Redis 3.2.4 Command entry Supplements

Redis 3.2 string type entry

3.2.4 Command Supplements

1. Increase the integer specified

INCRBY key increment

  INCRBY command INCR command basically the same, but the former can specify a numerical increase by increment parameters.

2. diminishing specified integer

DECR key
DECRBY key

  DECR INCR command with the same usage, just let the key diminishing.

3. Increase the specified float

INCRBYFLOAT key increment

  INCRBYFLOAT key increment command similar INCRBY command, the difference is that the former can be a double-precision floating-point increments

4. aft added value

APPEND key value

  APPEND key role is to append a value. If the key does not exist then the set key-value is value, which is equivalent to SET key value. The return value is the total length of the string after appended.

5. Get string length

STRLEN key

  STRLEN command returns the length of the key, if the key does not exist is returned to zero.

6. Meanwhile Get / Set plurality of keys

MGET key [key...]
MGET key value [key value...]

  MGET / MSET the GET / SET similar, but MGET / MSET can get / set a plurality of keys of the key simultaneously. Such as:

redis> MSET key1 value1 key2 value2 key3 value3
OK
redis> GET key2
"value2"
redis> MGET key1 key3
1) "value1"
2) "value3"

7. Bit Operation

GETBIT key offset
SETBIT kye offset value
BITCOUNT key [start] [end]
BITOP operation destkey key [key...]