Redis Hash: HINCRBYFLOAT

Redis HINCRBYFLOAT command

Redis HINCRBYFLOAT command is used to increment the specified field of a hash stored at key, and representing a floating point number, by the specified increment. If the field does not exist, it is set to 0 before performing the operation. If the field contains a value of wrong type or specified increment is not parsable as floating point number, then an error has occurred.

Here are some common uses and scenarios for the "HINCRBYFLOAT" command:

• Increment Counters: Update floating-point counters stored in a hash for precise tracking.
• Financial Calculations: Adjust monetary values or prices within a hash.
• Score Keeping: Increment floating-point scores or points for users or items.
• Atomic Operations: Ensure atomicity when incrementing floating-point values in hash fields in a multi-client environment.
• Dynamic Data Updates: Efficiently update numeric values within a hash without retrieving and modifying the entire hash.

Syntax:

HINCRBYFLOAT KEY_NAME FIELD_NAME INCR_BY_NUMBER  

Available since

2.6.0.

Return Value

String reply, the value of field after the increment.

Return Value Type

Integer

Example: Redis HINCRBYFLOAT

127.0.0.1:6379> HSET langhash lang1 10.25
(integer) 1
127.0.0.1:6379> HINCRBYFLOAT langhash lang1 0.2
"10.45"
127.0.0.1:6379> HSET langhash lang1 6.0e4
(integer) 1
127.0.0.1:6379> HINCRBYFLOAT langhash lang1 3.0e3
"63000"

Example: Redis HINCRBYFLOAT another example

127.0.0.1:6379> HINCRBYFLOAT user height 85.5
"85.5"
127.0.0.1:6379> HINCRBYFLOAT user height 14.2
"99.7"
127.0.0.1:6379> HINCRBYFLOAT user height -12.5
"87.2"
127.0.0.1:6379> HINCRBYFLOAT user height 85.5
"172.7"
127.0.0.1:6379> HINCRBYFLOAT user height -85.7
"87"

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