Redis provides a variety of data reading methods, including: GET (single key value reading), MGET (batch key value reading), HGET (hash table key value reading), HGETALL (hash table key value reading) Read all key values of the Greek table), LRANGE (read list range data), ZRANGE (read ordered set range members), ZRANGEBYSCORE (read ordered set score range members). The data read by these methods are all in binary format and need to be converted according to the data type. Non-existing keys return nil.
Redis reading data method
Redis is a popular key-value database that provides efficient and convenient Data storage and retrieval capabilities. There are several methods to read data in Redis:
1. GET
The most basic data reading method, used to obtain the value of the specified key. The syntax is as follows:
<code>GET <key></code>
2. MGET
Get the values of multiple keys at one time. The syntax is as follows:
<code>MGET <key1> <key2> ... <keyN></code>
3. HGET
Get the value of the specified key from the hash table. The syntax is as follows:
<code>HGET <hash> <field></code>
4. HGETALL
Get all key-value pairs in the hash table. The syntax is as follows:
<code>HGETALL <hash></code>
5. LRANGE
Get the data within the list range. The syntax is as follows:
<code>LRANGE <list> <start> <stop></code>
6. ZRANGE
Get the members in the specified range in the ordered set. The syntax is as follows:
<code>ZRANGE <zset> <start> <stop></code>
7. ZRANGEBYSCORE
Get the members within the specified score range in the ordered set. The syntax is as follows:
<code>ZRANGEBYSCORE <zset> <min> <max></code>
When reading data, you need to pay attention to the following points:
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