Redis是Key-Value数据库，Key都是字符串且区分大小写，关于Redis的key操作，主要有常见的以下几个
Redis的命令是不区分大小写的
keys *查看当前库所有的Key，类似于数据库的select * from tb_xxx
127.0.0.1:6379> keys *
1) "k1"
2) "k2"
exists <key]>Key是否存在，返回bool，1代表true，0代表false
127.0.0.1:6379> exists k1
(integer) 1
127.0.0.1:6379> exists k2
(integer) 1
127.0.0.1:6379> exists k3
(integer) 0
Redis的底层使用C语言实现，很多命令返回bool时，多用0和1表示
type <key>key对应的value是什么类型
127.0.0.1:6379> type k1
stringdel <key>删除数据，返回bool
127.0.0.1:6379> del k2
(integer) 1unlink <key>非阻塞删除，仅仅将key从keyspace元数据中删除，真正的数据删除将在后续异步进行，返回bool
127.0.0.1:6379> unlink k1
(integer) 1ttl <key>查看key还有多少秒过期，-1代表永不过期，-2代表已过期，通常和expire命令搭配使用
127.0.0.1:6379> ttl k1
(integer) -1expire <key> <秒数>为指定的key设置过期时间
127.0.0.1:6379> expire k1 100
(integer) 1
127.0.0.1:6379> ttl k1
(integer) 90
127.0.0.1:6379> ttl k1
(integer) 86
move <key> <index>将当前key移动到指定的数据库中，返回bool
127.0.0.1:6379> move k1 2
(integer) 1
select <index>选中几号仓库。redis.conf配置文件默认Redis共16个数据库(0-15)，默认选中0号库
127.0.0.1:6379> select 2
OK
127.0.0.1:6379[2]> select 3
OK
127.0.0.1:6379[3]>
dbsize查看当前库有多少key
127.0.0.1:6379[3]> dbsize
(integer) 0
127.0.0.1:6379[3]> set k1 v1
OK
127.0.0.1:6379[3]> dbsize
(integer) 1
127.0.0.1:6379[3]>
flushdb清空当前库中的所有key
127.0.0.1:6379> flushdb
OKflushall清空整个Redis中的所有key
127.0.0.1:6379> flushall
OKhelp @<type>命令行下输入help @<type>命令，redis服务器会返回该数据类型的所有用法
127.0.0.1:6379> help @string
APPEND key value
summary: Appends a string to the value of a key. Creates the key if it doesn't exist.
since: 2.0.0
DECR key
summary: Decrements the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0
DECRBY key decrement
summary: Decrements a number from the integer value of a key. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0
GET key
summary: Returns the string value of a key.
since: 1.0.0
GETDEL key
summary: Returns the string value of a key after deleting the key.
since: 6.2.0
GETEX key [EX seconds|PX milliseconds|EXAT unix-time-seconds|PXAT unix-time-milliseconds|PERSIST]
summary: Returns the string value of a key after setting its expiration time.
since: 6.2.0
GETRANGE key start end
summary: Returns a substring of the string stored at a key.
since: 2.4.0
GETSET key value
summary: Returns the previous string value of a key after setting it to a new value.
since: 1.0.0
INCR key
summary: Increments the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0
INCRBY key increment
summary: Increments the integer value of a key by a number. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0
INCRBYFLOAT key increment
summary: Increment the floating point value of a key by a number. Uses 0 as initial value if the key doesn't exist.
since: 2.6.0
LCS key1 key2 [LEN] [IDX] [MINMATCHLEN min-match-len] [WITHMATCHLEN]
summary: Finds the longest common substring.
since: 7.0.0
MGET key [key ...]
summary: Atomically returns the string values of one or more keys.
since: 1.0.0
MSET key value [key value ...]
summary: Atomically creates or modifies the string values of one or more keys.
since: 1.0.1
MSETNX key value [key value ...]
summary: Atomically modifies the string values of one or more keys only when all keys don't exist.
since: 1.0.1
PSETEX key milliseconds value
summary: Sets both string value and expiration time in milliseconds of a key. The key is created if it doesn't exist.
since: 2.6.0
SET key value [NX|XX] [GET] [EX seconds|PX milliseconds|EXAT unix-time-seconds|PXAT unix-time-milliseconds|KEEPTTL]
summary: Sets the string value of a key, ignoring its type. The key is created if it doesn't exist.
since: 1.0.0
SETEX key seconds value
summary: Sets the string value and expiration time of a key. Creates the key if it doesn't exist.
since: 2.0.0
SETNX key value
summary: Set the string value of a key only when the key doesn't exist.
since: 1.0.0
SETRANGE key offset value
summary: Overwrites a part of a string value with another by an offset. Creates the key if it doesn't exist.
since: 2.2.0
STRLEN key
summary: Returns the length of a string value.
since: 2.2.0
SUBSTR key start end
summary: Returns a substring from a string value.
since: 1.0.0
127.0.0.1:6379>
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