Golang. Bulk acquisition of cached values in Redis

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Using Redis's pipeline, when retrieving the key value in Redis in bulk, the error, analysis found that when the batch acquisition, exec, will return two values: nil and Redis. Nil,

In this case, the use of conventional if Err!=nil judgment method to determine errors, will be error.

Test code:

package mainimport ("github.com/go-redis/redis""log""strconv")func main() {client := redis.NewClient(&redis.Options{Addr:     "localhost:6379",Password: "", // no password setDB:       0,  // use default DBNetwork:  "tcp",PoolSize: 50,})if _, err := client.Ping().Result(); err != nil {panic(err)}pipe := client.Pipeline()log.Println("所有的key都存在:")for i := 0; i < 4; i++ {key := "n:" + strconv.FormatInt(int64(i), 10)pipe.Get(key)}result, err := pipe.Exec()log.Println(result)log.Println(err == nil)log.Println(err == redis.Nil)log.Println("有不存在的key:")for i := 0; i < 5; i++ {key := "n:" + strconv.FormatInt(int64(i), 10)pipe.Get(key)}result, err = pipe.Exec()log.Println(result)log.Println(err == nil)log.Println(err == redis.Nil)defer client.Close()}

Operation Result:

As you can see, if there is a nonexistent key in the bulk fetch key, the return will be redis. Nil, otherwise the return is nil.