http://segmentfault.com/q/1010000000094608

同样的问题，先在网上搜了下其他人解决这个问题的方法，是去修改mysql.cnf文件添加mysql.sock文件路径，再搜了一下我的mac没有mysql.cnf，也没有mysql.sock文件。

在查看mysql的安装说明ReadMe.txt中有个启动方法

If you have installed the Startup Item, use this command:

 shell> sudo /Library/StartupItems/MySQLCOM/MySQLCOM start

 (ENTER YOUR PASSWORD, IF NECESSARY)

 (PRESS CONTROL-D OR ENTER "EXIT" TO EXIT THE SHELL)

If you don't use the Startup Item, enter the following command sequence:

 shell> cd /usr/local/mysql

 shell> sudo ./bin/mysqld_safe

 (ENTER YOUR PASSWORD, IF NECESSARY)

 (PRESS CONTROL-Z)

 shell> bg

 (PRESS CONTROL-D OR ENTER "EXIT" TO EXIT THE SHELL)

使用sudo的时候会让你输入你的登陆密码。

这样就可以启动

[chopin:~:22:47:07]$ sudo /Library/StartupItems/MySQLCOM/MySQLCOM start

Password:

Starting MySQL database server

[chopin:~:22:52:06]$ mysql

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.1.63 MySQL Community Server (GPL)

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.