Two DataSource in report

Question

I have to make a report in jasperReports
I fill my initial report with a DataSource like this

File mainJasper = new File( servletContext.getRealPath(\"/         


        

Answer 1

You can send the second one as a parameter.

parametros.put("dataSource2", List2 );

In the report set the parameter type as

net.sf.jasperreports.engine.data.JRBeanCollectionDataSource

You can use $P{dataSource2} as a datasource to a subreport, in a Table, in a List.

Not sure if I understood correctly or it was a different matter,but if you want this to be the datasource of your subreport go to the subreport element on the main report add the following lines to set it:

<subreport>
...
<dataSourceExpression><![CDATA[$P{dataSource2}]]></dataSourceExpression>
...
</subreport>

If this was not what you wanted and you need more specific details, let us know what exactly you will use the second datasource for.

An example - populate a table

1.declare a subdatase (supposing 'code' and 'caption' are the fields of your objects in List2)

 <subDataset name="Table Dataset 1">
            <queryString language="SQL">
                <![CDATA[]]>
            </queryString>
            <field name="code" class="java.lang.String"/>
            <field name="caption" class="java.lang.String"/>
        </subDataset>

2.the actual table - set the subDataset to have the name of the one you declared("Table Dataset 1") and REPORT_DATA_SOURCE parameter to be the parameter which contains your List2 ("dataSource2")

<jr:table ...>
    <datasetRun subDataset="Table Dataset 1">
        <datasetParameter name="REPORT_DATA_SOURCE">
             <datasetParameterExpression><![CDATA[$P{dataSource2}]]></datasetParameterExpression>
        </datasetParameter>
    </datasetRun>
.....
</jr:table>