sqlalchemy简单示例

1、初始化数据库database.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Created by miaoshuijian on 2017/3/13

from sqlalchemy import create_engine, MetaData
from sqlalchemy.orm import scoped_session, sessionmaker
# print MOIRAI_DB_CONNECT_STRING
engine = create_engine('mysql+pymysql://root:@127.0.0.1:3306/secdev?charset=utf8')
metadata = MetaData()
db_session = scoped_session(sessionmaker(autocommit=False,
                                         autoflush=False,
                                         bind=engine))
def init_db():
    metadata.create_all(bind=engine)

def shutdown_session(exception=None):
    db_session.remove()

2、

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Created by miaoshuijian on 2017/3/13

from sqlalchemy import Table, Column, Integer, String
from sqlalchemy.orm import mapper
from database import metadata, db_session


class User(object):
    query = db_session.query_property()
    def __init__(self, name=None, email=None):
        self.name = name
        self.email = email
    def __repr__(self):
        return '<User %r>' % (self.name)

users = Table('users', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String(50), unique=False),
    Column('email', String(120), unique=False)
)
mapper(User, users)

3、操作：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Created by miaoshuijian on 2017/3/13

from database import init_db, db_session, shutdown_session
from models import User



if __name__=='__main__':
    init_db()
    u = User('admin', 'admin@localhost')
    db_session.add(u)
    db_session.commit()
    print User.query.all()
    print User.query.filter(User.name == 'admin').first()
    shutdown_session()