Redis數據類型：Zset( 有序集合)

Redis數據類型：Zset( 有序集合)

Zset是set的基礎上加了有序

127.0.0.1:6379> zadd myset 1 one 2 two 5 five
(integer) 3 #添加元素
127.0.0.1:6379> zrange myset
(error) ERR wrong number of arguments for 'zrange' command
127.0.0.1:6379> zrange myset 0 -1 #獲取元素
1) "one"
2) "two"
3) "five"
127.0.0.1:6379> zadd salary 2500 xiaohong
(integer) 1
127.0.0.1:6379> zadd salary 5000 panghu
(integer) 1
127.0.0.1:6379> zadd salary 7000 daxiong
(integer) 1
127.0.0.1:6379> zadd salary 1000 jingxiang
(integer) 1
127.0.0.1:6379> zrangebyscore salary -inf +inf
1) "jingxiang"    #從小到大排序
2) "xiaohong"
3) "panghu"
4) "daxiong"
127.0.0.1:6379> zrangebyscore salary -inf +inf withscores  #從小到大排序 並顯示工資
1) "jingxiang"
2) "1000"
3) "xiaohong"
4) "2500"
5) "panghu"
6) "5000"
7) "daxiong"
8) "7000"
127.0.0.1:6379> zrangebyscore salary -inf 4000 withscores #從小到大排序 限制右範圍
1) "jingxiang"
2) "1000"
3) "xiaohong"
4) "2500"
127.0.0.1:6379> zrem salary daxiong #刪除某個元素
(integer) 1
127.0.0.1:6379> zrange salary 0 -1
1) "jingxiang"
2) "xiaohong"
3) "panghu"
127.0.0.1:6379> zcard salary #顯示key裏面的元素數量
(integer) 3
127.0.0.1:6379> zcount salary 1000 5000 #顯示key在指定範圍的數量
(integer) 3
127.0.0.1:6379> zcount salary 0 3000
(integer) 2
127.0.0.1:6379>

案例：

set 排序 存儲班級成績表 工資表排序

普通消息 1 重要消息2 帶權重判斷

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