sets类型及操作
Set是集合，它是string类型的无序集合。set是通过hash table实现的，添加，删除和查找复杂度都是0（1）。对集合我们可以取并集、交集、差集。通过这些操作我们可以实现sns中的好友推荐和blog的tag功能。
sadd:向集合中添加一个元素，通名称为key的set中添加元素。
| [toto@localhost bin]$ ./redis-cli 127.0.0.1:6379> sadd myset1 one (integer) 1 127.0.0.1:6379> sadd myset1 two (integer) 1 127.0.0.1:6379> sadd myset1 two 再次添加的时候添加不成功了。 (integer) 0 127.0.0.1:6379> |
通过smembers查看集合中有哪些元素
| 127.0.0.1:6379> smembers myset1 1) "two" 2) "one" 127.0.0.1:6379> |
srem:删除名称为key的set中的元素，删除成功返回1，删除失败返回0
| 127.0.0.1:6379> smembers myset2 1) "two" 2) "one" 3) "three" 127.0.0.1:6379> srem myset2 two (integer) 1 127.0.0.1:6379> srem myset2 two (integer) 0 127.0.0.1:6379> smembers myset2 1) "one" 2) "three" 127.0.0.1:6379> |
spop:无法指定弹出元素，是随机返回并删除名称为key的set中一个元素。
| 127.0.0.1:6379> sadd myset3 one (integer) 1 127.0.0.1:6379> sadd myset3 two (integer) 1 127.0.0.1:6379> sadd myset3 three (integer) 1 127.0.0.1:6379> sadd myset3 four (integer) 1 127.0.0.1:6379> sadd myset3 five (integer) 1 127.0.0.1:6379> smembers myset3 1) "four" 2) "three" 3) "one" 4) "two" 5) "five" 127.0.0.1:6379> spop myset3 //随机弹出的是three "three" 127.0.0.1:6379> smembers myset3 1) "one" 2) "four" 3) "five" 4) "two" 127.0.0.1:6379> spop myset3 //随机弹出的是four "four" 127.0.0.1:6379> smembers myset3 1) "one" 2) "five" 3) "two" 127.0.0.1:6379> |
sdiff:两个集合的差集。
返回所有给定key与第一个key的差集。
| 127.0.0.1:6379> smembers myset3 1) "one" 2) "four" 3) "five" 4) "two" 127.0.0.1:6379> spop myset3 "four" 127.0.0.1:6379> smembers myset3 1) "one" 2) "five" 3) "two" 127.0.0.1:6379> sadd myset2 three (integer) 1 127.0.0.1:6379> sadd myset2 four (integer) 1 127.0.0.1:6379> sadd myset2 one (integer) 1 127.0.0.1:6379> smembers myset2 1) "one" 2) "four" 3) "three" 127.0.0.1:6379> sdiff myset2 myset3 //去除myset2中含有与myset3元素的值。 1) "three" 2) "four" 127.0.0.1:6379> |
sdiffstore:返回所有给定key与第一个key的差集，并将结果存为另一个key.
sdiffstore myset4 myset2 myset3表示的意思是将myset3和myset2的差集存储到myset4里面。
| 127.0.0.1:6379> sadd myset2 one (integer) 1 127.0.0.1:6379> sadd myset2 two (integer) 1 127.0.0.1:6379> sadd myset2 three (integer) 1 127.0.0.1:6379> sadd myset3 one (integer) 1 127.0.0.1:6379> sadd myset3 two (integer) 1 127.0.0.1:6379> sadd myset3 three (integer) 1 127.0.0.1:6379> sadd myset3 four (integer) 1 127.0.0.1:6379> sadd myset3 five (integer) 1 127.0.0.1:6379> sadd myset3 six (integer) 1 127.0.0.1:6379> sdiff myset2 myset3 (empty list or set) 127.0.0.1:6379> sdiff myset3 myset2 //显示myset3中含有myset2的元素 1) "six" 2) "five" 3) "four" 127.0.0.1:6379> sdiffstore myset4 myset3 myset2将myset3和myset2的差集存入myset4中 (integer) 3 127.0.0.1:6379> smembers myset4 1) "six" 2) "five" 3) "four" 127.0.0.1:6379> |
sinter:
返回所有给定key的交集
sinterstore将取出的差集存入到另外的一个集合中。
| 127.0.0.1:6379> sadd myset1 one (integer) 1 127.0.0.1:6379> sadd myset1 two (integer) 1 127.0.0.1:6379> sadd myset2 two (integer) 1 127.0.0.1:6379> sadd myset2 three (integer) 1 127.0.0.1:6379> sadd myset2 four (integer) 1 127.0.0.1:6379> sadd myset2 five (integer) 1 127.0.0.1:6379> sadd myset3 four (integer) 1 127.0.0.1:6379> sadd myset3 five (integer) 1 127.0.0.1:6379> sadd myset3 six (integer) 1 127.0.0.1:6379> sadd myset3 seven (integer) 1 127.0.0.1:6379> smembers myset1 1) "two" 2) "one" 127.0.0.1:6379> smembers myset2 1) "four" 2) "three" 3) "five" 4) "two" 127.0.0.1:6379> smembers myset3 1) "seven" 2) "four" 3) "six" 4) "five" 127.0.0.1:6379> sinter myset3 myset2 1) "four" 2) "five" 127.0.0.1:6379> sinterstore myset6 myset3 myset2 (integer) 2 127.0.0.1:6379> smembers myset6 1) "four" 2) "five" 127.0.0.1:6379> |
