本文基于已搭建好 express 项目并且已经安装MySql环境
本文查看MySql用 navicat
let express = require(‘express‘) let router = express.Router() let mysql = require(‘mysql‘) // 创建数据库链接(参数不用说了见名知意) let conn = mysql.createConnection({ host: ‘localhost‘, user: ‘root‘, password: ‘密码‘, port: ‘3306‘, database: ‘test2‘ // 链接指定数据库 }) // 在这里写接口 module.exports = router
app.js引入student.js 文件
router.get("/query", (req, res, next) => {
conn.connect(); // 创建sql链接
const sql = "select * from student"; // sql语句
conn.query(sql, (err, result) => {
if (err) {
res.json({
code: 500,
msg: "SQL执行错误",
err
})
} else {
res.json({
code: 200,
msg: "查询成功",
data: result // 查询结果
})
}
conn.destroy(); // 关闭sql链接
})
})
重启express 项目，然后前端ajax调用接口(直接用jq省事)：
$.ajax({ type: "get", url: "http://localhost:3000/student/query", success: function (res) { console.log(res); }, error: function (err) { console.log(err); }, });
// 查询-根据条件(名称) router.get("/query2", (req, res, next) => { console.log(‘前端get请求参数：‘, req.query); conn.connect(); const sql = "select * from student where name=?"; // 执行查询语句 const sqlParams = [req.query.name] // 条件 conn.query(sql, sqlParams, (err, result) => { if (err) { res.json({ code: 500, msg: "SQL执行错误", err }) } else { res.json({ code: 200, msg: "查询成功", data: result }) } conn.destroy(); }) })
重启express 项目，然后前端ajax调用接口：
$.ajax({ type: "get", url: "http://localhost:3000/student/query2", data: { name: "Anne" }, success: function (res) { console.log(res); }, error: function (err) { console.log(err); }, });
router.post("/add", (req, res, next) => {
console.log(‘前端post请求参数：‘, req.body);
conn.connect();
const sql = "insert into student(name,age,sex) values(?,?,?)" //SQL语句
const sqlParams = [req.body.name, req.body.age, req.body.sex] // 动态参数
conn.query(sql, sqlParams, (err, result) => {
if (err) {
res.json({
code: 500,
msg: "SQL执行错误",
err
})
} else {
res.json({
code: 200,
msg: "增加成功",
data: result
})
}
conn.destroy();
})
})
$.ajax({ type: "post", url: "http://localhost:3000/student/add", data: { name: "Lili", age: "15", sex: "0" }, success: function (res) { console.log(res); }, error: function (err) { console.log(err); }, });
到navicat查看数据库的student表多了刚才增加的数据
router.put("/edit/:id", (req, res, next) => {
const id = req.params.id;
console.log(‘前端put请求id：‘, id);
console.log(‘前端put请求参数：‘, req.body);
conn.connect();
const sql = "update student set name=?,age=?,sex=? where id=?" //SQL语句
const sqlParams = [req.body.name, req.body.age, req.body.sex, id] // 动态参数
conn.query(sql, sqlParams, (err, result) => {
if (err) {
res.json({
code: 500,
msg: "SQL执行错误",
err
})
} else {
res.json({
code: 200,
msg: "编辑成功",
data: result
})
}
conn.destroy();
})
})
重启express 项目，然后前端ajax调用接口：
$.ajax({ type: "put", url: "http://localhost:3000/student/edit/" + 4, data: { name: "Lili", age: "25", sex: "2" }, success: function (res) { console.log(res); }, error: function (err) { console.log(err); }, });
router.delete("/delete/:id", (req, res, next) => { const id = req.params.id; console.log(‘前端delete请求id：‘, id); conn.connect(); const sql = "delete from student where id=?" //SQL语句 const sqlParams = [id] // 动态参数 conn.query(sql, sqlParams, (err, result) => { if (err) { res.json({ code: 500, msg: "SQL执行错误", err }) } else { res.json({ code: 200, msg: "删除成功", data: result }) } conn.destroy(); }) })
$.ajax({ type: "delete", url: "http://localhost:3000/student/delete/" + 4, success: function (res) { console.log(res); }, error: function (err) { console.log(err); }, });
原文：https://www.cnblogs.com/konghaowei/p/14901257.html