1.要求版本 node>8.0版本
2.database里面是数据库连接池信息
3.database下面有sql脚本，选择性的创建表在数据库中
4.routes/index.js 里面定义数据接口
5.初始化时需要安装依赖（yarn install || npm install）
6.测试数据库联通方式（需要在数据库中创建test表，然后insert一条数据用作测试），可以在浏览器输入地址 localhost:3000/test 有数据返回就说明数据库连接成功
pro_koa2_mysql's Introduction
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