Python：MySQLdb和“未加载库：libmysqlclient.16.dylib”

Question

设置…

试图设置一个干净的Mac OS X 10.6安装来开发python / django，我不记得在10.5上遇到过这个问题。

从mysql-5.5.8-osx10.6-x86_64.dmg我的安装程序安装MySQL后

$ sudo pip install MySQL-python

似乎进展顺利（以下输出）

Downloading/unpacking MySQL-python
  Downloading MySQL-python-1.2.3.tar.gz (70Kb): 70Kb downloaded
  Running setup.py egg_info for package MySQL-python
    warning: no files found matching 'MANIFEST'
    warning: no files found matching 'ChangeLog'
    warning: no files found matching 'GPL'
Installing collected packages: MySQL-python
  Running setup.py install for MySQL-python
    building '_mysql' extension
    gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -Dversion_info=(1,2,3,'final',0) -D__version__=1.2.3 -I/usr/local/mysql/include -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c _mysql.c -o build/temp.macosx-10.6-universal-2.6/_mysql.o -Os -g -fno-common -fno-strict-aliasing -arch x86_64
    In file included from _mysql.c:36:
    /usr/local/mysql/include/my_config.h:325:1: warning: "SIZEOF_SIZE_T" redefined
    In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:9,
                     from pymemcompat.h:10,
                     from _mysql.c:29:
    /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pymacconfig.h:33:1: warning: this is the location of the previous definition
    In file included from _mysql.c:36:
    /usr/local/mysql/include/my_config.h:419:1: warning: "HAVE_WCSCOLL" redefined
    In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:8,
                     from pymemcompat.h:10,
                     from _mysql.c:29:
    /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pyconfig.h:803:1: warning: this is the location of the previous definition
    gcc-4.2 -Wl,-F. -bundle -undefined dynamic_lookup build/temp.macosx-10.6-universal-2.6/_mysql.o -L/usr/local/mysql/lib -lmysqlclient_r -lpthread -o build/lib.macosx-10.6-universal-2.6/_mysql.so -arch x86_64
    warning: no files found matching 'MANIFEST'
    warning: no files found matching 'ChangeLog'
    warning: no files found matching 'GPL'
Successfully installed MySQL-python
Cleaning up...

在此之后，我尝试：

$ python -c "import MySQLdb"

它通过以下方式对我产生了负面影响：

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Library/Python/2.6/site-packages/MySQLdb/__init__.py", line 19, in <module>
    import _mysql
ImportError: dlopen(/Library/Python/2.6/site-packages/_mysql.so, 2): Library not loaded: libmysqlclient.16.dylib
  Referenced from: /Library/Python/2.6/site-packages/_mysql.so
  Reason: image not found

所以我的问题…

我做错了什么/我还需要做什么？

对此进行谷歌搜索（并在此处搜索）会返回很多结果，而使用Ruby会收到此错误消息，而使用Python则不会太多。

Answer 1

_mysql.so是指libmysqlclient.16.dylib。也就是说，充当Python和MySQL客户端库之间的桥梁的共享库是_mysql.so指MySQL客户端库的动态库，并且由于某种原因而无法加载该库。

您需要回答的问题：

• libmysqlclient.16.dylib您的系统上是否有任何地方？如果不是，则需要安装MySQL客户端软件。
• 如果是这样，您的DYLD_LIBRARY_PATH设置中是否包含该库的目录？如果不是，请尝试添加它。
• 如果是这样，则必须确保libmysqlclient.16.dylib文件未损坏。我的副本安装在/opt/local/lib/mysql5/mysql/libmysqlclient.16.dylibMacPorts的帮助下，具有MD5签名c79ee91af08057dfc269ee212915801a，大小为1,462,376字节。您的副本是什么样的？