ORM
Object Relational Mapping 对象关系映射
Table => Object, 简化 SQL 查询命令的编写
https://en.wikipedia.org/wiki/Object-relational_mapping
https://stackoverflow.com/questions/1279613/what-is-an-orm-how-does-it-work-and-how-should-i-use-one
sequelize
sequelize-cli
https://github.com/sequelize/sequelize