uuid

问题 When I use below to get the user object it works just fine. @GetMapping("/findOne") @ResponseBody public Optional<AppUser> findOne (Long id) { return appUserRepository.findById(id); } Above gives me a response back as: {"id":1,"useruuid":"863db606-9af6-48a8-963a-07b9fe0fc4fc","useremail":"user1@mydomain.com"} Now, I am trying to search based on UUID(4) using this: @GetMapping("/findOneUsingUUID") @ResponseBody public AppUser findOne (String useruuid) { return appUserRepository.findByUseruuid

问题 After reading this blog post https://blog.starkandwayne.com/2015/05/23/uuid-primary-keys-in-postgresql/ I wanted to know more about how Django generates uuid because I am using them as my pk. Well, according to the docs, https://docs.djangoproject.com/es/1.9/ref/models/fields/#uuidfield, Django is relying on the Python UUID module https://docs.python.org/3/library/uuid.html#uuid.UUID. But there are many kinds of UUID, and it is not at all clear to me which one is being generated in Django, or

问题 If I have two UUIDs, is there a "safe" method to generate a third composite UUID. That is to some statistical definition of the word unique. So I'm looking for function f below in UUID generatedUUID = f(UUID a, UUID b) XOR? 回答1: Depending on where you're getting the two UUIDs from, UUID V3/V5 may be applicable, and any decent library should have functions to generate those. Even if they're not quite right logically, you may be able to abuse them for that purpose anyway. You'd have to explain

问题 We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length. Does anyone know a suitable max char length for UUID?? 回答1: Section 3 of RFC4122 provides the formal definition of UUID string representations. It's 36 characters (32 hex digits + 4 dashes). Sounds like you need to figure out where the

问题 I have an android device acting as server which connects to multiple bluetooth android clients. I understand the concept of UUID and how it is unique. My question is, can I use the same UUID for all my clients connecting to my server? If not, how do I generate a UUID for my clients programmatically and let my server know about their UUIDs. The problem started appearing after Android 8.1 where you no longer had access to bluetooth MAC address which I initially used to generate UUIDs for client

问题 I have an android device acting as server which connects to multiple bluetooth android clients. I understand the concept of UUID and how it is unique. My question is, can I use the same UUID for all my clients connecting to my server? If not, how do I generate a UUID for my clients programmatically and let my server know about their UUIDs. The problem started appearing after Android 8.1 where you no longer had access to bluetooth MAC address which I initially used to generate UUIDs for client

问题 The reason for this question is: We are planning to have a UUID as a partition key for an id of a user, company, and load tables for a load board project and we are using DynamoDB. The thing is when we have thousands of records in a DynamoDB supposedly a user table and I want to search a user with their user-id. Will the search be more efficient with UUID(ff44393c-bec6-4005-a966-15050fd9bb77) or normal Interger id like (001,002.....)?as partition key. I could also see that UUID format is a

问题 The reason for this question is: We are planning to have a UUID as a partition key for an id of a user, company, and load tables for a load board project and we are using DynamoDB. The thing is when we have thousands of records in a DynamoDB supposedly a user table and I want to search a user with their user-id. Will the search be more efficient with UUID(ff44393c-bec6-4005-a966-15050fd9bb77) or normal Interger id like (001,002.....)?as partition key. I could also see that UUID format is a

来源： https://stackoverflow.com/questions/63412258/laravel-7-using-as-uuid-foreign-key

来源： https://stackoverflow.com/questions/63412258/laravel-7-using-as-uuid-foreign-key