go操作mysql

前言：

本文主要介绍如何通过database/sql包操作mysql

一.引入包

import (
   "database/sql"
   _ "github.com/go-sql-driver/mysql" //mysql驱动
)

二.创建连接

func main() {
   dsn := "root:[email protected]:3306/d_liudutui?charset=utf-8"
   conn, err := sql.Open("mysql",dsn)
   db = conn
   if err != nil {
      panic(err)
   }
   defer db.Close()
}

1.dsn格式: username:password@tcp(ip:port)/dbname

2.程序结束时关闭连接

三.CURD

1.添加  sql预编译->exec()执行

func Create() {
   stmt, err := db.Prepare("INSERT INTO t_user (`name`,gender) VALUES (?,?)")
   defer stmt.Close()
   if err != nil {
      panic(err)
   }
   ret, err := stmt.Exec("kunkun", 1)
   if err != nil {
      panic(err)
   }
   fmt.Println(ret.RowsAffected())
}

2.删除  sql预编译->exec()执行

func Delete() {
   stmt, err := db.Prepare("DELETE FROM t_user WHERE id = ?")
   if err != nil {
      panic(err)
   }
   ret, err := stmt.Exec("1")
   if err != nil {
      panic(err)
   }
   fmt.Println(ret.RowsAffected())
}

3.修改  sql预编译->exec()执行

func Update() {
   stmt, err := db.Prepare("UPDATE t_user SET `name` = ? WHERE id = ?")
   if err != nil {
      panic(err)
   }
   ret, err := stmt.Exec("new_name", 1)
   if err != nil {
      panic(err)
   }
   fmt.Println(ret.RowsAffected())
}

4.查询 

sql预编译->Query()查询->Next()遍历查询结果->Scan()获取查询结果

func Query() {
   stmt, err := db.Prepare("SELECT * FROM t_user WHERE id in (?,?,?)")
   if err != nil {
      panic(err)
   }
   rows, err := stmt.Query(1,2,3)
   if err != nil {
      panic(err)
   }
   type User struct {
      ID string
      Name string
      Gender int
   }
   var list []*User
   for rows.Next() {
      user := User{}
      err := rows.Scan(&user.ID, &user.Name, &user.Gender)
      if err != nil {
         panic(err)
      }
      list = append(list, &user)
   }
}