13.5 实现博客的增删改
最后更新于：2022-04-01 15:30:18
前面介绍了beego框架实现的整体构思以及部分实现的伪代码，这小节介绍通过beego建立一个博客系统，包括博客浏览、添加、修改、删除等操作。
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#博客目录)博客目录
博客目录如下所示：
~~~
.
├── controllers
│ ├── delete.go
│ ├── edit.go
│ ├── index.go
│ ├── new.go
│ └── view.go
├── main.go
├── models
│ └── model.go
└── views
├── edit.tpl
├── index.tpl
├── layout.tpl
├── new.tpl
└── view.tpl
~~~
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#博客路由)博客路由
博客主要的路由规则如下所示：
~~~
//显示博客首页
beego.Router("/", &controllers.IndexController{})
//查看博客详细信息
beego.Router("/view/:id([0-9]+)", &controllers.ViewController{})
//新建博客博文
beego.Router("/new", &controllers.NewController{})
//删除博文
beego.Router("/delete/:id([0-9]+)", &controllers.DeleteController{})
//编辑博文
beego.Router("/edit/:id([0-9]+)", &controllers.EditController{})
~~~
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#数据库结构)数据库结构
数据库设计最简单的博客信息
~~~
CREATE TABLE entries (
id INT AUTO_INCREMENT,
title TEXT,
content TEXT,
created DATETIME,
primary key (id)
);
~~~
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#控制器)控制器
IndexController:
~~~
type IndexController struct {
beego.Controller
}
func (this *IndexController) Get() {
this.Data["blogs"] = models.GetAll()
this.Layout = "layout.tpl"
this.TplNames = "index.tpl"
}
~~~
ViewController:
~~~
type ViewController struct {
beego.Controller
}
func (this *ViewController) Get() {
id, _ := strconv.Atoi(this.Ctx.Input.Params(":id"))
this.Data["Post"] = models.GetBlog(id)
this.Layout = "layout.tpl"
this.TplNames = "view.tpl"
}
~~~
NewController
~~~
type NewController struct {
beego.Controller
}
func (this *NewController) Get() {
this.Layout = "layout.tpl"
this.TplNames = "new.tpl"
}
func (this *NewController) Post() {
inputs := this.Input()
var blog models.Blog
blog.Title = inputs.Get("title")
blog.Content = inputs.Get("content")
blog.Created = time.Now()
models.SaveBlog(blog)
this.Ctx.Redirect(302, "/")
}
~~~
EditController
~~~
type EditController struct {
beego.Controller
}
func (this *EditController) Get() {
id, _ := strconv.Atoi(this.Ctx.Input.Params[":id"])
this.Data["Post"] = models.GetBlog(id)
this.Layout = "layout.tpl"
this.TplNames = "new.tpl"
}
func (this *EditController) Post() {
inputs := this.Input()
var blog models.Blog
blog.Id, _ = strconv.Atoi(inputs.Get("id"))
blog.Title = inputs.Get("title")
blog.Content = inputs.Get("content")
blog.Created = time.Now()
models.SaveBlog(blog)
this.Ctx.Redirect(302, "/")
}
~~~
DeleteController
~~~
type DeleteController struct {
beego.Controller
}
func (this *DeleteController) Get() {
id, _ := strconv.Atoi(this.Ctx.Input.Params(":id"))
blog := GetBlog(id int)
this.Data["Post"] = blog
models.DelBlog(blog)
this.Ctx.Redirect(302, "/")
}
~~~
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#model层)model层
~~~
package models
import (
"database/sql"
"github.com/astaxie/beedb"
_ "github.com/ziutek/mymysql/godrv"
"time"
)
type Blog struct {
Id int `PK`
Title string
Content string
Created time.Time
}
func GetLink() beedb.Model {
db, err := sql.Open("mymysql", "blog/astaxie/123456")
if err != nil {
panic(err)
}
orm := beedb.New(db)
return orm
}
func GetAll() (blogs []Blog) {
db := GetLink()
db.FindAll(&blogs)
return
}
func GetBlog(id int) (blog Blog) {
db := GetLink()
db.Where("id=?", id).Find(&blog)
return
}
func SaveBlog(blog Blog) (bg Blog) {
db := GetLink()
db.Save(&blog)
return bg
}
func DelBlog(blog Blog) {
db := GetLink()
db.Delete(&blog)
return
}
~~~
## [](https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/13.5.md#view层)view层
layout.tpl
~~~
<html>
<head>
<title>My Blog</title>
<style>
#menu {
width: 200px;
float: right;
}
</style>
</head>
<body>
<ul id="menu">
<li><a href="/">Home</a></li>
<li><a href="/new">New Post</a></li>
</ul>
{{.LayoutContent}}
</body>
</html>
~~~
index.tpl
~~~
<h1>Blog posts</h1>
<ul>
{{range .blogs}}
<li>
<a href="/view/{{.Id}}">{{.Title}}</a>
from {{.Created}}
<a href="/edit/{{.Id}}">Edit</a>
<a href="/delete/{{.Id}}">Delete</a>
</li>
{{end}}
</ul>
~~~
view.tpl
~~~
<h1>{{.Post.Title}}</h1>
{{.Post.Created}}<br/>
{{.Post.Content}}
~~~
new.tpl
~~~
<h1>New Blog Post</h1>
<form action="" method="post">
标题:<input type="text" name="title"><br>
内容：<textarea name="content" colspan="3" rowspan="10"></textarea>
<input type="submit">
</form>
~~~
edit.tpl
~~~
<h1>Edit {{.Post.Title}}</h1>
<h1>New Blog Post</h1>
<form action="" method="post">
标题:<input type="text" name="title" value="{{.Post.Title}}"><br>
内容：<textarea name="content" colspan="3" rowspan="10">{{.Post.Content}}</textarea>
<input type="hidden" name="id" value="{{.Post.Id}}">
<input type="submit">
</form>
~~~