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How To Run LOOKUP a Single Time, Produce Multiple Resulting Variables, Each With A Different Value From The Record

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  • How To Run LOOKUP a Single Time, Produce Multiple Resulting Variables, Each With A Different Value From The Record

    I'm just understanding how to use LOOKUPC() and LOOKUPN(), from what I've seen, that function allows you to quickly locate a target record and return a single value of a single record, and, store that value in a variable.
    Suppose I want to retrieve multiple values from that single record and store each one in its own variable, The only way I can think of right now is to run the LOOKUP() multiples times and retrieve each desired value on each run.
    Is there a way to run the LOOKUP() just once and retrieve multiple values from the record?
    Example, suppose I run LOOKUPC() on a "Products" table, and, from the record that it locates, I want to store a variable for each of the following:
    Product_ID
    Dept_ID
    Item_Num
    Descrip
    Price

    I feel this is where an array comes in, but, I haven't found any viable solution so far. I'm not experienced with Arrays.

  • #2
    The documentation suggests that it is possible to return multiple fields from a LookupC, Nigel.
    Sounds like it would be possible to assign the values from a multi field returned lookup.
    Ted Giles
    Example Consulting - UK
    .

    sigpichttp://ec12.example-software.com//
    See our site for Alpha Support, Conversion and Upgrade.

    Comment


    • #3
      Set lookupc() to return a string containing each field value, separated with a convenient delimiter character. i.e. define an expression to concatenate the desired field values, separated with the delimiter. I often use "*". Then parse the string into its parts with separate calls to the word() function.

      Comment


      • #4
        Or write your own function and return a pointer variable with all of the variables needed.
        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.

        Comment


        • #5
          An example of multiple field lookup:
          multi = lookupc("F",inv.course_id,"dtoc(COURSE_DATE)+TCHR_ID+tfc_id+tfc_name","courses","Id") 'multiple fields
          eval("tbl.K"+str(x,1,0)+"datum") = ctod(left(var->multi,10))
          eval("tbl.K"+str(x,1,0)+"nr") = inv.course_id
          tbl.Dozent = mid(var->multi,11,5)
          tbl.Schulid = mid(var->multi,16,5)
          tbl.Schulort = mid(var->multi,21,38)
          Jo Hulsen
          Dommel Valley Solutions
          The Netherlands

          Comment


          • #6
            I don't know what context you are doing this.

            Have you considered having a set that includes the table that you are looking up to?
            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.

            Comment


            • #7
              Sorry, I should have tested my code first. This works now in the interactive window.

              From the help

              Dim My_Return_Var as A
              Lookup_Value as A = LOOKUP( Lookup_Table as C, Filter as C, Lookup_Expression as C )

              Code:
              Dim My_Return_Var as A
              My_Return_Var = lookup("products","Product_ID = '12345' " , "Product_ID + '*' + Dept_ID + '*' + Item_Num + '*' + Decript + '*' + Price")
              
              varProduct_ID = word(My_Return_Var,1,"*")
              varDept_ID = word(My_Return_Var,2,"*")
              varItem_Num = word(My_Return_Var,3,"*")
              varDescrip = word(My_Return_Var,4,"*")
              varPrice = word(My_Return_Var,5,"*")
              
              ?varProduct_id
              = "12345"
              
              ?varDept_ID
              = "55555 "
              
              ?varItem_Num
              = "55555-01 "
              
              ?varDescrip
              = "Widget "
              
              ?varPrice
              = "15.59"
              Note: I used lookup() as you are returning both characters and numbers

              Last edited by Ronald Anusiewicz; 08-10-2020, 12:11 PM.
              Alpha Anywhere v3.5
              Version 12.3, Build 2999
              MySql56 & DBF's

              Alpha 4, 5, Anywhere

              Ron Anusiewicz

              Comment


              • #8
                Thanks very much guys. I got it working after the 1st 2 posts from Ted and Tom, then, Ronald kinda confirm I was on the right path with is example.
                The following is what I did and it works.

