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| Re: Show summary so far on each detail line [message #723578 is a reply to message #723228] |
Thu, 08 September 2011 20:41   |
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Can you not use a computed column on the data set and then use a running
sum aggregate?
Jason
On 9/8/2011 1:53 AM, Richard wrote:
> We use dynamic sorting. That is, we build the query string, including
> the ORDER BY clause, in a Java event handler in the beforeOpen method.
> Each detail row has a column that contains a weight value. There is
> another column (called the "scale weight") that shows that accumulated
> total so far (the total of weight in the current row and all rows
> preceding it in the current sort order).
> We are able to calculate the scale weight in SQL by building a rather
> complex subquery that retrieves the appropriate SUM for each row. We
> build the SQL string of the subquery dynanically to handle an unlimited
> number of sort fields and to handle ascending and descending sort
> directions, which can vary from field to field. It works and is fast but
> the code is complex and difficult to maintain.
> It would be more straightforward to do calculate this field in BIRT. If
> define a report variable ("weightSoFar") ) with an initial value of
> 0.0., we could add the weight to weighSoFar as each row is calculated .
> We could then have the report column show this report variable.
> The question then is: Where do we add the row weight to weightSoFar? We
> tried onCreate for the row , but that's too late. We tried onPrepare,
> but the row data is not available. So where does it go? Or even better,
> is there another way to get the sum so far that we haven't come across?
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