How to get data in redis

Common ways to obtain data in Redis are: GET: directly obtain the value of the specified key. MGET: Get the values ​​of multiple keys at the same time and return a list. HGET: Get the value of the specified field in the hash table. HMGET: Get the values ​​of multiple fields in the hash table and return a list. LRANGE: Get the elements in the specified range in the list. ZRANGE: Gets elements within a specified range in an ordered collection. ZREVRANGE: Get the elements in the specified range in the ordered set, sorted from large to small.

How to obtain data in Redis

There are usually several ways to obtain data in Redis:

1. GET

The simplest way to obtain, directly obtain the value of the specified key.

<code>GET key</code>

2. MGET

can get the values ​​of multiple keys at the same time and return a list.

<code>MGET key1 key2 key3</code>

3. HGET

Get the value of the specified field in the hash table.

<code>HGET hash_key field</code>

4. HMGET

Get the values ​​of multiple fields in the hash table and return a list.

<code>HMGET hash_key field1 field2 field3</code>

5. LRANGE

Get the elements in the specified range in the list.

<code>LRANGE list_key start end</code>

6. ZRANGE

Get the elements within the specified range in the ordered set.

<code>ZRANGE sorted_set_key start end</code>

7. ZREVRANGE

Get the elements in the specified range in the ordered set, sorted from large to small.

<code>ZREVRANGE sorted_set_key start end</code>

Note:

• GET, HGET, LRANGE, ZRANGE, ZREVRANGE will return nil if the key does not exist.
• If the key exists but the type does not match, GET and HGET will throw an error.
• MGET, HMGET will return a list containing nil values.

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