3.5.1-mysql2.go

//++++++++++++++++++++++++++++++++++++++++
// 《Go语言高级开发与实战》源码
//++++++++++++++++++++++++++++++++++++++++
// Author:廖显东（ShirDon）
// Blog:https://www.shirdon.com/
// 知乎：https://www.zhihu.com/people/shirdonl
// 公众号:源码大数据
// 仓库地址：https://gitee.com/shirdonl/goAdvanced
// 仓库地址：https://github.com/shirdonl/goAdvanced
//++++++++++++++++++++++++++++++++++++++++

package main

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

func main() {
	db, err := sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/hello")
	if err != nil {
		fmt.Println(err)
	}
	err = db.Ping()
	if err != nil {
		// 错误处理逻辑
	}
	defer db.Close()
	var (
		id    int
		phone string
	)
	//查询数据库
	rows, err := db.Query("select id, phone from user where id = ?", 3)
	if err != nil {
		log.Fatal(err)
	}
	//defer语句关闭数据库连接
	defer rows.Close()
	for rows.Next() {
		//通过Scan方法赋值
		err := rows.Scan(&id, &phone)
		if err != nil {
			log.Fatal(err)
		}
		log.Println(id, phone)
	}
	err = rows.Err()
	if err != nil {
		log.Fatal(err)
	}
}