Redis基礎學習（3）

五大資料型別之三

Set（集合）

set中的值不能重讀

添加和判斷

127.0.0.1:6379> sadd set "hello"    #set里添加
(integer) 1
127.0.0.1:6379> sadd set "111222"
(integer) 1
127.0.0.1:6379> sadd set "222333"
(integer) 1
127.0.0.1:6379> SMEMBERS set      #查看
1) "222333"
2) "111222"
3) "hello"
127.0.0.1:6379> SISMEMBER set hello    #判斷是否存在
(integer) 1
127.0.0.1:6379> SISMEMBER set re
(integer) 0

移除

127.0.0.1:6379> scard set        #查看集合中的個數
(integer) 3
127.0.0.1:6379> srem set 111222   #移除集合中的指定元素
(integer) 1
127.0.0.1:6379> scard set
(integer) 2
127.0.0.1:6379> SMEMBERS set
1) "222333"
2) "hello"

隨機抽取資料

127.0.0.1:6379> SMEMBERS set
1) "222333"
2) "hello"
127.0.0.1:6379> SRANDMEMBER set    #隨機抽取一個
"222333"
127.0.0.1:6379> SRANDMEMBER set
"222333"
127.0.0.1:6379> SRANDMEMBER set
"hello"
127.0.0.1:6379> SRANDMEMBER set 2   #隨機抽取指定個數的元素
1) "222333"
2) "hello"

隨機彈出資料

127.0.0.1:6379> SMEMBERS set
1) "333444"
2) "222333"
3) "hello"
127.0.0.1:6379> spop set     #隨機洗掉set集合中的元素
"222333"
127.0.0.1:6379> SMEMBERS set  
1) "333444"
2) "hello"

移動指定的元素到另一個集合中

127.0.0.1:6379> sadd set "hello"
(integer) 1
127.0.0.1:6379> sadd set "fdfdfd"
(integer) 1
127.0.0.1:6379> sadd set "fdjkfd"
(integer) 1
127.0.0.1:6379> sadd sad "ejrek"
(integer) 1
127.0.0.1:6379> smove set sad "hello"
(integer) 1
127.0.0.1:6379> SMEMBERS set 
1) "fdjkfd"
2) "fdfdfd"
127.0.0.1:6379> SMEMBERS sad
1) "ejrek"
2) "hello"

差集，交集，并集

- 差集 sdiff

- 交集 sinter

- 并集 sunion

127.0.0.1:6379> sadd key 11
(integer) 1
127.0.0.1:6379> sadd key 22
(integer) 1
127.0.0.1:6379> sadd key 33
(integer) 1
127.0.0.1:6379> sadd key 44
(integer) 1
127.0.0.1:6379> sadd key1 55
(integer) 1
127.0.0.1:6379> sadd key1 66
(integer) 1
127.0.0.1:6379> sadd key1 77
(integer) 1
127.0.0.1:6379> sadd key1 11
(integer) 1
127.0.0.1:6379> sdiff key key1         #差集
1) "22"
2) "33"
3) "44"
127.0.0.1:6379> sinter key key1        #交集
1) "11"
127.0.0.1:6379> sunion key key1        #并集
1) "11"
2) "22"
3) "33"
4) "44"
5) "55"
6) "66"
7) "77"

Hash

創建和查看

Map集合，key-value，key-map map集合,和string型別沒有區別，

格式：set hash field “111”

127.0.0.1:6379> hset hash field cccc   #設定一個值
(integer) 1
127.0.0.1:6379> hget hash field       #獲取一個值
"cccc"
127.0.0.1:6379> hmset hash field hello field2 world  #設定多個值
OK
127.0.0.1:6379> hmget hash field field2     #獲取多個值
1) "hello"
2) "world"
127.0.0.1:6379> hgetall hash          #獲取全部的值
1) "field"
2) "hello"
3) "field2"
4) "world"

洗掉

127.0.0.1:6379> hdel hash field   #洗掉hash指定的值
(integer) 1
127.0.0.1:6379> hgetall hash   #對應的值也沒有了
1) "field2"
2) "world"

獲取

127.0.0.1:6379> HGETALL hash   
1) "field2"
2) "world"
3) "field"
4) "hello"
127.0.0.1:6379> hlen hash   #獲取hash里的字符數量
(integer) 2
127.0.0.1:6379> hkeys hash   #只獲取field這個欄位的值
1) "field2"
2) "field"
127.0.0.1:6379> hvals hash    #只獲取hash里的值
1) "world"
2) "hello"

判斷

127.0.0.1:6379> hexists hash field1
(integer) 0
127.0.0.1:6379> HEXISTS hash field   #判斷指定的欄位是否存在
(integer) 1

127.0.0.1:6379> hset hash field3 555    
(integer) 1
127.0.0.1:6379> hincrby hash field3 1   #增量
(integer) 556
127.0.0.1:6379> hincrby hash field3 -1   #減量
(integer) 555
127.0.0.1:6379> hsetnx hash field4 hello  #如果不存在就設定
(integer) 1
127.0.0.1:6379> hsetnx hash field4 world  #如果存在就不設定
(integer) 0

hash可以做用戶資訊之類的保存，或者經常變動的資訊就用hash做存盤，hash更適合物件存盤，string適合字串的存盤，