环境准备：
事先准备好rpm包：https://dev.mysql.com/downloads/mysql/5.7.html#downloads
安装MySQL5.7
> tar -xvf mysql-5.7.24-1.el7.x86_64.rpm-bundle.tar
> yum remove mysql-libs
> rpm -ivh mysql-community-common-5.7.24-1.el7.x86_64.rpm
> rpm -ivh mysql-community-libs-5.7.24-1.el7.x86_64.rpm
> rpm -ivh mysql-community-client-5.7.24-1.el7.x86_64.rpm
> rpm -ivh mysql-community-server-5.7.24-1.el7.x86_64.rpm
启动服务：
> systemctl start mysqld
查询默认密码：
> cat /var/log/mysqld.log | grep password
使用默认密码登录：
> mysql -u root -p
修改密码：
> use mysql;
> SET PASSWORD = PASSWORD('UMF@root@123');
> ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
> FLUSH PRIVILEGES;
允许远程连接：
> update user set host = '%' where user = 'root';
> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'UMF@root@123' WITH GRANT OPTION;
> FLUSH PRIVILEGES;
> exit;
> systemctl stop mysqld.service
无密码检查登录：
> vi /etc/my.cnf
在最后一行增加 skip-grant-tables 并保存
设置大小写敏感：
lower_case_table_names = 0时，mysql会根据表名直接操作，大小写敏感。
lower_case_table_names = 1时，mysql会先把表名转为小写，再执行操作。
> systemctl start mysqld.service
> mysql -h {ip} -P 3306 -u root -p
创建数据源
> create database dir_manager;
> use dir_manager;
> source {.sql文件目录}
