node.j mysql rest_Node.js之mysql增删改查
1.安装库
npm install mysql
2.编写db.js(用作公共模块)
//连接MySQL数据库
var mysql = require("mysql");
var pool = mysql.createPool({
host:"127.0.0.1",
user:"root",
password:"123456",
database:"wordpress",
port:3306
});
function query(sql,callback){
pool.getConnection(function(err,connection){
connection.query(sql, function (err,rows) {
callback(err,rows);
connection.release();
});
});
}
exports.query = query;
3.编写user.js(与数据库交互并对外开放接口)
顺便说下req.params、req.body、req.query的应用
req.body通常用于解析post请求数据
var express = require('express');
var router = express.Router();
var URL = require('url');
var db = require('./db');
var jsonData = require('./jsonData');
var bodyParser = require('body-parser');
//定义一个post输出接口
router.post('/post', function(req, res) {
var obj = {
a: 1,
b: 2
};
res.json(obj); //以json格式输出
});
//增删改查
//查询所有信息
router.get('/queryAll', function(req, res, next) {
var userLogin = req.userLogin
var querySql = 'SELECT * FROM wp_users';
db.query(querySql,function (err, rows) {
if(err){
console.log('[SELECT ERROR] - ',err.message);
return;
}
//把搜索值输出
res.send(rows);
console.log('The solution is: ', rows[0].ID);
});
});
//添加用户信息
router.post("/add",function(req,res){
var params = URL.parse(req.url, true).query;
var addSql = "INSERT INTO wp_users (user_login) VALUES('"+params.userLogin+"')";
var addSqlParams = [params.userLogin];
db.query(addSql,function(err,rows){
if(err){
res.send("添加失败 " + err);
}else {
res.send(jsonData.addInfo);
}
});
});
//更新用户信息
router.put("/update",function(req,res,next){
var params = URL.parse(req.url, true).query;
var displayName = params.displayName;
var id = params.id;
var sql = "update wp_users set display_name = '"+ displayName +"' where ID = " + id;
db.query(sql,function(err,rows){
if(err){
res.send("修改失败 " + err);
}else {
res.send(jsonData.updateInfo);
}
});
});
//根据ID获取用户信息
router.get("/getById/:id",function(req,res){
var id = req.params.id;
var sql = 'select * from wp_users where ID = '+id;
db.query(sql,function (err, result) {
if(err){
console.log('[SELECT ERROR] - ',err.message);
return;
}
console.log(result);
res.send(result);
});
});
//删除用户信息
router.delete('/delete/:id', function(req, res, next) {
var id = req.params.id;
var delSql = 'delete from wp_users where id = '+id;
db.query(delSql,function (err, result) {
if(err){
console.log('[INSERT ERROR] - ',err.message);
return;
}
res.send(jsonData.deleteInfo);
});
});
module.exports = router;
4.不要忘记在app.js配置路由
var usersRouter = require('./routes/users');
app.use('/users', usersRouter);
参考资料如下:
node.js取参四种方法req.body,req.params,req.param,req.body:https://www.cnblogs.com/jkingdom/p/8065202.html