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Filter table Lookup - field rules

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  • #31
    Re: Filter table Lookup - field rules

    G, You are correct. I am thinking why not apply both approaches?
    Is not all the times we need such condition. Some times will be beneficial to go progressive.
    There is no degradation of speed to have both options.
    Is it?

    Comment


    • #32
      Re: Filter table Lookup - field rules

      Yes and very noticeable.
      If you do Progressive (or as some might want to call Cascading) lookup, you can use indices to narrow the range of searched records as you step from one field to the next. But if you do text search, you cannot apply an index here, alpha simply has to search the text of each field defeating the purpose of an index and markedly impeding the speed.

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      • #33
        Re: Filter table Lookup - field rules

        Originally posted by G Gabriel View Post
        Theoretically speaking.. yes.
        Not a good idea though.
        You can search for a word across fields, very easily done BUT slow as Molasses as you will be searching every word in every field in every record.
        You don't see that in any search online. Most searches are structured and cascaded for a reason. Should be something to do as a last resort, not as a matter of routine.
        A search for a word across multiple fields can be made fast by using an index like the one defined in the product table - even with a lot of data

        Code:
        Index_Keywords_For_Category    KEYWORDSI(ALLTEXT(),VAR->EXCLUDED_WORDS)         Ascending    All
        The question is how to call that index from a fieldrule lookup..... It certainly can be done from an xdialog or in a typical find by key.
        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

        http://www.iadn.com/images/media/iadn_member.png

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        • #34
          Re: Filter table Lookup - field rules

          So in the sample of post 24, we could not apply it?
          Or can we?

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          • #35
            Re: Filter table Lookup - field rules

            Originally posted by Al Buchholz View Post
            A search for a word across multiple fields can be made fast by using an index like the one defined in the product table - even with a lot of data

            Code:
            Index_Keywords_For_Category    KEYWORDSI(ALLTEXT(),VAR->EXCLUDED_WORDS)         Ascending    All
            The question is how to call that index from a fieldrule lookup..... It certainly can be done from an xdialog or in a typical find by key.
            Yes Al, but how many indices you going to have? Are you going to have an index for each word you want to search? There is a delicate balance between using indices and how many to have. The fewer that serve the most purpose the better.

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            • #36
              Re: Filter table Lookup - field rules

              Originally posted by JackForman View Post
              So in the sample of post 24, we could not apply it?
              Or can we?
              I didn't open Tim's zip file, just by reading his comments I am assuming that he did field rules lookup filtering out as you step from field to field using the previous field's value.
              In a scenario such as this you could use indices and would be very powerful. But if you use something that entails text search, you are in for a long ride.

              Comment


              • #37
                Re: Filter table Lookup - field rules

                Originally posted by G Gabriel View Post
                I didn't open Tim's zip file, just by reading his comments I am assuming that he did field rules lookup filtering out as you step from field to field using the previous field's value.
                In a scenario such as this you could use indices and would be very powerful. But if you use something that entails text search, you are in for a long ride.
                Gab,

                you are right. the lookup works fine with few records... but when i tried to use it with almost 16 thousand records, my computer crawled and oftentimes hung when i tried to using 3 text criteria.

                has anyone found another way to accomplish this?

                regards to all
                Francis

                Comment


                • #38
                  Re: Filter table Lookup - field rules

                  Sorry for not getting back to this thread before now.

                  Originally posted by G Gabriel View Post
                  I didn't open Tim's zip file, just by reading his comments I am assuming that he did field rules lookup filtering out as you step from field to field using the previous field's value.
                  In a scenario such as this you could use indices and would be very powerful. But if you use something that entails text search, you are in for a long ride.
                  Gabe, your assumption was wrong but your prognosis was/is spot on.
                  This is the expression used in the field rule filter for the product field.
                  Code:
                  if(alltrim(vTerm)<>"",smatch(Category+Brand+Model+Description,"*"+alltrim(strtran(vTerm,",","*"))+"*"),.t.)
                  This is basically doing a text search within each record so definitely has a high overhead.
                  Originally posted by fddizon View Post
                  Gab,

                  you are right. the lookup works fine with few records... but when i tried to use it with almost 16 thousand records, my computer crawled and oftentimes hung when i tried to using 3 text criteria.

                  has anyone found another way to accomplish this?

                  regards to all
                  Francis,
                  I am attaching another sample. Different technique, using indexes. I made a UDF that grabs the list of keys from an index(including their record numbers). This list of keys is then filtered using the search term. Next a list of record numbers is created from the resulting list of keys. This list of numbers is passed into the filter in the lookup.

                  Will attach the sample shortly.

                  Edit: Hit submit by mistake so post not yet finished
                  Last edited by Tim Kiebert; 11-14-2009, 03:14 AM. Reason: Hit submit button by mistake.
                  Tim Kiebert
                  Eagle Creek Citrus
                  A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.

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                  • #39
                    Re: Filter table Lookup - field rules

                    tim, thanks. will wait for your sample
                    Francis

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