How to write data to redis cache

To write data to the Redis cache, you need to connect to the server, use the SET command to set key-value pairs, and can store complex structures. Supports setting expiration time, and provides NX and XX options to handle conflicts. At the same time, you can also use the MSET command to write key-value pairs in batches.

How to write data in the Redis cache

Redis is a key-value storage database that allows users Store data in memory for fast access. To write data to the Redis cache, you can use the following steps:

1. Connect to the Redis server

Connect to the Redis server using the Redis client library or command line tools . In the command line, you can execute the following command:

<code>redis-cli</code>

2. Set key-value pair

To write data to the Redis cache, you need to use the SET command. The syntax of this command is as follows:

<code>SET key value</code>

Where:

• key: the key to be set
• value: the value associated with the key

For example, to set the key "name" to the value "John Doe", you can execute the following command:

<code>SET name John Doe</code>

3. Store complex structures

Redis is not only String values ​​can be stored, as well as complex structures such as hashes, lists, and sets.

• Hash: Use the HSET command to store key-value pairs in a hash.
• List: Use the LPUSH or RPUSH command to append elements to the beginning or end of the list.
• Collections: Use the SADD command to add members to a collection.

4. Set expiration time

Redis allows users to set expiration time for key-value pairs. Use the EXPIRE command to specify the number of seconds after which a key will expire. For example:

<code>EXPIRE name 3600</code>

This will cause the key "name" to expire after 1 hour.

5. Handling conflicts

If you try to set a different value associated with an existing key, Redis will overwrite the existing value. To handle conflicts, you can use the following strategy:

• NX: Only set the value if the key does not exist.
• XX: Only update the value if the key exists.

Use the NX or XX options in the command to prevent data loss or accidental overwriting.

6. Batch writing

To write multiple key-value pairs at one time, you can use the MSET command. The syntax of this command is as follows:

<code>MSET key1 value1 key2 value2 ...</code>

This will set multiple key-value pairs at the same time.

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