来源：http://www.infoshare.cc/
1、下载以.dmg结尾mysql安装包
mysql下载地址：http://dev.mysql.com/downloads/mysql/
安装过程中，会有一个弹窗提示，注意：XXX的位置是你的初始登录密码
2016-08-17T15:58:04.890314Z 1 [Note] A temporary password is generated for root@localhost: XXX
If you lose this password, please consult the section How to Reset the Root Password in the MySQL reference manual.
2、安装完成之后，设置系统变量，
vim /etc/profile
export PATH=$PATH:/usr/local/mysql/bin/
3、打开电脑-》系统偏好设置-》Start MySQL Server
启动服务
4、发现登录之后，查询命令输入无用，
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
bash-3.2# mysql -u root -p
Enter password: XXX（初始登录密码）
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
bash-3.2# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2538
Server version: 5.7.14
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> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> select version(),current_date;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
5、所以你必须重设登录密码
mysql> SET PASSWORD = PASSWORD('你自己设置的密码');
Query OK, 0 rows affected, 1 warning (0.03 sec)
mysql> ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
Query OK, 0 rows affected (0.03 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)