In Python, retrieving multiple values from Redis is a common operation when you have to process or analyze a group of related data elements at once. This can be particularly useful in applications that need to fetch user profiles, configuration settings, session information, or other groups of related data.
Example 1: Retrieve multiple keys using mget()
Here's how to use the
mget() function in Redis-py:
In this code, we first establish a connection with the Redis server. Then we define a list of keys for which we want to retrieve the values. The
mget() function retrieves the values associated with each key in the list.
Example 2: Handle non-existent keys with mget()
It's important to note that
mget() will return None for any key that does not exist:
Here, 'key4' and 'key5' do not exist in the Redis database, so
mget() returns None for these keys.
Nonein the result list after calling
mget(), as it signifies that the corresponding key did not exist in the Redis database.
mget()instead of multiple
get()calls to reduce network latency and improve application performance.
mget()can lead to unexpected behavior or errors.
Q: What does
mget() return if a key doesn't exist in the database?
mget() will return None for any key that does not exist in the Redis database.