Redis:命令：修订间差异

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Riguz（留言 | 贡献）
行政员、​界面管理员、​管理员
1,298次编辑
 
（未显示同一用户的12个中间版本）
第1行： 第1行：
= 基本操作 =
==增删改查==
===设置key的value===
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
> set mykey somevalue
OK
> get mykey
"somevalue"
</syntaxhighlight>
设置的时候支持附加条件，仅在value不存在（或者存在）的时候才设置值
<syntaxhighlight lang="bash">
> set mykey newval nx
(nil)
> set mykey newval xx
OK
</syntaxhighlight>
===数字操作===
可通过 <span class="article-label">INCR</span>, <span class="article-label">INCRBY</span>, <span class="article-label">DECR</span> and <span class="article-label">DECRBY</span>等操作数字：
<syntaxhighlight lang="bash">
> set counter 100
OK
> incr counter
(integer) 101
> incr counter
(integer) 102
> incrby counter 50
(integer) 152
</syntaxhighlight>
===批量设置===
<syntaxhighlight lang="bash">
> mset a 10 b 20 c 30
OK
> mget a b c
1) "10"
2) "20"
3) "30"
</syntaxhighlight>
===查询key的类型及存在与否===
<syntaxhighlight lang="bash">
> set mykey hello
OK
> exists mykey
(integer) 1
> del mykey
(integer) 1
> exists mykey
(integer) 0
> set mykey x
OK
> type mykey
string
> del mykey
(integer) 1
> type mykey
none
</syntaxhighlight>
==TTL操作==
===设置key的ttl===
<syntaxhighlight lang="bash">
> set key some-value
OK
> expire key 5
(integer) 1
> get key (immediately)
"some-value"
> get key (after some time)
(nil)
</syntaxhighlight>
可以一次性设置key和ttl：
<syntaxhighlight lang="bash">
> set key 100 ex 10
OK
> ttl key
(integer) 9
</syntaxhighlight>
==List操作==
===list插入及查询===
<syntaxhighlight lang="bash">
> rpush mylist A
(integer) 1
> rpush mylist B
(integer) 2
> lpush mylist first
(integer) 3
> lrange mylist 0 -1
1) "first"
2) "A"
3) "B"


redis-cli
> rpush mylist 1 2 3 4 5 "foo bar"
select 4
(integer) 9
keys *
</syntaxhighlight>
del foo
===从list中取出数据===
<syntaxhighlight lang="bash">
> rpush mylist a b c
(integer) 3
> rpop mylist
"c"
> rpop mylist
"b"
> rpop mylist
"a"
> rpop mylist
(nil)
</syntaxhighlight>
===裁剪list===
<syntaxhighlight lang="bash">
> rpush mylist 1 2 3 4 5
(integer) 5
> ltrim mylist 0 2
OK
> lrange mylist 0 -1
1) "1"
2) "2"
3) "3"
</syntaxhighlight>
</syntaxhighlight>
===阻塞操作===
"wait for elements in the list tasks, but return if after 5 seconds no element is available"
<syntaxhighlight lang="bash">
> brpop tasks 5
1) "tasks"
2) "do_something"
</syntaxhighlight>
Notes:
* It is possible to build safer queues or rotating queues using <span class="article-label">LMOVE</span>.
* There is also a blocking variant of the command, called <span class="article-label">BLMOVE</span>.
==Hash操作==
===设置及查询===
<syntaxhighlight lang="bash">
> hmset user:1000 username antirez birthyear 1977 verified 1
OK
> hget user:1000 username
"antirez"
> hget user:1000 birthyear
"1977"
> hgetall user:1000
1) "username"
2) "antirez"
3) "birthyear"
4) "1977"
5) "verified"
6) "1"
</syntaxhighlight>
<syntaxhighlight lang="bash">
> hmget user:1000 username birthyear no-such-field
1) "antirez"
2) "1977"
3) (nil)
</syntaxhighlight>
<syntaxhighlight lang="bash">
> hincrby user:1000 birthyear 10
(integer) 1987
> hincrby user:1000 birthyear 10
(integer) 1997
</syntaxhighlight>
==Set操作==
===设置及查询===
<syntaxhighlight lang="bash">
> sadd myset 1 2 3
(integer) 3
> smembers myset
1. 3
2. 1
3. 2
</syntaxhighlight>
> sismember myset 3
(integer) 1
> sismember myset 30
(integer) 0


[[Category:Database]]
[[Category:Database]]

2021年5月6日 (四) 02:24的最新版本

基本操作

增删改查

设置key的value

> set mykey somevalue
OK
> get mykey
"somevalue"

设置的时候支持附加条件，仅在value不存在（或者存在）的时候才设置值 

> set mykey newval nx
(nil)
> set mykey newval xx
OK

数字操作

可通过 INCR, INCRBY, DECR and DECRBY等操作数字： 

> set counter 100
OK
> incr counter
(integer) 101
> incr counter
(integer) 102
> incrby counter 50
(integer) 152

批量设置

> mset a 10 b 20 c 30
OK
> mget a b c
1) "10"
2) "20"
3) "30"

查询key的类型及存在与否

> set mykey hello
OK
> exists mykey
(integer) 1
> del mykey
(integer) 1
> exists mykey
(integer) 0

> set mykey x
OK
> type mykey
string
> del mykey
(integer) 1
> type mykey
none

TTL操作

设置key的ttl

> set key some-value
OK
> expire key 5
(integer) 1
> get key (immediately)
"some-value"
> get key (after some time)
(nil)

可以一次性设置key和ttl： 

> set key 100 ex 10
OK
> ttl key
(integer) 9

List操作

list插入及查询

> rpush mylist A
(integer) 1
> rpush mylist B
(integer) 2
> lpush mylist first
(integer) 3
> lrange mylist 0 -1
1) "first"
2) "A"
3) "B"

> rpush mylist 1 2 3 4 5 "foo bar"
(integer) 9

从list中取出数据

> rpush mylist a b c
(integer) 3
> rpop mylist
"c"
> rpop mylist
"b"
> rpop mylist
"a"
> rpop mylist
(nil)

裁剪list

> rpush mylist 1 2 3 4 5
(integer) 5
> ltrim mylist 0 2
OK
> lrange mylist 0 -1
1) "1"
2) "2"
3) "3"

阻塞操作

"wait for elements in the list tasks, but return if after 5 seconds no element is available" 

> brpop tasks 5
1) "tasks"
2) "do_something"

Notes:

  • It is possible to build safer queues or rotating queues using LMOVE.
  • There is also a blocking variant of the command, called BLMOVE.

Hash操作

设置及查询

> hmset user:1000 username antirez birthyear 1977 verified 1
OK
> hget user:1000 username
"antirez"
> hget user:1000 birthyear
"1977"
> hgetall user:1000
1) "username"
2) "antirez"
3) "birthyear"
4) "1977"
5) "verified"
6) "1"

> hmget user:1000 username birthyear no-such-field
1) "antirez"
2) "1977"
3) (nil)

> hincrby user:1000 birthyear 10
(integer) 1987
> hincrby user:1000 birthyear 10
(integer) 1997

Set操作

设置及查询

> sadd myset 1 2 3
(integer) 3
> smembers myset
1. 3
2. 1
3. 2

> sismember myset 3 (integer) 1 > sismember myset 30 (integer) 0

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