Solr Java Client

[Baskar Sikkayan]

Hi,
  I am new to Solr and trying to use Solr java client instead of using the
Data handler.
  Is there any configuration i need to do for this?

I got the following sample code.

 SolrInputDocument doc = new SolrInputDocument();

              doc.addField("cat", "book");
              doc.addField("id", "book-" + i);
              doc.addField("name", "The Legend of the Hobbit part " + i);
              server.add(doc);
              server.commit();  // periodically flush

I am confused here. I am going to index 3 different tables for 3 different
kind of searches. Here i dont have any option to differentiate 3 kind of
indexes.
Am i missing anything here. Could anyone please shed some light here?

Thanks,
Baskar.S