decr - [ Redis中文开发手册 ] - 在线原生手册

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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

文字

DECR key

自1.0.0起可用。

时间复杂度： O（1）

将存储的数字减key1。如果密钥不存在，则0在执行操作之前将其设置为。如果密钥包含错误类型的值或包含无法表示为整数的字符串，则会返回错误。该操作仅限于64位有符号整数。

有关增量/减量操作的额外信息，请参阅 INCR。

返回值

整数回复：key减量后的值

例子

redis> SET mykey "10" "OK" redis> DECR mykey (integer) 9 redis> SET mykey "234293482390480948029348230948" "OK" redis> DECR mykey ERR ERR value is not an integer or out of range