Redis运维之常用命令操作

在平时的工作中，需要根据需求对Redis数据库进行一些操作。
可以参考Redis官网http://redis.io/commands 进行详细了解
1.SELECT 切换数据库

redis 127.0.0.1:6379[1]> HELP SELECT

SELECT index
summary: Change the selected database for the current connection
since: 1.0.0
group: connection

redis 127.0.0.1:6379[1]> SELECT 2
OK

2.LLEN 得到一个列表的长度

redis 127.0.0.1:6379[2]> HELP LLEN

LLEN key
summary: Get the length of a list
since: 1.0.0
group: list

redis 127.0.0.1:6379[2]> LLEN bi
(integer) 412

3.LRANGE 获取一个列表的所有元素
LRANGE 索引是以0开始的，0表示第一个元素，-1表示最后一个元素

redis 127.0.0.1:6379[2]> HELP LRANGE

LRANGE key start stop
summary: Get a range of elements from a list
since: 1.0.0
group: list

redis 127.0.0.1:6379[2]> LRANGE bi 0 5

4.LPUSH 将一个或多个值添加到一个列表的开头

redis 127.0.0.1:6379[2]> HELP LPUSH

LPUSH key value [value ...]
summary: Prepend one or multiple values to a list
since: 1.0.0
group: list

redis 127.0.0.1:6379[2]> LPUSH bi http://abc.com/logUserLogin?event_id=25&uid=de721bcef5cba1fc182d18[/code]   5.RPUSH 将一个或多个值追加到一个列表的末尾
redis 127.0.0.1:6379[2]> HELP RPUSH

RPUSH key value [value ...]
summary: Append one or multiple values to a list
since: 1.0.0
group: list

redis 127.0.0.1:6379[2]> RPUSH bi http://abc.com/logUserLogin?event_id=25&uid=de721bcef5cba1fc182d18[/code]   6.SAVE 同步数据到磁盘
SAVE命令执行的时候会阻塞连接，所以生成环境最好使用BGSAVE命令
redis 127.0.0.1:6379[2]> HELP SAVE

SAVE -
summary: Synchronously save the dataset to disk
since: 1.0.0
group: server

redis 127.0.0.1:6379[2]> SAVE
OK
(1.33s)
    7.BGSAVE 异步数据到磁盘
使用BGSAVE,Redis将会在后台执行保存数据的操作，不影响正常的客户端连接，Redis将会fork出一个子进程用于保存数据，父进程继续处理客户端请求。
redis 127.0.0.1:6379[2]> HELP BGSAVE

BGSAVE -
summary: Asynchronously save the dataset to disk
since: 1.0.0
group: server

redis 127.0.0.1:6379[2]> BGSAVE
Background saving started
   8.TYPE 判断一个KEY的类型
redis 127.0.0.1:6379[2]> HELP TYPE

TYPE key
summary: Determine the type stored at key
since: 1.0.0
group: generic

redis 127.0.0.1:6379[2]> TYPE bi
list


9.BGREWRITEAOF
异步重写AOF文件，Redis将会创建一个对当前AOF文件优化过的AOF版本。
redis 127.0.0.1:6379> help BGREWRITEAOF

BGREWRITEAOF -
summary: Asynchronously rewrite the append-only file
since: 1.0.0
group: server


10.CONFIG GET

获取某个配置项的值
redis 127.0.0.1:6379> help config get

CONFIG GET parameter
summary: Get the value of a configuration parameter
since: 2.0.0
group: server

redis 127.0.0.1:6379> config get maxmemory
1) "maxmemory"
2) "0"


