title: Spring and Mixing SQL and NoSQL db
body: <p>The answers to <a href="https://stackoverflow.com/questions/3208821/strategic-issue-mixing-relational-and-non-relational-db">my previous post</a> encouraged me mixing SQL and NoSQL db.</p>
  
  <p>What is the best practice implementation of two databases in terms of application context configuration and DAO creation? </p>
  
  <p>Let's choose Derby as the SQL db and Cassandra as the other one. What I am searching for is e.g. an example appcontext.xml, two DAOs, one implementing CRUD on Derby and the other one ond  Cassandra and <em>one</em> (not two) sample unit test using both DAOs simultanously.</p>
  
  <p>Tutorials, sample (maven ;-) ) projects, book recommenditions etc. welcome.</p>