Redis data type operation (i)--string

1. Set

Format: Set ' key ' ' value '

Adds a string-type key-value pair.

2. Get

Format: Get ' key '

Gets the string type value value corresponding to key, and nil is returned if it is not found.

3. Mset

Format: Mset ' key1 ' value1 ' key2 ' value2 ' ...

Adds multiple string-type key-value pairs.

4. Mget

Format: Mget ' key1 ' key2 ' ...

Gets the string type value value corresponding to multiple keys and returns nil if not found.

5. Getset

Format: Getset ' key ' new value '

Get the old value corresponding to the key and set the new value.

6. SETNX (set not exist)

Format: Setnx ' key ' value '

Adds a string-type key-value pair. If the key already exists, neither add nor modify the original value, and return 0, or add if it does not exist, and return 1.

7. Msetnx

Format: Msetnx ' key1 ' value1 ' key2 ' value2 ' ...

Adds multiple string-type key-value pairs. If there is a key already present, do not add or modify the original value, and return 0 if none exists then add, and return 1.

8. Setex (set expire)

Format: Setex ' key ' {num} ' value '

Adds a string-type key-value pair that expires after num seconds.

9. SetRange

Format: SetRange ' key ' {num} ' new-value '

Replaces the value of the original string from the old-value {num} (subscript starting at 0). If value does not have the original string length, the remaining content after the original string is preserved.

Ten. GetRange

Format: GetRange ' key ' {NUM1} {num2}

Gets the {num1} to {num2} string of value.

One. Del

Format: Del ' key1 ' Key2 ' ...

Delete the Key-value key-value pair.

incr.

Format: incr ' key '

The value of key is increased by 1 and is automatically initialized to 0 if it does not exist.

Incrby.

Format: Incrby ' key ' ±{num}

The value of key is incremented by NUM, the key does not exist automatically initialized to 0, and if NUM is negative, it is reduced.

Decr.

Format: DECR ' key '

The value of key is reduced by 1 and is automatically initialized to 0 if it does not exist.

Decrby ' key ' ±num

Format: Decrby ' key ' ±{num}

The value of key is reduced by NUM, the key does not exist automatically initialized to 0, and if NUM is negative, it is incremented.

Append.

Format: Append ' key ' value '

Append value to key.

Strlen.

Format: strlen ' key '

Gets the length of the value of key.

This article is from the "Bronze Gong" blog, please be sure to keep this source http://jaeger.blog.51cto.com/11064196/1772234

Redis data type operation (i)--string