goweb之书城基本CRUD增删改查
作者:互联网
无法加载静态资源
在主函数中添加一条语句:
// 设置处理静态资源
http.Handle("/static/",http.StripPrefix("/static/",http.FileServer(http.Dir("views/static"))))
http.HandleFunc("/index",IndexHandler)
http.ListenAndServe(":8080",nil)
以static打头的以内静态资源得到访问,但是pages下的login/cart等还需再次配置.
// 设置处理静态资源
http.Handle("/static/",http.StripPrefix("/static/",http.FileServer(http.Dir("views/static"))))
// 直接通过a标签点击去往页面
http.Handle("/pages/",http.StripPrefix("/pages/",http.FileServer(http.Dir("views/pages"))))
查
- 连接数据库
package utils0610
import (
"database/sql"
_"github.com/mysql-master" // 勿忘引入
)
var(
Db *sql.DB
err error
)
func init(){
Db,err = sql.Open("mysql","root:123456@tcp(192.168.58.129:3306)/bookstore")
if err!=nil{
panic(err.Error())
}
}
- bookdao中操作数据库添加查询方法,由于返回图书列表,故定义结构体指针切片,返回切片类型
/*
查:查询所有图书列表
*/
func GetBooks() ([]*model0610.Book, error) {
sqlStr := "select id,title,author,price,sales,stock,img_path from books"
rows, err := utils0610.Db.Query(sqlStr)
if err != nil {
return nil, err
}
var books []*model0610.Book // 结构体指针切片
for rows.Next() {
book := &model0610.Book{} // 定义一个结构体
rows.Scan(&book.Id, &book.Title, &book.Author, &book.Price, &book.Sales, &book.Stock, &book.ImgPath)
// 将book添加到切片中
books = append(books, book)
}
return books, nil
}
- 在controller控制层中,进行模板解析文件,并执行Execute方法。进行视图的跳转
/*
获取所有图书控制器
*/
func GetBooks(w http.ResponseWriter,r *http.Request){
books, _ := dao0610.GetBooks()
t := template.Must(template.ParseFiles("views/pages/manager/book_manager.html"))
t.Execute(w,books)
}
- 定义请求url映射,即浏览器发送给服务端的url请求映射目的地。
// 获取所有图书
http.HandleFunc("/getBooks",controller0610.GetBooks)
- 前端列表展示代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理</title>
<link type="text/css" rel="stylesheet" href="/static/css/style.css" >
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="/static/img/logo.gif" >
<span class="wel_word">图书管理系统</span>
<div>
<a href="/pages/manager/book_manager.html">图书管理</a>
<a href="/">返回商城</a>
</div>
</div>
<div id="main">
<table>
<tr>
<td>名称</td>
<td>价格</td>
<td>作者</td>
<td>销量</td>
<td>库存</td>
<td colspan="2">操作</td>
</tr>
{{range .}}
<tr>
<td>{{.Title}}</td>
<td>{{.Price}}</td>
<td>{{.Author}}</td>
<td>{{.Sales}}</td>
<td>{{.Stock}}</td>
<td><a href="/getBookById?bookId={{.Id}}">修改</a></td>
<td><a href="/deleteBook?bookId={{.Id}}">删除</a></td>
</tr>
{{end}}
<td><a href="/pages/manager/book_edit.html">添加图书</a></td>
</table>
</div>
<div id="bottom">
<span>
尚硅谷书城.Copyright ©2015
</span>
</div>
</body>
</html>
增
bookdao
/*
增:新增图书
*/
func AddBook(b *model0610.Book) error {
//写sql语句
slqStr := "insert into books(title,author,price,sales,stock,img_path) values(?,?,?,?,?,?)"
//执行
_, err := utils0610.Db.Exec(slqStr, b.Title, b.Author, b.Price, b.Sales, b.Stock, b.ImgPath)
if err != nil {
return err
}
return nil
}
bookController
/*
新增图书,获取浏览器表单信息
*/
func AddBook(w http.ResponseWriter,r *http.Request){
title := r.PostFormValue("title")
author := r.PostFormValue("author")
price := r.PostFormValue("price") // 得到的是string类型,但原本是float64
priceFloat64, _ := strconv.ParseFloat(price, 64)
sales := r.PostFormValue("sales")
salesInt, _ := strconv.ParseInt(sales, 10, 0)
stock := r.PostFormValue("stock")
stockInt, _ := strconv.ParseInt(stock, 10, 0)
book := &model0610.Book{
Title: title,
Author: author,
Price: priceFloat64,
Sales: int(salesInt),
Stock: int(stockInt),
ImgPath: "/static/img/default.jpg",
}
dao0610.AddBook(book)
// 跳转到显示列表,再次查询才跳转
GetBooks(w,r)
}
main.go
// 新增图书
http.HandleFunc("/addBook",controller0610.AddBook)
删
bookdao
/*
删:删除图书
*/
func DeleteBook(id int) error {
sqlStr := "delete from books where id = ?"
