explore.


                  • #10
                    Re: a form based on a set with both one-to-may and one-to-one children

                    And then sometimes you just want to chat a bit after a whole day in here searching 5 year old threads...especially when the desktop threads are so infrequent.

                    Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford