Redis核心数据结构

其他 2021-12-12 03:43:53 阅读次数: 0

五种数据结构

String结构

字符串常用操作

SET  key  value 			//存入字符串键值对
MSET  key  value [key value ...] 	//批量存储字符串键值对
SETNX  key  value 		//存入一个不存在的字符串键值对
GET  key 			//获取一个字符串键值
MGET  key  [key ...]	 	//批量获取字符串键值
DEL  key  [key ...] 		//删除一个键
EXPIRE  key  seconds 		//设置一个键的过期时间(秒)

原子加减

INCR  key 			//将key中储存的数字值加1
DECR  key 			//将key中储存的数字值减1
INCRBY  key  increment 		//将key所储存的值加上increment
DECRBY  key  decrement 	//将key所储存的值减去decrement
127.0.0.1:6379> incr yuanzi
(integer) 1
127.0.0.1:6379> get yuanzi
"1"
127.0.0.1:6379> decr yuanzi
(integer) 0
127.0.0.1:6379> get yuanzi
"0"
127.0.0.1:6379> keys *
1) "yuanzi"
127.0.0.1:6379> set ak 1
OK
127.0.0.1:6379> get ak
"1"
127.0.0.1:6379> incrby ak 5
(integer) 6
127.0.0.1:6379> get ak
"6"
127.0.0.1:6379> decrby ak 2
(integer) 4
127.0.0.1:6379> get ak
"4"
127.0.0.1:6379>

String应用场景

单值缓存

SET  key  value     
GET  key

对象缓存

1) SET  user:1  value(json格式数据)
2) MSET  user:1:name  edsion   user:1:balance  1888
    MGET  user:1:name   user:1:balance

分布式锁

SETNX  product:10001  true         //返回1代表获取锁成功
SETNX  product:10001  true         //返回0代表获取锁失败
。。。执行业务操作
DEL  product:10001            //执行完业务释放锁

SET product:10001 true  ex  10  nx    //防止程序意外终止导致死锁

计数器

INCR article:readcount:{文章id}      
GET article:readcount:{文章id}

阅读量

 Web集群session共享

spring session + redis实现session共享

分布式系统全局序列号

INCRBY  orderId  1000        //redis批量生成序列号提升性能

Hash结构

Hash常用操作

HSET  key  field  value 			//存储一个哈希表key的键值
HSETNX  key  field  value 		//存储一个不存在的哈希表key的键值
HMSET  key  field  value [field value ...] 	//在一个哈希表key中存储多个键值对
HGET  key  field 				//获取哈希表key对应的field键值
HMGET  key  field  [field ...] 		//批量获取哈希表key中多个field键值
HDEL  key  field  [field ...] 		//删除哈希表key中的field键值
HLEN  key				//返回哈希表key中field的数量
HGETALL  key				//返回哈希表key中所有的键值

