mac os 上安装mysqldb，EnvironmentError: mysql_config not found

要在mac os上安装 mysqldb

首先，下载MySQLdb：http://sourceforge.net/projects/mysql-python/

下载MySQL-python-1.2.3.tar.gz

解压，运行setup.py：

python setup.py install

报错：

sh: mysql_config: command not found
Traceback (most recent call last):
  File "setup.py", line 15, in <module>
    metadata, options = get_config()
  File "/Users/***/Downloads/MySQL-python-1.2.3/setup_posix.py", line 43, in get_config
    libs = mysql_config("libs_r")
  File "/Users/***/Downloads/MySQL-python-1.2.3/setup_posix.py", line 24, in mysql_config
    raise EnvironmentError("%s not found" % (mysql_config.path,))
EnvironmentError: mysql_config not found

参考：http://www.southsearepublic.org/article/2416/read/environmenterror_mysql_config_not_found/installing_mysqldb_for_python_on_mac_osx/

发现要修改site.cfg

mysql_config = /usr/local/mysql/bin/mysql_config

让mysql_config指向mysql在mac os中的安装位置。

之后再用高权限运行

sudo python setup.py install

如果运行的时候，还有问题：

>>> import MySQLdb
/Library/Python/2.7/site-packages/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /Library/Python/2.7/site-packages/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg/_mysql.pyc, but /Users/***/Downloads/MySQL-python-1.2.3 is being added to sys.path
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "MySQLdb/__init__.py", line 19, in <module>
    import _mysql
  File "build/bdist.macosx-10.7-intel/egg/_mysql.py", line 7, in <module>
  File "build/bdist.macosx-10.7-intel/egg/_mysql.py", line 6, in __bootstrap__
ImportError: dlopen(/Users/***/.python-eggs/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg-tmp/_mysql.so, 2): Library not loaded: libmysqlclient.18.dylib
  Referenced from: /Users/***/.python-eggs/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg-tmp/_mysql.so
  Reason: image not found

那么就需要解决动态引入的问题了（重新做一遍，并且设置环境变量）：

$ sudo python setup.py clean

$ sudo python setup.py build

$ sudo python setup.py install

$ export DYLD_LIBRARY_PATH=/usr/local/mysql/lib:$DYLD_LIBRARY_PATH

$python

>>> import MySQLdb
/Library/Python/2.7/site-packages/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /Library/Python/2.7/site-packages/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg/_mysql.pyc, but /Users/***/Downloads/MySQL-python-1.2.3 is being added to sys.path

>>> conn=MySQLdb.connect(host="localhost",user="root",passwd="root",db="mysql")
>>> cursor =conn.cursor()
>>> sql ="select * from user"
>>> cursor.execute(sql)
7L
>>> row=cursor.fetchone()
>>> print row
('localhost', 'root', '*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', '', '', '', '', 0L, 0L, 0L, 0L, '', '')

能够读取mysql.user表的信息了，说明已经mysqldb已经安装成功。

参考：http://stackoverflow.com/questions/1465846/install-mysqldb-on-snow-leopard/6537345#6537345

如果还是在eclipse中有问题，那就采用这里的办法 http://yanghao.org/blog/archives/76

解决办法： eclipse->偏好设置->Pydev->Interpreter-Python->Environment里面增加下面内容，看图：

现在可以运行带有mysqldb的脚本了，不过还是有红叉，很不爽啊！！