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什么是 Redis？

• Redis 是一个开源的内存数据库，支持多种数据结构，包括字符串、列表、集合、哈希和有序集合。由于 Redis 运行在内存中，读写速度极快，常被用于构建缓存系统、实时排行榜、会话存储和消息队列等高并发场景下的服务。
• 在这篇博客中，我们将介绍如何使用 Go 语言集成 Redis，构建高效的缓存和消息队列系统。

安装 Redis

• 安装 Redis： 你可以通过以下命令安装 Redis（适用于 Linux 和 macOS）：

sudo apt-get install redis-server

• 或者通过 Homebrew 安装：

brew install redis

启动 Redis 服务

redis-server

验证安装

• 可以通过以下命令进入 Redis CLI，验证 Redis 是否正常运行

redis-cli

安装 Go Redis 客户端

• 在 Go 项目中，我们将使用 go-redis/redis 这个流行的 Redis 客户端库。你可以通过以下命令安装：

go get github.com/go-redis/redis/v8

连接 redis

rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,
})

string 类型

1. set 设置 string 的值

func TestSetKey(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})err := rdb.Set(ctx, "name", "hello world", time.Second*1000).Err()if err != nil {panic(err)}fmt.Println("设置值成功")
}

2. get 获取 string 的值

func TestGetKey(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})result, err := rdb.Get(ctx, "name").Result()if err != nil {panic(err)}fmt.Println("result", result)
}

3. getset 获取到的值是上一次的值

func TestGetSet(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})result, err := rdb.GetSet(ctx, "name", "hello world").Result()if err != nil {panic(err)}fmt.Println(result)
}

4. setnx 如果值存在则不设置，如果不存在则设置

func TestSetNx(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})err := rdb.SetNX(ctx, "name", "hello set nex", time.Second*1000).Err()if err != nil {panic(err)}}

5. mget 批量获取值

func TestMGet(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})result, err := rdb.MGet(ctx, "name", "k1", "k2").Result()if err != nil {panic(err)}fmt.Println(result)
}

6. 批量设置

func TestMSet(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})err := rdb.MSet(ctx, "k1", "value1", "k2", "value2", "k3", "value3").Err()if err != nil {panic(err)}}

7. 自增

// 自增
func TestIncrBy(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})result, err := rdb.IncrBy(ctx, "money", 1).Result()if err != nil {panic(err)}fmt.Println(result)
}

8. 自减

func TestDecrBy(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})val, err := rdb.DecrBy(ctx, "money", 1).Result()if err != nil {panic(err)}fmt.Println(val)
}

9. 删除

func TestDel(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})err := rdb.Del(ctx, "k1").Err()if err != nil {panic(err)}
}

10. 设置过期时间

func TestExpire(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})rdb.Expire(ctx, "key2", 1000*time.Second)
}

哈希类型

1. HSet 设置哈希值

func TestHSet(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})result, err := rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log(result)err = rdb.HSet(ctx, "user", "name", "张德志").Err()if err != nil {panic(err)}t.Log("设置hash成功")
}

2. HGet 获取哈希值

func TestHGet(t *testing.T) {ctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err := rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Logf("连接数据库成功")result, err1 := rdb.HGet(ctx, "user", "name").Result()if err1 != nil {panic(err1)}t.Logf("获取值:%s", result)
}

3. TestHGetAll 获取所有哈希值

func TestHGetAll(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr: "127.0.0.1:6379",DB:   0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("连接数据库成功")result, err1 := rdb.HGetAll(ctx, "user").Result()if err1 != nil {panic(err1)}t.Log(result)
}

4. HIncrBy 哈希累加

func TestHIncrBy(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("数据库连接成功")count, err1 := rdb.HIncrBy(ctx, "user", "count", 2).Result()if err1 != nil {panic(err1)}t.Log(count)
}

5. HKeys 获取所有 keys

func TestHKeys(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("连接数据库成功")keys, err1 := rdb.HKeys(ctx, "user").Result()if err1 != nil {panic(err)}t.Log(keys)
}

6. HLen 查询字段数量

func TestHLen(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("连接数据库成功")result, err1 := rdb.HLen(ctx, "user").Result()if err1 != nil {panic(err1)}t.Log(result)}

7. HMGet 批量获取

func TestMGet(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.HMGet(ctx, "user", "name", "count").Result()if err1 != nil {panic(err)}t.Log(result)
}

8. HMSet 批量设置

func TestHMSet(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}data := make(map[string]interface{})data["name"] = "周华建"data["age"] = 44data["gender"] = "男"err = rdb.HMSet(ctx, "user", data).Err()if err != nil {panic(err)}
}

9. HDel 删除值

func TestHDel(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.HDel(ctx, "user", "name").Err()if err != nil {panic(err)}}

10. 检测是否存在

func TestHExists(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr: "127.0.0.1:6379",DB:   0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.HExists(ctx, "user", "name").Result()if err1 != nil {panic(err1)}t.Log(result)
}

