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Using a Filter that is Contained in a Variable

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  • Using a Filter that is Contained in a Variable

    This has to be ridiculously easy, but for the life of me, I can't figure it out. I have a query whereby the filter is contained in a variable. I want to create an append using the same variable as the filter for the append. When trying to fill in the append filter using the variable, it is not a valid filter as it does not evaluate to a logical. How can I extract the text from the variable to be used in the filter? I don't know why I don't know this, and I appreciate your help.

  • #2
    Re: Using a Filter that is Contained in a Variable

    Example? Is the variable dimmed as global so the operation can see it?
    There can be only one.


    • #3
      Re: Using a Filter that is Contained in a Variable

      In the append operation you can click the XY to display the Expression Builder window. In this window is a option on the left hand side for variable. Do you see your variable listed there?

      You may also need to surround the variable with the function s_quote()


      • #4
        Re: Using a Filter that is Contained in a Variable

        The variable is there and it is dim'd as Global.

        As an example...

        = "((custserv=.t. .or. lineserv=.t.) .and. category = var->vcategory .and. (timeentered <= var->vdatestop .and. timeentered >= var->vdatestart))"

        If I just put in var->vparam into the filter editor, the result shows the contents of the variable but then throws the error that "Filter must evaluate to a logical expression"

        Now looking over this, I see that I have other variables that might be only form based, which could be the issue, but I am not sure (In the Interactive Code Editor, the variables all have a value so I don't think this is an issue).

        What I am doing is filtering a table using a form with variables on it. I then query the table with a concatenated filter based on what filters were or were not selected. I then want to append whatever records are queried to another table. I was going to use the current query filter to do that in the above manner. Perhaps there is an easier way?


        • #5
          Re: Using a Filter that is Contained in a Variable

          I don't think the expression builder is going to resolve the filter variable for the append as anything but a character expression. The genie just isn't built that way.

          You can capture the xbasic for the append and modify it like

          dim global filt as C
          filt = quote("amt < 13")

          'early part of append operation code

          append.t_filter = unquote(var->filt)

          'rest of code

          If that's the kind of thing you mean by passing the filter as a variable.

          You should be able to capture the xbasic for your append (no filter) and change the transaction filter lne to

          append.t_filter = unquote(var->vparam)
          There can be only one.


          • #6
            Re: Using a Filter that is Contained in a Variable

            try this... however not sure it will work. I am thinking that when you run ?vparam it should have already converted the variables to their actual data value.
            = "((custserv=.t. .or. lineserv=.t.) .and. category = s_quote(var->vcategory) .and. (timeentered <= s_quote(var->vdatestop) .and. timeentered >= s_quote(var->vdatestart)))"
            *Dang Stan is quick


            • #7
              Re: Using a Filter that is Contained in a Variable

              Open a form or browse and build the filter you want in a query - menu - query - query by expression. and then save the query.

              Using the interactive window is not the way to go for this process.

              Use what you have without the quotes around it as the filter for the query.
              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



              • #8
                Re: Using a Filter that is Contained in a Variable

                To be entirely "proper" I think the filter should be..

                "((custserv .or. lineserv) .and. category = "+s_quote(var->vcategory)+" .and. (timeentered <= "+s_quote(var->vdatestop)+" .and. timeentered >= "+s_quote(var->vdatestart)+"))"
                Testing a logical variable = .T. or .F. is somewhat redundant. A logical variable simply is .T. or .F..
                There can be only one.