Go语言连接Mysql数据库

package introduction1

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

func ConnMysql()  {
	connStr := "root:root@tcp(127.0.0.1:3306)/hups_go"
	db, err := sql.Open("mysql", connStr)
	if err != nil {
		fmt.Printf("Connect mysql fail: %s\n", err)
	} else { // 连接成功
		fmt.Println("Connect to mysql success")
	}
	defer db.Close()

	sqlQuery := "select * from user"
	rows, err := db.Query(sqlQuery)
	if err != nil {
		fmt.Printf("select fail: %s\n", err)
	}

	// var mapUser map[string]int
	// mapUser = make(map[string]int)

	var mapUser = make(map[string]int)

	for rows.Next() {
		var id int
		var userName string
		rows.Columns()
		err := rows.Scan(&id, &userName)
		if err != nil {
			fmt.Printf("get user info error: %s\n", err)
		}
		mapUser[userName] = id
	}

	for k, v := range mapUser {
		fmt.Println(k, v)
	}
}