List 类型

1. TestLPush 左侧插入

func TestLPush(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.LPush(ctx, "key", 1, 2, 3, 4, 5).Err()if err != nil {panic(err)}t.Log("插入成功")
}

2. 判断集合左侧是否可以插入，如果存在则不插入，如果不存在则插入

func TestLPushX(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.LPushX(ctx, "key", 6, 7, 8).Err()if err != nil {panic(err)}
}

3. 从右则删除一个值并返回删除后的值

func TestRPop(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}val, err1 := rdb.RPop(ctx, "key").Result()if err1 != nil {panic(err1)}t.Log(val)
}

4. RPush 从列表右则插入值

func TestRPush(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.RPush(ctx, "key", 12).Err()if err != nil {panic(err)}
}

5. LPop 从左侧删除

func TestLPop(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.LPop(ctx, "key").Result()if err1 != nil {panic(err1)}fmt.Println(result)
}

6. LLen 获取集合的长度

func TestLLen(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.LLen(ctx, "key").Result()if err1 != nil {panic(err1)}t.Log(result)
}

7. 遍历集合

func TestLRange(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.LRange(ctx, "key", 0, -1).Result()if err1 != nil {panic(err1)}t.Log(result)}

8. 删除数据

func TestLRem(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("数据库连接成功")err = rdb.LRem(ctx, "key", 0, -1).Err()if err != nil {panic(err)}t.Log("删除成功")}

9. 获取值的索引

func TestLIndex(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr: "127.0.0.1:6379",DB:   0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}val, err := rdb.LIndex(ctx, "key", 1).Result()if err != nil {panic(err)}t.Log(val)
}

set 集合

1. sadd 添中集合

func TestSAdd(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.SAdd(ctx, "set", 100).Err()if err != nil {panic(err)}t.Log("添加集合成功")
}

2. scard 获取集合元素个数

func TestSCard(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr: "127.0.0.1:6379",DB:   0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}t.Log("连接数据库成功")size, err := rdb.SCard(ctx, "set").Result()if err != nil {panic(err)}t.Log(size)
}

3.sIsmember 判断元素是否在集合中

func TestSIsMember(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}ok, _ := rdb.SIsMember(ctx, "key", 100).Result()if !ok {t.Log("集合不含令指定元素")return}t.Log("集合包含指定元素")
}

4. smembers 获取集合中所有的元素

func TestSMembers(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}values, err1 := rdb.SMembers(ctx, "set").Result()if err1 != nil {panic(err1)}t.Log(values)
}

5. srem 删除集合中元素

func TestSRem(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.SRem(ctx, "set", 100).Err()if err != nil {panic(err)}t.Log("删除成功")
}

6. SPop 随机删除并返回删除的值

func TestSPop(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}val, _ := rdb.SPop(ctx, "set").Result()t.Log(val)vals, _ := rdb.SPopN(ctx, "set", 5).Result()t.Log(vals)
}

可排序集合

1. zadd 添加一个或多个元素到集合，如果元素已经存在则更新分数

func TestZAdd(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr: "localhost:6379",DB:   0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.ZAdd(ctx, "zAdd", redis.Z{Score: 2.5, Member: "张德志"}).Err()if err != nil {panic(err)}t.Log("插入成功")
}

2. zcard 返回集合元素个数

func TestZCard(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}size, err1 := rdb.ZCard(ctx, "zAdd").Result()if err1 != nil {panic(err)}t.Log(size)}

3. zCount 获取某个区间的值

func TestZCount(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}size, err1 := rdb.ZCount(ctx, "zAdd", "1", "5").Result()if err1 != nil {panic(err1)}t.Log(size)}

4. ZIncrBy 增加元素的分数

func TestZIncrBy(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.ZIncrBy(ctx, "zAdd", 2, "张德志").Err()if err != nil {panic(err)}
}

5. zrange 返回集合中某个索引范围的元素

func TestZRange(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}result, err1 := rdb.ZRange(ctx, "zAdd", 0, -1).Result()if err1 != nil {panic(err1)}t.Log(result)}

6. ZRangeByScore 根据分数范围返回集合元素，元素根据分数从小到大排序，支持分页

func TestZRangeByScore(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}opt := redis.ZRangeBy{Min:    "2",Max:    "1000",Offset: 0,Count:  5,}vals, err1 := rdb.ZRangeByScore(ctx, "set", &opt).Result()if err1 != nil {panic(err1)}t.Log(vals)
}

7. 根据指定 key 删除元素

func TestZRem(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.ZRem(ctx, "zAdd", "张德志").Err()if err != nil {panic(err)}t.Log("删除成功")
}

10. ZRemRangeByRank 根据索引范围删除元素

func TestZRemRangeByRank(t *testing.T) {var err errorctx := context.Background()rdb := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "",DB:       0,})_, err = rdb.Ping(ctx).Result()if err != nil {panic(err)}err = rdb.ZRemRangeByRank(ctx, "zAdd", 0, 1).Err()if err != nil {panic(err)}t.Log("删除成功")
}

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