HINCRBY  key  field  increment 		//为哈希表key中field键的值加上增量increment

127.0.0.1:6379> hset key field value
(integer) 1
127.0.0.1:6379> hget key field
"value"
127.0.0.1:6379> del key
(integer) 1
127.0.0.1:6379> hget key field
(nil)
127.0.0.1:6379> hset usermap name1 dalang name2 menqing name3 jinlian 
(integer) 3
127.0.0.1:6379> hget usermap
(error) ERR wrong number of arguments for 'hget' command
127.0.0.1:6379> hlen usermap
(integer) 3
127.0.0.1:6379> hgetall username
(empty list or set)
127.0.0.1:6379> hgetall usermap
1) "name1"
2) "dalang"
3) "name2"
4) "menqing"
5) "name3"
6) "jinlian"
127.0.0.1:6379> hget usermap name1
"dalang"
127.0.0.1:6379> hsetnx agemap user1 18 user2 20 user3 32
(error) ERR wrong number of arguments for 'hsetnx' command
127.0.0.1:6379> hsetnx age 18
(error) ERR wrong number of arguments for 'hsetnx' command
127.0.0.1:6379> hsetnx agemap user 18
(integer) 1
127.0.0.1:6379> hmset sex dalang n menqing n jinlian v
OK
127.0.0.1:6379> hsetnx agemap user 18
(integer) 0
127.0.0.1:6379> hget agemap
(error) ERR wrong number of arguments for 'hget' command
127.0.0.1:6379> hget agemap user
"18"
127.0.0.1:6379> hmget usermap
(error) ERR wrong number of arguments for 'hmget' command
127.0.0.1:6379> hmget usermap name1 name2 name3
1) "dalang"
2) "menqing"
3) "jinlian"
127.0.0.1:6379> hgetall usermap
1) "name1"
2) "dalang"
3) "name2"
4) "menqing"
5) "name3"
6) "jinlian"
127.0.0.1:6379> hgetall agemap
1) "user"
2) "18"
127.0.0.1:6379> hgetall sex
1) "dalang"
2) "n"
3) "menqing"
4) "n"
5) "jinlian"
6) "v"
127.0.0.1:6379> hincrby agemap user 5
(integer) 23
127.0.0.1:6379> hget agemap user
"23"
127.0.0.1:6379>

Hash结构优点

优点
1）同类数据归类整合储存，方便数据管理
2）相比string操作消耗内存与cpu更小
3）相比string储存更节省空间

缺点
过期功能不能使用在field上，只能用在key上
Redis集群架构下不适合大规模使用

Redis集群架构

Hash应用场景

对象缓存

HMSET  user  {userId}:name  zhuge  {userId}:balance  1888
HMSET  user  1:name  edsion  1:balance  1888
HMGET  user  1:name  1:balance 

127.0.0.1:6379> hmset user 1:name dalang 1:age 20 1:money 0 2:name menqing 2:age 18 2:money 100
OK
127.0.0.1:6379> hmget user
(error) ERR wrong number of arguments for 'hmget' command
127.0.0.1:6379> hmget user 1:name 1:age 1:money
1) "dalang"
2) "20"
3) "0"

电商购物车

1）以用户id为key
2）商品id为field
3）商品数量为value

购物车操作

添加商品hset cart:1001 10088 1
增加数量hincrby cart:1001 10088 1
商品总数hlen cart:1001
删除商品hdel cart:1001 10088
获取购物车所有商品hgetall cart:1001

List结构

List常用操作

LPUSH  key  value [value ...] 		//将一个或多个值value插入到key列表的表头(最左边)
RPUSH  key  value [value ...]	 	//将一个或多个值value插入到key列表的表尾(最右边)
LPOP  key			//移除并返回key列表的头元素
RPOP  key			//移除并返回key列表的尾元素
LRANGE  key  start  stop		//返回列表key中指定区间内的元素，区间以偏移量start和stop指定

BLPOP  key  [key ...]  timeout	//从key列表表头弹出一个元素，若列表中没有元素，阻塞等待					timeout秒,如果timeout=0,一直阻塞等待
BRPOP  key  [key ...]  timeout 	//从key列表表尾弹出一个元素，若列表中没有元素，阻塞等待					timeout秒,如果timeout=0,一直阻塞等待

127.0.0.1:6379> Lpush namelist 1 2 3 4 5 6 7 8 9
(integer) 9
127.0.0.1:6379> get namelist
(error) WRONGTYPE Operation against a key holding the wrong kind of value
127.0.0.1:6379> getlist namelist
(error) ERR unknown command `getlist`, with args beginning with: `namelist`, 
127.0.0.1:6379> -h
(error) ERR unknown command `-h`, with args beginning with: 
127.0.0.1:6379> lget namelist
(error) ERR unknown command `lget`, with args beginning with: `namelist`, 
127.0.0.1:6379> lget namelist 1
(error) ERR unknown command `lget`, with args beginning with: `namelist`, `1`, 
127.0.0.1:6379> langet namelist
(error) ERR unknown command `langet`, with args beginning with: `namelist`, 
127.0.0.1:6379> langet namelist stat stop
(error) ERR unknown command `langet`, with args beginning with: `namelist`, `stat`, `stop`, 
127.0.0.1:6379> langet namelist start stop
(error) ERR unknown command `langet`, with args beginning with: `namelist`, `start`, `stop`, 
127.0.0.1:6379> lrange namelist start stop
(error) ERR value is not an integer or out of range
127.0.0.1:6379> lrange namelist 0 9
1) "9"
2) "8"
3) "7"
4) "6"
5) "5"
6) "4"
7) "3"
8) "2"
9) "1"
127.0.0.1:6379> lrange namelist 0 -1
1) "9"
2) "8"
3) "7"
4) "6"
5) "5"
6) "4"
7) "3"
8) "2"
9) "1"
127.0.0.1:6379> lpush namelist daliang menqing
(integer) 11
127.0.0.1:6379> lrange namelist 0 -1
 1) "menqing"
 2) "daliang"
 3) "9"
 4) "8"
 5) "7"
 6) "6"
 7) "5"
 8) "4"
 9) "3"
10) "2"
11) "1"
127.0.0.1:6379> rpush jinlian xiaoping
(integer) 1
127.0.0.1:6379> rpush namelist jinlian xiaoping
(integer) 13
127.0.0.1:6379> lrange namelist 0 -1
 1) "menqing"
 2) "daliang"
 3) "9"
 4) "8"
 5) "7"
 6) "6"
 7) "5"
 8) "4"
 9) "3"
10) "2"
11) "1"
12) "jinlian"
13) "xiaoping"
127.0.0.1:6379> lpop namelist
"menqing"
127.0.0.1:6379> lrange namelist 0 -1
 1) "daliang"
 2) "9"
 3) "8"
 4) "7"
 5) "6"
 6) "5"
 7) "4"
 8) "3"
 9) "2"
10) "1"
11) "jinlian"
12) "xiaoping"
127.0.0.1:6379> rpop namelist
"xiaoping"
127.0.0.1:6379> lrange namelist 0 -1
 1) "daliang"
 2) "9"
 3) "8"
 4) "7"
 5) "6"
 6) "5"
 7) "4"
 8) "3"
 9) "2"
10) "1"
11) "jinlian"
127.0.0.1:6379> blpop namelist 2
1) "namelist"
2) "daliang"
127.0.0.1:6379> rpush numlist 1 2 3 4 5
(integer) 5
127.0.0.1:6379> lrange numlist 0 -1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> blpop namelist 2 numlist 1
1) "namelist"
2) "9"
127.0.0.1:6379> blpop namelist numlist
(error) ERR timeout is not an integer or out of range
127.0.0.1:6379> blpop namelist numlist 2
1) "namelist"
2) "8"
127.0.0.1:6379> blpop namelist numlist 4
1) "namelist"
2) "7"
127.0.0.1:6379> blpop namelist 1
1) "namelist"
2) "6"
127.0.0.1:6379> blpop namelist 2
1) "namelist"
2) "5"
127.0.0.1:6379> blpop namelist
(error) ERR wrong number of arguments for 'blpop' command
127.0.0.1:6379> blpop namelist 2
1) "namelist"
2) "4"
127.0.0.1:6379> lrange namelist 0 -1
1) "3"
2) "2"
3) "1"
4) "jinlian"
127.0.0.1:6379> lrange numlist 0 -1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> brpop numlist 1
1) "numlist"
2) "5"
127.0.0.1:6379> brpop numlist namelist
(error) ERR timeout is not an integer or out of range
127.0.0.1:6379> brpop numlist namelist 1
1) "numlist"
2) "4"
127.0.0.1:6379> lrange numlist 0 -1
1) "1"
2) "2"
3) "3"
127.0.0.1:6379> lrange namelist 0 -1
1) "3"
2) "2"
3) "1"
4) "jinlian"