11.CONFIG SET

设置某个参数的值
redis 127.0.0.1:6379> help config set

CONFIG SET parameter value
summary: Set a configuration parameter to the given value
since: 2.0.0
group: server

redis 127.0.0.1:6379> config set maxmemory 200000000
OK


12.DBSIZE

返回当前数据库的KEY值得数量
redis 127.0.0.1:6379[3]> HELP DBSIZE

DBSIZE -
summary: Return the number of keys in the selected database
since: 1.0.0
group: server

redis 127.0.0.1:6379[3]> dbsize
(integer) 12502


13.DEL
删除一个KEY值
redis 127.0.0.1:6379> help del

DEL key [key ...]
summary: Delete a key
since: 1.0.0
group: generic

redis 127.0.0.1:6379> del foo
(integer) 1


14.EXISTS
检查一个KEY是否存在
redis 127.0.0.1:6379> help exists

EXISTS key
summary: Determine if a key exists
since: 1.0.0
group: generic

redis 127.0.0.1:6379> exists foo
(integer) 1


15.SET 命令
设置一个KEY的值

redis 127.0.0.1:6379> help set

SET key value
summary: Set the string value of a key
since: 1.0.0
group: string

redis 127.0.0.1:6379> set foo test
OK
redis 127.0.0.1:6379>


16.PERSIST
删除一个KEY的过期时间

edis 127.0.0.1:6379> help persist

PERSIST key
summary: Remove the expiration from a key
since: 2.2.0
group: generic


17.RENAME
重新命名一个KEY
redis 127.0.0.1:6379> help rename

RENAME key newkey
summary: Rename a key
since: 1.0.0
group: generic

redis 127.0.0.1:6379> rename foo footest
OK
redis 127.0.0.1:6379>


18.EXPIRE
为一个KEY设置一个TTL过期时间
redis 127.0.0.1:6379> help expire

EXPIRE key seconds
summary: Set a key's time to live in seconds
since: 1.0.0
group: generic

redis 127.0.0.1:6379> expire footest 300
(integer) 1


19.TTL

获取过期时间
redis 127.0.0.1:6379> help ttl

TTL key
summary: Get the time to live for a key
since: 1.0.0
group: generic

redis 127.0.0.1:6379> ttl footest
(integer) 289
redis 127.0.0.1:6379> ttl footest
(integer) 285
redis 127.0.0.1:6379> ttl footest
(integer) 283
redis 127.0.0.1:6379> ttl footest
(integer) 282
redis 127.0.0.1:6379> ttl footest
(integer) 282
redis 127.0.0.1:6379>


20.EXPIREAT
设置一个KEY的过期时间，以UNIX时间戳表示
redis 127.0.0.1:6379> help expireat

EXPIREAT key timestamp
summary: Set the expiration for a key as a UNIX timestamp
since: 1.2.0
group: generic

redis 127.0.0.1:6379> expireat foo 1431532800
(integer) 1
redis 127.0.0.1:6379> ttl foo
(integer) 3210141


21.GET
获取一个KEY的值
redis 127.0.0.1:6379> help get

GET key
summary: Get the value of a key
since: 1.0.0
group: string

redis 127.0.0.1:6379> get foo
"test"


22.HGET

获取一个哈希字段的值

redis 127.0.0.1:6379> help hget

HGET key field
summary: Get the value of a hash field
since: 2.0.0
group: hash

redis 127.0.0.1:6379> hset myhash field1 "foo"
(integer) 1
redis 127.0.0.1:6379> hget myhash field1
"foo"
redis 127.0.0.1:6379> hget myhash field2
(nil)
redis 127.0.0.1:6379>


23.LASTSAVE
上次成功保存数据到磁盘的UNIX时间戳

redis 127.0.0.1:6379> help lastsave

LASTSAVE -
summary: Get the UNIX time stamp of the last successful save to disk
since: 1.0.0
group: server

redis 127.0.0.1:6379> lastsave
(integer) 1428373205
redis 127.0.0.1:6379>


24.LPUSH
将一个或多个值附加到一个Redis列表中

redis 127.0.0.1:6379> help lpush

LPUSH key value [value ...]
summary: Prepend one or multiple values to a list
since: 1.0.0
group: list

redis 127.0.0.1:6379> lpush mylist a b c
(integer) 6
redis 127.0.0.1:6379> LRANGE mylist  0 -1
1) "c"
2) "b"
3) "a"
4) "c"
5) "b"
6) "a"
redis 127.0.0.1:6379> llen mylist
(integer) 6


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