Subdatasets
Apress eBooks · 2008
Report generation is based on a single datasource (such as a query, a collection of JavaBeans, or an XML file). When you deal with a chart or a crosstab, this might not be sufficient, or it might simply be easier to retrieve the chart or crosstab data using a specific query or in general using another dataset. A subdataset is used to provide a secondary record set inside a report (performing an additional query using a new datasource). Currently, you can use a subdataset to fill only a chart or a crosstab. You can have an arbitrary number of subdatasets in a report.