大家好，我正在尝试在 Snow Leopard 上为 Rails 应用程序安装 64 位 MySQL。
我已经从 dmg 安装了它，我可以从命令行很好地访问 mysql。根据各种博客文章以及 Stack 上的其他主题，我关闭了 mysql，卸载了 mysql gem，然后尝试使用以下内容更新 gem：
sudo env ARCHFLAGS='-arch x86_64' gem install --verbose --no-rdoc --no-ri mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
这会产生以下结果：
GET 200 OK: http://gems.rubyforge.org/latest_specs.4.8.gz
Installing gem mysql-2.8.1
Downloading gem mysql-2.8.1.gem
GET 302 Found: http://gems.rubyforge.org/gems/mysql-2.8.1.gem
GET 200 OK: http://s3.amazonaws.com/gemcutter_production/gems/mysql-2.8.1.gem
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/COPYING
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/COPYING.ja
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/History.txt
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/Manifest.txt
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/README.txt
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/Rakefile
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/extconf.rb
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/mysql.c
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/extra/README.html
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/extra/README_ja.html
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/extra/tommy.css
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql.rb
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/tasks/gem.rake
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/tasks/native.rake
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/tasks/vendor_mysql.rake
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/test/test_mysql.rb
Building native extensions. This could take a while...
/usr/local/bin/ruby extconf.rb --with-mysql-config=/usr/local/mysql/bin/mysql_config
checking for mysql_ssl_set()... no
checking for rb_str_set_len()... no
checking for rb_thread_start_timer()... no
checking for mysql.h... yes
creating Makefile
make
gcc -I. -I. -I/usr/local/lib/ruby/1.8/universal-darwin8.0 -I. -DHAVE_MYSQL_H -I/usr/local/mysql/include -g -Os -arch x86_64 -fno-common -D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DIGNORE_SIGHUP_SIGQUIT -DDONT_DECLARE_CXA_PURE_VIRTUAL -fno-common -g -O2 -fno-common -pipe -fno-common -arch i386 -c mysql.c
cc -dynamic -bundle -undefined suppress -flat_namespace -arch i386 -L"/usr/local/lib" -o mysql_api.bundle mysql.o -lruby -L/usr/local/mysql/lib -lmysqlclient -lz -lm -lmygcc -lpthread -ldl -lobjc
ld: warning: in /usr/local/mysql/lib/libmysqlclient.dylib, file is not of required architecture
ld: warning: in /usr/local/mysql/lib/libmygcc.a, file is not of required architecture
make install
/usr/bin/install -c -m 0755 mysql_api.bundle /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib
Successfully installed mysql-2.8.1
1 gem installed
最后的这两个警告似乎是不祥的。然后我去我的rails应用程序并运行
rake db:migrate
并得到：
dyld: NSLinkModule() error
dyld: Symbol not found: _mysql_affected_rows
Referenced from: /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Expected in: flat namespace
in /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Trace/BPT trap
这就是我所能得到的。我尝试通过 dmg 和 macports 安装 MySQL，在这两种情况下我似乎都遇到了这个错误。
说到rails，我有点菜鸟。任何人都可以散发出的任何光芒将不胜感激。谢谢！
- - 编辑 - -
回应以下约翰（和凯尔）的回答：
当我执行 John 指定的第一个命令时，我得到：
No definition for next_result
No definition for field_name
No definition for field_table
这大概有40行。我认为这是因为文档。但是当我 rake db:migrate 我得到：
dyld: NSLinkModule() error
dyld: Symbol not found: _mysql_affected_rows
Referenced from: /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Expected in: flat namespace
in /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Trace/BPT trap
使用 ARCHFLAGS 命令会产生我之前指定的错误。
--- 第二次编辑 ---
我应该补充一点，我没有从源代码安装。再次查看 Hivelogic 说明后，我沿着这条路线走。
当我尝试运行时：
./configure --prefix=/usr/local/mysql --with-extra-charsets=complex \
--enable-thread-safe-client --enable-local-infile --enable-shared \
--with-plugins=innobase
我有：
config.status: creating zlib/Makefile
dyld: Library not loaded: /opt/local/lib/libintl.8.dylib
Referenced from: /opt/local/bin/gawk
Reason: no suitable image found. Did find:
/opt/local/lib/libintl.8.dylib: mach-o, but wrong architecture
./config.status: line 1782: 69228 Done(141) eval sed ç"ç$ac_sed_extraç" "$ac_file_inputs"
69229 Trace/BPT trap
所以我做了：
sudo port deactivate gettext
sudo port activate gettext @0.17_3
但是，在完成所有步骤之后，重新安装 gem，在 rake db:migrate 我仍然得到：
dyld: NSLinkModule() error
dyld: Symbol not found: _mysql_affected_rows
Referenced from: /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Expected in: flat namespace
in /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
Trace/BPT trap
---- 第三次编辑 ----
好的 - 我相信这里发生的事情是，即使我在上面指定了 64 位 gem，它也在安装 32 位版本。我愿意：
file /usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle
并得到：
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle: Mach-O bundle i386
所以看来我一直在安装 32 位版本