# -*- coding: utf-8 -*-
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import column,integer,string
from sqlalchemy.orm import sessionmaker
# 建立物件的基類:
base = declarative_base()
global engine
#建立資料庫表
defcreate_all_tables
(db_type,db_host,db_port,db_name,username,password,charset="utf8"):
global engine
if db_type.upper() == "mysql":
db_uri = "mysql+mysqldb://%s:%s@%s:%s/%s?charset=%s" % (username,password,db_host,db_port,db_name,charset)
engine = create_engine(db_uri,echo=true)
# 尋找base的所有子類，按照子類的結構在資料庫中生成對應的資料表資訊
base.metadata.create_all(engine)
#返回資料庫會話
defloadsession
(): session = sessionmaker(bind=engine)
session = session()
return session
class
user
(base):
__tablename__="user"
# 表的結構:
id = column(integer,primary_key=true)
username = column(string(50),nullable=false,default="noob")
password = column(string(50),nullable=false,default="123456")
gender = column(string(1),nullable=true,default=none)
def__init__
(self,id,username,password,gender = none):
self.id = id
self.username = username
self.password = password
self.gender = gender
if __name__=="__main__":
#建表create_all_tables("mysql","localhost",3306,"test","root","123456")
#獲取資料庫會話
session = loadsession()
#增加u1 = user(id=1,username="rose",password="aaaa",gender="f")
u2 = user(id=2, username="joe", password="bbbb",gender="m")
u3 = user(id=3, username="jack", password="bbbb", gender="m")
u4 = user(id=4, username="billy", password="cccc")
session.add(u1)
session.add(u2)
session.add(u3)
session.add(u4)
session.commit()
#刪除session.query(user).filter(user.id > 2, user.gender == none).delete()
session.commit()
#修改session.query(user).filter(user.username == "jack").update()
session.commit()
#查詢#查第一行
session.query(user.id,user.username,user.password).first()
#查所有行
session.query(user.id, user.username, user.password).all()
#根據id倒序並取前兩行
session.query(user).order_by(user.id.desc()).limit(2)
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