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Blank records when using a Active link set

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    #1

    Blank records when using a Active link set

    I have linked three tables together using Active link from SQL Server 2005. The relations seem to work fine but when I run the default browse there are several strange issues. The first is that starting with the second Parent record a phantom child record is added that has no data and no link ID. This phantom record appears under each subsequent parent record which means I get a blank row in my child records on reports, etc. The second strange anomaly is that I cannot scroll through the browse or use the navigation keys to move between records. I can only navigate about three records down and then it seems to just stop responding. If I jump to the end of the table I do see the rest of the records. Also, when I do this the blank records disappear from the prior Parent records. All a little disconcerting if I want to use Alpha to front-end a SQL database.
    Brad Weaver, President
    ComputerAid International
    Ottawa ON Canada
    Versailles KY USA
    www.compuaid.com
    Tags: None
    #2
    Re: Blank records when using a Active link set

    Hi Brad,

    What actually is your question apart from being a " little disconcerned"?
    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: Blank records when using a Active link set

      Keith:

      The question is "Why does Alpha return blank child rows when using a set to relate Active Link tables, when it works fine with Passive Link tables?" Also, why does the default browse not allow you to navigate through the results when linking multiple Active Link tables in a set? Sorry if I didn't make those two questions clear and I hope that I've explained this a little better now.

      Thanks!
      Brad Weaver, President
      ComputerAid International
      Ottawa ON Canada
      Versailles KY USA
      www.compuaid.com

      Comment

        #4
        Re: Blank records when using a Active link set

        I've done some further research on this and it appears that on first matching child record of the Active Link tables is not being included in the results. Attached are two screen shots of identical Sets, one defined using Passive Link tables (on the left) and the other using Active Link tables. Notice that on the report on the right the first child record (products) line is blank where it should be showing Aniseed Syrup (reference the report on the left.) I've forwarded this information to Selwyn as a reproducible bug. I've further discovered that using the Default Browse that the first child record shows up without data in the grid until you edit the parent on the same row and then the child record displays the correct information.
        Last edited by compuaid; 10-06-2009, 02:34 PM. Reason: Further explanation and clarification
        Brad Weaver, President
        ComputerAid International
        Ottawa ON Canada
        Versailles KY USA
        www.compuaid.com

        Comment

          #5
          Re: Blank records when using a Active link set

          Did you try a direct connection string to your SQl tables instead of using active / passive tables?

          I use Alpha V10 directly connected with the oracle SQL backend. Did not have the problems you are describing..

          Only reason I can think of using passive link tables is that you want to report on a fixed state (f.i. month end) of your tables to be sure they do not interfere with data of the new month...

          Never understood the concept of active link tables...Why would you want to duplicate data across SQL to DBF platforms..Other than dealing with performance issues because of the connection.. With V10 this should not be an issue so much..

          To be honest: In my opinion active and passive tables are a concept which does not make sense. Or not anymore.

          Make a choice to use either DBF or SQL DB as your DB backend. But always directly.

          Active / Passive link tables is a concept I never saw in any other development system before.
          But i can understand the reasons why before..
          But now with V10 I think they should be made obsolete.

          What do others think?
          Last edited by rleunis; 10-06-2009, 05:21 PM.

          Comment

            #6
            Re: Blank records when using a Active link set

            Maybe it's being so new to Alpha but how would I go about creating forms and reports using a "direct" connection to tables and maintain referential integrity without using Active Links? I consider Active Links to BE direct connections to tables using OLEDB, SQL Native clients or ODBC. Can you give an example of how to circumvent this method and deal with the tables another way?
            Brad Weaver, President
            ComputerAid International
            Ottawa ON Canada
            Versailles KY USA
            www.compuaid.com

            Comment

              #7
              Re: Blank records when using a Active link set

              Originally posted by compuaid View Post
              Maybe it's being so new to Alpha but how would I go about creating forms and reports using a "direct" connection to tables and maintain referential integrity without using Active Links? I consider Active Links to BE direct connections to tables using OLEDB, SQL Native clients or ODBC. Can you give an example of how to circumvent this method and deal with the tables another way?
              Reports you can and have been since v9 but I was not aware that forms could also be created this way?

              Comment

                #8
                Re: Blank records when using a Active link set

                Ooooops !

                I have to apology big time here for my previous entry in this thread...
                I thought i was in the web forum again...

                I haven't been using the desktop features since version 7...

                I must have assumed that since you can base your reports and web grids on direct sql connections this was also possible for desktop forms.

                Apparently it is not (yet). I think it should be made possible though..
                Active link tables is the way to go here.

                Sorry again. I'll pay better attention and double check first in future.

                Regards Ron (deeply ashamed..)

                Comment

                  #9
                  Re: Blank records when using a Active link set

                  Punishment: One thousand lashes with a wet noodle.;)
                  Tim Kiebert
                  Eagle Creek Citrus
                  A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.

                  Comment

                    #10
                    Re: Blank records when using a Active link set

                    Originally posted by Tim Kiebert View Post
                    Punishment: One thousand lashes with a wet noodle.;)
                    Wow I want to know what brand of noodle can withstand that! ;)

                    Comment

                      #11
                      Re: Blank records when using a Active link set

                      Originally posted by rleunis View Post
                      Ooooops !

                      I have to apology big time here for my previous entry in this thread...
                      I thought i was in the web forum again...

                      I haven't been using the desktop features since version 7...

                      I must have assumed that since you can base your reports and web grids on direct sql connections this was also possible for desktop forms.

                      Apparently it is not (yet). I think it should be made possible though..
                      Active link tables is the way to go here.

                      Sorry again. I'll pay better attention and double check first in future.

                      Regards Ron (deeply ashamed..)
                      Ron,

                      What web forum ? I noticed other users referring to it also but I don't see a specific Web forum. What do you mean exactly ?

                      Thx
                      Frank

                      Tell me and I'll forget; show me and I may remember; involve me and I'll understand

                      Comment

                        #12
                        Re: Blank records when using a Active link set

                        Frank,
                        One way to get to other forums...
                        Below this thread you will see on the right hand side a drop-down list called "Forum Jump". Click on it and you will see "Application Server version 10" as a choice.
                        Mike
                        __________________________________________
                        It is only when we forget all our learning that we begin to know.
                        It's not what you look at that matters, it's what you see.
                        Henry David Thoreau
                        __________________________________________



                        Comment

                          #13
                          Re: Blank records when using a Active link set

                          Frank:

                          As Mike points out, the Application Server forums are somewhat synonymous with "Web Forums" since Alpha programs deployed as web pages are deployed using the Application Server. At the top of the page you can go to the Alpha Software Message Board link and then go to the Application Server forums.
                          Brad Weaver, President
                          ComputerAid International
                          Ottawa ON Canada
                          Versailles KY USA
                          www.compuaid.com

                          Comment

                            #14
                            Re: Blank records when using a Active link set

                            I don't know about sql or other backends, but I was working with a client who was connecting to an Access database with about 15,000 records and we had to set it to read only - otherwise the time was really long, and would often error out, likely a time out issue - like more than 20 minutes.

                            If we set it to read only it was acceptable.
                            Cole Custom Programming - Terrell, Texas
                            972 524 8714
                            [email protected]

                            ____________________
                            "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

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