UUID

  • UUIds (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier).
  • A UUID is 128 bits long, and can guarantee uniqueness across space and time.
  • You can use this where you need unique values for a field (say External ID, Name...)
  • Spec for UUId is here

Apex example

// using ApexUuid 
// https://github.com/jongpie/ApexUUID/blob/main/apex-uuid/classes/Uuid.cls 
String uuid = new Uuid().getValue();
System.debug(uuid);

String uuid = new Uuid().getValue();
System.debug(uuid);

Account acct = new Account();
acct.name = 'Green ' + uuid;
insert acct;

account with uuid name

  • Spring 24 release 
// in Spring 24 release
UUID randomUuid = UUID.randomUUID();
// Prints the UUID string that was randomly generated
system.debug(randomUuid);

Python example


## simple_uuid.py
import uuid

print (uuid.uuid1())
print (uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org'))
print (uuid.uuid4())
print (uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org'))
  • Running this :
python simple_uuid.py

e7bafaaa-bdc3-11ee-972e-acde48001122
6fa459ea-ee8a-3ca4-894e-db77e160355e
5b3418b4-d52e-458e-9ef5-a3279b476f97
886313e1-3b8a-5372-9b90-0c9aee199e5d
  • Python version ApexUuid is here 
// example.py
from Uuid4 import Uuid4

def example():
        try:
            # Create a new UUID instance
            uuid_instance = Uuid4()

            # Access the generated UUID
            uuid_value = uuid_instance.value
            print(f"Generated UUID: {uuid_value}")

            # Check if a UUID is valid
            is_valid = Uuid4.is_valid(uuid_value)
            print(f"Is Valid UUID: {is_valid}")

            # Format a UUID
            unformatted_uuid = "550e8400-e29b-41d4-a716-446655440000"
            formatted_uuid = Uuid4.format_value(unformatted_uuid)
            print(f"Formatted UUID: {formatted_uuid}")

            # Create a UUID instance from a string
            uuid_instance_from_string = Uuid4.value_of("550e8400-e29b-41d4-a716-446655440000")
            print(f"UUID from String: {uuid_instance_from_string.value}")

        except UuidException as e:
            print(f"UuidException: {e}")

if __name__ == "__main__":
    example()

python example.py

Generated UUID: 37cce53e-eb9e-4faf-8dcd-516fae0efafd
Is Valid UUID: True
Formatted UUID: 550e8400-e29b-41d4-a716-446655440000
UUID from String: 550e8400-e29b-41d4-a716-446655440000

Java version

  • Uses this for Uuid4 
// UuidExample.java
public class UuidExample {
    public static void main(String[] args) {
        try {
            // Create a new UUID instance
            Uuid4 uuidInstance = new Uuid4();

            // Access the generated UUID
            String uuidValue = uuidInstance.getValue();
            System.out.println("Generated UUID: " + uuidValue);

            // Check if a UUID is valid
            boolean isValid = Uuid4.isValid(uuidValue);
            System.out.println("Is Valid UUID: " + isValid);

            // Format a UUID
            String unformattedUuid = "550e8400-e29b-41d4-a716-446655440000";
            String formattedUuid = Uuid4.formatValue(unformattedUuid);
            System.out.println("Formatted UUID: " + formattedUuid);

            // Create a UUID instance from a string
            Uuid4 uuidInstanceFromString = Uuid4.valueOf("550e8400-e29b-41d4-a716-446655440000");
            System.out.println("UUID from String: " + uuidInstanceFromString.getValue());

        } catch (Uuid4.UuidException e) {
            System.out.println("UuidException: " + e.getMessage());
        }
    }
}
  • Usage
javac Uuid4.java UuidExample.java 

java UuidExample 
Generated UUID: 7972fe1e-6ebb-4c27-9901-f7a025de7408
Is Valid UUID: true
Formatted UUID: 550e8400-e29b-41d4-a716-446655440000
UUID from String: 550e8400-e29b-41d4-a716-446655440000

References