Redis Hash

How to get a value of the field contained in hash – Redis HGET | HMGET

5 years ago Lalit Bhagtani 0

In this tutorial, we will learn about how to get the value associated with a field contained in the hash value stored at a key. For this, we will use Redis HGET and HMGET command.

HGET Command

This command is used to get the value associated with a specified field contained inside the hash value stored at a specified key. If the key does not exist or if a key exists but hash value does not contain the specified field, nil is returned and if the key exists but value stored at the key is not of a hash datatype, an error is returned. The syntax of the Redis HGET command is as follows:-

Syntax :-

redis host:post> HGET <keyname> <field>

Output :- 

- (string) reply, representing a value of the field.
- (nil), if a hash value does not contain the field or if key does not exist.
- Error, if key exist and value stored at the key is not a hash.

Example :-

Redis HGET

HMGET Command

This command is used to get the values associated with one or more specified fields contained inside the hash value stored at a specified key. For every specified field that does not exist inside the hash value, a nil value is returned.

If the key does not exist, a list of nil values are returned and if the key exists but value stored at the key is not of a hash datatype, an error is returned. 

The syntax of the Redis HMGET command is as follows:-

Syntax :-

redis host:post> HMGET <keyname> <field> [ field ]

Output :- 

- (array) reply, representing the list of field values in the hash.
- (nil), if key does not exists.
- Error, if key exist and value stored at the key is not a hash.

Example :-

Redis HMGET

References :-

  1. HGET Command Docs
  2. HMGET Command Docs

That’s all for how to get the value associated with a field contained in the hash value stored in redis datastore. If you liked it, please share your thoughts in comments section and share it with others too.

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