MGET
is a command in Redis that allows you to retrieve multiple keys in a single operation, which can be useful when you need to fetch many values simultaneously, improving the efficiency over separate GET
operations.
Example 1: Basic usage of MGET
with Node.js and redis package.
const redis = require('redis'); const client = redis.createClient(); client.mget(['key1', 'key2', 'key3'], function(err, reply) { console.log(reply); // Prints an array of values for 'key1', 'key2', and 'key3' });
In this example, we create a Redis client and use the mget
method to get the values of 'key1', 'key2', and 'key3'. The result is an array containing the value of each key.
Example 2: Handling missing keys.
const redis = require('redis'); const client = redis.createClient(); client.mget(['missingKey', 'anotherMissingKey'], function(err, reply) { console.log(reply); // Prints: [ null, null ] });
In this example, if a key doesn't exist in the Redis store, mget
returns null
for that key.
MGET
over individual GET
commands when you need to retrieve multiple keys at once. It reduces network latency and improves performance.null
values in the result array. MGET
returns null
for keys that do not exist.Q: Can I mix existing and non-existing keys while using MGET?
A: Yes, MGET
will return an array with the values of existing keys and null
for non-existing keys.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.