一、mac下安装MysqL数据库

1.下载MysqL数据库

下载地址：访问MysqL的官网http://www.MysqL.com/downloads/,进行下载。

进入MysqL的下载界面（http://www.MysqL.com/downloads/MysqL/）

下载x86,64bit的dmg文件：直接选择最下面的“No thanks,just take me to downloads!”

2.安装MysqL数据库

打开MysqL安装包后，点击安装主程序pkg文件。

3.启动MysqL数据库

打开MysqL数据库文件方式，在系统偏好设置中打开，点击MysqL，start myserver,即可启动MysqL。

4.终端登录MysqL数据库：

my-u root -p

回车，默认密码为空。出现password后回车即可。

二、安装数据库后发现忘记了数据库密码

1.首先关闭MysqL数据库

系统偏好设置中关闭MysqL,stop myserver

2.进入安全模式

? bin sudo su
Password:
Sorry,try again.
Password:
sh-3.2# ./MysqLd_safe --skip-grant-tables &
[1] 3477
sh-3.2# 2017-06-27T08:32:37.6NZ MysqLd_safe Logging to '/usr/local/MysqL-5.7.18-macos10.12-x86_64/data/localhost.err'.
2017-06-27T08:32:37.6NZ MysqLd_safe Starting MysqLd daemon with databases from /usr/local/MysqL-5.7.18-macos10.12-x86_64/data
sh-3.2#

3.重新启动一个终端

~ my-u root -p
Enter password:
Welcome to the Mymonitor. Commands end with ; or \g.
Your Myconnection id is 16
Server version: 5.7.18 MyCommunity 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.

4.输入命令

MysqL> FLUSH PRIVILEGES;
Query OK,0 rows affected (0.06 sec)

5.重新设置密码

MysqL> SET PASSWORD FOR root@'localhost' = PASSWORD('root');
Query OK,0 rows affected,1 warning (0.02 sec)

6.再次输入命令

MysqL> FLUSH PRIVILEGES;
Query OK,0 rows affected (0.00 sec)