title: Queries on multiple database with codeIgniter
body: <p>I have 2 databases, and I would like to make a query with the 2 databases, like for example</p>
  
  <pre><code>SELECT base1.table1.item1 FROM base1.table1 INNER JOIN base2.table3 ON base2.table3.item2 = base1.table1.item2 WHERE base2.table3.item4 = 'toto';
  </code></pre>
  
  <p>How to make this query with codeIgniter ?
  I already have configured database.php in CodeIgniter with the 2 databases.</p>
  
  <p>Thanks.</p>