1.

JLSdeMacBook-Pro:~ jls$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

当进入mysql界面是报错,不要认为是不是mysql文件有问题了等等...其实是TMD就是没有启动mysql进程呢.....

#查看mysql 进程
JLSdeMacBook-Pro:~ jls$ ps -A|grep mysql
30061 ttys000    0:00.00 grep mysql

果真没启动。
好。。。那就启动吧。。。

#输入命令
mysql.server start
Starting MySQL
 SUCCESS! 
JLSdeMacBook-Pro:~ jls$ /usr/local/Cellar/mysql/5.7.18_1/bin/mysqld_safe: line 142: /usr/local/var/mysql/JLSdeMacBook-Pro.local.err: Permission denied
cat: /usr/local/var/mysql/JLSdeMacBook-Pro.local.pid: Permission denied
rm: /usr/local/var/mysql/JLSdeMacBook-Pro.local.pid: Permission denied
2017-12-15T03:11:38.6NZ mysqld_safe Fatal error: Can't remove the pid file:
/usr/local/var/mysql/JLSdeMacBook-Pro.local.pid.
Please remove the file manually and start /usr/local/Cellar/mysql/5.7.18_1/bin/mysqld_safe again;
mysqld daemon not started
/usr/local/Cellar/mysql/5.7.18_1/bin/mysqld_safe: line 142: /usr/local/var/mysql/JLSdeMacBook-Pro.local.err: Permission denied

什么鬼 还报错....
···

sudo mysql.server start
Starting MySQL
SUCCESS!
JLSdeMacBook-Pro:bin jls$ mysql -uroot -p123