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Query Filter - Expression for Variable Charactor

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    Query Filter - Expression for Variable Charactor


    How do you write for Variable charactor expression?
    The vMailId is a variable and referenced for charactor type.

    query.filter="flattenquery("+"mailhd_id=[SIZE="5"][B][COLOR="Red"]'"+vMailID+"'[/COLOR][/B][/SIZE]) .and. (Mail_List->Reprint=.T."+")"

    Re: Query Filter - Expression for Variable Charactor

    You have me a little stumped as to what you are doing and can only give one possible help until more is known.

    If you are comparing a field with a variable, it is helpful to alltrim(var->variablename). I have even gone so far as to alltrim() the field also.

    Others may pick right up on your desire.

    Dave Mason
    [email protected]
    Skype is dave.mason46


      Re: Query Filter - Expression for Variable Charactor

      I don't have Alpha up right now but try

      query.filter="flattenquery(\"mailhd_id='"+vMailID+"' .and. (Mail_List->Reprint=.T.)\")"
      There can be only one.


        Re: Query Filter - Expression for Variable Charactor

        Ok. Flattenquery() requires that you supply a character filter expression and query.filter requires a quoted filter string so if you start with

        vMailID = "ABC"
        ? "(mailhd_id = '"+vMailID+"') .and. (Mail_List->Reprint=.T.)"
        = "(mailhd_id = 'ABC') .and. (Mail_List->Reprint=.T.)"
        as the character filter expression and drop it into the query.filter variable

        query.filter = "flattenquery(" + filter + ")"
        ? query.filter
        = "flattenquery((mailhd_id = 'ABC') .and. (Mail_List->Reprint=.T.))"

        query.filter = "flattenquery(" + "(mailhd_id = '"+vMailID+"') .and. (Mail_List->Reprint=.T.)" + ")"
        I think this can be reduced slightly in length but it's time for more wine.
        There can be only one.


          Re: Query Filter - Expression for Variable Charactor

          query.filter = "flattenquery(" + "(mailhd_id = '"+vMailID+"') .and. (Mail_List->Reprint=.T.)" + ")"

          is correct (as far as I know) and it shows the distinction between the flattenquery function and the string within it but it seems a bit confusing to me because of the two extra " + " groups that aren't needed. So, to take it one step further...

          If the end result needs to be (as Stan showed):
          "flattenquery((mailhd_id = 'ABC') .and. (Mail_List->Reprint=.T.))"

          then you could just replace the ABC with " + vMailID + " so the resulting expression would be:
          "flattenquery((mailhd_id = '" + vMailID + "') .and. (Mail_List->Reprint=.T.))"

          - Single quotes are in red just to make them easy to identify.
          - Single quotes can be replaced with \" if desired and should be replaced with \" if there is any chance of a single quote (think apostrophe) appearing in the variable.
          - Yes, for the nit picky, there are extra parentheses that are not absolutely necessary but they do help clarify what's happening.

          Disclaimer: There might be some way to use quote() or s_quote() but I never use those functions so I'm not sure. I learned to build expressions long before those functions were available so using them actually seems more confusing to me.


            Re: Query Filter - Expression for Variable Charactor

            Good morning, Stand and Cal

            Thank you for your help.


              Re: Query Filter - Expression for Variable Charactor

              To use quote(), or s_quote() here we can lose the single quotes.

              query.filter = "flattenquery(" + "(mailhd_id = "+quote(vMailID)+") .and. (Mail_List->Reprint=.T.)" + ")"
              The quote() or s_quote() is interchangeable since the variable is character type.
              There can be only one.