Detail the Redis command and key _ power node Java college collation

The Redis command is used to perform certain operations on the redis server.

To run a command on an Redis server, you need an Redis client. The Redis client is in the Redis package, which we have already installed and used before.

grammar

The basic syntax of Redis client is as follows:

$redis-cli

example

The following example shows how to use the Redis client.

To start the redis client, open the terminal and enter the command Redis command line: redis-cli. This will connect to the local server and you can now run the various commands.

$redis-cli
redis 127.0.0.1:6379>
redis 127.0.0.1:6379> PING
PONG

In the above example, we connect to the Redis server running on the local machine and execute the ping command to check if the server is running.

Run the command on the remote server

To run the command on the Redis remote server, you need to connect to the server via the same client, redis-cli

grammar

$ redis-cli -h host -p port -a password

For example,

The following example demonstrates how to connect to a remote server on Redis host: 127.0.0.1, port: 6379, and add the authentication password: mypass.

$redis-cli -h 127.0.0.1 -p 6379 -a "mypass"
redis 127.0.0.1:6379>
redis 127.0.0.1:6379> PING
PONG

The keys command of Redis is used to manage keys. The keys command syntax using Redis is as follows:

grammar

redis 127.0.0.1:6379> COMMAND KEY_NAME

example

redis 127.0.0.1:6379> SET yiibai redis
OK
redis 127.0.0.1:6379> DEL yiibai
(integer) 1

In the example above, DEL is the command and yiibai is the key. If the key is deleted then the output command will be (integer) 1, otherwise it will be (integer) 0

Key command for Redis

The following table shows the basic commands for the keys:

S.N.	命令 & 描述
1	DEL key 此命令删除键，如果存在
2	DUMP key  该命令返回存储在指定键的值的序列化版本。
3	EXISTS key  此命令检查该键是否存在。
4	EXPIRE key seconds 指定键的过期时间
5	EXPIREAT key timestamp  指定的键过期时间。在这里，时间是在Unix时间戳格式
6	PEXPIRE key milliseconds  设置键以毫秒为单位到期
7	PEXPIREAT key milliseconds-timestamp  设置键在Unix时间戳指定为毫秒到期
8	KEYS pattern  查找与指定模式匹配的所有键
9	MOVE key db  移动键到另1个数据库
10	PERSIST key  移除过期的键
11	PTTL key  以毫秒为单位获取剩余时间的到期键。
12	TTL key  获取键到期的剩余时间。
13	RANDOMKEY  从Redis返回随机键
14	RENAME key newkey  更改键的名称
15	RENAMENX key newkey  重命名键，如果新的键不存在
16	TYPE key  返回存储在键的数据类型的值。

string

grammar

redis 127.0.0.1:6379> COMMAND KEY_NAME

example

redis 127.0.0.1:6379> SET yiibai redis
OK
redis 127.0.0.1:6379> GET yiibai
"redis"

In the example above, set and get are commands, while yiibai is the key.

Redis string command

The following table shows some basic commands for managing strings at Redis:

S.N.	命令 & 描述
1	SET key value  此命令用于在指定键设置值
2	GET key  键对应的值。
3	GETRANGE key start end  得到字符串的子字符串存放在1个键
4	GETSET key value 设置键的字符串值，并返回旧值
5	GETBIT key offset 返回存储在键位值的字符串值的偏移
6	MGET key1 [key2..] 得到所有的给定键的值
7	SETBIT key offset value 设置或清除该位在存储在键的字符串值偏移
8	SETEX key seconds value 键到期时设置值
9	SETNX key value 设置键的值，只有当该键不存在
10	SETRANGE key offset value 覆盖字符串的1部分从指定键的偏移
11	STRLEN key 得到存储在键的值的长度
12	MSET key value [key value ...] 设置多个键和多个值
13	MSETNX key value [key value ...]  设置多个键多个值，只有在当没有按键的存在时
14	PSETEX key milliseconds value 设置键的毫秒值和到期时间
15	INCR key 增加键的整数值1次
16	INCRBY key increment 由给定的数量递增键的整数值
17	INCRBYFLOAT key increment 由给定的数量递增键的浮点值
18	DECR key 递减键1次的整数值
19	DECRBY key decrement 由给定数目递减键的整数值
20	APPEND key value 追加值到1个键

conclusion