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

Redis's operation command for key

Del key1 key2... Keyn

Function: delete 1 or more keys

Return value: ignore the key that does not exist and return the number of key actually deleted

Rename key newkey

Function: give key a new key name

Note: if newkey already exists, the original value of newkey is overwritten

Renamenx key newkey

Function: rename key to newkey

Return: 1 for modification, 0 for no modification

Note: nx-- > not exists, that is, rename when newkey does not exist

Move key db

Redis 127.0.0.1 6379 [1] > select 2

OK

Redis 127.0.0.1 redis [2] > keys

(empty list or set)

Redis 127.0.1 6379 [2] > select 0

OK

Redis 127.0.0.1 6379 > keys

1) "name"

2) "cc"

3) "a"

4) "b"

Redis 127.0.0.1 6379 > move cc 2

(integer) 1

Redis 127.0.0.1 6379 > select 2

OK

Redis 127.0.0.1 6379 [2] > keys *

1) "cc"

Redis 127.0.0.1 redis [2] > get cc

"3"

(note: a redis process opens more than one database. 16 databases are opened by default, numbered from 0 to 15. If you want to open more databases, you can modify them from the configuration file.)

Keys pattern queries the corresponding key

In redis, fuzzy query key is allowed

There are three wildcards,?, []

: with any number of characters

?: with a single character

[]: a character in parentheses

Redis 127.0.0.1 6379 > flushdb

OK

Redis 127.0.0.1 6379 > keys

(empty list or set)

Redis 127.0.0.1 three 6379 > mset one 1 two 2 three 3 four 4

OK

Redis 127.0.0.1 6379 > keys o

1) "one"

Redis 127.0.0.1 6379 > key o

(error) ERR unknown command 'key'

Redis 127.0.0.1 6379 > keys o

1) "two"

Redis 127.0.0.1 6379 > keys

1) "one"

2) "two"

Redis 127.0.0.1 6379 > keys on

1) "one"

Redis 127.0.0.1 6379 > set ons yes

OK

Redis 127.0.0.1 eaw 6379 > keys on [eaw]

1) "one"

Randomkey returns random key

...

Exists key

To determine whether key exists or not, return 1 Universe 0

Type key

Returns the type of value stored in key

There's string,link,set,order set, hash.

Ttl key

Purpose: query the lifecycle of key

Return: seconds

Note: for key that does not exist or key that does not expire key/ that has expired,-1 is returned

In Redis2.8, for key that does not exist, return-2

Expire key integer value

Function: sets the life cycle of key in seconds

By the same token:

Pexpire key milliseconds, set lifecycle

Pttl key, which returns the life cycle in milliseconds

Persist key

Function: set the specified key to be permanent

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