code: def import_obj(cls, i_datasource, import_time=None):
          
          def lookup_sqlatable(table):
              return db.session.query(SqlaTable).join(Database).filter(
                  SqlaTable.table_name == table.table_name,
                  SqlaTable.schema == table.schema,
                  Database.id == table.database_id,
              ).first()
  
          def lookup_database(table):
              return db.session.query(Database).filter_by(
                  database_name=table.params_dict['database_name']).one()
          return import_datasource.import_datasource(
              db.session, i_datasource, lookup_database, lookup_sqlatable,
              import_time)
docs: Imports the datasource from the object to the database.
  
           Metrics and columns and datasource will be overrided if exists.
           This function can be used to import/export dashboards between multiple
           superset instances. Audit metadata isn't copies over.