code: def validate(self) -> None:
      # Validate/populate model exists
      self._model = DatabaseDAO.find_by_id(self._model_id)
      if not self._model:
          raise DatabaseNotFoundError()
      # Check there are no associated ReportSchedules
  
      if reports := ReportScheduleDAO.find_by_database_id(
          self._model_id
      ):
          report_names = [report.name for report in reports]
          raise DatabaseDeleteFailedReportsExistError(
              _(
                  f"There are associated alerts or reports: {','.join(report_names)}"
              )
          )
      # Check if there are datasets for this database
      if self._model.tables:
          raise DatabaseDeleteDatasetsExistFailedError()
  
file_path: superset/superset/commands/database/delete.py
imports: import logging
  from typing import Optional
  from flask_babel import lazy_gettext
  from superset.commands.base import BaseCommand
  from superset.commands.database.exceptions import DatabaseDeleteDatasetsExistFailedError, DatabaseDeleteFailedError, DatabaseDeleteFailedReportsExistError, DatabaseNotFoundError
  from superset.daos.database import DatabaseDAO
  from superset.daos.exceptions import DAODeleteFailedError
  from superset.daos.report import ReportScheduleDAO
  from superset.models.core import Database
label_desc: Use image node_id 3 for calling the DeleteDatabaseCommand obj's underlying member method code with example usage: obj.validate() without return types