完成前台文章操作接口
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README.md
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README.md
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## 九、项目 - 个人网站管理
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### 9.1 介绍
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### 9.2 功能模块
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#### 整体采用前后端分离
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后端： nodejs + expressjs + mysql 完成数据存取，如何验证是否已经登录(session、cookie)
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前端：vue + element-ui
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#### 模块
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**用户模块**：管理用户的登录、退出、信息修改等
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**文章模块**：添加文章、修改文章、查询文章、删除文章、文件的上传等 -
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**前台模块** : 查询文章列表(分页|搜索)、查询文章的详情、更新文章的数据、文章的搜索、
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**评论模块**：添加评论、查询评论、删除评论(管理员)
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### 9.3 快速开始 - 搭建项目框架
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1、使用npm初始化项目
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```shell
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mkdir pro-blog
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cd pro-blog
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# 使用npm初始化项目
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npm init -y
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```
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2、安装项目所需的依赖
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```shell
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npm i express mysql vue element-ui
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npm i -D nodemon
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```
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3、package.json - 项目的信息
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提交项目时不要提交node_modules,只需要有package.json文件，执行`npm i`
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```json
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{
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"name": "pro-blog",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"scripts": {
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"start": "nodemon index.js"
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},
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"keywords": [],
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"author": "",
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"license": "ISC",
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"dependencies": {
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"element-ui": "^2.15.8",
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"express": "^4.18.1",
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"mysql": "^2.18.1",
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"vue": "^3.2.33"
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},
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"devDependencies": {
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"nodemon": "^2.0.16"
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}
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}
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```
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4、入口文件 - index.js
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```javascript
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const express = require("express")
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const user = require('./modules/user') // 用户模块
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const article = require('./modules/article') // 文章
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const app = express(); // 创建express应用
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app.use(express.static('public')) // 设置静态文件路径
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// 使用路由模块
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app.use('/api/user',user)
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app.use('/api/article',article)
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app.listen(3000); // 监听端口
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console.log('server run success! http://localhost:3000')
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```
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5、user 与 article 模块
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```javascript
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// article.js
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const router = require('express').Router(); // 创建一个路由对象
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// 实现相应路由功能
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// ....
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module.exports = router // 暴露路由对象
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// user.js
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const router = require('express').Router();
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module.exports = router
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```
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### 9.4 数据库结构
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用户登录表: 登录信息ID、登录时间、登录IP、客户端标识、有效期
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文章表: 文章ID、标题、封面、发布时间、描述(一部分的文章内容)、文章内容、分类、阅读量、评论数、状态
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评论表: 评论ID、文章ID、评论内容、发布时间、评论者IP
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```sql
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create DATABASE pro_blog;
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use pro_blog;
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-- 用户登录表: 登录信息ID、登录时间、登录IP、客户端标识、有效期
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create table login(
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id int(10) PRIMARY KEY AUTO_INCREMENT,
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login_time datetime not null,
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BIGINT -- xxx.xxx.xxx.xx -> ipv4
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-- xxxx:xxxx:xxxx::xxxx -> ipv6
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ip varchar(40) not null,
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client varchar(200) null,
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expire_time datetime null
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);
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-- 文章表: 文章ID、标题、封面、发布时间、描述(一部分的文章内容)、文章内容、分类、阅读量、评论数、状态
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create table article(
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id int(10) PRIMARY KEY AUTO_INCREMENT,
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title varchar(50) not null,
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cover varchar(200) null,
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publish_time datetime null,
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description varchar(500) null,
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content text not null,
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category varchar(20) not null,
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view_count int default 0,
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comment_count int default 0,
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status tinyint(1) default 1 -- 状态 1标识草稿 2表示已发布 0表示已删除
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);
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-- 评论表: 评论ID、文章ID、评论内容、发布时间、评论者IP
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create table comment
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(
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id int(10) PRIMARY KEY AUTO_INCREMENT,
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article_id int(10) not null,
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content varchar(500) not null,
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publish_time datetime not null,
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ip varchar(40) not null
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);
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```
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### 9.6 功能实现
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#### 9.6.1 文章模块
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##### 1、公共数据库查询工具模块
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```javascript
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// 数据查询工具封装
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const mysql = require('mysql')
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// 创建数据库连接池
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const pool = mysql.createPool({
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user: 'root',
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password: '123',
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database: 'pro_blog',
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timezone: 'Asia/Shanghai'
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});
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// 执行查询操作 返回Promise对象
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function query(sql, values = []) {
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return new Promise(function (resolve, reject) { // resolve是成功的回调函数 reject是错误的回调函数
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pool.query(sql, values, function (err, result) {
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if (err) {
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reject(err) // 有错误 直接回调错误的函数
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} else {
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resolve(result) // 直接正常的回调
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}
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});
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});
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}
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// 暴露接口
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module.exports = {
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pool,
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createConnection: pool.getConnection,
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query
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}
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```
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##### 2、实现分页查询文章列表
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article.js
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```javascript
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const db = require('./db'); //
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// 文章模块
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const router = require('express').Router();
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// 1.查询文章列表(分页)
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router.get("/web/list",async function (req, res) {
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const page = req.query['page'] || 1; // 获取页码
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// 默认每页5条
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const start = (page - 1) * 5;
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try{
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const listResult = await db.query("select * from article limit ?,5", [start]); // 执行查询语句并等待结果出来后赋值给变量
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const totalCount = await db.query('select count(*) as total from article'); // 执行获取总条数
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res.send({count:totalCount[0]['total'],list:listResult,size:5});
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}catch(e){
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console.log(err)
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res.send({count:0,list:[]});
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}
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});
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module.exports = router
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```
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##### 3、实现关键字查询
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article.js
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```javascript
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router.get("/web/list", async function (req, res) {
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const page = parseInt(req.query['page'] || 1); // 获取页码
