What is the usage of nodejs then

npm install mysql

//引入数据库 var mysql=require('mysql'); //实现127.0.0.1本地链接 var DATABASE = "test"; var table='test' var connection = mysql.createConnection({ host:'127.0.0.1', user:'root', password:'root', port:'3306', database: DATABASE }); //修改数据 function updateMysqlToken(Id,Name,Path) { console.info('select Name====' + Name); console.info('select Path====' + Path); var Name = Name; var Path = Path; //主要是这里对Promise的使用，只有Promise才能使用.then return new Promise(function (resolve,reject){ //定义我们的sql var updateSql = 'UPDATE ' + table +' set Name = ?, Path = ?, where Id = ? '; //这里对应sql的字段 var updateParams = [Name,Path,Id]; //nodejs的执行 connection.query(updateSql,updateParams, function(err, rows, fields ) { if (err){ reject(err) } // console.log( `The solution is: ${rows.length } ` ); console.info(` the getRowByPkOne sql ${updateSql}`) if( !rows || rows.length == 0 ) resolve(null) else resolve(rows[0]) }) }) }

//引入js，这里是对数据库的连接配置 var Mysql = require('Mysql.js'); Mysql.updateMysql(Name,Path).then( //updateMysql修改这里返回的值是个object对象，所以我们需要对其进行JSON解析 function(message) { console.info('message===' + JSON.stringify(message)); } ) //将结果集返回给前端 res.send(result); }