ディレクトリ 検索
Cluster cluster addslots(集群 槽位) cluster count failure reports(集群计数失败报告) cluster countkeysinslot cluster delslots cluster failover cluster forget cluster getkeysinslot cluster info cluster keyslot(集群键槽) cluster meet cluster nodes(集群节点) cluster replicate(集群复制) 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
テキスト

GETRANGE key start end

自2.4.0起可用。

时间复杂度: O(N)其中N是返回字符串的长度。复杂度最终取决于返回的长度,但是因为从现有字符串创建子字符串非常便宜,所以对于小字符串它可以被认为是O(1)。

警告:此命令已重命名为 GETRANGE,它SUBSTR在 Redis 版本中调用<= 2.0

返回存储在的字符串值的子字符串key,由偏移量startend(都包含在内)确定。可以使用负偏移来提供从字符串末尾开始的偏移量。所以-1表示最后一个字符,-2表示倒数第二个字符等等。

该函数通过将结果范围限制为字符串的实际长度来处理超出范围的请求。

返回值

批量字符串回复

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"

前の記事: 次の記事: