sqlalchemy tornado

cooler1217

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#-*- encoding: utf-8 -*-
'''
Created on 2014-12-3

@author: cooler
'''
import tornado.ioloop
import tornado.web

# sqlalchemy 使用  
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy import Column
from sqlalchemy.types import CHAR, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import func, or_, not_

BaseModel = declarative_base()

def init_db():
    BaseModel.metadata.create_all(engine)
def drop_db():
    BaseModel.metadata.drop_all(engine)

class User(BaseModel):
    __tablename__ = 'user'
    id = Column(Integer, primary_key=True)
    name = Column(CHAR(30)) # or Column(String(30))


#-------------------------------------------------------------------------------------


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        # self.write('<html><body><form action="/" method="post">'
        #            '<input type="text" name="message">'
        #            '<input type="submit" value="Submit">'
        #            '</form></body></html>')
        DB_CONNECT_STRING = 'mysql+mysqldb://cooler:cooler@localhost/testsqlalchemy?charset=utf8'
        engine = create_engine(DB_CONNECT_STRING, echo=True)
        DB_Session = sessionmaker(bind=engine)
        session = DB_Session()

        # user = User(name='a')
        # session.add(user)
        # user = User(name='b')
        # session.add(user)
        # user = User(name='a')
        # session.add(user)
        # user = User()
        # session.add(user)
        # session.commit()
        query = session.query(User)
        #-------------------------------------------
        # print query # 显示SQL 语句
        # print query.statement # 同上
        # for user in query: # 遍历时查询
        #     print user.name
        #---------------------------------------------
        # print query.all() 
        #---------------------------------------------
        # print query.first().name # 记录不存在时，first() 会返回 None
        # print query.one().name # 不存在，或有多行记录时会抛出异常
        # print query.filter(User.id == 2).first().name
        # print query.get(2).name # 以主键获取，等效于上句
        # print query.filter('id = 2').first().name # 支持字符串

        self.write()

application = tornado.web.Application([
    (r"/", MainHandler),
],debug=True)

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

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