Read the values ​​corresponding to all keys in redis

Get the values ​​corresponding to all keys from Redis through the following methods: KEYS command: Returns an array of all keys matching the specified pattern. SCAN command: Iterate over the key collection and return key-value pairs in batches until all keys are returned.

How to get the values ​​corresponding to all keys from Redis

Get the values ​​corresponding to all keys from Redis Two methods:

1. Use the KEYS command

KEYS The command returns all keys matching the given pattern in the form of an array:

<code>KEYS pattern</code>

For example, to get all keys prefixed with "user:", you can use the following command:

<code>KEYS user:*</code>

2. Use the SCAN command

SCAN The command iterates over the keys in the Redis database, returning one batch at a time:

<code>SCAN cursor [MATCH pattern] [COUNT count]</code>

where:

• cursor is the last scan The cursor, the initial value is 0
• pattern is the key pattern to be matched; if it is empty, all keys will be matched
• count specifies each The number of keys returned in each batch; the default is 10

Use the SCAN command to obtain the values ​​corresponding to all keys as follows:

<code>while True:
    cursor, keys = redis_client.scan(cursor=cursor, count=100)
    for key in keys:
        value = redis_client.get(key)
    if cursor == 0:
        break</code>

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