code: function(id, callback) {
          var self = this;
  
          var requestOptions = {
              uri: '/instances/' + id,
              endpoint: rackspace.Endpoints.CloudDatabases
          };
  
          this.authorizedRequest(requestOptions, function(err, res, body) {
              if (err || !body.instance) {
                  callback(err ? err : body);
                  return;
              }
  
              callback(err, new rackspace.DatabaseInstance(self, body.instance));
          });
      }
docs: @name Client.getDatabaseInstance
  
  @description Gets the details for a specified database instance id
  
  @param {String}      id          the id of the requested database instance
  @param {Function}    callback    handles the callback of your api call