1、对于前者ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)这个错误，一般是mysql服务没开，
命令行下执行sudo /Library/StartupItems/MySQLCOM/MySQLCOM restart即可。
或者按照下面的步骤也可以：
打开文件 vi ~/.bash_profile
文件内粘帖下面的代码
# mysql
alias mysql='/usr/local/mysql/bin/mysql'
alias mysqladmin='/usr/local/mysql/bin/mysqladmin'
# ls
alias ls='ls -G'
保存并退出 esc + :wq
source ~/.bash_profile 确定生效
后尝试直接输入mysql发现可以登陆进去，见下面的代码事例
$ sudo /Library/StartupItems/MySQLCOM/MySQLCOM restart
Restarting MySQL database server
$ mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.25 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, 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.
mysql>
但是此时执行
select user();
发现登陆者只是普通用户，并非root,然后怎么办呢？
2、重新设置root密码，(标红命令直接输入回车后打开终端直接登陆)
安装navicat或其他客户端
苹果->系统偏好设置->最下边点mysql 在弹出页面中 关闭mysql服务
终端输入 cd /usr/local/mysql/bin/
回车输入sudo su
再回车后输入以下命令来禁止mysql验证功能 ./mysqld_safe –skip-grant-tables &
再回车后mysql会自动重启，重启好了之后打开navicat，这时候就可以不需要密码登录。直接修改root密码后重新启动MySQL即可。
然后？都到这一步了你还问我然后？想干什么就是你的事了，哈哈。。
我们终端测试下结果如何(上面密码我就设置为简单的123)：
$ mysql -uroot -p123
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 87
Server version: 5.6.25 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, 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.
mysql>select user();
+--------+
| user() |
+--------+
| root@ |
+--------+
1 row in set (0.00 sec)
ok，大功告成！
