[Redis Chapter4] Hash

Posted 2020-07-13

Hasehes 

Redis hash是一个string类型的field和value映射表。hash特别适合于存储对象。相对存成string，现在存为一个hash类型中可以占用更少的内存。且可以更方便的存储整个对象。

hset

redis 127.0.0.1:6379> hset user:001 name michael

(integer) 1

redis 127.0.0.1:6379> hget user:001 name

"michael"

hsetnx

redis 127.0.0.1:6379> hsetnx user:003 name jason

(integer) 1

redis 127.0.0.1:6379> hsetnx user:003 name tom

(integer) 0 -- set failed

redis 127.0.0.1:6379> hget user:003 name

"jason"  -- value is not changed.

hmset/hmget

redis 127.0.0.1:6379> hmset user:004 name michael age 29 sex 1

OK

redis 127.0.0.1:6379> hget user:004 name

"michael"

redis 127.0.0.1:6379> hget user:004 age

"29"

redis 127.0.0.1:6379> hget user:004 sex

"1"

redis 127.0.0.1:6379> hmget user:004 name age sex

1) "michael"

2) "29"

3) "1"

hincrby 

redis 127.0.0.1:6379> hincrby user:004 age 5

(integer) 34

redis 127.0.0.1:6379> hget user:004 age

"34"

hexists 

redis 127.0.0.1:6379> hexists user:004 age

(integer) 1

redis 127.0.0.1:6379> hexists user:004 address

(integer) 0

hlen 

redis 127.0.0.1:6379> hlen user:004

(integer) 3

hdel 

redis 127.0.0.1:6379> hdel user:004 age

(integer) 1

redis 127.0.0.1:6379> hexists user:004 address

(integer) 0

redis 127.0.0.1:6379> hget user:004 age

(nil)

hkeys hvals hgetall 

redis 127.0.0.1:6379> hkeys user:004

1) "name"

2) "sex"

redis 127.0.0.1:6379> hvals user:004

1) "michael"

2) "1"

redis 127.0.0.1:6379> hgetall user:004

1) "name"

2) "michael"

3) "sex"

4) "1"

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