THE
Form: DEL key [key ...]
Role: delete one or more keys. Non-existing keys are ignored.
Return value: The number of deleted keys.
Example:
192.168.1.100:6379> set testkey 1
OK
# If the deletion is successful, return the number of deleted keys
192.168.1.100:6379> del testkey
(integer) 1
# key does not exist return 0
192.168.1.100:6379> del testkey
(integer) 0
EXISTS
Format: EXISTS key
Function: Check whether the key exists.
Return value: Returns 1 if exists, otherwise returns 0.
Example:
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> exists testkey
(integer) 1
192.168.1.100:6379> del testkey
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 0
EXPIRE
Format: EXPIRE key seconds
Function: Set the time-to-live for a given key in seconds. When the key expires, it will be automatically deleted. Execute the EXPIRE command on a key that already has a time-to-live, and the new time-to-live will replace the old time-to-live. The unit of PEXPIRE command is milliseconds.
Return value: return 1 if the setting is successful. Returns 0 when the key does not exist or the time-to-live cannot be set for the key.
Example:
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> expire testkey 5
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 0
EXPIREAT
Format: EXPIREAT key timestamp
Function: Set the time-to-live for the key, the time is the UNIX timestamp, the unit is seconds. The PEXPIREAT command unit is milliseconds.
Return value: return 1 if the setting is successful. Returns 0 when the key does not exist or the time-to-live cannot be set for the key.
Example:
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> expireat testkey 1486456903
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 0
KEYS
Format: KEYS pattern
Function: Find a list of keys that meet the requirements of the pattern format. pattern can use the following wildcards
? matches only one arbitrary character.
* matches any character.
[] matches optional characters.
\x escapes x.
Return value: a list of keys that meet the requirements of pattern format.
Example:
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> keys test*
1) "testkey"
(1.92s)
192.168.1.100:6379> keys test?ey
1) "testkey"
(1.72s)
192.168.1.100:6379> del 'testkey'
(integer) 1
192.168.1.100:6379> keys test*
(empty list or set)
(1.71s)
PERSIST
Format: PERSIST key
Effect: Remove the time-to-live for the given key.
Return value: 1 is returned on success, 0 is returned on failure or the key does not exist.
Example:
192.168.1.100:6379> persist testkey
(integer) 0
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> expire testkey 15
(integer) 1
192.168.1.100:6379> persist testkey
(integer) 1
192.168.1.100:6379> exists testkey
(integer) 1
SORT
格式：SORT key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern ...]] [ASC | DESC] [ALPHA] [STORE destination]
Function: Sort lists, sets, and ordered sets, and return the sorted results or save them to destination. Sorts numerically by default.
Return value: the number of sorted results or destination elements.
Example:
# Initialization data
192.168.1.100:6379> sadd testkey 4
(integer) 1
192.168.1.100:6379> sadd testkey 3
(integer) 1
192.168.1.100:6379> sadd testkey 8
(integer) 1
# Sort the collection, default is ascending
192.168.1.100:6379> sort testkey
1) "3"
2) "4"
3) "8"
# sort the collection in descending order
192.168.1.100:6379> sort testkey DESC
1) "8"
2) "4"
3) "3"
# Use limit to limit the range
192.168.1.100:6379> sort testkey DESC limit 1 1
1) "4"
# Initialization data
192.168.1.100:6379> set testkey_4 100
OK
192.168.1.100:6379> set testkey_3 50
OK
192.168.1.100:6379> set testkey_8 10
OK
# Use by to specify the reference key for sorting, and use * to match the value of testkey
192.168.1.100:6379> sort testkey by testkey_ * DESC
1) "4"
2) "3"
3) "8"
# use get to return the associated data
192.168.1.100:6379> sort testkey by testkey_ * DESC get testkey_ *
1) "100"
2) "50"
3) "10"
#sort sorts by number by default, which will be converted to double-precision numbers. For strings, using sort directly will report an error. Adding alpha can require sort to sort in lexicographical order.
192.168.1.100:6379> sadd testkey a
(integer) 1
192.168.1.100:6379> sadd testkey b
(integer) 1
192.168.1.100:6379> sadd testkey c
(integer) 1
192.168.1.100:6379> sort testkey
(error) ERR One or more scores can't be converted into double
192.168.1.100:6379> sort testkey alpha
1) "a"
2) "b"
3) "c"
TTL
Format: TTL key
Function: Query the remaining time of the key with the time-to-live set, in seconds.
Return value: Returns the remaining time under normal circumstances, returns -1 if the key does not set the time-to-live, and returns -2 if the key does not exist.
Example:
192.168.1.100:6379> set testkey 1
OK
192.168.1.100:6379> expire testkey 50
(integer) 1
192.168.1.100:6379> ttl testkey
(integer) 47
192.168.1.100:6379> ttl testkey
(integer) 29
192.168.1.100:6379> ttl testkey
(integer) -2
TYPE
Format: TYPE key
Role: return the type of key
Return value: type of key
Example:
# string type
192.168.1.100:6379> set testkey1 2
OK
192.168.1.100:6379> type testkey1
string
#collection type
192.168.1.100:6379> sadd testkey2 d
(integer) 1
192.168.1.100:6379> type testkey2
set
#list type
192.168.1.100:6379> lpush testkey3 d
(integer) 1
192.168.1.100:6379> type testkey3
list
# hash type
192.168.1.100:6379> hset testkey4 tt
(integer) 1
192.168.1.100:6379> type testkey4
hash
# Sorted collection type
192.168.1.100:6379> zadd testkey5 100 d
(integer) 1
192.168.1.100:6379> type testkey5
zset
Original address: http://caiguoqing.org/post/103