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Cluster cluster addslots(集群 槽位) cluster count failure reports(集群計數(shù)失敗報告) cluster countkeysinslot cluster delslots cluster failover cluster forget cluster getkeysinslot cluster info cluster keyslot(集群鍵槽) cluster meet cluster nodes(集群節(jié)點) cluster replicate(集群復制) cluster reset(集群重置) cluster saveconfig cluster set config epoch cluster setslot cluster slaves cluster slots readonly readwrite Connection auth echo ping quit select swapdb Geo geoadd geodist geohash geopos georadius georadiusbymember Hashes hdel hexists hget hgetall hincrby hincrbyfloat hkeys hlen hmget hmset hscan hset hsetnx hstrlen hvals HyperLogLog pfadd pfcount pfmerge Keys del dump exists expire expireat keys migrate move object persist pexpire pexpireat pttl randomkey rename renamenx restore scan sort touch ttl type unlink wait Lists blpop brpop brpoplpush lindex linsert llen lpop lpush lpushx lrange lrem lset ltrim rpop rpoplpush rpush rpushx Pub/Sub psubscribe publish pubsub punsubscribe subscribe unsubscribe Scripting eval evalsha script debug script exists script flush script kill script load Server bgrewriteaof bgsave client getname client kill client list client pause client reply client setname command command count command getkeys command info config get config resetstat config rewrite config set dbsize debug object debug segfault flushall flushdb info lastsave monitor role save shutdown slaveof slowlog time Sets sadd scard sdiff sdiffstore sinter sinterstore sismember smembers smove spop srandmember srem sscan sunion sunionstore Sorted Sets zadd zcard zcount zincrby zinterstore zlexcount zrange zrangebylex zrangebyscore zrank zrem zremrangebylex zremrangebyrank zremrangebyscore zrevrange zrevrangebylex zrevrangebyscore zrevrank zscan zscore zunionstore Strings append bitcount bitfield bitop bitpos decr decrby get getbit getrange getset incr incrby incrbyfloat mget mset msetnx psetex set setbit setex setnx setrange strlen Transactions discard exec multi unwatch watch
characters

SADD key member [member ...]

自1.0.0起可用。

時間復雜度: O(1)為每個元素添加,所以O(N)在用多個參數(shù)調用該命令時添加N個元素。

將指定的成員添加到存儲在的集合中key。指定的已經是該組成員的成員將被忽略。如果key不存在,則在添加指定成員之前創(chuàng)建一個新集。

當存儲的值key不是集合時,將返回錯誤。

返回值

整數(shù)回復:添加到集合中的元素數(shù)量,不包括集合中已經存在的所有元素。

歷史

  • >= 2.4:接受多個member參數(shù)。2.4之前的 Redis 版本只能為每個呼叫添加一個成員。

例子

redis>  SADD myset "Hello" (integer) 1 

redis>  SADD myset "World" (integer) 1 

redis>  SADD myset "World" (integer) 0 

redis>  SMEMBERS myset 1) "Hello" 2) "World"

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