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Home  >  Article  >  Database  >  Example analysis of redis deployment and commands used for various data types

Example analysis of redis deployment and commands used for various data types

WBOY
WBOYforward
2023-05-30 13:09:34658browse

Compile and install redis

Start deployment

[root@mcw01 ~]$ ls
anaconda-ks.cfg  mongodb-linux-x86_64-3.2.8.tgz
[root@mcw01 ~]$ wget http://download.redis.io/releases/redis-4.0.10.tar.gz
--2022-03-05 18:27:02--  http://download.redis.io/releases/redis-4.0.10.tar.gz
Resolving download.redis.io (download.redis.io)... 45.60.125.1
Connecting to download.redis.io (download.redis.io)|45.60.125.1|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1738465 (1.7M) [application/octet-stream]

Saving to: ‘redis-4.0.10.tar.gz'

100%[====================>] 1,738,465   63.4KB/s   in 25s    

2022-03-05 18:27:27 (68.2 KB/s) - ‘redis-4.0.10.tar.gz' saved [1738465/1738465]

anaconda-ks.cfg  mongodb-linux-x86_64-3.2.8.tgz  redis-4.0.10.tar.gz
[root@mcw01 ~]$ tar xf redis-4.0.10.tar.gz 
anaconda-ks.cfg  mongodb-linux-x86_64-3.2.8.tgz  redis-4.0.10  redis-4.0.10.tar.gz
[root@mcw01 ~]$ cd redis-4.0.10/
[root@mcw01 ~/redis-4.0.10]$ ls  #有makefile文件，就不需要./configure配置
00-RELEASENOTES  COPYING  Makefile   redis.conf       runtest-sentinel  tests
BUGS             deps     MANIFESTO  runtest          sentinel.conf     utils
CONTRIBUTING     INSTALL  README.md  runtest-cluster  src
[root@mcw01 ~/redis-4.0.10]$ make

Error report gcc command not found: 

cd hiredis && make static
make[3]: Entering directory `/root/redis-4.0.10/deps/hiredis'
gcc -std=c99 -pedantic -c -O3 -fPIC  -Wall -W -Wstrict-prototypes -Wwrite-strings -g -ggdb  net.c
make[3]: gcc: Command not found
make[3]: *** [net.o] Error 127
make[3]: Leaving directory `/root/redis-4.0.10/deps/hiredis'
make[2]: *** [hiredis] Error 2
make[2]: Leaving directory `/root/redis-4.0.10/deps'
make[1]: [persist-settings] Error 2 (ignored)
    CC adlist.o
/bin/sh: cc: command not found
make[1]: *** [adlist.o] Error 127
make[1]: Leaving directory `/root/redis-4.0.10/src'
make: *** [all] Error 2

#Resolve the dependency environment required for compilation and installation and continue deployment

um install gcc patch libffi-devel python-devel  zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel openssl openssl-devel -y
然后重新执行:
[root@mcw01 ~/redis-4.0.10]$ make  #发现报错没有某个目录或文件。在这之前编译失败了，目录被改变了部分，所以直接删除重新解压，然后make编译
......
Hint: It's a good idea to run 'make test' ;)
make[1]: Leaving directory `/root/redis-4.0.10/src'
[root@mcw01 ~/redis-4.0.10]$ ls
00-RELEASENOTES  COPYING  Makefile   redis.conf       runtest-sentinel  tests
BUGS             deps     MANIFESTO  runtest          sentinel.conf     utils
CONTRIBUTING     INSTALL  README.md  runtest-cluster  src
[root@mcw01 ~/redis-4.0.10]$ make install 
cd src && make install
make[1]: Entering directory `/root/redis-4.0.10/src'
    CC Makefile.dep
    INSTALL install
[root@mcw01 ~/redis-4.0.10]$ 
[root@mcw01 ~/redis-4.0.10]$ redis-c   #当编译好之后，就可以命令补全，也就是已经配置好环境变量了
redis-check-aof  redis-check-rdb  redis-cli        
[root@mcw01 ~/redis-4.0.10]$ which redis-server  #默认编译安装到/usr/local下去了
/usr/local/bin/redis-server
[root@mcw01 ~/redis-4.0.10]$