                Dim TN as C
                Dim Found_Product As C

                TN = table.filename_get("products")

                Found_Product = Found_Product = lookupc("F",Product_Lookup,"Product_ID + "*" + Item_Num + "*" + Dept_Id + "*" + Department + "*" + Tax + "*" + str(Un_Price,19,11) + "*" + str(T_Price,19,11) + "*" + str(Qty_Onhand,19,3)",TN,"Alu")

                DIM GLOBAL Invoice_Nu AS c
                Invoice_Nu = :POS:invoice_nu.value

                tbl = table.open("invoice_items")
                tbl.enter_begin(.T.)
                tbl.Invoice_Nu = INVOICE_NU
                tbl.Product_id = word(Found_Product, 1, "*")
                tbl.Item_num = word(Found_Product, 2, "*")
                tbl.Dept_Id = word(Found_Product, 3, "*")
                tbl.Department = word(Found_Product, 4, "*")
                tbl.Price = Val(word(Found_Product, 6, "*"))
                tbl.T_Price = Val(word(Found_Product, 7, "*"))
                tbl.Qty_Before = Val(word(Found_Product, 8, "*"))

                tbl.enter_end(.T.)
                tbl.close()

                As you can see, this function eliminated the need to place the data from each field into individual variables, I was able to fetch each fields data straight from the main variable into target table.

                After looking at Ronald's example and his explanation as to why he used LOOKUP() as opposed to LOOKUPC() (which makes sens as I am retrieving both character and number), I'm left wondering, if LOOKUP() is good for whatever data type I'm retrieving, what's the purpose/benefit/need for LOOKUPC() and LOOKUPN(), why do those even exist ??? Please note, that in my codes above, I used LOOKUPC(), I then converted the numeric data into character so they would be compatible. Ronald used LOOKUP() and didn't need to convert his data. This is a POS system and speed in very important, is there any speed difference between these 2 functions?

                Comment


                • #9
                  With lookup you can search any field in the table, with lookupC etc. you must search an indexed field for the match. I assume this is much quicker

                  Comment


                  • #10
                    Looks like this could be a field rule table lookup and would be easier and better performance.
                    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.

                    Comment


                    • #11
                      I switched my LOOKUPC() to LOOKUP(), I'm not sure which one armasoft was referring to when he said "I assume this is much quicker". So far the result seems very promising, but it hasn't been tested in the field as yet.

                      Dim Found_Product As C
                      DIM filterstring as c
                      filterstring = "UPC = " + s_quote(Product_Lookup)
                      Found_Product = lookup("products",filterstring,"Product_ID + "*" + Item_Num + "*" + Dept_Id + "*" + Department + "*" + Tax + "*" + Un_Price + "*" + T_Price + "*" + Qty_Onhand")

                      DIM GLOBAL Invoice_Nu AS c
                      Invoice_Nu = :POS:invoice_nu.value

                      tbl = table.open("invoice_items")
                      tbl.enter_begin(.T.)
                      tbl.Invoice_Nu = INVOICE_NU
                      tbl.Product_id = word(Found_Product, 1, "*")
                      tbl.Item_num = word(Found_Product, 2, "*")
                      tbl.Dept_Id = word(Found_Product, 3, "*")
                      tbl.Department = word(Found_Product, 4, "*")
                      tbl.Price = Val(word(Found_Product, 6, "*"))
                      tbl.T_Price = Val(word(Found_Product, 7, "*"))
                      tbl.Qty_Before = Val(word(Found_Product, 8, "*"))

                      tbl.enter_end(.T.)
                      tbl.close()

                      For now I'm very hopeful. Thanks to everyone for their time and assistance.

                      Comment


                      • #12
                        I'd expect the standard lookup() to be slower as it isn't necessarily using indexed records

                        Comment


                        • #13
                          Currently, I am using lookup() on fields that do have index.
                          Some of the fields in the results are not indexed, like "price" for example, but the fields that are searched are all indexed.

                          Comment


                          • #14
                            If it works, Nigel, stop fiddling.
                            Ted Giles
                            Example Consulting - UK
                            .

                            sigpichttp://ec12.example-software.com//
                            See our site for Alpha Support, Conversion and Upgrade.

                            Comment


                            • #15
                              Lol! I will Ted.
                              It wasn't working fast enough before, but it seems to be on the right path now.

                              I really appreciate everyone's contribution.

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