sunion:表示插入并集。
返回所有给定key的并集。
| 127.0.0.1:6379> sadd myset1 one (integer) 1 127.0.0.1:6379> sadd myset2 two (integer) 1 127.0.0.1:6379> sadd myset1 two (integer) 1 127.0.0.1:6379> sadd myset2 three (integer) 1 127.0.0.1:6379> sadd myset2 four (integer) 1 127.0.0.1:6379> sunion myset1 myset2 查看并集 1) "three" 2) "two" 3) "four" 4) "one" 127.0.0.1:6379> sunionstore myset7 myset1 myset2 将并集的结果存入myset7中 (integer) 4 //返回值是4表示成功将4个元素插入myset7中 127.0.0.1:6379> smembers myset1 1) "two" 2) "one" 127.0.0.1:6379> smembers myset2 1) "three" 2) "two" 3) "four" 127.0.0.1:6379> smembers myset7 1) "three" 2) "two" 3) "four" 4) "one" 127.0.0.1:6379> |
smove:从第一个key对应的set中移除member并添加到第二个对应的set中。（将第一个集合中的元素剪切下来放入第二个元素中）
将smove myset2 myset7 three表示：myset2中的three元素扔到myset7中
| 127.0.0.1:6379> smembers myset1 1) "two" 2) "one" 127.0.0.1:6379> smembers myset2 1) "three" 2) "two" 3) "four" 127.0.0.1:6379> sadd myset1 five (integer) 1 127.0.0.1:6379> smembers myset8 (empty list or set) 127.0.0.1:6379> smove myset1 myset8 two 将myset1中的two元素移动到myset8中 (integer) 1 127.0.0.1:6379> smembers myset8 1) "two" 127.0.0.1:6379> smembers myset1 1) "five" 2) "one" 127.0.0.1:6379> |
scard返回名称为key的set的元素个数。(看集合中的元素个数)
| 127.0.0.1:6379> smembers myset1 看myset1集合中的元素有哪些 1) "five" 2) "one" 127.0.0.1:6379> smembers myset2 看myset2集合中的元素有哪些 1) "three" 2) "two" 3) "four" 127.0.0.1:6379> smembers myset8 看myset8集合中的元素有哪些 1) "two" 127.0.0.1:6379> scard myset1 查看myset1中的元素个数 (integer) 2 127.0.0.1:6379> scard myset2 查看myset2中的元素个数 (integer) 3 127.0.0.1:6379> scard myset8 (integer) 1 127.0.0.1:6379> |
sismember:测试member是否是名称为key的set的元素。（判断某个元素是否是某个集合中的元素，是返回1，不是返回0）
| 127.0.0.1:6379> smembers myset1 1) "five" 2) "one" 127.0.0.1:6379> sismember myset1 one 判断one是否是myset1中的元素 (integer) 1 127.0.0.1:6379> sismember myset1 two 判断two是否是myset1中的元素 (integer) 0 127.0.0.1:6379> |
srandmember:随机返回名称为key的set的一个元素，但不删除元素。
| 127.0.0.1:6379> smembers myset1 1) "five" 2) "one" 127.0.0.1:6379> srandmember myset7 "three" 127.0.0.1:6379> srandmember myset7 "two" 127.0.0.1:6379> srandmember myset7 "four" 127.0.0.1:6379> srandmember myset7 "three" |
Sorted sets类型及操作
Sortedset是set的一个升级版本，它在set的基础上增加了一个顺序属性，这一属性在添加修改元素的时候可以指定，每次指定后，zset会自动重新按新的值调整顺序。可以理解为由两列的mysql表，一列存value，一列存顺序。操作中key理解为zset的名字。
zadd：向名称为key的zset中添加元素member,score用于排序。如果该元素存在，则更新器顺序。语法：zadd set名称 顺序 值
| 127.0.0.1:6379> zadd myzset 1 "one" (integer) 1 127.0.0.1:6379> zadd myzset 2 "two" (integer) 1 127.0.0.1:6379> zadd myzset 3 "two" (integer) 0
这里的0 -1表示顺序号 withscores表示的意思是带上顺序号。 127.0.0.1:6379> zrange myzset 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "3" 127.0.0.1:6379>
再如： 127.0.0.1:6379> zadd sset1 1 two (integer) 1 127.0.0.1:6379> zadd sset1 2 two (integer) 0 127.0.0.1:6379> zadd sset1 3 two (integer) 0 127.0.0.1:6379> zadd sset1 1 one (integer) 1 127.0.0.1:6379> zrange sset1 0 -1 1) "one" 2) "two" 127.0.0.1:6379> zrange sset1 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "3" 127.0.0.1:6379> |
