What should be the connection string while using CQL jdbc driver

问题

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?

回答1:

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

回答2:

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>

来源：https://stackoverflow.com/questions/7688571/what-should-be-the-connection-string-while-using-cql-jdbc-driver

标签

java

cassandra

cql