List应用场景

常用数据结构

Stack(栈) = LPUSH + LPOP
Queue(队列）= LPUSH + RPOP
Blocking MQ(阻塞队列）= LPUSH + BRPOP

微博和微信公号消息流

edsion关注了MacTalk，备胎说车等大V
1）MacTalk发微博，消息ID为10018
LPUSH  msg:{edsion-ID}  10018
2）备胎说车发微博，消息ID为10086
LPUSH  msg:{edsion-ID} 10086
3）查看最新微博消息
LRANGE  msg:{edsion-ID}  0  4

Set结构

Set常用操作

SADD  key  member  [member ...]			//往集合key中存入元素，元素存在则忽略，
							若key不存在则新建
SREM  key  member  [member ...]			//从集合key中删除元素
SMEMBERS  key					//获取集合key中所有元素
SCARD  key					//获取集合key的元素个数
SISMEMBER  key  member			//判断member元素是否存在于集合key中
SRANDMEMBER  key  [count]			//从集合key中选出count个元素，元素不从key中删除
SPOP  key  [count]				//从集合key中选出count个元素，元素从key中删除

Set运算操作

 destination是新set的名字，也可以叫aomao、agou

SINTER  key  [key ...] 				//交集运算
SINTERSTORE  destination  key  [key ..]		//将交集结果存入新集合destination中
SUNION  key  [key ..] 				//并集运算
SUNIONSTORE  destination  key  [key ...]		//将并集结果存入新集合destination中
SDIFF  key  [key ...] 				//差集运算
SDIFFSTORE  destination  key  [key ...]		//将差集结果存入新集合destination中
127.0.0.1:6379> sadd testset 1 2 3 4 5
(integer) 5
127.0.0.1:6379> smembers testset
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> scard testset
(integer) 5
127.0.0.1:6379> srem testset 6
(integer) 0
127.0.0.1:6379> srem testset 5
(integer) 1
127.0.0.1:6379> smembers testset
1) "1"
2) "2"
3) "3"
4) "4"
127.0.0.1:6379> srandmember testset 3
1) "2"
2) "4"
3) "1"
127.0.0.1:6379> smembers testset
1) "1"
2) "2"
3) "3"
4) "4"
127.0.0.1:6379> spop testset 2
1) "4"
2) "1"
127.0.0.1:6379> smembers testset
1) "2"
2) "3"
127.0.0.1:6379> sadd set1 1 2 3 4 5
(integer) 5
127.0.0.1:6379> sadd set2 4 5 6 7 8
(integer) 5
127.0.0.1:6379> sadd set3 7 8 9 0 a
(integer) 5
127.0.0.1:6379> sinter set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sinter set1 set2
1) "4"
2) "5"
127.0.0.1:6379> sinter set1 set2 set 3
(empty list or set)
127.0.0.1:6379> sinterstore destination set1 set2
(integer) 2
127.0.0.1:6379> sinter destination
1) "4"
2) "5"
127.0.0.1:6379> sinterstore destination set2 set3
(integer) 2
127.0.0.1:6379> sinter destination
1) "7"
2) "8"
127.0.0.1:6379> sinterstore destination set1 set3
(integer) 0
127.0.0.1:6379> sinter destination
(empty list or set)
127.0.0.1:6379> sinterstore destination set1 set2 jiaoji
(integer) 0
127.0.0.1:6379> sinter jiaoji
(empty list or set)
127.0.0.1:6379> sinter jiaoji2
(empty list or set)
127.0.0.1:6379> sunion set1 set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
7) "7"
8) "8"
127.0.0.1:6379> sunionstore set1 set2
(integer) 5
127.0.0.1:6379> sinter destination
(empty list or set)
127.0.0.1:6379> sinter set1
1) "4"
2) "5"
3) "6"
4) "7"
5) "8"
127.0.0.1:6379> sinter set2
1) "4"
2) "5"
3) "6"
4) "7"
5) "8"
127.0.0.1:6379> sunionstore destination set1 set2
(integer) 5
127.0.0.1:6379> sinter destination
1) "4"
2) "5"
3) "6"
4) "7"
5) "8"
127.0.0.1:6379> sunionstore set1 set3
(integer) 5
127.0.0.1:6379> sinter set1
1) "a"
2) "9"
3) "8"
4) "7"
5) "0"
127.0.0.1:6379> spop set1 5
1) "a"
2) "8"
3) "9"
4) "7"
5) "0"
127.0.0.1:6379> sinter set1
(empty list or set)
127.0.0.1:6379> sadd set1 1 2 3 4 5
(integer) 5
127.0.0.1:6379> sinter set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sdiff set1 set2
1) "1"
2) "2"
3) "3"
127.0.0.1:6379> sdiffstore destination  set1 set2
(integer) 3
127.0.0.1:6379> sinter destination
1) "1"
2) "2"
3) "3"

