Redis Incrbyfloat Command

Redis string

The Redis Incrbyfloat command adds the specified floating-point increment value to the value stored at key.

If the key does not exist, INCRBYFLOAT will first set the value of the key to 0, and then perform the addition operation.

Syntax

The basic syntax of the redis Incrbyfloat command is as follows:

redis 127.0.0.1:6379> INCRBYFLOAT KEY_NAME INCR_AMOUNT

Available versions

>= 2.6.0

Return value

The value of key after the command is executed.

Examples

# 值和增量都不是指数符号

redis> SET mykey 10.50
OK

redis> INCRBYFLOAT mykey 0.1
"10.6"


# 值和增量都是指数符号

redis> SET mykey 314e-2
OK

redis> GET mykey                # 用 SET 设置的值可以是指数符号
"314e-2"

redis> INCRBYFLOAT mykey 0      # 但执行 INCRBYFLOAT 之后格式会被改成非指数符号
"3.14"


# 可以对整数类型执行

redis> SET mykey 3
OK

redis> INCRBYFLOAT mykey 1.1
"4.1"


# 后跟的 0 会被移除

redis> SET mykey 3.0
OK

redis> GET mykey                                    # SET 设置的值小数部分可以是 0
"3.0"

redis> INCRBYFLOAT mykey 1.000000000000000000000    # 但 INCRBYFLOAT 会将无用的 0 忽略掉，有需要的话，将浮点变为整数
"4"

redis> GET mykey
"4"

Redis string

Other extensions