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Query Order Syntax Question

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    Query Order Syntax Question

    I have a query filter that I use on a form which is:

    (if(Res_Detail->Type="t",2,if(Res_Detail->Datetba,3,1))+cshorttime(time))+ if(urgentmessage->message_delivered,"B","A")+invert(ctime(urgentmessage->datetime))

    I wish to put this into a query filter in xbasic. I have tried all manner of quotes and quote() and backslashes, etc. Can this be done? This will also help me try to understand the sytax for using quotes and such. Thank you.

    #2
    Re: Query Order Syntax Question

    Hi John,

    You can have nested IF statements, so I suggest you build you filter bit by bit till you get the right result. What you have here will never work as you are not testing the result of if(Res_Detail->Datetba,3,1) or if(urgentmessage->message_delivered,"B","A")
    Regards
    Keith Hubert
    Alpha Guild Member
    London.
    KHDB Management Systems
    Skype = keith.hubert


    For your day-to-day Needs, you Need an Alpha Database!

    Comment


      #3
      Re: Query Order Syntax Question

      Hi John,

      You can have nested IF statements, so I suggest you build you filter bit by bit till you get the right result. What you have here will never work as you are not testing the result of if(Res_Detail->Datetba,3,1) or if(urgentmessage->message_delivered,"B","A") The same as you are at the beginning if(Res_Detail->Type="t",2,
      Regards
      Keith Hubert
      Alpha Guild Member
      London.
      KHDB Management Systems
      Skype = keith.hubert


      For your day-to-day Needs, you Need an Alpha Database!

      Comment


        #4
        Re: Query Order Syntax Question

        John,

        The first thing to consider is that to use that query in xbasic it must be a string (character) espression. That means it must begin with a quote and end with a quote. When you do that any quotes inside of the beginning and end quotes must be "handled". They can be escaped, converted to single quotes, or chr(92) equivalents substituted.

        Additionally, inside a character string Alpha doesn't know the difference between variables and the text that represents them.

        "some_field_name = var->some_variable_name" means exactly that. Alpha doesn't know that you want to use the value assigned to some_variable name.


        If none of the references in your filter are variables then you should be able to use

        "if(Res_Detail->Type=\"t\",2,if(Res_Detail->Datetba,3,1))+cshorttime(time))+ if(urgentmessage->message_delivered,\"B\","\A"\)+invert(ctime(urgentmessage->datetime))"

        this uses the backslash character to tell Alpha that the quotes inside the expression are litterally quotes, not the end of the string.
        There can be only one.

        Comment


          #5
          Re: Query Order Syntax Question

          The wiki has additional examples here.

          Comment

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