查询cassandra-driver Node JS的问题

Question

我正在尝试为cassandra设置连接器。当我尝试查询数据库时，它不会回馈任何东西。这是片段

function CassandraConnector(host, hostPort, user, password) {
    if (!host || !hostPort) {
        logger.fatal("CassandraConnector cannot initialize without host and port configuration.");
        throw new Error("CassandraConnector unable to start");
    }
    this._dbHost = host;
    this._dbPort = hostPort;
    this._user = user;
    this._password = password;

    var authProvider = new cassandra.auth.PlainTextAuthProvider(this._user, this._password);
    client = new cassandra.Client({
            contactPoints: [this._dbHost],
            authProvider: authProvider,
            protocolOptions: {
                port: this._dbPort
            },
            keyspace: "test"       
    });
client.connect(function(err, result) {
    if (err) {
        console.log("Error while connecting to cassandra " + err)
    }
});
client.on('log', function(level, className, message, furtherInfo) {
  console.log('Cassandra log event: %s -- %s', level, message);
})
}


CassandraConnector.prototype.getAllUserPreferences = function(user_type, userId) {
    var query = "SELECT * from test.user where user_type=? AND user_id=?";
    var params = [user_type, userId];
    var deferred = Q.defer();
    client.execute(query, params, {
        prepare: true
    }, function(err, result) {
        if (err) {
            deferred.reject(err);
            throw new Error("Unable to retrieve the user preferences for user id " + userId);
        } else {
            deferred.resolve(result)
        }
    });
    return deferred.promise;
}

我在deferred.reject和deferred.resolve上放了一个断点，但它根本没有打到那里。请帮忙。