 

Set应用场景

微信抽奖小程序

1）点击参与抽奖加入集合
SADD key {userlD}
2）查看参与抽奖所有用户
SMEMBERS key      
3）抽取count名中奖者
SRANDMEMBER key [count] / SPOP key [count]

微信微博点赞，收藏，标签

1) 点赞
SADD  like:{消息ID}  {用户ID}
2) 取消点赞
SREM like:{消息ID}  {用户ID}
3) 检查用户是否点过赞
SISMEMBER  like:{消息ID}  {用户ID}
4) 获取点赞的用户列表
SMEMBERS like:{消息ID}
5) 获取点赞用户数
SCARD like:{消息ID}

集合操作

SINTER set1 set2 set3  { c }
SUNION set1 set2 set3  { a,b,c,d,e }
SDIFF set1 set2 set3  { a }

集合操作实现微博微信关注模型

1) edsion关注的人:
edsionSet-> {timedashi,wuyanzu}
2) 谢霆锋关注的人:
 xieSet--> {edsion, jinchengwu, timedashi, lvxiaobu}
3) 时间管理大师关注的人:
timedashiSet-> {edsion,xie,jinchengwu, xushu, lvxiaobu)
4) edsion和谢霆锋共同关注:
SINTER edsionSet xieSet--> {timedashi,lvxiaobu}
5) 我关注的人也关注他(谢霆锋):
SISMEMBER timedashiSet xie
SISMEMBER lvxiaobuSet xie
6) 我可能认识的人:
SDIFF xieSet edsionSet->(edsion, jinchengwu}

Set应用场景

集合操作实现电商商品筛选

SADD  brand:huawei  P40
SADD  brand:xiaomi  mi-10
SADD  brand:iPhone iphone12
SADD os:android  P40  mi-10
SADD cpu:brand:intel  P40  mi-10
SADD ram:8G  P40  mi-10  iphone12

SINTER  os:android  cpu:brand:intel  ram:8G   {P40，mi-10}

ZSet有序集合结构结构

ZSet常用操作

ZADD key score member [[score member]…]	//往有序集合key中加入带分值元素
ZREM key member [member …]		//从有序集合key中删除元素
ZSCORE key member 			//返回有序集合key中元素member的分值
ZINCRBY key increment member		//为有序集合key中元素member的分值加上increment 
ZCARD key				//返回有序集合key中元素个数
ZRANGE key start stop [WITHSCORES]	//正序获取有序集合key从start下标到stop下标的元素
ZREVRANGE key start stop [WITHSCORES]	//倒序获取有序集合key从start下标到stop下标的元素

Zset集合操作

ZUNIONSTORE destkey numkeys key [key ...] 	//并集计算，会把相同member的score加一起
ZINTERSTORE destkey numkeys key [key …]	//交集计算，会把相同member的score加一起

