Redis03 using Redis Database (hashes type)

Type and operation of a hashes

Redis Hash is a string-type field and value mapping table. It's added, the delete operation is 0 (1) (average). Hash is particularly suitable for storing objects, compared to Gencun each word of an object into a single string type. Storing an object in a hash type consumes less memory and makes it easier to access the entire object.

1 Hset

Sets the hash field to the specified value, and if key does not exist, it is created first.

Redis 127.0.0.1:6379> hset user:001 name Lisi
(integer) 0
Redis 127.0.0.1:6379> hget user:001 Name
"Lisi"

2.hsetnx

Sets the hash field to the specified value, and if key does not exist, it is created first. Returns 0 if present.

127.0. 0.1:6379> Hsetnx User:0010127.0. 0.1:6379> Hget User:001  name"Lisi"

3,hmset

Multiple field with hash set

Redis127.0.0.1:6379>hmset myhash field1 Hello field2 worldokredis127.0.0.1:6379>hget myhash field1"Hello"Redis127.0.0.1:6379>hget Myhash field2" World"Redis127.0.0.1:6379>

4 Hget

Gets the specified hash field

5. Hmget

Gets all the specified hash field

Redis127.0.0.1:6379>hmset myhash field1 Hello field2 worldokredis127.0.0.1:6379>hget myhash field1"Hello"Redis127.0.0.1:6379>hget Myhash field2" World"Redis127.0.0.1:6379>hmget myhash field1 field21)"Hello"2)" World"

6. Hincrby

Specifies the hash field plus the given value.

Redis127.0.0.1:6379> Hset Myhash Age1(integer)1Redis127.0.0.1:6379>hget Myhash Age"1"Redis127.0.0.1:6379> Hincrby Myhash Age8(integer)9Redis127.0.0.1:6379>hget Myhash Age"9"

7. hexists

Tests whether the specified field exists.

127.0. 0.1:6379>1

8 Hlen

Returns the number of field for the specified hash

127.0. 0.1:6379>3

9. Hdel

Delete field with specified hash

127.0. 0.1:6379>1

Ten. Hkeys

Return hash of all field

127.0. 0.1:6379> hkeys myhash1"field2"2"  Age"

Hgetall.

Gets all the field and value in a hash.

127.0. 0.1:6379> hgetall myhash1"field2"2 "  World " 3 "  Age " 4 " 9 "

Redis03 using Redis Database (hashes type)