MySql 的安装 与connection
1. 下载mysql for mac: https://dev.mysql.com/downloads/mysql/
3. Continue -> Continue, Agree -> Install -> 输入管理员密码
4. 记录下来弹窗中的密码
5. 进入系统偏好设置, 找到mysql, 启动服务
6. 将mysql的命令添加到系统中
alias mysql=/usr/local/mysql/bin/mysql
alias mysqladmin=/usr/local/mysql/bin/mysqladmin
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或者：(1).进入/usr/local/mysql/bin,查看此目录下是否有mysql
(2).执行vim ~/.bash_profile
在该文件中添加mysql/bin的目录
PATH=$PATH:/usr/local/mysql/bin
添加完成后，按esc，然后输入wq保存。
(3).最后在命令行输入source ~/.bash_profile
7. 通过mysql -uroot -p登录mysql, 输入之前保存的密码
8. 重置mysql初始密码
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpassword');
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mysqladmin -u root -p password newpass
Enter password: 输入 你刚才弹框中的密码 会出来下面这段话--不用过管
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.
7. mysql -u root -p
Enter password: 输入 newpass 自己设置的
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 146
Server version: 5.7.21 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.09 sec)
mysql>
我是在终端 切换到 root 下删除的。切换root。sudo -i
MySQL的卸载一般使用终端的方式操作（安装包中有安装文件，但是没有卸载文件，只能通过终端命令的方式卸载）
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
vim /etc/hostconfig
：wq。回车 推出
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*
最后 mysql 图标消失
