详细说明mac使用homebrew安装MySQL无法登陆问题的处理方法

如果你电脑是Mac的，使用homebrew安装MySQL是一个非常便捷的方式，但是还是会出现一些问题；

首先保证你已经安装了mysql,如果是通过homebrew安装的，输入mysql.server start 启动服务

如果在输入

mysql -u root

出现这个错误ERROR 1045 (28000): Access denied for user 'zhongchengming'@'localhost' (using password: YES)，应该是修改初始密码没有成功

解决步骤

（1）终端输入mysqld_safe --skip-grant-tables 显示如下

2017-03-21T11:44:11.6NZ mysqld_safe Logging to '/usr/local/var/mysql/zhongchengmingdeMacBook-Air.local.err'.
2017-03-21T11:44:11.6NZ mysqld_safe Logging to '/usr/local/var/mysql/zhongchengmingdeMacBook-Air.local.err'.
2017-03-21T11:44:11.6NZ mysqld_safe A mysqld process already exists

（2）再次输入mysql -u root显示如下

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 5.7.17 Homebrew
Copyright (c) 2000, 2016, 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>

（3）终端输入 use mysql显示如下

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>

（4）修改密码UPDATE mysql.user SET authentication_string=PASSWORD('你的密码') WHERE User='root';

成功 Query OK, 1 row affected, 1 warning (0.05 sec)

Rows matched: 1 Changed: 1 Warnings: 1

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