Python memcache Common operations

• Add () Adds a key value pair, and if key already exists, repeating the add operation will report an exception

  mc.add(‘name2‘, ‘lisi‘)print(mc.get(‘name2‘))# lisi

• Replace modifies the value of a key, and if key does not exist, the report is abnormal

  # mc.add(‘name‘,‘wangwu‘)    # 添加个已存在key ，发生异常# MemCached: while expecting ‘STORED‘, got unexpected response ‘NOT_STORED‘

• Set () sets a key-value pair, if key does not exist, is created, exists, then modified

  mc.set(‘name2‘, ‘zhaoliu‘)print(mc.get(‘name2‘))# zhaoliu

The difference between add () and set ():

• Add () Adds a data to the memcache to be cached, and the call fails when key is present
• Set () sets the cache contents of a specified key, there is a change in key, there is no creation, set () is the collection of Add () and replace ()

mport memcachemc = memcache.Client([‘11.11.11.11:12000‘], debug=True)mc.add(‘name2‘, ‘lisi‘)print(mc.get(‘name2‘))# lisi# mc.add(‘name‘,‘wangwu‘)    # 添加个已存在key ，发生异常# MemCached: while expecting ‘STORED‘, got unexpected response ‘NOT_STORED‘mc.set(‘name2‘, ‘zhaoliu‘)print(mc.get(‘name2‘))# zhaoliu##### C:\Python27\python.exe D:/Python/memcache/memcache2.py# lisi# zhaoliu## Process finished with exit code

• Set_muilt () sets multiple key-value pairs, key exists, modifies, does not exist, creates a key-value pair to be passed in as a dictionary

  mc.set_multi({‘key1‘:‘v100‘, ‘key2‘:‘v200‘, ‘key3‘:‘v300‘, ‘key4‘:‘v400‘, ‘key5‘:‘v500‘})

• Get () Gets the value of a key

• Get_muilt () Gets the value of more than one key, and multiple keys are passed in list mode, returning a Dictionary object

  print(mc.get(‘key5‘))print(mc.get_multi([‘key1‘, ‘key2‘, ‘key3‘, ‘key4‘, ‘key5‘]))# v500# {‘key3‘: ‘v300‘, ‘key2‘: ‘v200‘, ‘key1‘: ‘v100‘, ‘key5‘: ‘v500‘, ‘key4‘: ‘v400‘}

• Delete () Deletes a specified key-value pair

• Delete_muild () Deletes a specified number of key values to multiple keys in list mode

  mc.delete("key1")print(mc.get(‘key1‘))# Nonemc.delete_multi([‘key2‘, ‘key3‘, ‘key4‘])print(mc.get_multi([‘key1‘, ‘key2‘, ‘key3‘, ‘key4‘, ‘key5‘]))# {‘key5‘: ‘v500‘}

• Append () modifies the value of the specified key, appending the content after the value

• Prepend () modifies the value of the specified key to insert the contents before the value

  mc.add(‘test‘,‘hello‘)print(mc.get(‘test‘))# hellomc.append(‘test‘, ‘world‘)print(mc.get(‘test‘))# helloworldmc.prepend(‘test‘, ‘hi,‘)print(mc.get(‘test‘))# hi,helloworld

• INCR (key[, n]) increments the value of a key by n (n default = 1)

  mc.add(‘num‘, ‘1101‘)mc.incr(‘num‘)print(mc.get(‘num‘))mc.incr(‘num‘,100)print(mc.get(‘num‘)

• DECR (key[, n]) decrement, the value of one key is reduced by N (n default is 1)

  mc.set(‘num‘, ‘1000‘)mc.decr(‘num‘)print(mc.get(‘num‘))# 999mc.decr(‘num‘,100)print(mc.get(‘num‘))# 899

Python memcache Common operations