SQLAlchemy 使用

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原文链接：http://www.cnblogs.com/jinjin666/archive/2013/01/28/2879546.html

文章标签：

#数据库 #python

本文介绍如何使用SQLAlchemy ORM进行数据库操作，包括安装配置过程及示例代码，演示了如何定义模型类并执行增删改查等基本操作。

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因为有用到所以记录一下呵呵

使用SQLAlchemy 这种ORM的方式操作数据库

关于ORM的介绍具体可以参见 http://en.wikipedia.org/wiki/Object-relational_mapping

SQLAlchemy 官网：http://www.sqlalchemy.org/

安装方式：从源码包安装或者 easy_install SQLAlchemy(不得不说用包安装真是方便啊不用自己去安装各种依赖包)

安装mysql ap i: apt-get install python-mysqldb

使用的一个demo

 1 #!/usr/bin/env python
 2 from   sqlalchemy import *
 3 from sqlalchemy import create_engine
 4 from sqlalchemy.ext.declarative import declarative_base
 5 from sqlalchemy import Column, Integer, String, ForeignKey
 6 from sqlalchemy import distinct
 7 from sqlalchemy.orm import sessionmaker
 8 #engine = create_engine('mysql://root:nosql@localhost/serverlist', echo=False)
 9 
10 engine = create_engine('mysql://users:passwd@localhost/videoupload', connect_args={'charset':'utf8'},echo=False)
11 Base = declarative_base()
12 Session = sessionmaker(bind=engine)
13 session = Session()
14 
15 class VideoUpload(Base):
16     __tablename__ = 'videoupload'
17     num      = Column(Integer, primary_key=True)
18     vid      = Column(String)
19     filepath = Column(String)    
20     sourceip = Column(String)
21     state    = Column(String)
22     snapshot = Column(String)
23     
24     
25     def __init__(self,vid='',filepath='',sourceip='',state='',snapshot=''):
26         self.vid      = vid
27         self.filepath = filepath
28         self.sourceip = sourceip
29         self.state    = state 
30         self.snapshot = snapshot
31 
32 
33 class FailVideoUpload(Base):
34     __tablename__ = 'fail_videoupload'
35     num               = Column(Integer, primary_key=True)
36     file_path         = Column(String)
37     file_name         = Column(String)
38     file_content_type = Column(String)
39     file_size         = Column(String)
40 
41     def __init__(self,file_path='',file_name='',file_content_type='',file_size=''):
42         self.file_path          = file_path
43         self.file_name          = file_name
44         self.file_content_type  = file_content_type
45         self.file_size          = file_size 
46      
47         
48         
49 if __name__ == '__main__':
50     #pVideoupload = VideoUpload()
51     #pVideoupload.insert().values(vid='123',sourceip='123',state='true',)
52     my_vp = VideoUpload('test', 'true', 'true','sdf')
53     my_fvp = FailVideoUpload('/home','123','jpg','123')
54     session.add(my_vp)
55     session.add(my_fvp)
56     session.commit()