_, err := utils0610.Db.Exec(sqlStr, id)
if err != nil {
return err
}
return nil
}
bookController
/*
删除图书
*/
func DeleteBookById(w http.ResponseWriter,r *http.Request){
idString := r.FormValue("bookId")
idInt, _ := strconv.ParseInt(idString, 10, 0)
dao0610.DeleteBook(int(idInt))
// 删除完之后再次查询显示列表
GetBooks(w,r)
}
改
bookdao
/*
查:改前先回显
*/
func GetBookById(id string) (*model0610.Book, error) {
sqlStr := "select id,title,author,price,sales,stock,img_path from books where id = ?"
row := utils0610.Db.QueryRow(sqlStr, id)
book := &model0610.Book{}
err := row.Scan(&book.Id, &book.Title, &book.Author, &book.Price, &book.Sales, &book.Stock, &book.ImgPath)
if err != nil {
return nil, err
}
return book, nil
}
/*
改
*/
func UpdateBook(b *model0610.Book) error {
//写sql语句
sqlStr := "update books set title=?,author=?,price=?,sales=?,stock=? where id=?"
//执行
_, err := utils0610.Db.Exec(sqlStr, b.Title, b.Author, b.Price, b.Sales, b.Stock, b.Id)
if err != nil {
return err
}
return nil
}
bookController
/*
先查回显到表单,再改
*/
func GetBookById(w http.ResponseWriter,r *http.Request){
idString := r.FormValue("bookId")
book, _ := dao0610.GetBookById(idString)
t := template.Must(template.ParseFiles("views/pages/manager/book_modify.html"))
t.Execute(w,book)
}
/*
改图书
*/
func UpdateBookById(w http.ResponseWriter,r *http.Request){
idString := r.PostFormValue("bookId")
idInt, _ := strconv.ParseInt(idString, 10, 0)
title := r.PostFormValue("title")
author := r.PostFormValue("author")
priceString := r.PostFormValue("price")
priceFloat64, _ := strconv.ParseFloat(priceString, 64)
salesString := r.PostFormValue("sales")
salesInt, _ := strconv.ParseInt(salesString, 10, 0)
stockString := r.PostFormValue("stock")
stockInt, _ := strconv.ParseInt(stockString, 10, 0)
imgPath := r.PostFormValue("imgPath")
book := &model0610.Book{
Id: int(idInt),
Title: title,
Author: author,
Price: priceFloat64,
Sales: int(salesInt),
Stock: int(stockInt),
ImgPath: imgPath,
}
dao0610.UpdateBook(book)
GetBooks(w,r)
}
book_modify.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改图书</title>
<link type="text/css" rel="stylesheet" href="/static/css/style.css" >
<style type="text/css">
h1 {
text-align: center;
margin-top: 200px;
}
h1 a {
color:red;
}
input {
text-align: center;
}
</style>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="/static/img/logo.gif" >
<span class="wel_word">修改图书</span>
<div>
<a href="/pages/manager/book_manager.html">图书管理</a>
<a href="/">返回商城</a>
</div>
</div>
<div id="main">
<form action="/updateBookById" method="POST">
<!-- 这里必须设置隐藏域,否则将不知道更新谁,图书可能会重名的情况-->
<input type="hidden" value="{{.Id}}" name="bookId"/>
<table>
<tr>
<td>名称</td>
<td>价格</td>
<td>作者</td>
<td>销量</td>
<td>库存</td>
<td colspan="2">操作</td>
</tr>
<tr>
<td><input name="title" type="text" value="{{.Title}}"/></td>
<td><input name="price" type="text" value="{{.Price}}"/></td>
<td><input name="author" type="text" value="{{.Author}}"/></td>
<td><input name="sales" type="text" value="{{.Sales}}"/></td>
<td><input name="stock" type="text" value="{{.Stock}}"/></td>
<td><input type="submit" value="提交"/></td>
</tr>
</table>
</form>
</div>
<div id="bottom">
<span>
尚硅谷书城.Copyright ©2015
</span>
</div>
</body>
</html>
main.go
package main
import (
"go_codes/day0610_cabbeen/controller0610"
"html/template"
"net/http"
)
/*
跳转首页,使用模板引擎
*/
func IndexHandler(w http.ResponseWriter,r *http.Request){
t:=template.Must(template.ParseFiles("views/index.html"))
t.Execute(w,"")
}
func main() {
// 设置处理静态资源
http.Handle("/static/",http.StripPrefix("/static/",http.FileServer(http.Dir("views/static"))))
// 直接通过a标签点击去往页面
http.Handle("/pages/",http.StripPrefix("/pages/",http.FileServer(http.Dir("views/pages"))))
http.HandleFunc("/index",IndexHandler)
http.HandleFunc("/login",controller0610.Login)
http.HandleFunc("/regist",controller0610.Regist)
// ajax检查用户名是否被注册
http.HandleFunc("/checkUsername",controller0610.CheckUsername)
// 获取所有图书
http.HandleFunc("/getBooks",controller0610.GetBooks)
// 新增图书
http.HandleFunc("/addBook",controller0610.AddBook)
// 删除图书
http.HandleFunc("/deleteBook",controller0610.DeleteBookById)
// 回显给表单
http.HandleFunc("/getBookById",controller0610.GetBookById)
// 改图书
http.HandleFunc("/updateBookById",controller0610.UpdateBookById)
http.ListenAndServe(":8080",nil)
}
标签:http,nil,err,CRUD,改查,goweb,book,func,图书 来源: https://blog.csdn.net/m0_47119598/article/details/117775861