redis server operation and client connection

[root@mcw01 ~]$ redis-server  #安装好之后，直接运行这个命令
24270:C 05 Mar 18:43:08.857 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
24270:C 05 Mar 18:43:08.857 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=24270, just started
24270:C 05 Mar 18:43:08.857 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
                _._                                                  
           _.-``__ ''-._                                             
      _.-``    `.  `_.  ''-._           Redis 4.0.10 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._                                   
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 24270
  `-._    `-._  `-./  _.-'    _.-'                                   
 |`-._`-._    `-.__.-'    _.-'_.-'|                                  
 |    `-._`-._        _.-'_.-'    |           http://redis.io        
  `-._    `-._`-.__.-'_.-'    _.-'                                   
 |    `-._`-._        _.-'_.-'    |                                  
      `-._    `-.__.-'    _.-'                                       
          `-._        _.-'                                           
              `-.__.-'                                               
24270:M 05 Mar 18:43:08.880 # Server initialized
24270:M 05 Mar 18:43:08.880 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
24270:M 05 Mar 18:43:08.880 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
24270:M 05 Mar 18:43:08.880 * Ready to accept connections
客户端连接：
[root@mcw01 ~]$ redis-cli 127.0.0.1 6379  ^C #我再开一个窗口，默认连接的ip 端口
[root@mcw01 ~]$ redis-cli  #连上之后，ping命令，返回pong,说明连接成功的
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

redis configuration

[root@mcw01 ~]$ ln -s redis-4.0.10  redis 
[root@mcw01 ~]$ ls
anaconda-ks.cfg  dump.rdb  mongodb-linux-x86_64-3.2.8.tgz  redis  redis-4.0.10  redis-4.0.10.tar.gz
[root@mcw01 ~]$ ls redis
00-RELEASENOTES  COPYING  Makefile   redis.conf       runtest-sentinel  tests
BUGS             deps     MANIFESTO  runtest          sentinel.conf     utils
CONTRIBUTING     INSTALL  README.md  runtest-cluster  src
[root@mcw01 ~]$ cd redis
[root@mcw01 ~/redis]$ egrep -v "^#|^$" redis.conf >mcwRedis.conf
[root@mcw01 ~/redis]$ cat mcwRedis.conf 
bind 127.0.0.1   
protected-mode yes  #保护模式开启，并且绑定ip是本机，应该是不支持远程访问，只支持本机访问。
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /var/run/redis_6379.pid
loglevel notice
logfile ""
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir ./
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
slave-lazy-flush no
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
aof-use-rdb-preamble no
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
[root@mcw01 ~/redis]$

redis simple configuration and startup

[root@mcw01 ~/redis]$ cat mcwRedis.conf 
bind 10.0.0.11
protected-mode yes
port 6379
requirepass mcw123 #配置认证密码
daemonize yes #后台守护进程的方式开启
pidfile /var/run/redis_6379.pid
loglevel notice
logfile ""
[root@mcw01 ~/redis]$ 
[root@mcw01 ~/redis]$ ls  
00-RELEASENOTES  COPYING  Makefile       README.md   runtest-cluster   src
BUGS             deps     MANIFESTO      redis.conf  runtest-sentinel  tests
CONTRIBUTING     INSTALL  mcwRedis.conf  runtest     sentinel.conf     utils
[root@mcw01 ~/redis]$ redis-server mcwRedis.conf  #指定配置文件启动。这应该是后面有注释导致的吧，去掉注释
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file, at line 4
>>> 'requirepass mcw123 #配置认证密码'
Bad directive or wrong number of arguments
去掉注释,然后成功启动，这里不能在配置后面加注释，容易出错
[root@mcw01 ~/redis]$ vim mcwRedis.conf 
requirepass mcw123
daemonize yes
[root@mcw01 ~/redis]$ redis-server mcwRedis.conf 
24391:C 05 Mar 19:10:38.749 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
24391:C 05 Mar 19:10:38.749 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=24391, just started
24391:C 05 Mar 19:10:38.749 # Configuration loaded
[root@mcw01 ~/redis]$ netstat -lntup|grep redis #成功启动了
tcp        0      0 10.0.0.11:6379          0.0.0.0:*               LISTEN      24392/redis-server  
[root@mcw01 ~/redis]$ redis-cli  #现在直接这么连接就不行了
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected> 
[root@mcw01 ~/redis]$ redis-cli  -h 10.0.0.11 -p 6379   #指定ip端口连接
10.0.0.11:6379> ping
(error) NOAUTH Authentication required.
10.0.0.11:6379> auth mcw123
OK
10.0.0.11:6379> ping  #认证之后就可以正常执行命令了
PONG
10.0.0.11:6379>

