Sqlalchemy的查询方式

• 查询全部：

  类型为列表，返回值为对象，可以使用索引，res[2]

• 查询指定条件：

  类型是个对象，返回值是个sql语句，不可以使用索引

• 查询指定字段：

  类型是个对象，返回值是个sql语句

Sqlalchemy的查询结果类型及返回值都有哪些区别？

• 查询全部，查询实体类里面的所有数据，也就是查询UplineRecord表的所有数据，返回的类型是列表里面嵌套对象

• def query():
      # 查询全部------查询实体类里面的所有数据，也就是查询UplineRecord表的所有数据
       --------------类型为列表，返回值为对象（返回的是实体类里的对象，即数据库里的数据，）
      res = session.query(UplineRecord).all()
      print("类型", type(res))
      print("返回值:", res)
  if __name__ == '__main__':
      print(query())
  
  #打印结果
  类型 <class 'list'>
  返回值: [<entity.Associated_database.UplineRecord object at 0x00000171A1AC5120>]
  
  def query(id):
      # 查询指定条件，类型是个对象，返回值是个sql语句
      res = session.query(UplineRecord).filter(UplineRecord.id == id)
      print("类型", type(res))
      print("返回值:", res)
  if __name__ == '__main__':
      print(query(50))
  #打印结果
  类型 <class 'sqlalchemy.orm.query.Query'>
  返回值: SELECT upline_record.id AS upline_record_id, upline_record.service_group AS upline_record_service_group, upline_record.application_name AS upline_record_application_name, upline_record.online_version AS upline_record_online_version, upline_record.work_order AS upline_record_work_order, upline_record.requirement AS upline_record_requirement, upline_record.developer AS upline_record_developer, upline_record.tester AS upline_record_tester, upline_record.test_report_id AS upline_record_test_report_id, upline_record.`sql` AS upline_record_sql, upline_record.apollo AS upline_record_apollo, upline_record.emergency_online AS upline_record_emergency_online, upline_record.`status` AS upline_record_status, upline_record.`delete` AS upline_record_delete, upline_record.online_time AS upline_record_online_time, upline_record.create_time AS upline_record_create_time, upline_record.update_time AS upline_record_update_time, upline_record.dingding_notification AS upline_record_dingding_notification
  FROM upline_record
  WHERE upline_record.id = %(id_1)s
  
  # 对查询结果进行数据解析
  def query():
      # 查询所有
      res = session.query(UplineRecord).all()
  
     #第一种解析方式，查询结果是list里面嵌套多个对象，可对对象进行循环处理，获取到的每个结果在丢入到列表中，在返回这个列表中的内容
      test_item = [item.to_dict() for item in res]
      return test_item
  
     #第二种解析方式
      list = []
      for i in res:
           list.append(i.to_dict())
       return list
  if __name__ == '__main__':
      print(query())