Go应该如何实现二级缓存

package main
​
import (
    "fmt"
    _"github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)
​
type Human struct {
    Name string `db:"name"`
    Age int `db:"age"`
}
func main() {
    var cmd string
    for{
        fmt.Println("请输入命令：")
        fmt.Scan(&cmd)
​
        switch cmd{
        case "getall":
            //显示所有人的信息
            GetAllPeople()
        case "exit":
            //退出程序
            goto GAMEOVER
        default:
            fmt.Println("输入的命令有误，请重新输入！")
        }
    }
    GAMEOVER:
    fmt.Println("GAME OVER")
​
}
​
func GetAllPeople()  {
    fmt.Println("allPeople")
    //先尝试拿缓存
    GetPeopleFromRedis()
    db, _ := sqlx.Connect("mysql", "root:123456@tcp(localhost:3306)/mydb")
    defer db.Close()
​
    var people []Human
    err := db.Select(&people, "select name,age from person")
    if err!=nil{
        fmt.Println("查询失败!err=",err)
    }
    fmt.Println(people)
    
    CachePeople2Redis(people)
}

type Human struct {
    Name string `db:"name"`
    Age int `db:"age"`
}

db, _ := sqlx.Connect("mysql", "root:123456@tcp(localhost:3306)/mydb")

func HandleError(err error,why string)  {
    if err != nil{
        fmt.Println(err,why)
        os.Exit(1)
    }
}

func CachePeople2Redis(people []Human)  {
    conn, _ := redis.Dial("tcp", "localhost:6379")
    defer conn.Close()
    for _,human := range people{
        humanStr := fmt.Sprint(human)
        _, err := conn.Do("rpush", "people", humanStr)
        if err != nil{
            fmt.Println("缓存失败(rpush people),err=",err)
            return
        }
    }
    _, err := conn.Do("expire", "people", 66)
    if err!=nil{
        HandleError(err,"@expire people 60")
    }
    fmt.Println("缓存成功！")
}

127.0.0.1:6379> lrange people 0 -1
1) "{\xe5\xa4\xa7\xe6\x89\xac 21}"
2) "{\xe5\xb0\x8f\xe9\xa3\x9e 21}"
3) "{\xe5\xa4\xa7\xe7\xba\xa2\xe8\xa2\x8d 1}"
4) "{\xe5\xb0\x8f\xe8\x8a\xb3 18}"

127.0.0.1:6379> lrange people 0 -1
(empty list or set)

func GetPeopleFromRedis() (peopleStrs []string) {
    //连数据库 
    conn, _ := redis.Dial("tcp", "localhost:6379")
    //延迟关闭
    defer conn.Close()
    //执行命令
    reply, err := conn.Do("lrange", "people", 0, -1)
    //处理错误
    HandleError(err,"@lrange people 0 -1")
    //类型转换
    peopleStrs, err = redis.Strings(reply, err)
    //打印结果
    fmt.Println("缓存拿取结果：",peopleStrs,err)
    return
}