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const size = parseInt(req.query['size'] || 5); // 每天条数
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// 默认每页5条
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const start = (page - 1) * size;
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const search = '%' + (req.query['search'] || '') + '%'; // 搜索关键字
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try {
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const listResult = await db.query(
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`select id,title,category,publish_time,cover,description,view_count,comment_count
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from article where title like ? or content like ? limit ?,?`,
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[search, search, start, size]); // 执行查询语句并等待结果出来后赋值给变量
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const totalCount = await db.query(
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`select count(*) as total from article where title like ? or content like ?`, [search, search]); // 执行获取总条数
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res.send({ total: totalCount[0]['total'], list: listResult, size: size });
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} catch (e) {
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console.log(e)
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res.send({ count: 0, list: [] });
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}
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});
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```
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##### 4、实现查询文章详情
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article.js
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```javascript
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// 2.查询单个文章详情
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router.all('/web/detail',async (req,res)=>{
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let id = req.query['id'];
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if(!id || id <1){
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res.send([])
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}else{
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const article = await db.query('select * from article where id =?',[id]);
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res.send(article)
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}
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});
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```
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##### 5、实现更新文章阅读数
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article.js
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```javascript
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router.all('/web/update',async (req,res)=>{
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let id = req.query['id'];
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if(!id || id <1){
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res.send("参数不对")
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}else{
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const article = await db.query('update article set view_count=view_count + 1 where id =?',[id]);
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res.send("true")
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}
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});
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```
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42
callback-promise-test.js
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// 实现暂停功能
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function sleep(time){
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let start = Date.now();
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let i = 0;
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while(true){
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let currentTime = Date.now();
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if(currentTime - start >= time){
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break;
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}
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}
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}
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// console.log(Date.now());
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// sleep(2000);
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// console.log(Date.now());
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function sleep1(time,callback){
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setTimeout(callback,time)
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}
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// console.log(Date.now());
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// sleep1(2000,function(){
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// console.log(Date.now());
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// })
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function sleep2(time){
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return new Promise((resovle)=>{
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setTimeout(resovle,time);
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});
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}
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// console.log(Date.now());
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sleep2(2000).then(()=>{
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sleep2(2000).then(()=>{
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console.log(Date.now());
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})
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})
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async function test(){
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console.log(Date.now());
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await sleep2(2000);
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await sleep2(2000);
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console.log(Date.now());
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}
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test();
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3
db.sql
3
db.sql
@ -52,3 +52,6 @@ select * from article limit 2,2; -- 第2页
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select * from article limit 4,2; -- 第3页
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-- 假设条数位:size 页码为: page
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-- 那么分页的起始位置为: (page - 1) * size
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-- 搜索文章
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select id,title,category,publish_time,cover,description,view_count,comment_count
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from article where title like '%测试%' or content like '%测试%';
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const router = require('express').Router();
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// 用户网站模块
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// 1.查询文章列表(分页)
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router.get("/web/list",async function (req, res) {
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const page = req.query['page'] || 1; // 获取页码
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// 1.查询文章列表(分页|搜索)
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router.get("/web/list", async function (req, res) {
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const page = parseInt(req.query['page'] || 1); // 获取页码
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const size = parseInt(req.query['size'] || 5); // 每天条数
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// 默认每页5条
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const start = (page - 1) * 5;
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// db.pool.query("select * from article limit ?,5", [start], (err, listResult) => {
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// if (err) {
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// console.log(err)
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// res.send([]);
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// }
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// else{
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// // res.send(result);
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// db.pool.query('select count(*) as total from article',(err,result)=>{
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// res.send({
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// count:result,
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// list:listResult
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// });
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// })
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// }
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// });
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try{
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const listResult = await db.query("select * from article limit ?,5", [start]); // 执行查询语句并等待结果出来后赋值给变量
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const totalCount = await db.query('select count(*) as total from article'); // 执行获取总条数
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res.send({count:totalCount[0]['total'],list:listResult,size:5});
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}catch(e){
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console.log(err)
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res.send({count:0,list:[]});
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const start = (page - 1) * size;
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const search = '%' + (req.query['search'] || '') + '%'; // 搜索关键字
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try {
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const listResult = await db.query(
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`select id,title,category,publish_time,cover,description,view_count,comment_count
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from article where title like ? or content like ? limit ?,?`,
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[search, search, start, size]); // 执行查询语句并等待结果出来后赋值给变量
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const totalCount = await db.query(
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`select count(*) as total from article where title like ? or content like ?`, [search, search]); // 执行获取总条数
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res.send({ total: totalCount[0]['total'], list: listResult, size: size });
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} catch (e) {
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console.log(e)
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res.send({ count: 0, list: [] });
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}
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});
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// 2.查询单个文章详情
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router.all('/web/detail',async (req,res)=>{
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let id = req.query['id'];
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if(!id || id <1){
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res.send([])
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}else{
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const article = await db.query('select * from article where id =?',[id]);
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res.send(article)
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}
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});
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// 3.更新阅读数量
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router.all('/web/update',async (req,res)=>{
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let id = req.query['id'];
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if(!id || id <1){
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res.send("参数不对")
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}else{
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const article = await db.query('update article set view_count=view_count + 1 where id =?',[id]);
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res.send("true")
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}
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});
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// 管理后台模块
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module.exports = router
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