node.js 连接数据库

var mysql = require("mysql");var TEST_DATABASE = "test";var TEST_TABLE = "user_data";var client = mysql.createConnection({user:"root",password:""});client.connect();client.query("use test");client.query("select * from user_data", function (err, rs, fields) {    if(err){        throw err;    }    if(rs){        for(var i = 0; i < rs.length; i++){            console.log("%d\t%s\t%s", rs[i].uid,rs[i].username,rs[i].password);        }    }})

npm install mysql