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variable field names

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  • variable field names

    Is it possible to address a field by a variable, as follows


    Or some similar code.

    Thanks for any help

  • #2
    RE: variable field names

    The answer is probably yes. Can you detail the context in which you need to do this: table, form, report?

    Bill Hanigsberg


    • #3
      RE: variable field names

      Hi Ron,

      Yes, it sounds like your are talking about redirection. In A5v4 you might have to use the eval() function to evaluate to the actual field instead of just having a string that contains the name of the field. Just having the name of the field in a character variable doesn't tell Alpha that you want to deal with the field itself, the name is just a character string contained in the variable. The eval() function will 'evaluate' the string to the result of the expression (even if it's just a string).

      Good luck,


      • #4
        RE: variable field names

        Here's a script that allows you to specify the name of a field, then specify it's value. In order to see one possible use, I also included code to change the current record (this script would be run from a button on a form).

        fname=ui_get_text("FIELD NAME","Enter field name")
        fval=ui_get_text("FIELD VALUE","Enter field value")

        Keep in mind that this works for character fields. You would have to change fval to ui_get_number to deal with a numeric field, and ui_get_date for a date field.

        I hope this is what you were looking for.


        • #5
          RE: variable field names


          See my Lotto v4.5 application in the Code section of this BBS. It does exactly that.



          • #6
            RE: variable field names

            Thanks for all the replies.

            As usual a pointer in the the right direction (or redirection) in this case was all that was needed.

            I have now achieved my goal.

            William for your information, I have a large table 440+ field table that is installed in 50+ customer applications, the core fields are the same but there are a few variations on each site.

            I wanted to be able to automate the archiving of data but ran into various problems along the way, calculated fields etc.

            Now I have a function copy_table(source,dest,option) that will create a new table if option is .t., or append to an existing table if option is false. I can filter the source table as requried.

            The key to my problem was catching and ignoring errors when copying to calculated fields.

            Thanks again all