code: public Observable<DatabaseInner> createOrUpdateAsync(String resourceGroupName, String serverName, String databaseName, DatabaseInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, databaseName, parameters).map(new Func1<ServiceResponse<DatabaseInner>, DatabaseInner>() {
              @Override
              public DatabaseInner call(ServiceResponse<DatabaseInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates a new database or updates an existing database.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param databaseName The name of the database.
  @param parameters The required parameters for creating or updating a database.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request