redis的数据类型-zset

sorted sets是有序集合，它在set的基础上增加了顺序属性，可理解为有两列的mysql表。

• zadd
  添加元素score,member(如果值相同则更新排序号)

127.0.0.1:6379> srandmember myset3"five"127.0.0.1:6379> srandmember myset3"five"127.0.0.1:6379> srandmember myset3"four"127.0.0.1:6379> srandmember myset3"five"127.0.0.1:6379> zadd myzset 1 one(integer) 1127.0.0.1:6379> zadd myzset 2 two(integer) 1127.0.0.1:6379> zadd myzset 3 two(integer) 0127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "1"3) "two"4) "3"

• zrem
  删除

127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "1"3) "two"4) "3"127.0.0.1:6379> zrem myzset one(integer) 1127.0.0.1:6379> zrange myzset 0 -1 withscores1) "two"2) "3"

• zincrby
  对顺序号进行增加(存在元素则增加顺序号，不存在则创建元素)

127.0.0.1:6379> zrange myzset 0 -1 withscores1) "two"2) "3"127.0.0.1:6379> zincrby myzset 2 two"5"127.0.0.1:6379> zrange myzset 0 -1 withscores1) "two"2) "5"127.0.0.1:6379> zincrby myzset 2 one"2"127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "2"3) "two"4) "5"

• zrank
  按照元素的score从小到大进行排序，排序后返回查找元素的索引值

127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "2"3) "two"4) "5"127.0.0.1:6379> zadd myzset 4 three(integer) 1127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "2"3) "three"4) "4"5) "two"6) "5"127.0.0.1:6379> zrank myzset three(integer) 1

• zrevrank(
  (与zrank相反，降序)
• zrevrange
  降序排序

127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "2"3) "three"4) "4"5) "two"6) "5"127.0.0.1:6379> zrank myzset three(integer) 1127.0.0.1:6379> zrevrange myzset 0 -1 withscores1) "two"2) "5"3) "three"4) "4"5) "one"6) "2"

• zrangebyscore
  排序后返回score在给定范围内的元素

127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "2"3) "three"4) "4"5) "two"6) "5"127.0.0.1:6379> zrangebyscore myzset 2 4 withscores1) "one"2) "2"3) "three"4) "4"

• zcount
  score在给定范围内的数量

127.0.0.1:6379> zrange myzset 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> zcount myzset 2 3(integer) 2

• zcard
  返回所有元素个数

127.0.0.1:6379> zrange myzset 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> zcount myzset 2 3(integer) 2127.0.0.1:6379> zcard myzset(integer) 5

• zremrangebyrank
  删除给定区间的元素(区间指索引的区间)
  不要与zremrangebyscore方法混淆(它的区间指score下标的区间)

127.0.0.1:6379> zrange myzset 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 myzset 2 3(integer) 2127.0.0.1:6379> zrange myzset 0 -1 withscores1) "one"2) "1"3) "two"4) "2"5) "five"6) "5"