koa+mongoose实现简单增删改查接口的示例代码

配合上一篇文章的联系人应用()，实现配套的基于nodejs的后台增删改查接口

1. 所需工具

• node.js
• mongodb

2. 主要node模块

koa(，一个nodejs的开发框架)，mongoose(，mongdb操作工具)

3. 目录结构

4. 启动mongodb

首先在mongodb安装盘的根目录下(这里假设是d盘)新建一个文件夹data，然后在mongodb的bin中打开终端，输入mongod --dbpath d:\data，这样mongodb的数据存放地点就配置好了。

然后双击bin中的mongo.exe，mongodb就启动完成了。

5. app.js

app.js为入口文件，功能是连接数据库，导入文件，引入koa组件，最后启动服务。

'use strict';

const fs = require('fs');
const path = require('path');
const mongoose = require('mongoose');

const db = 'mongodb://localhost/test';

/* 连接数据库 */
mongoose.promise = require('bluebird');
mongoose.connect(db, {usemongoclient: true});

/**
 * 获取数据库表对应的js对象所在的路径
 * @type {[type]}
 */
const models_path = path.join(__dirname, '/app/models');

/**
 * 已递归的形式，读取models文件夹下的js模型文件，并require
 * @param {[type]} modelpath [description]
 * @return {[type]}   [description]
 */
let walk = function (modelpath) {
 fs.readdirsync(modelpath).foreach(function (file) {
  let filepath = path.join(modelpath, '/' + file)
  let stat = fs.statsync(filepath)

  if (stat.isfile()) {
   if (/(.*)\.(js|coffee)/.test(file)) {
    require(filepath)
   }
  }
  else if (stat.isdirectory()) {
   walk(filepath)
  }
 })
};
walk(models_path);

require('babel-register');
const koa = require('koa');
const logger = require('koa-logger');
const session = require('koa-session');
const bodyparser = require('koa-bodyparser');
const app = new koa();

app.use(logger());
app.use(session(app));
app.use(bodyparser());


/**
 * 使用路由转发请求
 * @type {[type]}
 */
const router = require('./config/router')();

app.use(router.routes());
app.use(router.allowedmethods());

app.listen(3000);
console.log('app started at port 3000...');

6. 路由配置

路由配置在config/router.js中进行。

const router = require('koa-router');
const user = require('../app/controllers/user');

module.exports = function () {
 let router = new router({
  prefix: '/api'
 });

 router.post('/test/user/users', user.users);
 router.post('/test/user/user', user.user);
 router.post('/test/user/add', user.adduser);
 router.post('/test/user/delete', user.deleteuser);
 return router
};

post方法第一参数为路由地址，第二参数为路由地址对应的方法。 

7. 表结构定义

表结构定义在app/models/user.js中。

let mongoose = require('mongoose');
let schema = mongoose.schema;

// 定义表结构
let userschema = new schema({
 name: {
  type: string,
  required: true
 },
 sex: string,
 area: string,
 always: boolean,
 relationship: array,
 mobile: string,
 phone: string,
 desc: string,
 id: string
});

// 参数user 数据库中的集合名称, 不存在会创建.
let user = mongoose.model('user', userschema);

module.exports = user;

8. 工具方法

一些增删改查的工具方法放在app/dbhelp/userhelp.js中

'use strict';

let mongoose = require('mongoose');
let user = mongoose.model('user');

/* 查找用户 */
exports.findallusers = async () => {
 let query = user.find();
 let res = [];
 await query.exec(function (err, users) {
  if (err) {
   res = [];
  } else {
   res = users;
  }
 });
 return res
};

/* 查找特定用户 */
exports.findfilterusers = async (params) => {
 let namereg = new regexp(params.name, 'i');
 let query = user.find({
  name: {
   $regex: namereg
  }
 });
 let res = [];
 await query.exec(function (err, users) {
  if (err) {
   res = []
  } else {
   res = users;
  }
 });
 return res
};

/* 查找单个用户 */
exports.finduser = async (params) => {
 let query = user.find({
  id: params.id
 });
 let res = {};
 await query.exec(function (err, tuser) {
  if (err) {
   res = '没有该用户';
  } else {
   res = tuser[0];
  }
 });
 return res
};

/* 新增用户 */
exports.adduser = async (user) => {
 user = await user.save();
 return user
};

/* 编辑用户 */
exports.updateuser = async (user) => {
 user = await user.update({id: user.id}, {
  $set: {
   name: user.name,
   sex: user.sex,
   area: user.area,
   always: user.always,
   relationship: user.relationship,
   phone: user.phone,
   mobile: user.mobile,
   desc: user.desc
  }
 });
 return user
};

/* 删除用户 */
exports.deleteuser = async ({id}) => {
 let flag = false;
 console.log('flag==========>' + flag);
 await user.remove({id}, function (err) {
  if (err) {
   flag = false
  } else {
   flag = true
  }

 });
 console.log('flag=====await=====>' + flag);
 return flag
};

9. 路由配置中对应的方法

路由配置中对应的方法在app/controller/user.js中。

'use strict';

let xss = require('xss');
let mongoose = require('mongoose');
let user = mongoose.model('user');
let uuid = require('uuid');
import userhelper from '../dbhelper/userhelper.js'

/* 多用户 */
exports.users = async (ctx, next) => {
 let data;
 if (ctx.request.body) {
  data = await userhelper.findfilterusers(ctx.request.body)
 } else {
  data = await userhelper.findallusers()
 }

 ctx.body = {
  success: true,
  data
 }
};
/* 单用户 */
exports.user = async (ctx, next) => {
 let data = await userhelper.finduser(ctx.request.body)

 ctx.body = {
  success: true,
  data
 }
};
/* 添加(更新)用户 */
exports.adduser = async (ctx, next) => {
 let newobj = ctx.request.body,
  user2;
 let id = newobj.id || uuid.v4();
 let user = new user({
  name: newobj.name,
  sex: newobj.sex,
  area: newobj.area,
  always: newobj.always,
  relationship: newobj.relationship,
  phone: newobj.phone,
  mobile: newobj.mobile,
  desc: newobj.desc,
  id: id
 });
 if (newobj.id) {
  user2 = await userhelper.updateuser(user);
 } else {
  user2 = await userhelper.adduser(user);
 }

 if (user2) {
  ctx.body = {
   success: true,
   data: user2
  }
 }
};
/* 删除用户 */
exports.deleteuser = async (ctx, next) => {
 let id = xss(ctx.request.body.id);
 let data = await userhelper.deleteuser({id});
 ctx.body = {
  success: true,
  data
 }
};

总结：

其实没有什么花头，无非都是api的使用，这里比较多用async与await实现异步操作，阮老师的文章里有async的一切，。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。