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  • Go Web --- 创建一个Article的增删改查

      掌握数据的增删改查之后,就可以做一些小demo,巩固一下基础,让语法更加熟练,所以下面是按照Go web编程里面的文章管理操作,写的一个代码:

    package main
    
    import (
    	"database/sql"
    	"fmt"
    	_ "github.com/go-sql-driver/mysql"
    )
    
    type Article struct {
    	Id         int
    	Title      string
    	Content    string
    	Author     string
    	CreateTime string
    }
    
    var db *sql.DB  //注意db的类型,声明成全局变量是为了让所有的方法和函数都能使用
    var err error
    
    //init会在主函数之前执行
    func init() {
    	dsn := "root:123456@tcp(127.0.0.1:3306)/test?charset=utf8"
    	db, err = sql.Open("mysql", dsn)
    	CheckError(err)
    }
    
    func CheckError(err interface{}) {
    	if err != nil {
    		panic(err)
    	}
    }
    
    func (article *Article) AddArticle() bool {
    	str := "insert into article (title,content,author,create_time) values (?,?,?,?)"
    	stmt, err := db.Prepare(str)
    	CheckError(err)
    	result, err := stmt.Exec(article.Title, article.Content, article.Author, article.CreateTime)
    	CheckError(err)
    	if num, _ := result.RowsAffected(); num > 0 {
    		id, _ := result.LastInsertId()
    		fmt.Println("Add article", id, " success")
    		return true
    	} else {
    		fmt.Println("Add article", article.Id, " failed")
    		return false
    	}
    }
    
    func (article *Article) DeleteArticle() bool {
    	str := "delete from article where id=?"
    	stmt, err := db.Prepare(str)
    	CheckError(err)
    	result, err := stmt.Exec(article.Id)
    	CheckError(err)
    	if num, _ := result.RowsAffected(); num > 0 {
    		fmt.Println("delete article", article.Id, " success")
    		return true
    	} else {
    		fmt.Println("delete article", article.Id, " failed")
    		return false
    	}
    }
    
    func GetArticleById(id int) (Article, error) {
    	article := Article{Id: id}
    	str := "select title,content,author,create_time from article where id=?"
    	stmt, err := db.Prepare(str)
    	CheckError(err)
    	stmt.QueryRow(id).Scan(&article.Title, &article.Content, &article.Author, &article.CreateTime)
    	return article, nil
    }
    
    func GetArticleList(start, offset int) []Article {
    	var articles []Article
    	str := "select id,title,content,author,create_time from article limit ?,?"
    	stmt, _ := db.Prepare(str)
    	rows, err := stmt.Query(start, offset)
    	CheckError(err)
    	for rows.Next() {
    		article := Article{}
    		rows.Scan(&article.Id, &article.Title, &article.Content, &article.Author, &article.CreateTime)
    		articles = append(articles, article)
    	}
    	rows.Close()
    	return articles
    }
    
    func (article *Article) UpdateArticle() bool {
    	str := "update article set title=?,content=?,author=?,create_time=? where id=?"
    	stmt, _ := db.Prepare(str)
    	result, err := stmt.Exec(article.Title, article.Content, article.Author, article.CreateTime, article.Id)
    	CheckError(err)
    	if num, _ := result.RowsAffected(); num > 0 {
    		return true
    	} else {
    		return false
    	}
    }
    
    func main() {
    
    }
    

      

      

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  • 原文地址:https://www.cnblogs.com/-beyond/p/9325280.html
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