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0Day Forums Coding Database What is the difference between HSET and HMSET method in redis database

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What is the difference between HSET and HMSET method in redis database

Offline kelcijosfe


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#1
07-20-2023, 05:27 AM
In my application im using redis database.I have gone through their documentation but i couldn't find the difference between HSET and HMSET.
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Offline trireme414


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#2
07-20-2023, 05:33 AM
**[HSET key field value][1]:**

Sets field in the hash stored at key to value. If key does not exist, a new key holding a hash is created. If field already exists in the hash, it is overwritten.


**[HMSET key field value \[field value ...\]][2]**

Sets the specified fields to their respective values in the hash stored at key. This command overwrites any existing fields in the hash. If key does not exist, a new key holding a hash is created.


For more redis commands information, [click here][3].


[1]:

[To see links please register here]

[2]:

[To see links please register here]

[3]:

[To see links please register here]

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Offline orchitis17387


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#3
07-20-2023, 05:53 AM
The only difference between the commands [`HSET`](

[To see links please register here]

) and [`HMSET`](

[To see links please register here]

) is the **return value** of the commands.

HSET return value (Integer reply):

- `#` if the field is a new field in the hash and value was set. (where `#` is the number of new fields created )
- 0 if the field already exists in the hash and the value was updated.

HMSET returns a simple string as a reply.

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Offline Siralmondlike859


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#4
07-20-2023, 05:55 AM
HSET used to be able to set only one key-value pair. And if you needed to set several at once, you would have to use HMSET (M for multi). That was changed a few years ago, to allow both commands to accept multiple pairs. And now HMSET is redundant.

From [official documentation](

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):

> As per Redis 4.0.0, HMSET is considered deprecated. Please use HSET in new code.

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