code: function(callback) {
          var self = this;
  
          var requestOptions = {
              uri: '/instances',
              endpoint: rackspace.Endpoints.CloudDatabases
          };
  
          this.authorizedRequest(requestOptions, function(err, res, body) {
              if (err || !body.instances) {
                  callback(err ? err : body);
                  return;
              }
  
              var instances = [];
  
              for (var i = 0; i < body.instances.length; i++) {
                  instances.push(new rackspace.DatabaseInstance(self, body.instances[i]));
              }
  
              callback(err, instances);
          });
      }
docs: @name Client.getDatabaseInstances
  
  @description getDatabaseInstances retrieves your list of database instances
  
  @param {Function}            callback    handles the callback of your api call