一、在项目中安装mysql 和 express
cnpm install mysql express --save
二、示例代码
const express = require("express");
const app = express();
const mysql = require("mysql");
创建连接
const db = mysql.createConnection({
host:"localhost",
user:"root",
password:"root",
database:"nodemysql"
})
db.connect( (err) => {
if(err) throw err;
console.log('连接成功');
})
创建数据库
app.get("/createdb",(req,res) => {
let sql = "CREATE DATABASE nodemysql";
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.send("Datebase create success...")
}
})
})
创建表
app.get("/createpoststable",(req,res) => {
// 创建表 表名为posts id自增 title字符串长度255 body字符串255 主键是ID
let sql = "CREATE TABLE posts(id int AUTO_INCREMENT,title VARCHAR(255),body VARCHAR(255),PRIMARY KEY(ID))";
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.send("posts表创建成功....")
}
})
})
插入数据
app.get("/addpost2",(req,res) => {
let post = {title:"post two",body:"weasth"};
let sql = "INSERT INTO posts SET ?";
db.query(sql,post,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.send("post2 added....")
}
})
})
查询内容
app.get("/getposts",(req,res) => {
let sql = "SELECT * FROM posts";
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
// res.send("查询成功")
res.json(result)
}
})
})
查询单条内容
app.get("/getposts/:id",(req,res) => {
let sql = `SELECT * FROM posts WHERE id = ${req.params.id}`;
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.json(result)
}
})
})
更新内容
app.get("/updatepost/:id",(req,res) => {
let newTitle = "update title";
let sql = `UPDATE posts SET title = '${newTitle}' WHERE id = ${req.params.id}`;
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.send(`update ${req.params.id} success....`)
}
})
})
删除内容
app.get("/deletepost/:id",(req,res) => {
let sql = `DELETE FROM posts WHERE id = ${req.params.id}`;
db.query(sql,(err,result) => {
if(err){
console.log(err);
}else{
console.log(result);
res.send("删除成功.....")
}
})
})
app.listen(3000, () => {
console.log("服务器开启在3000端口....");
})
