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Complex Filter Help

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    #1

    Complex Filter Help

    I have and auto parts inventory table on a form contained in an embedded browse. On entry, I need to show only the parts related to a particular auto make, model, year. The table contains the field Veh_make, Veh_model, and Veh_year. On entry to the form, the global variables recmake, recmodel, & recyear are set.

    The following filter code works:
    query.filter="Veh_make="Ford".AND.Veh_model="Tempo".AND.Veh_year="1991"
    also the following works
    query.filter="Veh_make=var->recmake.AND.Veh_model="Tempo" .AND.Veh_year="1991"

    but trying
    query.filter=Veh_make=var->recmake .AND. Veh_model=var->recmodel .AND. Veh_year = "1991"

    no records are found. After reading Dr. Waynes and Tom Cone articles on Query Filters, I tried all types of +"'\ combinations with no success. It seems the second and condition with a variable causes the problem. Another gotcha is the Veh_year is a numeric field while the others are character.

    I certainly could use some help cause my customer is insisting that the browse show only the parts for the particular car. The service writer has problems....

    Thanks in advance, Sam


    Tags: None
    #2
    RE: Complex Filter Help

    Try query filter = "Veh_make='"+var->recmake+"'"+" .AND. Veh_model='"+var->recmodel+"'"+" .AND. Veh_year = 1991"

    but I can't understand when you say veh_year is numeric and that query.filter="Veh_make="Ford".AND.Veh_model="Tempo".AND.Veh_year="1991" works. Clearly the veh_year is character in this expression, just as the other two variables are character.

    If the first expression doesn't work, query filter = "Veh_make='"+var->recmake+"'"+" .AND. Veh_model='"+var->recmodel+"'"+" .AND. Veh_year = '1991'" should.

    Additionally...
    "It seems the second and condition with a variable causes the problem." - your expressions do not pass the variable's value to the expression, they sort of pass the name of the variable to the expression, but not really.

    I sleep with a copy of Tom's article under my pillow but you might also look at Cal Locklin's discussion in the tips section of the Alpha website.

    Good luck.
    There can be only one.

    Comment

      #3
      RE: Complex Filter Help

      Should have added the advice to cut and paste from this post. The combinations of +, ", and ' are hard to read. Paste into a word processor and increase the font size to see the differences.
      There can be only one.

      Comment

        #4
        RE: Complex Filter Help

        I swear I posted something like this before but now I can't find it.

        When building complex filters, I find the following step-by-step procedure helpful:

        1. Start by writing out a specific filter as though you were entering it in a report's detail properties.
        EX: Veh_make="Ford" .and. veh_model="Taurus" .and. veh_year=1991

        2. Change all the double quotes to single quotes:
        EX: Veh_make='Ford' .and. veh_model='Taurus' .and. veh_year=1991

        3. Put double quotes around the whole thing:
        EX: "Veh_make='Ford' .and. veh_model='Taurus' .and. veh_year=1991"

        4. THIS IS THE PART WHERE YOU HAVE TO PAY ATTENTION TO WHAT YOU ARE DOING! Find the first text that you want to replace with a variable and replace it with that variable using something like this: " + var->varname + "
        In this case we want to replace Ford with var->recmake so we use " + var->recmake + "
        EX: "Veh_make='" + var->recmake + "' .and. veh_model='Taurus' .and. veh_year=1991"

        5. Repeat step 4 for all the rest of the variables:
        EX: "Veh_make='" + var->recmake + "' .and. veh_model='" + var->recmodel + "' .and. veh_year=" + var->recyear + ""

        In this case, the result ends with two double quotes. This doesn't hurt anything but they can be removed as long as the plus sign is also removed:
        EX: "Veh_make='" + var->recmake + "' .and. veh_model='" + var->recmodel + "' .and. veh_year=" + var->recyear

        After writing all that:

        Ooops! I get angry when people don't read the whole thing and this time I didn't read all of Stan's comments until after I wrote this. That's were it was - in the tips section. Here's a link that should take you there: Tip 52

        Comment

          #5
          RE: Complex Filter Help

          Stan and Cal,
          Thanks for the quick reply. I'll print your replies out and sit down and digust them. I have to thank all who particpate in this message board for such a great help especially from us non-professionals.

          I get back to you to see if I was able to crack the code.

          Thanks again, Sam............

          Comment

            #6
            RE: Complex Filter Help

            I'M back. The following is the code I used. I left the Veh_year off to avoid confusion. The first query.filter yielded no hits where their should have been. Using the debug I found that Veh_make and Veh_model were blank and the two variables were okay with Ford and Tempo. Running the second query.filter, using the debug. tbl.veh_make = Ford and tbl.veh_model = Tempo but the resulting query yielded the famous "No such field".

            debug(1)
            query.filter="Veh_make='"+var->recmake+"'.AND.Veh_Model='"+var->recmodel+"'"

            query.filter="tbl.Veh_make='"+var->recmake+"'.AND.tbl.Veh_Model='"+var->recmodel+"'"

            query.order=""
            tbl.query_create()
            parent.resynch()

            Stan, I noticed you used a "+" before each .AND., I tried that also but with the same results. I have no idea why the veh_make and veh_model were blank but that would reult in no hits.

            Sam

            Comment

              #7
              RE: Complex Filter Help

              I use querries like this all the time

              vmodel="Taurus"
              vmake="Ford"
              vyear=1991

              query.filter="modelname=var->vmodel .and. makename=var->vmake .and. makeyear=var->myear"

              I mix dates, characters, numerics and logicals as in the above and they work like a charm - all without getting into the double/single quotes issues

              also, you can say

              query.filter="modelname=" + quote(parentform:modelname.value) + ".and. makename=" + quote(parentform:makename.value) ... etc.

              personally I hate the double/single quotes
              Cole Custom Programming - Terrell, Texas
              972 524 8714
              [email protected]

              ____________________
              "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

              Comment

                #8
                RE: Complex Filter Help

                Thanks Martin. You are absolutely correct. However, for those not familiar with the nuances, it should be pointed out that this would apply to:
                (1) a query that was being run in the current script, or
                (2) a filter being passed to a report or other layout IF the variables are defined as GLOBAL so the layout will recognize them.

                Comment

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