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Auto Increment

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    #1

    Auto Increment

    Does anyone now how to set a field to auto increment based on the record number order, rather than the active index number order?

    I had a table in V4.5 that I could simply set back to user entered to allow numbers that were 'out of sequence' and of a higher value to be entered, then enter the next number in the original sequence before setting the field back to auto increment, and it would increment from the last record entered irrespective of its value.

    In V5 the current index would appear to be deciding where the sequence begins incrementing from.

    I've looked back through previous threads and found reference to the PREVIOUS() function, but if I leave out the index tag i.e. PREVIOUS(increment,"") focus is given to which ever record I'm viewing when starting a new record.

    Ps Its a character field - example "CR01234"

    Thanks for any suggestions.

    Richard
    Tags: None
    #2
    RE: Auto Increment

    Hi Richard,

    Some things to look at. The Operations tab, there is an Update Records operation and then choose Assign Serial Values. Also, search the board using autoincrement (one word)(as well as the v4 board). I would think that your setup w/v4.5 ought to work because nothing in v5 should have changed that.

    kenn
    TYVM :) kenn

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

    Comment

      #3
      RE: Auto Increment

      Richard,

      check the User Guide for more details, but I think V5 is indexing your table on the auto-increment field, and is using the highest value found in the index list as the value which gets incremented when a new record is entered.

      I recommend you re-think the possibility of using the record number as a basis for assigning unique values to each record. The record number is not a static value. It WILL change for records your table whenever you delete records, and then pack the table or compact the database. These means record numbers would become available for re-use and you'd wind up with duplicate values in your table.

      -- tom

      Comment

        #4
        RE: Auto Increment

        Thanks Ken & Tom,

        The field doesn't use the actual record number for its value, but as the basis for the last record entered to begin incrementing from.

        This way the increment start value can be re-set by manually entering the last record before setting the feild value back to auto increment. I use this feature when recording EAN 13 barcode numbers against product codes - sometimes a customer wants their own barcode used with an own brand product, so the series of numbers is altered for that one record only.

        e.g field values in record number order:
        501713400001
        501713400002
        501713400003
        502940100240 - customer own barcode
        501713400004 - sequence resumes
        501713400005 etc.

        Thanks again.

        Comment

          #5
          RE: Auto Increment

          Richard,

          Sorry, can't offer suggestions. Don't understand the problem. I don't know of a way to disable the autoincrement field rule temporarily using a script, instead of doing it manually from the control panel. Perhaps you'll have to code your own auto-increment script to get this desired flexibility. -- tom

          Comment

            #6
            RE: Auto Increment

            Richard

            It can be done.

            What is the name of the table and field?

            Robert

            Comment

              #7
              RE: Auto Increment

              Richard
              Assuming the table name is "Invoice.dbf" and the field were you keep the number is "Codefield".

              It can be done by creating two new fields.

              A character field, lets say "Characterfield" and a numeric field, lets say "Numberfield"

              The character field for the "CR".

              The numeric field for the "01234"

              Then create a numeric field called LASTRECNO. In this field rules default value enter the following expression:
              tablemax("Invoice.dbf",".t.","Lastrecordno")+1
              This will create a unique incremental field that can be indexed.

              Then create an index based on LASTRECNO, lets say "LRNINDEX"

              In the field rules default value for the "Numberfield" enter the following expression:
              lookupn("F",(maximum(Lastrecordno)),"Numberfield","Invoice.dbf","Lrvindex")+1

              Make "Characterfield" calculated set to "CR"

              Now, make "Codefield" calculated set to TRIM(Characterfield)+You must use of of the PAD?() functions here (STR(Numberfield)

              Make sure you backup your database before you experiment.

              Richard I hope I made myself clear, if not just let me know.

              Robert

              Comment

                #8
                RE: Auto Increment

                Hi Robert,

                Thanks very much for the reply.

                Just read your suggestion and it looks like a winner to me.

                Thanks again & I'll post how I've got on.

                Regards,

                Richard

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