Node+Express+MySql实现简单增删改查和登录

摘要：链接数据库创建编码解析方法设置跨域访问登录登陆失败登陆成功查询修改修改成功添加添加成功删除删除成功配置服务端口

var express = require("express");
var mysql = require("mysql");
var app = express();
var bodyParser = require("body-parser");
//链接数据库
var connection = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "123456",
    database: "school"
});
connection.connect();
// 创建 application/x-www-form-urlencoded 编码解析(post方法)
var urlencodedParser = bodyParser.urlencoded({ extended: false })
//设置跨域访问
app.all("*", function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
    res.header("Content-Type", "application/json;charset=utf-8");
    next();
});
//登录
app.post("/login",urlencodedParser, function (req, res) {
    var username = req.body.username;
    var password = req.body.password;
    var sql = `select * from login where username = "${username}" and password = "${password}"`;
    connection.query(sql, function (err, result) {
        console.log(result)
        if (err || result.length == 0) {
            res.status(200),
                res.json("登陆失败")
        } else {
            res.status(200),
                res.json("登陆成功")
        }
    });
})

//查询
app.get("/query", function (req, res) {
    var sql = "select * from student";
    connection.query(sql, function (err, result) {
        if (err) {
            console.log("err:", err.message);
        }
        console.log(result);
        res.status(200),
            res.json(result)
    });
});
//修改
app.get("/change", function (req, res) {
    var SNO = req.query.SNO;
    var SNAME = req.query.SNAME;
    var SDEPT = req.query.SDEPT;
    var sql = `update student set SNAME = "${SNAME}",SDEPT = "${SDEPT}" where SNO = "${SNO}"`;
    connection.query(sql, function (err, result) {
        if (err) {
            console.log("err:", err.message);
        }
        console.log(result);
        res.status(200),
            res.json("修改成功")
    });
})
//添加
app.get("/add", function (req, res) {
    console.log(req.query)
    var SNO = req.query.SNO;
    var SNAME = req.query.SNAME;
    var SDEPT = req.query.SDEPT;
    var sql = `insert into student values ("${SNO}","${SNAME}","${SDEPT}")`;
    connection.query(sql, function (err, result) {
        if (err) {
            console.log("err:", err.message);
        }
        console.log(result);
        res.status(200),
            res.json("添加成功")
    });
})
//删除
app.get("/delete", function (req, res) {
    console.log(req.query)
    var SNO = req.query.SNO;
    var sql = `delete from student where SNO="${SNO}"`;
    connection.query(sql, function (err, result) {
        if (err) {
            console.log("err:", err.message);
        }
        console.log(result);
        res.status(200),
            res.json("删除成功")
    });
})

// connection.end();

//配置服务端口
var server = app.listen(8080, function () {
    var host = server.address().address;
    var port = server.address().port;
    console.log("http://", host, port);
})

github：https://github.com/Rossy11/no...