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HASHED CMD

HSET​

The HSET command is used to set the value of a field in a hash.

HSET key field value
  • key: The name of the hash key.
  • field: The name of the field within the hash.
  • value: The value to associate with the field.

Example:

127.0.0.1:6379> HSET user:1 name ayah age 27 country jordan "job description" "backend develper"
(integer) 4
127.0.0.1:6379> HSET user:2 name sham age 24 country jordan "job description" "backend develper"
(integer) 4
127.0.0.1:6379> HSET user:3 name nour age 22 country jordan "job description" "backend develper"
(integer) 4
       _____ 1 ----> "name":"ayah", "age":"27", "country":"jordan", "job description":"backend develper"
      |
user__|_____ 2 ----> "name":"sham", "age":"24", "country":"jordan", "job description":"backend develper"
      |
      |_____ 3 ----> "name":"nour", "age":"22", "country":"jordan", "job description":"backend develper"

HGET​

The HGET command is used to get the value associated with a field in a hash.

HGET key field
  • key: The name of the hash key.
  • field: The name of the field within the hash.

Example:

127.0.0.1:6379> hget user:1 name
"ayah"
127.0.0.1:6379> hget user:2 age
"27"
127.0.0.1:6379> hget user:3 country
"jordan"

HGETALL​

The HGETALL command is used to get all fields and values of a hash.

HGETALL key
  • key: The name of the hash key.

Example:

127.0.0.1:6379> HGETALL user:1
1) "name"
2) "ayah"
3) "age"
4) "27"
5) "country"
6) "jordan"
7) "job description"
8) "backend develper"
127.0.0.1:6379> HGETALL user:2
1) "name"
2) "sham"
3) "age"
4) "24"
5) "country"
6) "jordan"
7) "job description"
8) "backend develper"
127.0.0.1:6379> HGETALL user:3
1) "name"
2) "nour"
3) "age"
4) "22"
5) "country"
6) "jordan"
7) "job description"
8) "backend develper"

HDEL​

The HDEL command is used to delete one or more fields from a hash.

HDEL key field [field ...]
  • key: The name of the hash key.
  • field: The name of the field(s) to delete from the hash.

Example:

127.0.0.1:6379> hdel user:3 country "job description"
(integer) 2
127.0.0.1:6379> HGETALL user:3
1) "name"
2) "nour"
3) "age"
4) "22"
127.0.0.1:6379> hdel user:3 country "job description"
(integer) 0

HKEYS​

the HKEYS command is used to retrieve all the field names (keys) of a hash.

Here's the syntax:

HKEYS key
  • key: The name of the hash key.

This command returns a list of all field names (keys) associated with the specified hash.

Example:

127.0.0.1:6379> hkeys user:1
1) "name"
2) "age"
3) "country"
4) "job description"
127.0.0.1:6379> hkeys user:3
1) "name"
2) "age"

HSCAN​

the HSCAN command is used to incrementally iterate over the fields and values of a hash data structure.

Here's the syntax:

HSCAN key cursor [MATCH pattern] [COUNT count]
  • key: The name of the hash key.
  • cursor: An integer used to iterate over the hash. Initially, this should be set to 0.
  • MATCH pattern (optional): A pattern to match field names against.
  • COUNT count (optional): The number of elements to return in a single iteration (default is 10).

The HSCAN command returns a cursor and an array of field-value pairs. The cursor is used for subsequent iterations until it returns 0, indicating the end of the iteration.

HSCAN user:id:1001 0

Example:

127.0.0.1:6379> HSCAN user:1 0 MATCH *r* COUNT 1
1) "0"
2) 1) "country"
   2) "jordan"
   3) "job description"
   4) "backend develper"
127.0.0.1:6379> HSCAN user:2 0 MATCH name
1) "0"
2) 1) "name"
   2) "sham"

The cursor returned is "0", indicating that there are no more elements to scan.