127.0.0.1:6379> zadd zset1 1 2 3 4 5
(error) ERR syntax error
127.0.0.1:6379> zadd zset1  score 1 2 3 4 5
(error) ERR value is not a valid float
127.0.0.1:6379> zadd zset1 score 1 2 3 4 5
(error) ERR value is not a valid float
127.0.0.1:6379> zadd zset1 s 1 s 2
(error) ERR value is not a valid float
127.0.0.1:6379> zadd zset1 s 1 s2 2
(error) ERR value is not a valid float
127.0.0.1:6379> zadd keyazet score member
(error) ERR value is not a valid float
127.0.0.1:6379> zadd k1 60 v1
(integer) 1
127.0.0.1:6379> zadd k1 60 60
(integer) 1
127.0.0.1:6379> zadd zetset1 1 a 2 b 3 c
(integer) 3
127.0.0.1:6379> zscore zetset1 a
"1"
127.0.0.1:6379> zscore zetset1 a b c
(error) ERR wrong number of arguments for 'zscore' command
127.0.0.1:6379> zincrby zetset1 increment 2
(error) ERR value is not a valid float
127.0.0.1:6379> zincrby zetset1 increment a
(error) ERR value is not a valid float
127.0.0.1:6379> zincrby zetset1 5 a
"6"
127.0.0.1:6379> zscore zetset1 a
"6"
127.0.0.1:6379> zcard zetset1
(integer) 3
127.0.0.1:6379> zrange zetset 0 -1
(empty list or set)
127.0.0.1:6379> zrange zetset1 0 -1
1) "b"
2) "c"
3) "a"
127.0.0.1:6379> zrevrange zetset1 0 -1
1) "a"
2) "c"
3) "b"
127.0.0.1:6379> zscore zetset1
(error) ERR wrong number of arguments for 'zscore' command
127.0.0.1:6379> zrem zetset1 a
(integer) 1
127.0.0.1:6379> zscore zetset1
(error) ERR wrong number of arguments for 'zscore' command
127.0.0.1:6379> zscore zetset1
(error) ERR wrong number of arguments for 'zscore' command
127.0.0.1:6379> zscore zetset1
(error) ERR wrong number of arguments for 'zscore' command
127.0.0.1:6379> zrevrange zetset1 0 -1
1) "c"
2) "b"
127.0.0.1:6379> zadd zset1 1 a 2 b 3 c
(integer) 3
127.0.0.1:6379> zadd zset2 3 c 3 d 4 e 5 f 5 g
(integer) 5
127.0.0.1:6379> zunionstore destkey numkeys zset1 zset2
(error) ERR value is not an integer or out of range
127.0.0.1:6379> ZUNIONSTORE destkey numkeys zset1 zset2
(error) ERR value is not an integer or out of range
127.0.0.1:6379> ZUNIONSTORE a 3 zset1 zset2
(error) ERR syntax error
127.0.0.1:6379> ZUNIONSTORE destkey 2 zset1 zset2
(integer) 7
127.0.0.1:6379> zrange destkey 0 -1
1) "a"
2) "b"
3) "d"
4) "e"
5) "f"
6) "g"
7) "c"
127.0.0.1:6379> zscore destkey c
"6"
127.0.0.1:6379> zinterstore destkey2 2 zset1 zset2
(integer) 1
127.0.0.1:6379> zscore destkey2 c
"6"
127.0.0.1:6379> zrange destkey2 0 -1
1) "c"
127.0.0.1:6379>

ZSet有序集合结构应用场景

Zset集合操作实现排行榜

1）点击新闻
ZINCRBY  hotNews:20190819  1  守护香港
2）展示当日排行前十
ZREVRANGE  hotNews:20190819  0  9  WITHSCORES
3）七日搜索榜单计算
ZUNIONSTORE  hotNews:20190813-20190819  7
hotNews:20190813  hotNews:20190814... hotNews:20190819
4）展示七日排行前十
ZREVRANGE hotNews:20190813-20190819  0  9  WITHSCORES

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