How to use Redis cache in Golang project?

Use Redis cache steps in Golang projects: Install dependencies: go get github.com/go-redis/redis/v9 Create Redis client: redis.NewClient(&redis.Options{}) Set key-value pair: client .Set(context.Background(), key, value, 0) Get the value from the cache: client.Get(context.Background(), key)

How to Using Redis cache in Golang projects?

Redis (Remote Dictionary Server) is an in-memory data structure storage that is ideal for caching purposes. Using Redis in Golang projects can significantly improve performance and shorten response times.

Dependency installation

Before you start using Redis, you need to install the dependencies in the project:

go get github.com/go-redis/redis/v9

Code sample

To illustrate how to install the dependencies in the Golang project Using Redis cache, let us create a simple example:

package main

import (
    "context"
    "fmt"
    "time"

    "github.com/go-redis/redis/v9"
)

func main() {
    // 创建 Redis 客户端
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // 如果设置了密码，在这里输入
        DB:       0,  // 使用的数据库号
    })

    // 设置一个键值对 (缓存密钥为 "message")
    err := client.Set(context.Background(), "message", "Hello, Redis!", 0).Err()
    if err != nil {
        panic(err)
    }

    // 稍后，从缓存中获取值
    val, err := client.Get(context.Background(), "message").Result()
    if err != nil {
        panic(err)
    }

    fmt.Println(val) // 输出: Hello, Redis!
}

Practical case

In practical applications, cache can be used to store frequently queried data, such as hot news, product information, etc. . For example, for an e-commerce website, we can cache product details to avoid querying the database every time the user visits:

// 在数据库中获取商品详情
func getProductDetails(productId int) (*Product, error) {
    // 从数据库查询商品详情
    product, err := db.GetProductDetails(productId)
    if err != nil {
        return nil, err
    }

    // 将详情缓存到 Redis 中，设置过期时间为 5 分钟
    client.Set(context.Background(), fmt.Sprintf("product:%d", productId), product, 5*time.Minute)

    return product, nil
}

// 从 Redis 获取商品详情
func getCachedProductDetails(productId int) (*Product, error) {
    // 从 Redis 中获取详情
    val, err := client.Get(context.Background(), fmt.Sprintf("product:%d", productId)).Result()
    if err != nil {
        if errors.Is(err, redis.Nil) {
            // 如果缓存中不存在，则返回 nil
            return nil, nil
        }
        return nil, err
    }

    // 将缓存中的 JSON 字符串反序列化为 Product 对象
    product := &Product{}
    if err := json.Unmarshal([]byte(val), &product); err != nil {
        return nil, err
    }

    return product, nil
}

// 检查缓存中是否存在商品详情
func hasProductDetailsInCache(productId int) bool {
    // 检查缓存中是否存在键
    return client.Exists(context.Background(), fmt.Sprintf("product:%d", productId)).Val() > 0
}

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