命令行进入mysql后台需要输入用户名和密码，通过client工具定义好用户和密码，直接进入，省去输入用户和密码的麻烦。

package main

import (
	"os"
	"os/exec"
)

func main() {

	const (
		USER = "root"
		PASS = "pass"
		HOST = "127.0.0.1"
	)

	cmd := exec.Command("mysql", "-u"+USER, "-h"+HOST, "-p"+PASS)

	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	cmd.Run()
}