Using an ArrayList as a datasource

[2006 IR Open Dicussion]

By: cyclistca - cyclistca

Using an ArrayList as a datasource

2006-03-29 17:04

I've created my own class that implements JRDataSource.

 

I've created an ArrayList in my Java application and sent it as a parameter value in my HashMap to the application.

 

Now I want to us the ArrayList as the datasourse for my Subreport. How do I go about doing this? I can not figure out in the report how to point my subreport to the class that implements JRDataSource.

 

How do I also get my class to point to the particular ArrayList that I am passing from my application to the report?

 

 

 

 

By: jasperkan - jasperkannan

RE: Using an ArrayList as a datasource

2006-03-31 14:40

u need to create an Object of type JRCollectionDataSource . U can pass a collection to the constructor of this class directly .

 

in my case i m doing it from a scriptlet class

as given below.

 

net.sf.jasperreports.engine.data.JRMapCollectionDataSource map = (net.sf.jasperreports.engine.data.JRMapCollectionDataSource) this

.getVariableValue("COLLECTION_DATASOURCE");

if (map==null)

map = new JRMapCollectionDataSource(l);

 

this.setVariableValue("MY_COLLECTION_DATASOURCE", map);

 

Now u have this datasourcemap as a variable in ur report so u can pass this to a subreport

as a datasource . instead of report connection , say Datasource and give the expression as

$V{MY_COLLECTION_DATA_SOURCE} .