zrem:删除名称为key的zset中的元素member
| 127.0.0.1:6379> zrange sset1 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "3" 127.0.0.1:6379> zrem sset1 two (integer) 1 127.0.0.1:6379> zrange sset1 0 -1 withscores 1) "one" 2) "1" 127.0.0.1:6379> |
zincrby:如果在名称为key的zset中已经存在元素member，则该元素的score增加increment,否则向该集合中添加该元素，其score的值为increment。
| 127.0.0.1:6379> zrange sset1 0 -1 withscores 1) "one" 2) "1" 127.0.0.1:6379> zincrby sset1 2 one //将one的顺序号增加3，同样可以减2 "3" //表示one的顺序号变成了3 127.0.0.1:6379> zrange sset1 0 -1 withscores 1) "one" 2) "3" //one的序号变成了3 127.0.0.1:6379> |
zrank:返回名称为key的zset中的member元素的排名。（按score从小到大排序）即下标。（返回的是索引值，和序号值是有差别的）
| 127.0.0.1:6379> zadd sset2 1 one (integer) 1 127.0.0.1:6379> zadd sset2 2 two (integer) 1 127.0.0.1:6379> zadd sset2 3 three (integer) 1 127.0.0.1:6379> zadd sset2 4 four (integer) 1 127.0.0.1:6379> zadd sset2 5 five (integer) 1 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "three" 6) "3" 7) "four" 8) "4" 9) "five" 10) "5" 127.0.0.1:6379> zrank sset2 four (integer) 3 //这里的3表示的是索引值而不是序号值。 127.0.0.1:6379> |
zrevrank：返回名称为key的zset中member元素的排名。（按score从大到小排序）即下标。
| 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "three" 6) "3" 7) "four" 8) "4" 9) "five" 10) "5" 127.0.0.1:6379> zrevrank sset2 four //获得four的逆向索引 (integer) 1 127.0.0.1:6379> zrevrank sset2 two //获得two的逆向索引 (integer) 3 |
zrevrange:返回名称为key的zset(按score从大到小顺序)中的index从start到end的所有元素。(也就是说是反向排序)
| 127.0.0.1:6379> zrevrange sset2 0 -1 withscores 1) "five" 2) "5" 3) "four" 4) "4" 5) "three" 6) "3" 7) "two" 8) "2" 9) "one" 10) "1" 127.0.0.1:6379> |
zrangebyscore:找到序号在指定范围内的元素
| 127.0.0.1:6379> zrevrange sset2 0 -1 withscores 1) "five" 2) "5" 3) "four" 4) "4" 5) "three" 6) "3" 7) "two" 8) "2" 9) "one" 10) "1" 127.0.0.1:6379> zrangebyscore sset2 2 4 withscores 1) "two" 2) "2" 3) "three" 4) "3" 5) "four" 6) "4" 127.0.0.1:6379> |
zcount:返回集合中score在给定区间的数量。
| 127.0.0.1:6379> zrevrange sset2 0 -1 withscores 1) "five" 2) "5" 3) "four" 4) "4" 5) "three" 6) "3" 7) "two" 8) "2" 9) "one" 10) "1" 127.0.0.1:6379> zcount sset2 2 4 表示包括区间值 (integer) 3 127.0.0.1:6379> zcount sset2 4 5 表示包括区间值 (integer) 2 127.0.0.1:6379> |
zcard:返回集合中的所有元素的个数
| 127.0.0.1:6379> zrevrange sset2 0 -1 withscores 1) "five" 2) "5" 3) "four" 4) "4" 5) "three" 6) "3" 7) "two" 8) "2" 9) "one" 10) "1" 127.0.0.1:6379> zcard sset2 (integer) 5 127.0.0.1:6379> |
zremrangebyrank:删除集合中排名在给定区间的元素（按照索引来删除）。
| 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "three" 6) "3" 7) "four" 8) "4" 9) "five" 10) "5" 127.0.0.1:6379> zremrangebyrank sset2 2 3 //注意这里的2 3表示的是索引 (integer) 2 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "five" 6) "5" 127.0.0.1:6379> |
zremrangebyscore:删除集合中score在给定区间的元素（表示的是按照顺序删除）。
| 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "five" 6) "5" 127.0.0.1:6379> zremrangebyscore sset2 3 4 //没有删除成功的时候返回0 (integer) 0 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "five" 6) "5" 127.0.0.1:6379> zremrangebyscore sset2 2 5 //删除序号为2到5之间的元素 (integer) 2 127.0.0.1:6379> zrange sset2 0 -1 withscores 1) "one" 2) "1" 127.0.0.1:6379> |
