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exactly equal set link

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    #1

    exactly equal set link

    I haven't come across this as a problem before now, but now it's a problem for me and can't find the answer so far. Set linking field values need to be unique, right. Is there a way to make the set linking value follow the exactly equal to (==) instead of the equals to because there is no discrimination between upper case and lower case letters as a baseline so that ABCDEF and abcdef in set linkages are considered equal and I have a circumstance that a set link for a specific report based on a concatenation of 4 fields generates values that under these conditions produces linkage when I need them not to.

    dim v1 as C="AMD_W9871_A1035_B"
    dim v2 as C="AMD_w9871_A1035_b"

    ? v1=v2
    = .T.
    Mike W
    __________________________
    "I rebel in at least small things to express to the world that I have not completely surrendered"
    Tags: None
    #2
    Re: exactly equal set link

    Probably not the most elegant solution, but off the top of my head you could create a calculated field that uses the MD5() or *CRC() functions to create a hash and then use that value to link the set.

    Code:
    ?MD5("AMD_W9871_A1035_B")
= "6ba6fa3124c9717be386899fa33fb536"

?MD5("AMD_w9871_A1035_b")
= "1bb5683a3769f9b2bc12ccc010c25921"

?*CRC("AMD_W9871_A1035_B")
= 4294919559

?*CRC("AMD_w9871_A1035_b")
= 4294955301

    Comment

      #3
      Re: exactly equal set link

      ..error.. sorry wrong thread
      Last edited by Allen Klimeck; 08-14-2013, 03:55 PM.

      Comment

        #4
        Re: exactly equal set link

        Mike:
        I have not use == in a set link but maybe ASC() will work for you:
        Code:
        dim v1 as 
v1="AMD_W9871_A1035_"+asc("B")
?v1
= "AMD_W9871_A1035_66"

dim v2 as C
v2="AMD_w9871_A1035_"+asc("b")
?v2
= "AMD_w9871_A1035_98"

?v1=v2
= .F.

        Comment

          #5
          Re: exactly equal set link

          Or if you change the order of the concatenation:
          Code:
          dim v1 as 
v1="B-AMD_W9871_A1035_"
?v1
= "B-AMD_W9871_A1035_"
dim v2 as C
v2="b_AMD_w9871_A1035_"
?v2
= "b_AMD_w9871_A1035_"
?v1=v2
= .F.

          Comment

            #6
            Re: exactly equal set link

            jacob,
            Thanks so much! MD5() that's the ticket. Love adding new functions to my repertoire!

            G, How the heck are you? ASC is a great thought, but the difference in case are sometimes within an unpredictable central location of a multi-character string ( ex: WAS and WaS ), so can't key in on which character is different.
            Mike W
            __________________________
            "I rebel in at least small things to express to the world that I have not completely surrendered"

            Comment

              #7
              Re: exactly equal set link

              I am fine, thanks for asking.
              You could do this:
              Code:
              dim v1 as C="AMD_W9871_A1035_B"
dim v2 as C="AMD_w9871_A1035_b"

v1_H=*to_hex(v1)
?v1_H
= "414D445F57393837315F41313033355F42"

v2_H=*to_hex(v2)
?v2_H
= "414D445F77393837315F41313033355F62"

?v1_H=v2_H
= .F.
              Or, if you want to go nuts you could covert to binary..don't think it will work though.

              Comment

                #8
                Re: exactly equal set link

                Ok, thanks, more choices. I like choices!
                Mike W
                __________________________
                "I rebel in at least small things to express to the world that I have not completely surrendered"

                Comment

                  #9
                  Re: exactly equal set link

                  case_preserve(). Alpha uses this to create an index when you ask for a field rule lookup of 'previous values'.

                  Bill.

                  Comment

                    #10
                    Re: exactly equal set link

                    Thanks Bill.
                    It becomes a linkage by expression case_preserve("<linking_field_name>") in the set design, and works perfectly. Funny how many years I've been doing this and this never surfaced, and apparently the inexact linkage not well known.
                    Mike W
                    __________________________
                    "I rebel in at least small things to express to the world that I have not completely surrendered"

                    Comment

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