npm install express --save
二、express配置
//引入
const express = require("express");
//创建实例
const app = express();
//启动服务
app.listen(8081, () => {
console.log("http://localhost:8081");
});
三、安装mysql
npm i mysql
四、配置到express中
const express = require("express");
const mysql = require("mysql"); //引入mysql
const app = express();
// 设置MySQL连接配置
const connection = mysql.createConnection({
host: "localhost",
user: "root", //数据库账号
password: "root", //数据库密码
database: "deli", //数据库名称
});
// 连接到MySQL数据库
connection.connect((error) => {
if (error) throw error;
//连接成功打印结果`如果连接失败，记得查看数据库是否开启`
console.log("Successfully connected to the database.");
});
app.listen(8081, () => {
console.log("http://localhost:8081");
});
五、加入get请求
const express = require("express");
const mysql = require("mysql");
const app = express();
// 设置MySQL连接配置
const connection = mysql.createConnection({
host: "localhost",
user: "root",
password: "root",
database: "deli",
});
// 连接到MySQL数据库
connection.connect((error) => {
if (error) throw error;
console.log("Successfully connected to the database.");
});
`这里为增加的get请求内容`
app.get("/testApi", (req, res) => {
//获取到请求参数
const { config_name } = req.query;
//去表名称为config的表中去查数据 ，查询条件为`config_name="${config_name}"`，其中双引号不可省去
connection.query(
`SELECT * FROM config where config_name="${config_name}"`,
(error, results, fields) => {
if (error) throw error;
// 发送响应
res.send(results);
}
);
});
app.listen(8081, () => {
console.log("http://localhost:8081");
});
六、前端请求接口
