UUID
Description
The uuid() function is used to generate a unique identifier (UUID) that conforms to the UUIDv4 standard. UUID (Universally Unique Identifier) is a standard used in computer systems to ensure global uniqueness. UUIDv4 is generated based on random or pseudo-random numbers, so each call to this function will produce a different result.
Syntax
Parameters
None
Return Result
Returns a string type UUID.
Usage Example
- Generate a UUID and display the result:
result
- Used to generate a new associated UUID when updating records:
This will generate a new related_id for the record in the example_table table with the specified existing_id.
Notes
- UUIDv4 is generated based on random numbers, so it has a high degree of uniqueness, but in some cases, there is still an extremely low probability of duplication.
- The generation of UUIDs may be affected by the quality of the system's random number generator, so it is important to ensure the security and reliability of the system's random number generator during use.
By using the uuid() function, you can easily generate unique identifiers in database operations, ensuring the uniqueness and consistency of the data.