Redis Learning Notes (additions and deletions)

Redis Learning Notes (add and subtract) adds a key to the database

SET key value

Get the key in the database

KEYS pattern

Pattern supports GLOB style wildcard format

"?" matches one character

"*" matches any character

"[]" matches any one of the characters between parentheses, you can use the "-" symbol to represent a range, for example: A[a-z]c

"\x" matches the character X, which is used to escape characters. If you need to match "?", you need to use \?

Keys * (deprecated, queries can affect performance if too many keys are in the library)

Determine if a key exists

How to exist returns 1, does not exist return 0:

redis> Exists key

(integer) 1

Delete key

Redis> del key ... .

Multiple keys can be deleted at the same time, the number of deleted keys will be returned, and if no this key will return 0

High-performance removal

The DEL command does not support wildcards and can be combined with the Linux pipeline and the Xargs command to remove all rules-compliant keys

For example: Delete all keys that begin with "haha:".

Under the Linux command line:

redis-cli KEYS "haha:*" | xargs redis-cli DEl   (单个key作为参数)redis-cli del ‘redis-cli keys "haha:*"‘    (多个键作为参数..没测成功)

Gets the data type of the key value

TYPE *key*

The return value may be string (string type), hash (hash type), list (list type), set (collection type), Zset (ordered collection type)

Redis Learning Notes (additions and deletions)