set and get commands

10.0.0.11:6379> set name mcw
OK
10.0.0.11:6379> get name
"mcw"
10.0.0.11:6379> set age  18  
OK
10.0.0.11:6379> get age  #它将值改为字符串类型的了
"18"
10.0.0.11:6379>

simple Configuration file introduction

bind 192.168.182.130  #绑定服务端地址 
protected-mode yes    #安全模式 
port 6800        #端口 
requirepass  haohaio                #密码                                                                       
daemonize yes    #后台运行 
pidfile /var/run/redis_6379.pid    #进程id文件
loglevel notice        #日志等级
logfile ""

redis basic data type

redis is an advanced key:value storage system, in which value supports five data types
Strings
Hashes
Lists
Sets
Sorted sets

redis command

redis simple command

keys * View all keys
type key View key type
expire key seconds Expiration time
ttl key View the remaining time of key expiration - 2 means the key no longer exists
persist Cancel the expiration time of the key -1 indicates that the key exists and has no expiration time

exists key returns 1 to determine whether the key exists, otherwise 0
del keys Delete key You can delete multiple
dbsize Calculate the number of keys
flushdb #Clear All keys in redis, use with caution
flushdb #Clear all keys in redis, use with caution
flushdb #Clear all keys in redis, use with caution

keys * 
10.0.0.11:6379> keys *
1) "age"
2) "name"
10.0.0.11:6379> set gender man
OK
1) "gender"
2) "age"
3) "name"
10.0.0.11:6379> 
keys *         查看所有key
type key      查看key类型
添加一个列表，查看key类型，是列表类型
10.0.0.11:6379> type name
string
10.0.0.11:6379> LPUSH paidui1 xiaoma mcw
(integer) 2
10.0.0.11:6379> keys * 
1) "paidui1"
2) "gender"
3) "age"
4) "name"
10.0.0.11:6379> type paidui1
list
expire key seconds    过期时间
ttl key     查看key过期剩余时间        -2表示key已经不存在了
给已有的paidui1设置一个过期时间多少秒，然后ttl  key可以查看过期时间，当-2时就已经过期了，过期了就已经被移除了
10.0.0.11:6379> EXPIRE paidui1 10
(integer) 1
10.0.0.11:6379> ttl paidui1
(integer) -2
persist     取消key的过期时间   -1表示key存在，没有过期时间
比如下面，将name设置50秒过期，当要取消name的过期时间，执行命令后，ttl值变成-1，就不会出现过期删除的情况了
10.0.0.11:6379> EXPIRE name 50
10.0.0.11:6379> ttl name
(integer) 22
(integer) 19
10.0.0.11:6379> PERSIST name
(integer) -1
exists key     判断key存在    存在返回1    否则0
10.0.0.11:6379> exists name
10.0.0.11:6379> exists mcw
(integer) 0
del keys     删除key    可以删除多个
4) "myname"
10.0.0.11:6379> del myname
dbsize         计算key的数量
10.0.0.11:6379> dbsize
(integer) 3
flushdb  #清除redis所有key,慎用
10.0.0.11:6379> flushdb
(empty list or set)
10.0.0.11:6379>

