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I need to put in a row the time difference between current row and the next

m29

If I need to put in a row the time difference between current row and the next, what should I do?(for the first row I need the values from the first and the second row). Something like row.next()["TimeStamp"] - row["TimeStamp"].

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mwilliams

If you put a text box attached to your dataSet at the top of your report design and hide it, the dataSet will run before all other elements in your report. In your onFetch, you could create an array or hash map or something of your data. So, since the dataSet will have ran, this data will be stored in the array prior to your table being created. In your table, you'll now have an array that you can step through, so you can jump ahead to the next value to do your computation. Hope this helps.

m29

Thanks. This is a "good to know" trick.
If the query is time consuming, the table can start to be drawing in the meantime?

mwilliams

Actuate BIRT's viewer has that capability. If there are many pages of the report, the first ones are available to view as the report is still running. This is not a feature of the open source viewer. You'd have to create this yourself. However, even with Actuate BIRT, I don't know how that would work out when the query will run first for the text box that is hidden. Either way, out of the box, you're going to wait with the Eclipse BIRT viewer. Hope this answers your question.