如何通过iReport将数据集从主报表传递到子报表？

Question

I would like to transfer dataset from main report to subreport in iReport. In Odoo version7, I have used just like this.

<parameter name="param_obj" class="java.lang.Object" isForPrompting="false"/>
<subreport>
   <reportElement x="0" y="0" width="555" height="13"/><subreportParameter name="tl_cAsset">
     <subreportParameterExpression><![CDATA[$P{tl_cAsset}]]>  </subreportParameterExpression>
   </subreportParameter>
   <dataSourceExpression><![CDATA[$P{param_obj}]]></dataSourceExpression>
   <subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "acc_balance_current_assets2.jasper"]]></subreportExpression>
</subreport>

Now I using Odoo version 8 and new jasper_reports module for version 8. So I transferred some of the jar files from jasper_reports module to iReport IDE. Later... all the reports from odoo version7 caused Groovy errors. That's why I changed Groovy language to Java language in iReport. But... all the subreports didn't work because param_obj paramter didn't bring the dataset to subreport.

If I changed dataSourceExpression from param_obj to $P{REPORT_DATA_SOURCE} that built-in parameter like this:

<dataSourceExpression><![CDATA[$P{REPORT_DATA_SOURCE}]]></dataSourceExpression>

, I got the error like this:

Failed to invoke method execute in class com.nantic.jasperreports.JasperServer: Field "Name-name" not found in data source. 

subreport didn't get fields from the paramter datasource.

How should it be? I don't know how to pass the main dataset to subreport. If you don't mind, please explain step by step.

PS. I used XPath query language and used xml template file for that dataset.

Answer 1

Use field tag instead of parameter tag.

It means, you can replace :

<parameter name="param_obj" class="java.lang.Object" isForPrompting="false"/>

With:

<field name="param_obj" class="java.lang.Object" />

If it is not ok, you can try with another way in here.