String type command

redis数据类型1,字符串类型,通过set命令,设置字符串类型的key
    strings类型
    set 　　设置key
    get   获取key
    append  追加string
    mset   设置多个键值对
    mget   获取多个键值对
    del  删除key
    incr  递增+1
    decr  递减-1
set 　　设置key
get   获取key
append  追加string
10.0.0.11:6379> set "name" "mcw"
OK
10.0.0.11:6379> get name
"mcw"
10.0.0.11:6379> append "name" "Haoren"
(integer) 9
10.0.0.11:6379> get name
"mcwHaoren"
10.0.0.11:6379> 
mset   设置多个键值对
mget   获取多个键值对
10.0.0.11:6379> mset name2 "xiaoma" "name3" xiaohong
OK
10.0.0.11:6379> keys *
1) "name2"
2) "name"
3) "name3"
10.0.0.11:6379> get name2
"xiaoma"
10.0.0.11:6379> get name3
"xiaohong"
10.0.0.11:6379> 
10.0.0.11:6379> mget name name2 name3
1) "mcwHaoren"
2) "xiaoma"
3) "xiaohong"
10.0.0.11:6379> 
del  删除key
10.0.0.11:6379> keys *
1) "name2"
2) "name"
3) "name3"
10.0.0.11:6379> del name
(integer) 1
10.0.0.11:6379> del name2 name3
(integer) 2
10.0.0.11:6379> keys *
(empty list or set)
10.0.0.11:6379> 
incr  递增+1
decr  递减-1
相当于把字符串转换为数字，计算后结果再改成字符串。
还可以减为负值
10.0.0.11:6379> keys *
(empty list or set)
10.0.0.11:6379> set "dian zan" 0
OK
10.0.0.11:6379> get "dian zan"
"0"
10.0.0.11:6379> incr "dian zan"
(integer) 1
10.0.0.11:6379> incr "dian zan"
(integer) 2
10.0.0.11:6379> get "dian zan"
"2"
10.0.0.11:6379> incr "dian zan"
(integer) 3
10.0.0.11:6379> get "dian zan"
"3"
10.0.0.11:6379> decr "dian zan"
(integer) 2
10.0.0.11:6379> get "dian zan"
"2"
10.0.0.11:6379> 
10.0.0.11:6379> keys *
1) "dian zan"
10.0.0.11:6379> 
10.0.0.11:6379> get "dian zan"
"2"
10.0.0.11:6379> decr "dian zan"
(integer) 1
10.0.0.11:6379> decr "dian zan"
(integer) 0
10.0.0.11:6379> decr "dian zan"
(integer) -1
10.0.0.11:6379> decr "dian zan"
(integer) -2
10.0.0.11:6379> decr "dian zan"
(integer) -3

list type , Bidirectional queue

lpush Insert from the left side of the list
rpush Insert from the right side of the list
lrange Get elements of a certain length lrange key start stop
ltrim Intercept the list of a certain length
lpop Delete the leftmost An element
rpop deletes the rightmost element
lpushx/rpushx If the key exists, add the value. If it does not exist, it will not be processed. 

lpush         从列表左边插
从左边插入，再从左边获取，先插入的在里面后取出，后插入的在左边先取出
10.0.0.11:6379> keys *
(empty list or set)
10.0.0.11:6379> lpush paidui mcw1 mcw2 mcw3 mcw4
(integer) 4
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw4"
2) "mcw3"
3) "mcw2"
4) "mcw1"
10.0.0.11:6379> lpush paidui mcw5
(integer) 5
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379> 
rpush         从列表右边插
从列表左边取，第一个取出来的是最后推入的，最后一个取出的是第一个推入的。
可以想象成如下排队顺序， mcw5 mcw4 mcw3 mcw2 mcw1   
当从右边推入mcw6的时候就是 :mcw5 mcw4 mcw3 mcw2 mcw1 mcw6
当从左边取数据的时候就是：
第一次取：mcw5
第二次取: mcw4
....
第六次取：mcw6
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379> rpush paidui mcw6
(integer) 6
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
6) "mcw6"
lrange          获取一定长度的元素  lrange key  start stop
取列表类型的数据，指定开始数据和结束数据，比如开始0，结束-1，这是取列表所有的值
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379> 
10.0.0.11:6379> keys * 
1) "paidui"
10.0.0.11:6379> type paidui
list
10.0.0.11:6379> get paidui   #列表类型不能用get取值
(error) WRONGTYPE Operation against a key holding the wrong kind of value
10.0.0.11:6379> lrange paid 0 -1  #不存在的键
(empty list or set)
10.0.0.11:6379> 
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379> 
ltrim               截取一定长度列表
根据查询可知列表数据顺序如下：mcw5 mcw4 mcw3 mcw2 mcw1
索引分别是：                   0    1    2     3    4  
这里是从paidui左边截取，从索引1开始，从索引2结束，其中包含索引2的数据，截取之后，这个key的值就变成截取的值了mcw4 mcw3
然后从左边查询，第一个查出来的数据就是mcw4,第二个就是mcw3
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379> ltrim paidui 1 2
OK
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw4"
2) "mcw3"
10.0.0.11:6379> 
lpop                 删除最左边一个元素
rpop                     删除最右边一个元素
根据lrange可以列表数据的顺序是：mcw5 mcw4 mcw3 mcw2 mcw1 mcw6
所以从左边删除，删的是mcw5,从右边删除，删的是mcw6
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw5"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
6) "mcw6"
10.0.0.11:6379> lpop paidui
"mcw5"
10.0.0.11:6379> rpop paidui
"mcw6"
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw4"
2) "mcw3"
3) "mcw2"
4) "mcw1"
10.0.0.11:6379> 
lpushx/rpushx                key存在则添加值，不存在不处理
不存在返回个0。默认key不存在会创建key的
10.0.0.11:6379> keys * 
1) "paidui"
10.0.0.11:6379> lpushx paid mcw0
(integer) 0
10.0.0.11:6379> keys * 
1) "paidui"
10.0.0.11:6379> lpushx paidui mcw0
(integer) 5
10.0.0.11:6379> keys * 
1) "paidui"
10.0.0.11:6379> lrange paidui 0 -1
1) "mcw0"
2) "mcw4"
3) "mcw3"
4) "mcw2"
5) "mcw1"
10.0.0.11:6379>

