[Redis Chapter4] Hash

Hasehes

Redis Hash is a string-type field and value mapping table. Hash is particularly suitable for storing objects . Save as a string, you can now use less memory in a hash type. And it can be more convenient to store the entire object.

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 1 Sex

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"

This article is from the "Software Design and Development" blog, please be sure to keep this source http://yuanzhitang.blog.51cto.com/2769219/1783356

[Redis Chapter4] Hash