redis-data structure (hashed hash)

Each hash can store 4,294,967,295 key-value pairs

Type of hash (hash):

Hset Assignment Value

127.0.0.1:6379> hset H1 username java1234
(integer) 1
127.0.0.1:6379> hset H1 Password 123456
(integer) 1

Hget value

127.0.0.1:6379> Hget H1 username
"Java1234"
127.0.0.1:6379> hget H1 Password
"123456"

Hmset multiple fields together set

127.0.0.1:6379> hmset h2 username open1111 password 123456
Ok
127.0.0.1:6379> hget H2 username
"Open1111"
127.0.0.1:6379> hget H2 Password
"123456"

Hmget multiple fields together to get

127.0.0.1:6379> hmget H2 username password
1) "open1111"
2) "123456"

Hgetall get hash all key value pairs

127.0.0.1:6379> Hgetall H2
1) "username"
2) "open1111"
3) "Password"
4) "123456"

Hdel Delete attributes (one or more at a time)

One

127.0.0.1:6379> Hgetall H1
1) "username"
2) "java1234"
3) "Password"
4) "123456"
127.0.0.1:6379> Hdel H1 username
(integer) 1
127.0.0.1:6379> Hgetall H1
1) "Password"
2) "123456"

Multiple

127.0.0.1:6379> Hgetall H2
1) "username"
2) "open1111"
3) "Password"
4) "123456"
127.0.0.1:6379> Hdel H2 username password
(integer) 2
127.0.0.1:6379> Hgetall H2
(empty list or set)

Hincrby adding numbers

127.0.0.1:6379> Hset H1 age 20
(integer) 1
127.0.0.1:6379> Hget H1 Age
"20"
127.0.0.1:6379> Hincrby H1 age 5
(integer) 25
127.0.0.1:6379> Hget H1 Age
"25"

Hexists the existence of a field 1 indicates that there is 0 indicating that there is no

127.0.0.1:6379> hexists H1 Age
(integer) 1
127.0.0.1:6379> hexists H1 Age1
(integer) 0

Hlen Perhaps the number of hash attributes

127.0.0.1:6379> Hgetall H1
1) "Password"
2) "123456"
3) "Age"
4) "25"
127.0.0.1:6379> Hlen H1
(integer) 2

Hkeys Get all property names

127.0.0.1:6379> Hlen H1
(integer) 2
127.0.0.1:6379> Hkeys H1
1) "Password"
2) "Age"

Hvals Get all property values

127.0.0.1:6379> Hgetall H1
1) "Password"
2) "123456"
3) "Age"
4) "25"
127.0.0.1:6379> hvals H1
1) "123456"
2) "25"