redis's collection is an unordered collection. The elements in the collection There is no order of precedence.

There are also many set-related operations, such as adding new elements, deleting existing elements, taking intersections, taking unions, taking differences, etc. Let's look at an example:

sadd/srem Add/delete elements
sismember Determine whether it is an element of the set
smembers Return all members of the set
sdiff Returns the difference between a set and other sets
sinter returns the intersection of several sets
sunion returns the union of several sets 

sadd/srem   添加/删除 元素
smembers    返回集合所有的成员
10.0.0.11:6379> keys *
(empty list or set)
10.0.0.11:6379> sadd zoo gou mao zhu  #添加
(integer) 3
1) "zoo"
10.0.0.11:6379> type zoo
set
10.0.0.11:6379> smembers zoo  #查询
1) "mao"
2) "zhu"
3) "gou"
10.0.0.11:6379> 
10.0.0.11:6379> srem zoo zhu  #删除
(integer) 1
10.0.0.11:6379> smembers zoo
2) "gou"
新增成员
10.0.0.11:6379> sadd zoo zhu #新增
sismember   判断是否为set的一个元素
mao是集合zoo里的成员吗，是，返回的是1；
zhu是集合zoo里的成员吗，不是，返回的是0
10.0.0.11:6379> sismember zoo mao
10.0.0.11:6379> sismember zoo zhu
(integer) 0
sdiff             返回一个集合和其他集合的差异
如下，sdiff 集合1 集合2 
返回集合1中有的，而集合2中没有的。就是取差集
1) "zoo2"
2) "zoo"
10.0.0.11:6379> smembers zoo2
1) "she"
3) "shu"
10.0.0.11:6379> sdiff zoo zoo2
10.0.0.11:6379> sdiff zoo2 zoo
2) "shu"
sinter           返回几个集合的交集
如下，几个集合应该不只是包含两个集合
10.0.0.11:6379> sinter zoo zoo2
1) "zhu"
10.0.0.11:6379> sinter zoo2 zoo
sunion          返回几个集合的并集
集合取并集，几个集合应该不只是能用两个集合
10.0.0.11:6379> sunion zoo zoo2
4) "mao"
5) "shu"
10.0.0.11:6379>

Hash data structure

hashes are hashes. Hash is a data structure only available since redis-2.0.0 version.

Hashes stores the mapping between strings and string values. For example, if a user wants to store his full name, surname, age, etc., it is suitable to use hashes.

hset Set the hash value
hget Get the hash value
hmset Set multiple pairs of hash values ​​
hmget Get multiple pairs of hash values ​​
hsetnx If the hash already exists, then Not set (prevents key overwriting)
hkeys Returns all fields
hvals Returns all values ​​
hlen Returns the number of fields (fields) contained in the hash
hdel Delete the field (field) specified by the hash
hexists Determine whether there is 

