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deleting records

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  • deleting records

    I'm new to Alpha and Xbasic and I have a question regarding deleting records in a table. I have a loop similiar to the following:

    xi = tbl.query_create()
    tbl.fetch_first()
    while .not. tbl.fetch_eof()
    if tbl.empno = v.empno
    'do something
    end if
    tbl.fetch_next()
    end while
    tbl.close()

    but I want to delete individual records as I go. Can someone tell me the syntax to do that? Many thanks.

  • #2
    Re: deleting records

    tbl.delete()
    There can be only one.

    Comment


    • #3
      Re: deleting records

      Don, as always check the help file documentation before using a new function or method. In this case the <tbl>.delete() method contains a very important note:

      Note : When you delete a record, Alpha Five automatically fetches the next record.
      If your script fetches the next record after deleting a record you wind up skipping records because the sequence becomes:

      delete
      automatic fetch next
      scripted fetch next
      delete
      automatic fetch next
      scripted fetch next
      etc

      Comment


      • #4
        Re: deleting records

        I have to delete records from a grid. Can the tbl.delete be used in an xbasic callback to delete records in a grid? I know there is a javascript method of doing this, but I need to disable the delete button under a condition (if the user tries to withdraw from class less than 2 days before it starts) and I know how to do this in xbasic, but not in javascript.

        Thank you,

        --Rob

        Comment


        • #5
          Re: deleting records

          If your grid is in a web based application then it would seem to be more appropriate to post in a web application section of the message board.
          There can be only one.

          Comment


          • #6
            Re: deleting records

            Right.

            Thank you, Stan.

            -Rob

            Comment


            • #7
              Re: deleting records

              Stan,

              I moved my question to the proper forum; thanks for the tip. Any thoughts on deleting from a grid w/xbaisc? Can the code above this post work as an ajax callback from a grid?

              Thank you,

              --Rob

              Comment


              • #8
                Re: deleting records

                No thoughts on grids at all. Don't use them.
                There can be only one.

                Comment


                • #9
                  Re: deleting records

                  Yes you would do that using a button on a grid firing a Callback. The process gives you sample code including how to identify the current record (different for DBF vs SQL), which you can then use to delete that particular record. You might need to refresh the grid after the callback to remove the record from view.
                  Steve Wood
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