准备用用tornado重写本站，但发现import tornado.database时出错。
[root@lee ~]# python
Python 2.7.4 (default, Apr 11 2013, 17:08:33)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tornado.web
>>> import tornado.database
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named database
>>>
网上不少教程明明写的是这个模块，怎么会提示找不到这个模块呢？难道我没有安装MySQLdb的原因？
[root@lee tornado]# python
Python 2.7.4 (default, Apr 11 2013, 17:08:33)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
>>>
MySQLdb模块已经装好了，看来不是MySQLdb模块引起的。我又重装了一次tornado，结果还是没有database模块。
Python的模块就是一个py文件，我倒tornado目录去看了看，果然没有database.py这个模块：
[root@lee ~]# find /usr -name tornado
/usr/lib/python2.6/site-packages/tornado-3.0.1-py2.6.egg/tornado
/usr/local/lib/python2.7/site-packages/tornado-3.0.1-py2.7.egg/tornado
/usr/local/lib/python2.7/site-packages/tornado
[root@lee ~]# cd /usr/local/lib/python2.7/site-packages/tornado
[root@lee tornado]# ls
auth.py escape.pyc __init__.pyc netutil.pyc tcpserver.py web.pyc
auth.pyc gen.py ioloop.py options.py tcpserver.pyc websocket.py
autoreload.py gen.pyc ioloop.pyc options.pyc template.py websocket.pyc
autoreload.pyc httpclient.py iostream.py platform template.pyc wsgi.py
ca-certificates.crt httpclient.pyc iostream.pyc process.py test wsgi.pyc
concurrent.py httpserver.py locale.py process.pyc testing.py
concurrent.pyc httpserver.pyc locale.pyc simple_httpclient.py testing.pyc
curl_httpclient.py httputil.py log.py simple_httpclient.pyc util.py
curl_httpclient.pyc httputil.pyc log.pyc stack_context.py util.pyc
escape.py __init__.py netutil.py stack_context.pyc web.py
[root@lee tornado]#
于是到tornado官网看了看文档，原来是tornado3.0版本以后废除database模块，但推出了一个类似database的模块torndb，我看了下源码基本就是MySQLdb的简单封装。
下载torndb，https://github.com/bdarnell/torndb
安装：
[root@lee software]# unzip torndb-master.zip
Archive: torndb-master.zip
ab862d70f293304f3a37527dff549eb6818063f7
creating: torndb-master/
inflating: torndb-master/.gitignore
inflating: torndb-master/README.rst
creating: torndb-master/doc/
inflating: torndb-master/doc/Makefile
inflating: torndb-master/doc/conf.py
inflating: torndb-master/doc/index.rst
inflating: torndb-master/setup.py
inflating: torndb-master/torndb.py
inflating: torndb-master/tox.ini
[root@lee software]# cd torndb-master
[root@lee torndb-master]# ls
doc README.rst setup.py torndb.py tox.ini
[root@lee torndb-master]# python setup.py build
running build
running build_py
creating build
creating build/lib
copying torndb.py -> build/lib
[root@lee torndb-master]# python setup.py install
running install
running build
running build_py
running install_lib
copying build/lib/torndb.py -> /usr/local/lib/python2.7/site-packages
byte-compiling /usr/local/lib/python2.7/site-packages/torndb.py to torndb.pyc
running install_egg_info
Writing /usr/local/lib/python2.7/site-packages/torndb-0.1-py2.7.egg-info
[root@lee torndb-master]#
安装好了试试能不能倒入torndb模块
[root@lee torndb-master]# python
Python 2.7.4 (default, Apr 11 2013, 17:08:33)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import torndb
>>>
OK，搞定。
其实使用torndb与直接使用MySQLdb模块操作数据库都一样，看个人喜好
关于torndb的文档请看这里：http://torndb.readthedocs.org/en/latest/
