Common methods for Python Memcached

Common methods:

(1) Add Method:

Usage: Add (key, value)

Method Description: Added a new key-value pair to add a cached data to the Memcache server

Import Memcache

MC = Memcache. Client (' [IP segment] ', debug=true)???? #连接memcache

Mc.add (' K1 ', ' v1 ')

Print Mc.get (' K1 ')

Results:

V1

(2) Replace

Usage: replace (key, value)

Method Description: Replace the value of key (or reconfigure the value of key)

Mc.replace (' K1 ', ' hello ')

Print Mc.get (' K1 ')

Results:

Hello

(3) Set

Usage: Set (key, value)

Method Description: The Set method is used to set the cache content of a specified key, and the Set method is the aggregate of the Add method and the Replace method.

Mc.set (' K2 ', ' v2 ')

Print Mc.get (' K2 ')

Results:

V2

Attention:

① if the key to be set does not exist, the set method has the same effect as the Add method;

② if the key you want to set already exists, the Set method works the same as the Replace method.

Summarize the differences between set and add:

Set = add + Replace

If this key value exists, add will error, set will not error, will be re-assigned, and overwritten.

(4) Set_multi, Get_multi

Description: Set_multi (dict)? Set multiple key:value at once

Get_multi (list) gets multiple keys at a time, and each key is passed as a parameter in the form of a list, and the return type is a dictionary.

Mc.set_multi ({"k100": "V100", "k101": "v101", "k102": "v102"})

Print? (Mc.get_multi (["K100", "k101", "k102"])

Results:

{"K100": "V100", "k101": "v101", "k102": "v102"}

(5) Delete

Description

Mc.set_multi ({"Test1": "V1", "test2": "V2", "Test3", "V3"})

Mc.delete ("Test1")

Mc.delete (["Test2", "test3"])

Results:

return empty Dictionary {}

(6) Append and prepend

Mc.append ("Test1", "Ling")

Print (Mc.get ("Test1"))

Return:

V1Ling

Description: Appends data to the original value and merges it into one data

Mc.prepend ("Test2", "Hello")

Print (Mc.get ("Test2"))

Return:

Hellov2

Description: Adds data before the original value, merging into one data

(7) INCR and DECR (self-increment and self-reduction)

Mc.set ("shop", +)???? # Set Key,value value

MC.INCR ("Shop")????????????? # Default self-increment 1

Print (Mc.get ("Shop"))

MC.INCR ("shop", +)???????? # Manually increment by 100, the second parameter specifies the amount of increment.

Print (Mc.get ("Shop"))

Results:

1001

1101

MC.DECR ("Shop")???????????? # Default Auto minus 1

Print (Mc.get ("Shop"))

MC.DECR ("Shop", "$")???? # manually subtract 500, the second parameter specifies the amount of reduction.

Print (Mc.get ("Shop"))

Results:

1100

600

Common methods for Python Memcached