{"id":33641,"date":"2014-12-08T01:00:28","date_gmt":"2014-12-07T23:00:28","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=33641"},"modified":"2014-12-07T19:10:34","modified_gmt":"2014-12-07T17:10:34","slug":"getting-started-with-apache-cassandra-and-java-part-ii","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2014\/12\/getting-started-with-apache-cassandra-and-java-part-ii.html","title":{"rendered":"Getting Started with Apache Cassandra and Java (Part II)"},"content":{"rendered":"

Requirements<\/h2>\n

To follow this tutorial, you should already have a running instance of Cassandra (a small cluster would be good<\/a>, but not necessary), the Datastax Java driver installed (refer to Part I<\/a>), and have gone through the 10 minute walkthrough here: http:\/\/planetcassandra.org\/create-a-keyspace-and-table\/<\/a>.
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Try it out<\/h2>\n

For this demo, we\u2019re going to be creating a simple console application, almost identical to the one in Part I, only this time we will be exploring connection policies, prepared statements, and query builder. Open a text editor and create a java file with a \u201cGettingStartedTwo\u201d class and a single main method.<\/p>\n

public class GettingStartedTwo {\r\n \r\npublic static void main(String[] args) {\r\n \r\n        Cluster cluster;\r\n        Session session;\r\n        ResultSet results;\r\n        Row rows;<\/pre>\n
Then we can connect to our cluster and create a session instance.<\/p>\n
\/\/ Connect to the cluster and keyspace \"demo\"\r\nCluster cluster = Cluster.builder()\r\n                  .addContactPoint(\"localhost\")\r\n                  .build();\r\nSession session = cluster.connect(\"demo\");<\/pre>\n
But wait, now that we are running a cluster instead of a single instance, we\u2019ll want to put some safeguards in place incase of a failover. We can do this using a RetryPolicy.The retry policy determines the default behavior to adopt when a request either times out or a node is unavailable. We\u2019re using the DefaultRetryPolicy in this case, which will retry queries either:<\/p>\n