restwo=conn.execute(sqltwo)print(restwo.fetchall())#[('change_name', 'rain')]#查询user表的name,并按照条件排序,按照名字排序sqlorder =select([user.c.name]).order_by(user.c.name) resorder=conn.execute(sqlorder)print(resorder.fetchall())#[('change_name',), ('yxy 0',), ('yxy 1...
由于bulk_insert_mappings在 SQLAlchemy 的异步版本中可能不直接支持,你可以使用add_all方法来批量添加对象。 asyncdefsave_import(self, data: List[DtoType], db: AsyncSession) ->bool:"""批量导入对象"""try:#将 DTO 转换为模型实例db_objs = [self.model(**obj_in.model_dump())forobj_inindata]#...
使用where 的示例(SQLAlchemy Core): from sqlalchemy.future import select from sqlalchemy.ext.asyncio import AsyncSession async def get(self, id: int, db: AsyncSession) -> Optional[ModelType]: query = select(self.model).where(self.model.id == id) result = await db.execute(query) return ...
# s.execute('INSERT INTO users (name, age, password) VALUES (?, ?, ?)',('bigpang',2,'1122121')) # 这样执行报错 # s.execute('INSERT INTO users (name, age, password) VALUES (:aa, :bb, :cc)',({'aa':'bigpang2','bb':22,'cc':'998'})) # s.commit() # 这样执行成功 r...
SQLAlchemy: 使用ForeignKey对象来表示。 对应关系: 在SQLAlchemy中使用ForeignKey指定关系,指向另一个表的主键列。 from sqlalchemy import ForeignKey from sqlalchemy.orm import relationship class Address(Base): __tablename__ = 'addresses' id = Column(Integer, primary_key=True) ...
nickname = %(nickname_1)s 2023-08-18 21:55:34,219 INFO sqlalchemy.engine.Engine [generated in 0.00086s] {'id_1': 18, 'nickname_1': 'chao30'} [<User(id=136, username=廖波, nickname=chao30)>] 原生sql和sql表达式 from sqlalchemy import text # 执行原生的sql session.execute(text("...
create_engine 函数并会不真正建立数据库的 DB-API 连接,当调用 Engine.execute() 或 Engine.connect() 方法时才会建立连接。大多数情况下我们无需关注 Engine,SQLAlchemy 会帮我们处理。 创建数据库表 将python 类映射到数据库表上,这个 Python 类需要时一个指定基类的子类,这个基类应当含有ORM映射中相关的类和...
SQL_QUERY_ONE_DATA = "SELECT * FROM PEOPLE WHERE id={}" def query_one(self, id): """ 查询一条数据 :param id: :return: """ self.cursor.execute(SQL_QUERY_ONE_DATA.format(id)) # fetchone():查询第一条数据 # fetchall():查询所有数据 # fetchmany(1):查询固定的数量的数据 result ...
Major SQLAlchemy features include: An industrial strength ORM, built from the core on the identity map, unit of work, and data mapper patterns. These patterns allow transparent persistence of objects using a declarative configuration system. Domain models can be constructed and manipulated naturally,...