JasperReports / iReport Designer：我可以有条件地展示乐队吗？

Question

I have created a report as follow:

Multiple detail band each detail band contains 1 table. Each table is linked to 1 dataset.

Can I hide the detail band whenever the result set of the query returns Empty set (no result found)?

how can I achieve this?

Answer 1

In the "Properties" of each Detail band you have an option called "Print When Expression" there you can place logic that evaluates to boolean .

When you fill it with your logic and it returns true this detail band is printed.

So, you will need to have the information if the table will be filled in advance and cannot address the dataset within.

If your datasets are too different to do this, you should overwrite the Dataset for the main report with a custom one that gathers the information and sets the fields appropriately.