Mac下解决mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

打开mysql就是显示进程已完成，发现报错mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
上网搜索教程，没有一篇能完全按照步骤走下来，故记录一下操作过程。

第一步

打开系统偏好设置，关闭mysql的服务（Stop Mysql Serve）；

第二步

打开终端，输入

$ cd /usr/local/mysql/bin
$ sudo su 

然后命令行变成以sh-3.2#开头，接着输入命令

./mysqld_safe --skip-grant-tables &

以安全模式进入数据库中，执行成功会显示如下：

mysqld_safe Logging to '/usr/local/mysql/data/lyqdeMacBook-Pro.local.err'.
mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

第三步

新建一个终端，输入命令

/usr/local/mysql/bin/mysql

回车进入mysql，执行成功会显示如下：

Your MySQL connection id is 433
Server version: 5.7.19 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, 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>

接着输入

mysql> use mysql;

显示结果

Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> 

更新root密码

mysql> update user set authentication_string=password('你的新密码') where Host='localhost' and User='root';

执行成功如下：

Query OK, 1 row affected, 1 warning (0.02 sec)
Rows matched: 1  Changed: 0  Warnings: 1

退出mysql

mysql> exit;

第四步

杀死mysqld_safe进程，重启mysql。

主要参考此篇文章http://www.cnblogs.com/benbenzhu/p/5578162.html