var mysql = require('mysql');
var config = require("../config");
class Db {

    constructor () {
        // 创建数据库连接
        this.pool = mysql.createPool(config.mysql)
    }


    query(data) {
       return new Promise((resolve, reject) => {
        this.pool.query(data.sql, data.params, function (error, results, fields) {
            if (error) throw error;
            resolve(results);
        });
       })
    }

}

module.exports = new Db()