【Go】Redisの使い方

2023-07-052023-07-06

Redisの使い方を毎回忘れるので

GitHub

GitHub – redis/go-redis: Redis Go client Redis Go client. Contribute to redis/go-redis development by creating an account on GitHub.

set, get

package main

import (
	"context"
	"fmt"
	"time"

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

func main() {
	rcli := redis.NewClient(&redis.Options{
		Addr:     "localhost:16379",
		Password: "",
		DB:       0,
	})
	ctx := context.Background()
	if err := rcli.Ping(context.Background()).Err(); err != nil {
		panic(err)
	}

	// key, value, expのセット
	if err := rcli.Set(ctx, "test-key", "test-value", 100*time.Millisecond).Err(); err != nil {
		panic(err)
	}
	got, err := rcli.Get(ctx, "test-key").Result()
	if err == redis.Nil {
		fmt.Println("key not exist:", err)
	} else if err != nil {
		panic(err)
	} else {
		fmt.Println("val:", got) // val: test-value
	}

	// 有効期限を過ぎてみる
	time.Sleep(150 * time.Millisecond)

	got, err = rcli.Get(ctx, "test-key").Result()
	if err == redis.Nil {
		fmt.Println("key not exist:", err) // key not exist: redis: nil
	} else if err != nil {
		panic(err)
	} else {
		fmt.Println("val:", got)
	}
}

Get All Keys

	var cursor uint64
	for {
		fmt.Println("in loop")
		var keys []string
		var err error
    // 最後の０は「何個ずつ取得する？」
		keys, cursor, err = rcli.Scan(ctx, cursor, "prefix*", 0).Result()
		if err != nil {
			panic(err)
		}
		for _, key := range keys {
			fmt.Println("key", key)
		}

		if cursor == 0 { // no more keys
			break
		}
	}