68 lines
2.8 KiB
Python
68 lines
2.8 KiB
Python
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from sqlalchemy import *
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from sqlalchemy.orm import declarative_base,sessionmaker
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from datetime import datetime
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db_url = "mysql+pymysql://root:123456@127.0.0.1:3306/ai0824?charset=utf8mb4"
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engine = create_engine(db_url # 连接地址
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,pool_size=50 # 连接池，同时可以保持50个已经创建好的数据库连接，放在池子里缓存使用
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,echo=True
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)
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Base = declarative_base()
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class Order(Base): # python里的表名字
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__tablename__ = 'order_info_detail' # 实际数据库的表名字
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id = Column( Integer # 声明字段的数据类型
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, primary_key=True # 声明是主键
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, autoincrement=True # 声明是自增主键
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, comment='订单编号，自增主键' # 注释
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)
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title = Column( String(50) # 对应数据库的varchar类型
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,nullable=False # 不允许为null
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)
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acc = Column(Integer)
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userid = Column( Integer,ForeignKey('user_info_detail.id'),nullable=False ) # 外键约束
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create_date = Column(DATETIME
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, default=datetime.now # 默认值是当前时间
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)
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update_date = Column(DATETIME
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, default=datetime.now # 首次创建的时间跟更新时间一致
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, onupdate=datetime.now
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)
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class User(Base): # python里的表名字
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__tablename__ = 'user_info_detail' # 实际数据库的表名字
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id = Column(Integer # 声明字段的数据类型
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, primary_key=True # 声明是主键
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, autoincrement=True # 声明是自增主键
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, comment='用户编号，自增主键' # 注释
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)
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usernmae = Column(String(50) # 对应数据库的varchar类型
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, nullable=False # 不允许为null
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, comment='用户名'
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)
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create_date = Column(DATETIME
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, default=datetime.now # 默认值是当前时间
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)
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update_date = Column(DATETIME
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, default=datetime.now # 首次创建的时间跟更新时间一致
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, onupdate=datetime.now
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)
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Base.metadata.create_all(engine)
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# User.__table__.create(engine,checkfirst = True)
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u1 = User(usernmae='清华')
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session = sessionmaker(bind=engine
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,autoflush=False
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,autocommit=False
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)
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db = session()
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db.add(u1)
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db.commit()
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db.close()
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n = 4 # 页数
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m = 2 # 每页数据量
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r6 = db.query(User).offset((n-1)*m).limit(m).all()
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for i in r6:
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print('分页：', i.id, i.usernmae)
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