# 13.5 實現部落格的增刪改
前面介紹了 beego 框架實現的整體構思以及部分實現的虛擬碼，這小節介紹透過 beego 建立一個部落格系統，包括部落格瀏覽、新增、修改、刪除等操作。
## 部落格目錄
部落格目錄如下所示：
.
├── 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
## 部落格路由
部落格主要的路由規則如下所示：
```Go
//顯示部落格首頁
beego.Router("/", &controllers.IndexController{})
//檢視部落格詳細資訊
beego.Router("/view/:id([0-9]+)", &controllers.ViewController{})
//建立部落格博文
beego.Router("/new", &controllers.NewController{})
//刪除博文
beego.Router("/delete/:id([0-9]+)", &controllers.DeleteController{})
//編輯博文
beego.Router("/edit/:id([0-9]+)", &controllers.EditController{})
```
## 資料庫結構
資料庫設計最簡單的部落格資訊
```sql
CREATE TABLE entries (
id INT AUTO_INCREMENT,
title TEXT,
content TEXT,
created DATETIME,
primary key (id)
);
```
## 控制器
IndexController:
```Go
type IndexController struct {
beego.Controller
}
func (this *IndexController) Get() {
this.Data["blogs"] = models.GetAll()
this.Layout = "layout.tpl"
this.TplName = "index.tpl"
}
```
ViewController:
```Go
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.TplName = "view.tpl"
}
```
NewController
```Go
type NewController struct {
beego.Controller
}
func (this *NewController) Get() {
this.Layout = "layout.tpl"
this.TplName = "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
```Go
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.TplName = "edit.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
```Go
type DeleteController struct {
beego.Controller
}
func (this *DeleteController) Get() {
id, _ := strconv.Atoi(this.Ctx.Input.Params()[":id"])
blog := models.GetBlog(id)
this.Data["Post"] = blog
models.DelBlog(blog)
this.Ctx.Redirect(302, "/")
}
```
## model 層
```Go
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
}
```
## view 層
layout.tpl
```html
My Blog
{{.LayoutContent}}
```
index.tpl
```html
Blog posts
```
view.tpl
```html
{{.Post.Title}}
{{.Post.Created}}
{{.Post.Content}}
```
new.tpl
```html
New Blog Post
```
edit.tpl
```html
Edit {{.Post.Title}}
New Blog Post
```
## links
* [目錄]()
* 上一節：[日誌和配置設計](<13.4.md>)
* 下一節：[小結](<13.6.md>)