12/29/2023 0 Comments Mysql uuid give random symbol![]() UUIDs are also typically displayed in lowercase, which to be honest is a bit unique for hex encoding. Including the four hyphens, it comes to a total of 36 characters. The sections are broken in the form 8-4-4-4-12. ![]() Best to avoid that confusion.Ī UUID is made up of 32 hex (base-16) digits, displayed in five sections. They could think it’s an encoded JWT, or perhaps a private key. Aside from the fact that there are safe libraries you can use to work with standard UUIDs, it’s nice to look at the UUID format and know “hey, this is an ID”! If you roll your own format, you’ll likely confuse members of your team. ![]() ![]() While you could just generate 32 random digits and call your home-grown ID format “good enough”, it’s nice to use standards that already exist. That said, in modern web development, I think we’d be penny-wise and dollar-stupid to care about such negligible resource usage. In systems where resources are precious, it could make sense to use a more compact format. UUIDs take up 128 bits in memory and can take up more if stored as a string. You have to have a bit of custom code that generates a specific format of the string, and you need to ensure that you have enough entropy in your system to ensure uniqueness. Making a UUID is slightly more complicated than just incrementing an integer Let’s quickly go over each possible explanation. □ Why are UUIDs only recently gaining popularity?Īll I can do is guess, but I have a couple of candidate hypotheses. I’m open to the possibility that universally unique IDs could create issues in a system’s architecture, I’ve just never experienced it, and I can’t think of why it would be problematic. In some systems, this would be almost impossible, especially without introducing some bugs.īy using UUIDs (or another kind of universally unique ID) we can save ourselves all this headache. Let’s say we acquire a new company and that company has its own user database and they have done the same thing using integers for their user IDs, so now we have a system where a single user ID can potentially point to two different records! To fix the problem, we would have to create a new list of IDs and painstakingly go through each data store in our architecture and update the IDs. If we need a list of posts, we look in the “users” database to see what information we have about the author. Well, we need to store a user ID, so we just start storing the user’s ID in that separate database as a kind of foreign key. For example, there may be a separate database that stores social media posts and we need to know which user made the posts. That may be fine for a while, but now imagine that we introduce more services into our backend architecture. So the first user will have the ID “1”, the next will be “2”, and so on. Each user has a primary key, and like many databases, that primary key is just an integer. One of the tables in that database is the “users” table. Let’s pretend we have a web application with a single database. Let’s take a real-world example and analyze why using UUIDs can make our lives easier. UUIDs used by completely unrelated companies or organizations can be referenced together without duplication. The main advantage of using UUIDs is that you can create a UUID and use it to identify something, such as a row in a database, with near certainty that the identifier will not exist in another row in your system or anyone else’s. On v, my platform for developers who want to learn back-end engineering, I use UUIDs as the primary key for all database records. It reduces the chances of future ID conflicts and makes building a distributed architecture much easier. In short, if you don’t have extremely strict memory and performance requirements, I’d recommend using UUIDs instead of integer IDs. No other ID in existence should be the same as yours. By using UUIDs, you ensure that your ID is not just unique in the context of a single database table, but is unique in the universe. A universally unique identifier (UUID) is a 128-bit format for creating IDs in code that has become popular in recent years, especially when it comes to database keys. If the site is a social media platform, then each post will also have a unique ID. For example, each user on a website will its own ID. In the context of back-end web development, an ID is just a unique identifier for a record of data.
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