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Basic memcached Operations

The interface to memcached supports the following methods for storing and retrieving information in the

cache, and these are consistent across all the different APls, although the language specific mechanics might be different:

• get (key): Retrieves information from the cache. Returns the value associated with the key if the

specified key exists. Returns NULL, nil, undefined, or the closest equivalent in the corresponding

language, if the specified key does not exist.

• set (key, , value, [, expiry]): Sets the item associated with a key in the cache to the

specified value. Notę that this either updates an existing item if the key already exists, or adds a new

keyA/alue pair if the key doesn‘texist. If the expiry time is specified, then the item expires (and is

deleted) when the expiry time is reached. The time is specified in seconds, and is taken as a relative

time if the value is less than 30 days (30*24*60*60), or an absolute time (epoch) if

larger than this

value.

• add [key, , value, [, expiry]): Adds the key and associated value to the cache, if the

specified key does not already exist.

• replace (key, , value, [, expiry]): Replaces the item associated with the specified key,

only if the key already exists. The new value is given by the value parameter.

• delete(key, (, time)): Deletes the key and its associated item from the cache. If you supply a

time, then adding another item with the specified key is blocked for the specified period.