Golang을 사용하여 캐시에 데이터를 쓰는 방법은 무엇입니까?

package main

import (
    "sync"
)

var cache = sync.Map{}

func main() {
    // 将 "key1" 映射到值 "value1"
    cache.Store("key1", "value1")

    // 检索映射到 "key1" 的值
    value, ok := cache.Load("key1")
    if !ok {
        // 如果键不存在，则返回 nil
        fmt.Println("Key not found")
        return
    }

    fmt.Println(value) // 输出："value1"
}

package main

import (
    "github.com/patrickmn/go-cache"
    "time"
)

var cache = cache.New(5*time.Minute, 10*time.Minute)

func main() {
    // 将 "key1" 映射到值 "value1"，并设置 5 分钟的超时
    cache.Set("key1", "value1", 5*time.Minute)

    // 检索映射到 "key1" 的值
    value, found := cache.Get("key1")
    if !found {
        // 如果键不存在，则返回 nil
        fmt.Println("Key not found")
        return
    }

    fmt.Println(value) // 输出："value1"
}

package main

import (
    "database/sql"
    "fmt"
    "github.com/patrickmn/go-cache"
    "time"
)

var (
    db     *sql.DB
    cache  = cache.New(5*time.Minute, 10*time.Minute)
)

func main() {
    // 打开数据库连接
    db, err := sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/database")
    if err != nil {
        panic(err)
    }

    // 检索用户数据并缓存
    rows, err := db.Query("SELECT * FROM users")
    if err != nil {
        panic(err)
    }

    for rows.Next() {
        var id int
        var name string
        if err := rows.Scan(&id, &name); err != nil {
            panic(err)
        }

        cache.Set(fmt.Sprintf("user:%d", id), name, cache.NoExpiration)
    }

    // 从缓存中检索用户姓名
    name, found := cache.Get("user:1")
    if found {
        fmt.Println(name) // 输出：John Doe
    } else {
        fmt.Println("Key not found")
    }
}