Appending data to an existing key in memcached can be useful when you want to add more information to the value of a key without overwriting the existing data. This is common in scenarios like logging actions, collaboration tools, or when processing incremental data.
Let's use python-memcached module which is a pure python memcached client.
To append data, first, we will set a key-value pair and then append data:
Here, we first connect to the memcached server running at localhost on port 11211. We then set the value "Hello" for the key "sample_key". Finally, we append ", World" to the same key. When we fetch that key again, the output reflects the appended data.
getmethod to ensure the key is present.
Q: Can I prepend data as well in memcached?
A: Yes, the
prepend operation can be used to add data to the beginning of an existing key's value.
Q: What happens if I attempt to append to a non-existing key? A: Attempting to append to a non-existing key will simply do nothing. It won't create a new key.