class_docstr: Base DAO, implement base CRUD sqlalchemy operations
class_docstr_tok: ["Base","DAO",",","implement","base","CRUD","sqlalchemy","operations"]
docstr: Update an object from the specified item and/or attributes.
  
  :param item: The object to update
  :param attributes: The attributes associated with the object to update
  :param commit: Whether to commit the transaction
  :raises DAOUpdateFailedError: If the updating failed
docstr_tok: ["Update","an","object","from","the","specified","item","and\/or","attributes",".",":","param","item",":","The","object","to","update",":","param","attributes",":","The","attributes","associated","with","the","object","to","update",":","param","commit",":","Whether","to","commit","the","transaction",":","raises","DAOUpdateFailedError",":","If","the","updating","failed"]
code: def update(
      cls,
      item: T | None = None,
      attributes: dict[str, Any] | None = None,
      commit: bool = True,
  ) -> T:
      """
      Update an object from the specified item and/or attributes.
  
      :param item: The object to update
      :param attributes: The attributes associated with the object to update
      :param commit: Whether to commit the transaction
      :raises DAOUpdateFailedError: If the updating failed
      """
  
      if not item:
          item = cls.model_cls()  # type: ignore  # pylint: disable=not-callable
  
      if attributes:
          for key, value in attributes.items():
              setattr(item, key, value)
  
      try:
          db.session.merge(item)
  
          if commit:
              db.session.commit()
      except SQLAlchemyError as ex:  # pragma: no cover
          db.session.rollback()
          raise DAOUpdateFailedError(exception=ex) from ex
  
      return item
  
file_path: superset/superset/daos/base.py
imports: from __future__ import annotations
  from typing import Any, Generic, get_args, TypeVar
  from flask_appbuilder.models.filters import BaseFilter
  from flask_appbuilder.models.sqla import Model
  from flask_appbuilder.models.sqla.interface import SQLAInterface
  from sqlalchemy.exc import SQLAlchemyError, StatementError
  from sqlalchemy.orm import Session
  from superset.daos.exceptions import DAOCreateFailedError, DAODeleteFailedError, DAOUpdateFailedError
  from superset.extensions import db
label_desc: Use image node_id 7 for calling the BaseDAO obj's underlying member method code with example usage: obj.update(cls, item, attributes, commit) and returns: item