Display a Sum on the Next Page
【Question】
I need to display previous-page sum value (Amount of items sold) in the current page. If it is the first page then there’s no such display. From the second page onwards the total sum value of the previous page should be displayed at the top.
Ex : Page : 1
1.2 Product_Name Amount
Product1 100
Product2 200
Page : 2
1.3 Product_Name Amount
Pre.page_sum 300
Product3 400
【Answer】
JasperReport can’t calculate the sum of previous page at print. You can calculate sum for each group, union them together to insert the previous-page sums into the report data source in order during data preparation, leaving the reporting tool handle the paging only. It’s easy to do this in SPL (Structured Process Language).
| A |
|
| 1 |
=$select Product,Amount from tb |
| 2 |
=$select Product,Amount from tb |
| 3 |
=A2.new(“Pre.page_sum”:Product,~.sum(Amount):Amount) |
| 4 |
=A2.conj(~|A3(#)) |
A1: Data retrieval.
A2: Group every (page_Row-1) (the parameter representing a number) rows.
A3: Sum each group and create a new table sequence.
A4: Union each group and its sum and return it to JasperReport for paging.
You can connect to esProc in JasperReport via JDBC. Calling an SPL script is the same as calling a stored procedure. For more information, see How to Call an SPL Script in JasperReport.
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