hset 设置散列值
hget  获取散列值
10.0.0.11:6379> hset stu1 name "mcw" age 18 height "170"
(integer) 3
10.0.0.11:6379> keys * 
1) "stu1"
10.0.0.11:6379> type stu1
hash
10.0.0.11:6379> hget stu1 name
"mcw"
10.0.0.11:6379> hget stu1 age
"18"
10.0.0.11:6379> hget stu1 height
"170"
10.0.0.11:6379> 
10.0.0.11:6379> hset new1 title "happy new year" content "ni hao"
(integer) 2
10.0.0.11:6379> 
hmset  设置多对散列值
hmget  获取多对散列值
10.0.0.11:6379> 
10.0.0.11:6379> keys * 
1) "stu1"
2) "new1"
10.0.0.11:6379> hmget stu1 name age height
1) "mcw"
2) "18"
3) "170"
10.0.0.11:6379> 
hsetnx   如果散列已经存在，则不设置（防止覆盖key）
10.0.0.11:6379> hsetnx stu2 name "mcw2" age 18 height "168"
(error) ERR wrong number of arguments for 'hsetnx' command
10.0.0.11:6379> 
10.0.0.11:6379> hsetnx stu2 name "mcw2" 
(integer) 1
10.0.0.11:6379> hsetnx stu2 name "mcw2" 
(integer) 0
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> hsetnx stu2 name "mcw1"  
(integer) 0
10.0.0.11:6379> hget stu2 name  #存在stu2，使用hsetnx没被修改
"mcw2"
10.0.0.11:6379> hset stu2 name "mcw1" 
(integer) 0
10.0.0.11:6379> hget stu2 name  #存在stu2，使用hset被修改了
"mcw1"
10.0.0.11:6379> 
hkeys     返回所有fileds
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> hkeys stu1
1) "name"
2) "age"
3) "height"
10.0.0.11:6379> 
hvals     返回所有values
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> hvals stu1
1) "mcw"
2) "18"
3) "170"
10.0.0.11:6379> 
hlen      返回散列包含域（field）的数量
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> hkeys stu1
1) "name"
2) "age"
3) "height"
10.0.0.11:6379> hlen stu1
(integer) 3
10.0.0.11:6379> hkeys new1
1) "title"
2) "content"
10.0.0.11:6379> hlen new1
(integer) 2
10.0.0.11:6379> 
hdel     删除散列指定的域（field）
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> type stu1
hash
10.0.0.11:6379> 
10.0.0.11:6379> hkeys stu1
1) "name"
2) "age"
3) "height"
10.0.0.11:6379> hdel stu1 height  #删除指定字段
(integer) 1
10.0.0.11:6379> hkeys stu1
1) "name"
2) "age"
10.0.0.11:6379> 
hexists    判断是否存在
10.0.0.11:6379> keys *
1) "stu2"
2) "stu1"
3) "new1"
10.0.0.11:6379> type stu1
hash
10.0.0.11:6379> hkeys stu1
1) "name"
2) "age"
10.0.0.11:6379> hexists stu1 name   #存在字段返回1
(integer) 1
10.0.0.11:6379> hexists stu1 height #不存在字段返回0
(integer) 0
10.0.0.11:6379>

Publish and subscribe

Main applications: notifications, announcements
Can be used as a message queue or message pipeline

One publication, multiple subscriptions
Publish: The radio station channel can send sound information to all people who receive this channel
Subscription: Many people can receive the news of this radio station

For example, QQ group announcement: one publish, multiple subscriptions (Received)

As follows, one publisher, two subscribers, Subscriber 1 subscribes to messages related to python and linux channels; Subscriber 2 subscribes to messages related to golang and Linux

Example analysis of redis deployment and commands used for various data types

When the publisher publishes a message, Subscriber 1 receives the message from the subscription channel python

Example analysis of redis deployment and commands used for various data types

When the publisher When the linux channel is published, both subscribers receive the message. The publisher also returns how many subscribers received the message. The above article is written incorrectly and is published to a channel that no one subscribes to, returning 0 subscribers

Example analysis of redis deployment and commands used for various data types

The channel published by the publisher and the channel received, this is required Accurate judgment, cannot fuzzy match the

Example analysis of redis deployment and commands used for various data types

of the received message. When the subscriber uses psubscribe here, it becomes the pattern

Example analysis of redis deployment and commands used for various data types

When a subscriber uses the psubscribe command and the subscribed channel uses a wildcard, then the channel published by the publisher that can be fuzzy matched with the subscriber will be received by the subscriber

Example analysis of redis deployment and commands used for various data types

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