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List will not write to SQL

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  • List will not write to SQL

    Hey all

    Over the past year I have been moving an old MS Access front end / back end database onto Alpha and SQL - so I am working with legacy tables that have been uploaded to the SQL Server (Zebra Host) using the MS SQL Migration Tool.

    The original developers used a lot of spaces and even dollar signs in field names - this has caused me a lot of headaches but I have to keep the fields as they are as I have to keep the original MS Access Front End in place while we move the functions over to Alpha.

    One of my tables is called Customer Equipment and I need to be able to add records to it. If I make a UX with a list control and detail section I can scroll through the records and add new records no problem. The file has 35000 + records in it. This list really needs to be a child list to my WORK ORDERS list, linked by a customer number. So I have placed the Equipment List on a second panel, linked it to the Work Orders and it all looks great. I can see the records I want to see but when I go to add a new records I get SQL error saying that it Alpha cannot find the Customer_Number field.

    Why would I see this error when the list is a child on a UX but no when it is the only list on a separate UX? I used the genies to build and bind the controls - so if the genie made the field why can't Alpha find it when it goes to write to the same field? I hope this makes sense.

    I have attached a shot of the error I get.
    2016-12-06_1624.png

  • #2
    Re: List will not write to SQL

    You have a lot of variables going on here. I'd have to see the setup to really give you some help.

    Even though you let Alpha do the work, at this point you need to check the data-bindings of that control for yourself. You might even unbind it then rebind it back again.

    However, I don't completely understand what you are doing. Are you keeping the field and table names the same so it is easier to migrate the data?

    I don't recommend this approach to your programming.

    You would be better off changing the field names in the SQL, then developing an export/import routine to move the data on future tests. The data move will be more of a pain, but your application will be better (and easier to program) in the long wrong.

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    • #3
      Re: List will not write to SQL

      I have to keep the field names and table names the same so that the MS Access front end that is existing still works. We used Alpha to allow mobile access to the data for our field staff and are still using the MS Access - from the 1990's - to do most of the back office tasks.

      If I cleaned up the tables at this point it would cause my front end to not work and shut our operation down...

      My plan was to get the most of the functions working in Alpha as the first version and then go back and optimize the Alpha and data structure as a separate project.

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      • #4
        Re: List will not write to SQL

        I see.

        You migrated to MS SQL, but the front end is still Access, now using the SQL db instead of the Access DB.

        Alpha is just using the DB for a few tasks that are expanding as you go along.

        Depending on what some of your field names actually look like, you are likely going to have some issues in MS SQL.

        However, here are some other things to check:

        Make sure your Primary Key is properly set for each table and that Alpha can see it.

        Make sure your lists are based on Primary Key instead of Field. (They default to field.) This can solve ALL sorts of problems.

        Turn on the ability in your UX to see what alpha is trying to save. Sometimes you can see the problem there.

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        • #5
          Re: List will not write to SQL

          It's really all just guesswork for this type of issue. You only have a couple of tables involved. Copy the tables, structure only, and then add a couple of test records into each. Build your test UX using these tables and confirm the issue is still present. Then post the test UX and a sql export of the test tables. This would take a fraction of the time spent on posting and guessing and responding and guessing. Then you'd have people actually looking at the problem. And... you've not mentioned the Alpha Build you're using or the MS SQL Version.

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          • #6
            Re: List will not write to SQL

            Thanks David and Larry

            I made new files on my SQL server mirroring the ones that were uploaded using the Microsoft Migration Tool. I tested the UX's on the new table definitions and they worked. Then I migrated the data from the original tables into the newly created one and things are working fine now. I am glad to know the problem was with the data and not Alpha.

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            • #7
              Re: List will not write to SQL

              One option regarding the problematic field names is to create SQL views for each table. In the SQL view, use the "Alias" field to rename the problematic field names to whatever is more suitable to your needs or naming conventions. Then use the SQL views in your Alpha components. If you do this, I recommend creating a cross reference doc which will make life easier when debugging any data related issues

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