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Cluster cluster addslots(集群 槽位) cluster count failure reports(集群計(jì)數(shù)失敗報(bào)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(diǎn)) cluster replicate(集群復(fù)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

GETRANGE key start end

自2.4.0起可用。

時(shí)間復(fù)雜度: O(N)其中N是返回字符串的長(zhǎng)度。復(fù)雜度最終取決于返回的長(zhǎng)度,但是因?yàn)閺默F(xiàn)有字符串創(chuàng)建子字符串非常便宜,所以對(duì)于小字符串它可以被認(rèn)為是O(1)。

警告:此命令已重命名為 GETRANGE,它SUBSTR在 Redis 版本中調(diào)用<= 2.0。

返回存儲(chǔ)在的字符串值的子字符串key,由偏移量startend(都包含在內(nèi))確定??梢允褂秘?fù)偏移來(lái)提供從字符串末尾開(kāi)始的偏移量。所以-1表示最后一個(gè)字符,-2表示倒數(shù)第二個(gè)字符等等。

該函數(shù)通過(guò)將結(jié)果范圍限制為字符串的實(shí)際長(zhǎng)度來(lái)處理超出范圍的請(qǐng)求。

返回值

批量字符串回復(fù)

例子

redis>  SET mykey "This is a string" "OK" redis>  GETRANGE mykey 0 3 "This" redis>  GETRANGE mykey -3 -1 "ing" redis>  GETRANGE mykey 0 -1 "This is a string" redis>  GETRANGE mykey 10 100 "string"

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