zoukankan      html  css  js  c++  java
  • ORMmysql

    创建表,需要手动先创建数据库

    from sqlalchemy.ext.declarative import declarative_base
    from sqlalchemy import Column,Integer,String,ForeignKey
    from sqlalchemy import create_engine
    
    Base = declarative_base()
    class userinfo(Base):
        __tablename__ = "user_test"
        id = Column(Integer,primary_key=True,autoincrement=True)
        name = Column(String(32),nullable=True)
        age = Column(Integer,default=12,index=True)
        work = Column(String(32))
    
    
    engine = create_engine("mysql+pymysql://xiao:123123@42.193.197.149:3306/userinfo?charset=utf8")
    Base.metadata.create_all(engine)

     添加外键

    from sqlalchemy.ext.declarative import declarative_base
    from sqlalchemy import Column,Integer,String,ForeignKey
    from sqlalchemy import create_engine
    
    Base = declarative_base()
    
    class teacher(Base):
        __tablename__ = "teacher"
        tid = Column(Integer,primary_key=True)
        tname = Column(String(32))
    class course(Base):
        __tablename__ = "course"
        cid = Column(Integer,primary_key=True)
        cname = Column(String(32))
        tearch_id = Column(Integer,ForeignKey("teacher.tid"))
    
    engine = create_engine("mysql+pymysql://xiao:123123@42.193.197.149:3306/userinfo?charset=utf8")
    Base.metadata.create_all(engine)

     删除表

     对数据的操作:

    插入数据

    from sqlalchemy import create_engine
    from sqlalchemy.orm import sessionmaker,relationship
    Base = declarative_base()
    class userinfo(Base):
        __tablename__ = "user_test"
        id = Column(Integer,primary_key=True,autoincrement=True)
        name = Column(String(32),nullable=True)
        age = Column(Integer,default=12,index=True)
        work = Column(String(32))
    
    
    engine = create_engine("mysql+pymysql://xiao:123123@42.193.197.149:3306/userinfo?charset=utf8")
    Session = sessionmaker(bind=engine)
    session = Session() 
    obj1 = [userinfo(name="xiao",age=20,work="IT"),userinfo(name="liucui",age=18,work="docker")]
    session.add_all(obj1)  # 添加多行数据,  add 表示添加一条数据
    session.commit()       # 提交
    session.close()

     查看数据

    from sqlalchemy.ext.declarative import declarative_base
    from sqlalchemy import Column,Integer,String,ForeignKey
    from sqlalchemy import create_engine
    from sqlalchemy.orm import sessionmaker,relationship
    Base = declarative_base()
    class userinfo(Base):
        __tablename__ = "user_test"
        id = Column(Integer,primary_key=True,autoincrement=True)
        name = Column(String(32),nullable=True)
        age = Column(Integer,default=12,index=True)
        work = Column(String(32))
    
    
    engine = create_engine("mysql+pymysql://xiao:123123@42.193.197.149:3306/userinfo?charset=utf8")
    Session = sessionmaker(bind=engine)
    session = Session()
    #obj1 = [userinfo(name="xiao",age=20,work="IT"),userinfo(name="liucui",age=18,work="docker")]
    #session.add_all(obj1)  # 添加多行数据,  add 表示添加一条数据
    ret = session.query(userinfo).all()
    print(ret) # 返回每列为一个对象[<__main__.userinfo object at 0x000001F5D7EC9D30>, <__main__.userinfo object at 0x000001F5D7EC9580>]
    for row in ret:
        print(row.id,row.name,row.age,row.work)
    
    #session.commit()       # 提交
    session.close()

     where 条件查看

    ret = session.query(userinfo.id,userinfo.name).filter(userinfo.id > 1).all()
    print(ret) # 返回每列为一个对象[<__main__.userinfo object at 0x000001F5D7EC9D30>, <__main__.userinfo object at 0x000001F5D7EC9580>]
    for row in ret:
        print(row.id,row.name)
  • 相关阅读:
    游戏服务器的架构演进(完整版)阅读新得
    蚂蚁金服 11.11:支付宝和蚂蚁花呗的技术架构及实践阅读新得
    河北科技创新平台年报系统涉众分析
    问题账户需求分析
    2018年春季个人阅读计划
    2月26日毕设进度
    2月25日毕设进度
    2月24日毕设进度
    2月23日毕设进度
    2月22日毕设进度
  • 原文地址:https://www.cnblogs.com/huxl1/p/15707434.html
Copyright © 2011-2022 走看看