原來如此簡單：解決Mac上的Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
mac os上第一次使用mysql,果然出現了問題，安裝好mysql的dmg後，在終端輸入mysql,結果出現
hrfpc:~ hrf$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
這個錯誤
在網上搜到很多方法，不好使，然後查詢了官方文件
http://dev.mysql.com/doc/refman/5.7/en/can-not-connect-to-server.html
下面寫道
Here are some reasons the Can't connect to local MySQL server
-
mysqld is not running on the local host. Check your operating system's process list to ensure the mysqld process is present.
- 。。。
結果
hrfpc:~ hrf$ mysqld
mysqld: Can't change dir to '/usr/local/mysql-5.7.16-osx10.11-x86_64/data/' (Errcode: 13 - Permission denied)
最後，正確的方法：
hrfpc:~ hrf$ sudo mysqld_safe
2016-10-14T11:47:17.6NZ mysqld_safe Logging to '/usr/local/mysql/data/hrfpc.err'.
2016-10-14T11:47:17.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
然後mysqld服務就執行啦
此時，終於能夠開啟mysql:
hrfpc:etc hrf$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.7.16
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有時事情總是用最簡單的辦法解決