redis数据操作----zset

zset

• sorted set，有序数据
• 元素为string类型
• 元素具备唯一性，不重复
• 每个元素都关联一个double类型的score，表示权重，通过权重将元素从小到大排列
• 元素的score可以相同

命令

• 添加

zadd key score member [score member ...]

例如：添加成员

127.0.0.1:6379> zadd z1 1 'jane' 2 'tony'
(integer) 2

例如：添加重复的成员

127.0.0.1:6379> zadd z1 3 'brown' 4 'walker' 5 'walker' 6 'walker'
(integer) 2

• 通过score返回有序集合指定区间内的成员(递增)，[withscores]表示返回的集合是否显示score，-inf +inf表示区间无限

zrangebyscore key min max [withscores]

例如:求z1集合里的所有成员

127.0.0.1:6379> zrangebyscore z1 -inf +inf
1) "jane"
2) "tony"
3) "brown"
4) "walker"
127.0.0.1:6379> zrangebyscore z1 -inf +inf withscores
1) "jane"
2) "1"
3) "tony"
4) "2"
5) "brown"
6) "3"
7) "walker"
8) "6"

 从结果可以看出来，实际只添加了2个元素，连续添加的2个walker元素添加无效

• 通过score返回有序集合指定区间内的成员(递减)

zrevrangebyscore key min max [withscores]

例如:求z1集合里的所有成员

127.0.0.1:6379> zrevrangebyscore z1 +inf -inf 
1) "walker"
2) "brown"
3) "tony"
4) "jane"
127.0.0.1:6379> zrevrangebyscore z1 +inf -inf withscores
1) "walker"
2) "6"
3) "brown"
4) "3"
5) "tony"
6) "2"
7) "jane"
8) "1"

• 返回指定范围内的元素(递增)

zrange key start stop [withscores]

例如：求z1(0,-1) ,z1(1,2)

127.0.0.1:6379> zrange z1 0 -1
1) "jane"
2) "tony"
3) "brown"
4) "walker"
127.0.0.1:6379> zrange z1 0 -1 withscores
1) "jane"
2) "1"
3) "tony"
4) "2"
5) "brown"
6) "3"
7) "walker"
8) "6"
127.0.0.1:6379> zrange z1 1 2
1) "tony"
2) "brown"
127.0.0.1:6379> zrange z1 1 2 withscores
1) "tony"
2) "2"
3) "brown"
4) "3"

• 返回指定范围内的元素(递减)

zrevrange key start stop [withscores]

127.0.0.1:6379> zrevrange z1 0 -1 
1) "walker"
2) "brown"
3) "tony"
4) "jane"
127.0.0.1:6379> zrevrange z1 0 -1 withscores
1) "walker"
2) "6"
3) "brown"
4) "3"
5) "tony"
6) "2"
7) "jane"
8) "1"
127.0.0.1:6379> zrevrange z1 1 2
1) "brown"
2) "tony"
127.0.0.1:6379> zrevrange z1 1 2 withscores
1) "brown"
2) "3"
3) "tony"
4) "2"

• 返回元素个数

zcard key 

例如：求z1的元素个数

127.0.0.1:6379> zrange z1 0 -1
1) "jane"
2) "tony"
3) "brown"
4) "walker"
127.0.0.1:6379> zcard z1
(integer) 4

• 返回有序key中，score值在min和max之间元素

zcount key min max

例如：求z1的score值在0和4之间的元素，z1的score值在1和4之间的元素，z1的score值在1和6之间

127.0.0.1:6379> zrange z1 0 10 withscores
1) "jane"
2) "1"
3) "tony"
4) "2"
5) "brown"
6) "3"
7) "walker"
8) "6"
127.0.0.1:6379> zcount z1 0 4 
(integer) 3
127.0.0.1:6379> zcount z1 1 4
(integer) 3
127.0.0.1:6379> zcount z1 1 6
(integer) 4

• 返回有序key中，成员member的score值

zscore key member

例如：求z1集合中成员jane的score值

127.0.0.1:6379> zscore z1 jane
"1"

实例：添加一个薪水的zset数据

127.0.0.1:6379> zadd salary 3000 jane 5000 tony 12000 brown 8000 walker
(integer) 4
127.0.0.1:6379> zadd salary 3000 tom
(integer) 1
127.0.0.1:6379> zrangebyscore salary -inf +inf withscores
 1) "jane"
 2) "3000"
 3) "tom"
 4) "3000"
 5) "tony"
 6) "5000"
 7) "walker"
 8) "8000"
 9) "brown"
10) "12000"

例如：求薪水大于3000，等于8000的人

127.0.0.1:6379> zrangebyscore salary (3000 8000
1) "tony"
2) "walker"
127.0.0.1:6379> zrangebyscore salary (3000 8000 withscores
1) "tony"
2) "5000"
3) "walker"
4) "8000"

例如：求薪水大于3000，小于8000的人

127.0.0.1:6379> zrangebyscore salary (3000 (8000
1) "tony"
127.0.0.1:6379> zrangebyscore salary (3000 (8000 withscores
1) "tony"
2) "5000"