Redis Basic Commands

Mac run redis

redis-server
redis-cli

Redis Datatypes

1. String
2. List
3. Hashes
4. Sets
5. Sorted Sets (zset)

Keys

setex

命令為指定的key 設置值及其過期時間. 如果key 已經存在, SETEX 命令將會替換舊的值. 單位是秒. SETEX KEY_NAME TIMEOUT VALUE

local:0>setex key 10 "kimi"
"OK"
local:0>ttl key
"8"
local:0>ttl key
"7"
local:0>ttl key
"6"
local:0>pttl key
"5265"
local:0>ttl key
"4"
local:0>ttl key
"3"
local:0>get key
"kimi"
local:0>ttl key
"-2"
local:0>get key
null

Pattern Matching with keys

Return all keys matching pattern

• h?llo match hello, hallo and hxllo
• h*llo match hllo and heeeeello
• h[ae]llo match hello and hallo, but not hillo
• h[^e]llo match hallo, hbllo ..., but not hello
• h[a-b]llo match hallo, hbllo

127.0.0.1:6379> set hello 1
OK
127.0.0.1:6379> set hallo 2
OK
127.0.0.1:6379> set hbllo 3
OK
127.0.0.1:6379> set hxllo 4
OK
127.0.0.1:6379> set haaallo 5
OK

127.0.0.1:6379> keys *
1) "hello"
2) "hallo"
3) "hxllo"
4) "hbllo"
5) "haaallo"
127.0.0.1:6379> keys h?llo
1) "hello"
2) "hallo"
3) "hxllo"
4) "hbllo"

Shutdown Command

shutdown [NOSAVE|SAVE]

shutdown NOSAVE

Dump & Restore in Redis

Dump

DUMP key

時間複雜度：查找給定鍵的複雜度為O(1). http://redisdoc.com/internal/dump.html

Example:

```

##### Restore

`RESTORE key ttl serialized-value [REPLACE]`

http://redisdoc.com/internal/restore.html

## Cheet Sheet

Set Key value

Get Key

DEL key1 key2 key3 (To delete a key).

EXISTS key1 key2 (To check a key exist or not).

TTL key  (To check time to live).

EXPIRE key 10(in seconds).

PTTL mykey (to check time in millisecond).

PEXPIRE mykey 1500 (Time in Milliseconds).

PERSIST mykey (Remove EXPIRATION from the key)

KEYS a?? (Returns all keys matching pattern)

Supported glob-style patterns: • h?llo matches hello, hallo and hxllo • h*llo matches hllo and heeeello • h[a]llo matches hello and hallo, but not hillo • h["e]llo matches hallo, hbllo, ... but not hello • h[a-b]1lo matches hallo and hbllo ```

RANDOMKEY (Return a random key from the currently selected database)

RENAME mykey myotherkey

RENAMENX mykey myotherkey (Renames key to newkey if newkey does not yet exist)

TOUCH key1 key2 (Alters the last access time of a key(s).

UNLINK key1 key2 key3 (The actual removal will happen later asynchronously.)

TYPE key1 (Return Type of Value)

DUMP mykey (Serialize the value stored at the key in a Redis-specific format)

RESTORE mykey 0 "\n\x17\x17\x00\x00\x00\x12\x00\x00\x00\x03\x00\”