What should be the connection string while using CQL jdbc driver
문제
What should be the connection string while using CQL jdbc driver?
Will I be able to find a proper/complete example for CQL using CQL JDBC driver in Java online?
해결책
You'll need the cql jar from the apache site.
Here's the basic test I used after entering data via CLI (using sample from wiki):
public class CqlJdbcTestBasic {
public static void main(String[] args) {
Connection con = null;
try {
Class.forName("org.apache.cassandra.cql.jdbc.CassandraDriver");
con = DriverManager.getConnection("jdbc:cassandra:root/root@localhost:9160/MyKeyspace");
String query = "SELECT KEY, 'first', last FROM User WHERE age=42";
Statement stmt = con.createStatement();
ResultSet result = stmt.executeQuery(query);
while (result.next()) {
System.out.println(result.getString("KEY"));
System.out.println(result.getString("first"));
System.out.println(result.getString("last"));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (con != null) {
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
con = null;
}
}
}
}
The user/password (root/root) seems arbitrary, just be sure to specify the Keyspace (MyKeyspace)
Note, 'first' is quoted in the query string because it is an CQL keyword
다른 팁
You may also try using the cassandra-jdbc driver from http://code.google.com/a/apache-extras.org/p/cassandra-jdbc/.
Alternatively using the following maven dependency:
<dependency>
<groupId>org.apache-extras.cassandra-jdbc</groupId>
<artifactId>cassandra-jdbc</artifactId>
<version>1.2.1</version>
</dependency>
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