sqlalchemy 的 ORM 与 Core 混合方式使用示例

from sqlalchemy import create_engine

engine = create_engine(‘sqlite:///:memory:‘,echo = True)

from sqlalchemy.orm import Session

session = Session(engine)

from sqlalchemy import MetaData

metadata = MetaData(engine)

from sqlalchemy import Table, Column, Integer, String, ForeignKey

users_table = Table(‘users‘, metadata,
  Column(‘id‘, Integer, primary_key = True),
  Column(‘name‘, String),
  Column(‘fullname‘, String),
  Column(‘password‘, String)
)

# metadata.create_all() # 方式一
users_table.create() # 方式二

class User(object):
    def __init__(self,name,fullname,password):
        self.name = name
        self.fullname = fullname
        self.password = password

    def __repr__(self):
        return "<User(‘%s‘,‘%s‘,‘%s‘)>" % (self.name, self.fullname, self.password)

from sqlalchemy.orm import mapper

mapper(User, users_table)

session.add(User(‘ed‘,‘Ed Jones‘,‘edspassword‘))
session.commit()

# 绑定数据库
from sqlalchemy import create_engine
engine = create_engine(‘sqlite:///:memory:‘,echo = True)


# 建立会话
from sqlalchemy.orm import Session
session = Session(engine)


# 元数据
from sqlalchemy import MetaData
metadata = MetaData(engine)


# 定义表
from sqlalchemy import Table, Column, Integer, String, ForeignKey
users_table = Table(‘users‘, metadata,
  Column(‘id‘, Integer, primary_key = True),
  Column(‘name‘, String),
  Column(‘fullname‘, String),
  Column(‘password‘, String)
)


# 创建表
# metadata.create_all() # 方式一
users_table.create() # 方式二


# 定义类
class User(object):
    def __init__(self,name,fullname,password):
        self.name = name
        self.fullname = fullname
        self.password = password

    def __repr__(self):
        return "<User(‘%s‘,‘%s‘,‘%s‘)>" % (self.name, self.fullname, self.password)

        
# 映射类、表
from sqlalchemy.orm import mapper
mapper(User, users_table)


# 然后，就可以使用会话对数据库进行操作
session.add(User(‘ed‘,‘Ed Jones‘,‘edspassword‘))
session.commit()