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indexes and filters

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    indexes and filters

    Why won't this work?

    I have an index on a table. In the Index Builder I have said in the Filter Expression column that I want a particular field in the table to be equal to a global variable. I am able to select this variable when defining the filter. When a button is pressed on a form, this global variable is set to a value and then the table and index are opened. Everything seems to be going well except that the browse which opens up shows EVERY record, not just those that match the variable.

    I just want to know whether this seems like a reasonable approach.

    Thanks,

    Martin.

    #2
    RE: indexes and filters

    I don't see how the index can be built correctly if the value of the global variable is not known at the time it is built. Must be building an index on the current value in the variable.

    I think I would have the button run a query, based on the global variable, which took advantage of an index, not filtered, on the field in question.
    There can be only one.

    Comment


      #3
      RE: indexes and filters

      Martin,

      In my opinion it's NEVER a good idea to base an index definition on an expression that includes a variable. I think it's a formula for disaster. As the value of the variable changes none of your previous entries will be visible, since they no longer match the new variable.

      In my opinion is HARDLY EVER a good idea to define an index that includes a FILTERING expression.

      I much prefer using a query, as Stan has already recommended.

      -- tom

      Comment


        #4
        RE: indexes and filters

        Thanks, both of you. My problem was due to my ignorance of the way filters work in xbasic; in some languages a filter is something applied as one moves through the data file, not previously applied on indexing. I now realise I mean query, not filter. Thanks for your valuable time.

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