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Update expressions Freeze program

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    #1

    Update expressions Freeze program

    Using build 1026 Intermittent problem with expression builder freezing at various points within an expression or at completion of expression. Happening 50 - 60 % of the times tried. When it happens mouse clicks and keybaord strokes are not accepted. Must end task to close program and restart. Problem is with more than one table. I am attaching files of table where problem most recently occured.
    Sample expression that fails is an update of ->Full_address
    alltrim(substr(Full_address,at(",",Full_address)+2))
    As noted the freeze may occur at any point within the expression or while evaluating the completed expression.
    Tags: None
    #2
    RE: Update expressions Freeze program

    Gary,

    I'll take a stab at this.

    I'm kind of surprised that A5 is evaluating your expression at all.

    The reason I say that is that you didn't tell the Substr() function how many characters you want it to grab.

    You tell it the starting point using the AT() function, then you add 2 to that number. But you need to define the second paramenter.

    Something like:

    ALLTRIM(Substr(Full_Address,at(",",Full_address)+2,(at(",",Full_address,2)-at(",",Full_address)-2)))

    should get you started.

    It looks to me like your trying to parse the Full_address field into Address, City, State and ZIP

    The problem you gonig to have is that the data isn't delimited (with commas) exactly the same in every record.

    Some record have two sets of commas, some three, and at least one has 4.

    You may need to parse the data by working from the right and moving toward the left, using the rat() function.

    Do ZIP first, State second, City third, etc.

    Comment

      #3
      RE: Update expressions Freeze program

      forgot to mention.

      You may want to first count the number of comma's in each full_address field by using the Occurs() function.

      Then using a Case() or IF() define expressions, along with the AT()/RAT() function locate the positions of the commas and parse your data that way.

      Comment

        #4
        RE: Update expressions Freeze program

        Vince

        Actually the substr() function only needs a starting point, which is generated by the at() function. To quote the expressions manual:

        "If you omit the NumberOfCharacters parameter, SUBSTR returns the right portion of the CharacterString beginning at the StartingPosition."

        I tried his expression with his table in the expression builder and it works everytime. The questions that I have are what happens if at() returns 0 or the Full_address value is blank. I didn't test that. That situation should be trapped in the expression.

        Jerry

        Comment

          #5
          RE: Update expressions Freeze program

          Jerry,

          Thanks for the clarification on the Substr(). All this time I thought the second paramater was required.

          Good to know. Thanks for the info.

          I also did not get A5 or the expression builder to lock up.

          Comment

            #6
            RE: Update expressions Freeze program

            Actually, eventually I did get what I needed in each field from the Full_address field , however, it probably took me five or more attempts for each update. If it never failed for both of you I am not sure where to direct my attention. Can it hurt to go back to build 1024, since I never had the problem there, see if it happens and if not put 1026 back in just to see ?
            Thanks to you both for looking into this.

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