golang（3）：beego CRUD demo （1）
本文的原文连接是: http://blog.csdn.net/freewebsys/article/details/46699343 转载请一定注明出处！
1，beego 自带crud生成工具
工具执行非常简单：
bee generate scaffold post -fields="title:string,body:text"设置模块post，里面的fileds有两个 title 和body。
bee generate scaffold post -fields="title:string,body:text"
2015/06/30 19:00:54 [INFO] Using 'post' as scaffold name
2015/06/30 19:00:54 [INFO] Do you want me to create a post model? [yes|no]] yes
2015/06/30 19:00:56 [INFO] Using 'Post' as model name
2015/06/30 19:00:56 [INFO] Using 'models' as package name
2015/06/30 19:00:56 [INFO] model file generated: /Users/freewebsys/Workspace_go/demo1/src/models/post.go
2015/06/30 19:00:56 [INFO] Do you want me to create a post controller? [yes|no]] yes
2015/06/30 19:00:58 [INFO] Using 'Post' as controller name
2015/06/30 19:00:58 [INFO] Using 'controllers' as package name
2015/06/30 19:00:58 [INFO] controller file generated: /Users/freewebsys/Workspace_go/demo1/src/controllers/post.go
2015/06/30 19:00:58 [INFO] Do you want me to create views for this post resource? [yes|no]] yes
2015/06/30 19:01:01 [INFO] Created: /Users/freewebsys/Workspace_go/demo1/src/views/post/index.tpl
2015/06/30 19:01:01 [INFO] Created: /Users/freewebsys/Workspace_go/demo1/src/views/post/show.tpl
2015/06/30 19:01:01 [INFO] Created: /Users/freewebsys/Workspace_go/demo1/src/views/post/create.tpl
2015/06/30 19:01:01 [INFO] Created: /Users/freewebsys/Workspace_go/demo1/src/views/post/edit.tpl
2015/06/30 19:01:01 [INFO] Do you want me to create a post migration and schema for this resource? [yes|no]] yes
2015/06/30 19:01:07 [INFO] Migration file generated: /Users/freewebsys/Workspace_go/demo1/src/database/migrations/20150630_190107_post.go
2015/06/30 19:01:07 [INFO] Do you want to go ahead and migrate the database? [yes|no]] no
2015/06/30 19:01:09 [INFO] All done! Don't forget to add beego.Router("/post" ,&controllers.PostController{}) to routers/route.go
2015/06/30 19:01:09 [SUCC] generate successfully created!生成了一堆代码，但是controller的代码是空方法，生成的页面代也是只有一行。
models里面的代码很全：
package models
import (
"errors"
"fmt"
"reflect"
"strings"
"github.com/astaxie/beego/orm"
)
type Post struct {
Id int64 `orm:"auto"`
Title string `orm:"size(128)"`
Body string `orm:"type(longtext)"`
}
func init() {
orm.RegisterModel(new(Post))
}
// AddPost insert a new Post into database and returns
// last inserted Id on success.
func AddPost(m *Post) (id int64, err error) {
o := orm.NewOrm()
id, err = o.Insert(m)
return
}
// GetPostById retrieves Post by Id. Returns error if
// Id doesn't exist
func GetPostById(id int) (v *Post, err error) {
o := orm.NewOrm()
v = &Post{Id: id}
if err = o.Read(v); err == nil {
return v, nil
}
return nil, err
}
// GetAllPost retrieves all Post matches certain condition. Returns empty list if
// no records exist
func GetAllPost(query map[string]string, fields []string, sortby []string, order []string,
offset int64, limit int64) (ml []interface{}, err error) {
o := orm.NewOrm()
qs := o.QueryTable(new(Post))
// query k=v
for k, v := range query {
// rewrite dot-notation to Object__Attribute
k = strings.Replace(k, ".", "__", -1)
qs = qs.Filter(k, v)
}
// order by:
var sortFields []string
if len(sortby) != 0 {
if len(sortby) == len(order) {
// 1) for each sort field, there is an associated order
for i, v := range sortby {
orderby := ""
if order[i] == "desc" {
orderby = "-" + v
} else if order[i] == "asc" {
orderby = v
} else {
return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
}
sortFields = append(sortFields, orderby)
}
qs = qs.OrderBy(sortFields...)
} else if len(sortby) != len(order) && len(order) == 1 {
// 2) there is exactly one order, all the sorted fields will be sorted by this order
for _, v := range sortby {
orderby := ""
if order[0] == "desc" {
orderby = "-" + v
} else if order[0] == "asc" {
orderby = v
} else {
return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
}
sortFields = append(sortFields, orderby)
}
} else if len(sortby) != len(order) && len(order) != 1 {
return nil, errors.New("Error: 'sortby', 'order' sizes mismatch or 'order' size is not 1")
}
} else {
if len(order) != 0 {
return nil, errors.New("Error: unused 'order' fields")
}
}
var l []Post
qs = qs.OrderBy(sortFields...)
if _, err := qs.Limit(limit, offset).All(&l, fields...); err == nil {
if len(fields) == 0 {
for _, v := range l {
ml = append(ml, v)
}
} else {
// trim unused fields
for _, v := range l {
m := make(map[string]interface{})
val := reflect.ValueOf(v)
for _, fname := range fields {
m[fname] = val.FieldByName(fname).Interface()
}
ml = append(ml, m)
}
}
return ml, nil
}
return nil, err
}
// UpdatePost updates Post by Id and returns error if
// the record to be updated doesn't exist
func UpdatePostById(m *Post) (err error) {
o := orm.NewOrm()
v := Post{Id: m.Id}
// ascertain id exists in the database
if err = o.Read(&v); err == nil {
var num int64
if num, err = o.Update(m); err == nil {
fmt.Println("Number of records updated in database:", num)
}
}
return
}
// DeletePost deletes Post by Id and returns error if
// the record to be deleted doesn't exist
func DeletePost(id int) (err error) {
o := orm.NewOrm()
v := Post{Id: id}
// ascertain id exists in the database
if err = o.Read(&v); err == nil {
var num int64
if num, err = o.Delete(&Post{Id: id}); err == nil {
fmt.Println("Number of records deleted in database:", num)
}
}
return
}
3，运行项目
要运行项目需要再src目录下面增加一个main.go
package main
import (
_ "routers"
"github.com/astaxie/beego"
)
func main() {
beego.Run()
}同时在，src/routers，下面增加router.go
package routers
import (
"controllers"
"github.com/astaxie/beego"
)
func init() {
beego.Router("/post/list",&controllers.PostController{},"get:List")
beego.Router("/post/edit",&controllers.PostController{},"get:Edit")
beego.Router("/post/save",&controllers.PostController{},"post:Save")
beego.Router("/post/delete",&controllers.PostController{},"delete:Delete")
}
由于controller没有自动生成，需要自己修改：
package controllers
import (
"github.com/astaxie/beego"
)
// operations for Post
type PostController struct {
beego.Controller
}
func (c *PostController) List() {
c.TplNames = "post/list.tpl"
}
func (c *PostController) Edit() {
c.TplNames = "post/edit.tpl"
}
func (c *PostController) Save() {
c.Ctx.WriteString("hello")
//c.TplNames = "post/index.tpl"
}
func (c *PostController) Delete() {
c.Ctx.WriteString("hello")
//c.TplNames = "post/index.tpl"
}4，总结
本文的原文连接是: http://blog.csdn.net/freewebsys/article/details/46699343 转载请一定注明出处！
对beego的代码生成工具有了一个简单的了解，其中mvc中，module代码生成的比较完善，其他的只生成一个文件而已。