How redis gets data

Redis provides the following ways to obtain data: GET: Get the value of the specified key. MGET: Get the values ​​of multiple keys at the same time. HGET: Get the value of the specified field in the hash table. HGETALL: Get the values ​​of all fields in the hash table. LINDEX: Gets the element at the specified index in the list. LRANGE: Get the elements in the specified range in the list.

How Redis obtains data

Redis provides multiple ways to obtain stored data, the most commonly used method As follows:

1. GET

The GET command is the simplest method to obtain the value of the specified key. Syntax:

<code>GET key</code>

For example:

<code>GET username</code>

2. MGET

The MGET command is used to obtain the values ​​of multiple keys at the same time. Syntax:

<code>MGET key1 key2 ... keyN</code>

For example:

<code>MGET username email age</code>

3. HGET

The HGET command is used to obtain the value of the specified field in the hash table. Syntax:

<code>HGET key field</code>

For example:

<code>HGET user:1 username</code>

4. HGETALL

The HGETALL command is used to get the values ​​of all fields in the hash table. Syntax:

<code>HGETALL key</code>

For example:

<code>HGETALL user:1</code>

5. LINDEX

The LINDEX command is used to get the element at the specified index in the list. Syntax:

<code>LINDEX key index</code>

For example:

<code>LINDEX list:1 0</code>

6. LRANGE

The LRANGE command is used to obtain elements within the specified range in the list. Syntax:

<code>LRANGE key start end</code>

For example:

<code>LRANGE list:1 0 2</code>

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