unordered collection of unique strings.
set值是唯一的字符串的無序集合, 把握住兩個特點: 唯一, 無序.
清空所有的數據, 並清理顯示界面:
127.0.0.1:6379> flushall OK 127.0.0.1:6379> clear 保存一條 set 數據, 鍵是 myset1, 值是 1, 2, 3, 4 四個數字:
127.0.0.1:6379> sadd myset1 1 2 3 4 (integer) 4 查看鍵myset1 的值:
127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 在鍵myset1里增加一個已有的數字3, 返回0, 表示添加不成功, 因為 set值是要求唯一的:
127.0.0.1:6379> sadd myset1 3 (integer) 0 127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 在鍵myset1里增加一個新數字5, 返回1, 表示添加成功:
127.0.0.1:6379> sadd myset1 5 (integer) 1 127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 查看鍵myset1的值里一共有幾天數據:
127.0.0.1:6379> scard myset1 (integer) 5 新增一條 set 數據myset2:
127.0.0.1:6379> sadd myset2 5 8 7 6 4 9 (integer) 6 127.0.0.1:6379> smembers myset2 1) "4" 2) "5" 3) "6" 4) "7" 5) "8" 6) "9" 查看兩條 set 數據 myset1 和 myset2 值的區別, myset1 寫在前面, 表示查出所有 myset1 里有, 而 myset2 里沒有的值:
127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 127.0.0.1:6379> sdiff myset1 myset2 1) "1" 2) "2" 3) "3" 查出 myset1 相對於 myset2 里值的差別, 並且保存成一個新 set --- myset3:
127.0.0.1:6379> sdiffstore myset3 myset1 myset2 (integer) 3 127.0.0.1:6379> smembers myset3 1) "1" 2) "2" 3) "3" 合並 myset1 和 myset2 里的所有值, 由於 set值唯一性的特點, 重復的部分只保留一個:
127.0.0.1:6379> sunion myset1 myset2 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "8" 9) "9" 合並 myset1 和 myset2 里的所有值, 並且保存成一個新 set --- myset4:
127.0.0.1:6379> sunionstore myset4 myset1 myset2 (integer) 9 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "8" 9) "9" 指定刪除 set值里的某一個數
127.0.0.1:6379> srem myset4 8 (integer) 1 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "9" 指定刪除 set值里的某幾個數
127.0.0.1:6379> srem myset4 6 7 9 (integer) 3 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 隨機刪除 set值里的某一個數
127.0.0.1:6379> spop myset4 1 1) "5" 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 隨機刪除 set值里的某幾個數
127.0.0.1:6379> spop myset4 3 1) "2" 2) "4" 3) "1" 取兩個 set值的並集:
127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 127.0.0.1:6379> smembers myset2 1) "4" 2) "5" 3) "6" 4) "7" 5) "8" 6) "9" 127.0.0.1:6379> sinter myset1 myset2 1) "4" 2) "5" 取兩個 set值的並集, 並保存:
127.0.0.1:6379> sinterstore myset5 myset1 myset2 (integer) 2 127.0.0.1:6379> smembers myset5 1) "4" 2) "5" 把 myset1 的值里的數字 1 挪到 myset2
127.0.0.1:6379> smove myset1 myset2 1 (integer) 1 127.0.0.1:6379> smembers myset2 1) "1" 2) "4" 3) "5" 4) "6" 5) "7" 6) "8" 7) "9" 127.0.0.1:6379> smembers myset1 1) "2" 2) "3" 3) "4" 4) "5" 以上, 就是關於 set值的一些常用命令, enjoy......