JasperReports - Subreport-DataSource

Posted on December 1, 2011

How to provide the complete datasource of a report to the subreport.

In project I had the case that I had to pass the complete datasource of the parent report to a subreport.

JasperReports has a defined parameter REPORT_DATA_SOURCE that contains the current DataSource for the report. Unfortunately, it does not work if you try to pass the parameter directly as dataSourceExpression. For the subreport you need a new DataSource. For this the method cloneDataSource () is intended. This creates a clone of the Parent DataSource and can then be passed to the subreport.

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<subreport isUsingCache="false">
<reportElement x="0" y="0" width="595" height="842"/>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JRBeanCollectionDataSource) $P{REPORT_DATA_SOURCE}).cloneDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["reporting/details.jasper"]]></subreportExpression>
</subreport>

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