STRLEN

Return the length of the string value stored in key.

When key does not store a string value, an error is returned.

Redis Native Command Syntax

STRLEN key

Parameter Description

• key: The key to get the length

Detailed Explanation

The STRLEN command is used to get the length of the string value stored in a specified key. For non-existent keys, the command returns 0.

Redisun Usage

In redisun, the STRLEN command is implemented through the StrlenCommand class and the strlen method in the Redisun class.

Basic Usage

Redisun redisun = Redisun.create(options -> {
  options.setAddress("redis://127.0.0.1:6379");
});

// Set a string value
redisun.set("mykey", "Hello World");

// Get string length
int length = redisun.strlen("mykey");
System.out.println("String length: " + length); // Output: 11

// Get length of non-existent key
length = redisun.strlen("nonexistent");
System.out.println("Non-existent key length: " + length); // Output: 0

// Asynchronous version
CompletableFuture<Integer> future = redisun.asyncStrlen("mykey");
future.thenAccept(len -> System.out.println("Async length: " + len));

Notes

1. For non-existent keys, return length 0
2. If key exists but is not of string type, an exception will be thrown
3. The length of an empty string is 0

References

• Redis STRLEN Command Official Documentation