subreports using java bean data source

[wexwarez]

I have purchased the manuals and everything but there is no example of creating subreports with a java bean data source. I can't figure out how to do it. For instance if you were creating an inventory report. You might have a report of product categories with a subreport for each item. I would have a java bean Category that contains a property that is a Collection of items. The category report would loop on the category bean with a subreport for the items collection.

 

How do you set the subreports data source from a field registered from the category java bean data source?

 

thanks

[lucianc]

If you have a List getItems() method that returns item beans, all you need to do is to map a field to the items collection and use create a JRBeanCollectionDataSource when instantiating the subreport:

Code:

<import value="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
..
<field name="items" class="java.util.List"/>
..
<subreport>
  ..
  <dataSourceExpression>
    new JRBeanCollectionDataSource($F{items})
  </dataSourceExpression>
  ..
</subreport>

 

HTH,

Lucian

[RoseRoo]

Example of master report bean:

Code:

private String name;
private String ID;
private JRDataSource workListDS;

 

Example of sub report bean:

Code:

[code] private String ID; private String workName;

 

STEP_1:

Use an ArrayList to hold all sub report bean(s)

Code:

[code] arrayList.add(subBean1); arrayList.add(subBean2); ...

 

STEP_2:

Put list into data source, and set on master bean

Code:

[code] JRDataSource jrds=new JRBeanCollectionDataSource(arrayList); masterBean.setWorkListDS(jrds);

 

STEP_3:

Use DataSource Expression for SubReport in iReport

Code:

[code] $F{workListDS}

 

Hope it helps~:)

 

--

We are coming from TAIWAN ~_~

[wexwarez]

RoseRoo,lucianc-

Thanks for the replies. I got it working!!! Now I just need to figure out why the spacing is so funky. THanks.

[wexwarez]

RoseRoo,lucianc-

Thanks for the replies. I got it working!!! Now I just need to figure out why the spacing is so funky. THanks.