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Can I add this "History" field to a record? How to concatenate strings?

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  • Can I add this "History" field to a record? How to concatenate strings?

    Hi Guys,

    Is it possible to as History field of some kind.

    I have a table with a field called status. and I need to keep track of the status changes.

    I was thinking to add a string field that just says "Status was changed to THIS on DATETIME()"
    But then I would need to concatenate another string after the current one when it gets updated again.

    So should I create a function that gets the value from current history control, copies it into a variable, and adds the new string to the back of the old string, and then replaces it into the history field and update and save.

    Does this sound like something that would work? What function can I use to concatenate or combine the strings?

  • #2
    Re: Can I add this "History" field to a record? How to concatenate strings?

    it will depend on the backend to start with and should be a memo type field like text in mysql or memo in alpha.
    it is probably easier to do in the backend itself while updating the status like
    Code:
    if updating the status is successful then
       update the history field set history field + status + datetime() + new line character
    end if
    you could keep the field in the same table or create a history table and keep it separate there.
    if the table is separate then
    Code:
    if update status is successful then
       update the history table set the status field to status field + new value + datetime() + new line character
    end if
    thanks for reading

    gandhi

    version 11 3381 - 4096
    mysql backend
    http://www.alphawebprogramming.blogspot.com
    [email protected]
    Skype:[email protected]
    1 914 924 5171

    Comment


    • #3
      Re: Can I add this "History" field to a record? How to concatenate strings?

      Use another table to collect the history data.
      Al Buchholz
      Bookwood Systems, LTD
      Weekly QReportBuilder Webinars Thursday 1 pm CST

      Occam's Razor - KISS
      Normalize till it hurts - De-normalize till it works.
      Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
      When we triage a problem it is much easier to read sample systems than to read a mind.
      "Make it as simple as possible, but not simpler."
      Albert Einstein

      http://www.iadn.com/images/media/iadn_member.png

      Comment


      • #4
        Re: Can I add this "History" field to a record? How to concatenate strings?

        if you use separate table one other thing to consider,
        the structure of the can be different
        id - will be auto increment
        datetime - time stamp
        field - status field or any other you want to track
        new value - new value
        changed by - user name

        this will give you audit trail
        and a grid may be constructed to show the changes. - with search features you got information that you can tackle anytime with out resorting to break down text field to small manageable list.
        Last edited by GGandhi; 07-04-2016, 09:23 AM.
        thanks for reading

        gandhi

        version 11 3381 - 4096
        mysql backend
        http://www.alphawebprogramming.blogspot.com
        [email protected]
        Skype:[email protected]
        1 914 924 5171

        Comment


        • #5
          Re: Can I add this "History" field to a record? How to concatenate strings?

          Oh wow I see I can set a trigger in mySQL to save records changes to another table like Al said.

          Will something like this work

          TRIGGER `History` BEFORE UPDATE ON `TABLE` FOR EACH ROW BEGIN
          INSERT INTO history SET
          Notes = NEW.Notes,
          Status = NEW.Status;
          END

          Comment


          • #6
            Re: Can I add this "History" field to a record? How to concatenate strings?

            It worked! Thanks a lot guys.

            Comment

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