Shulou(Shulou.com)06/01 Report--

Keys

(1) introduction: returns all key that meet the conditions. Regular rules are supported.

(2) Syntax: keys key

(3) for example:

Exists

(1) introduction: confirm whether a key exists. If it exists, it returns 0. If it does not exist, it returns 1.

(2) Syntax: exists key

(3) for example:

Del

(1) introduction: delete a key

(2) Syntax: del key

(3) for example:

Rename

(1) introduction: renaming key

(2) Syntax: rename old_key new_key

(3) for example:

Type

(1) introduction: get the type of return value

(2) Syntax: type key

(3) for example:

The life cycle of key

(1) introduction: Redis is more often used as a cache in actual use, but the cached data generally needs to be set for survival time, that is, data is destroyed after expiration.

(2) grammar:

EXPIRE key seconds sets the time to live of key (in seconds). How many seconds will key delete automatically?

TTL key to see how long key was born.

PERSIST key clear time to Live

PEXPIRE key milliseconds time to live is set in milliseconds

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