![]() If you want to build a serious App I would recommend you to have a look at Twitter’s Snowflake. However a much better approach in order to avoid collisions would be having a dedicated server generating all the UUIDs. This is just a quick way for generating UUIDs. INSERT INTO Users (id, user) VALUES (UNHEX(REPLACE(UUID(),'-','')), 'Jimmy') UNHEX(): We use this function to finally convert the hex characters into a 16bytes key (128bits). REPLACE(): We use this function to get rid of all dashes within the key. UUID(): Generates the 36 characters hexadecimal key. Now we just need to create the UUIDs on the fly using the following functions: Here are just a few examples: Storing UUID and Generated Columns Storing UUID Values in MySQL Illustrating Primary Key models in InnoDB and their impact on disk usage MySQL UUID Smackdown: UUID vs. Let’s make a example of how a binary UUID can be easily created in MySQL or MariaDB. NovemYves Trudeau If you do a quick web search about UUIDs and MySQL, you’ll get a fair number of results. So it can be stored in a BINARY(16) column. It’s a bit ugly right? So we are going to convert it into a nice compact and faster 16-byte key. However the string generated is a bit unfriendly, something like this: 584da03d-18d7-4701-9808-eec48f65e797 This generates a 36 characters hexadecimal key (with 4 dashes included). UUID v4 : is a universally unique identifier that is generated using random numbers. UUID v1 : is a universally unique identifier that is generated using a timestamp and the MAC address of the computer on which it was generated. Note that the MySQL UUID () function generates timestamp based UUID. ![]() Using UUID in MySQL/MariaDBĬreating an UUID is as easy as using the function UUID(). MySQL generates UUID v1 as described in RFC4122. The Universal Unique Identifier (UUID) in MySQL is a string of 16 bytes that. ![]() The reason why is because they are unique across every table, every database and every server, allowing easy merging of records from different databases and easy distribution of databases across multiple servers. The idea is using them as primary keys rather than the default integers with the AUTO_INCREMENT flag. Many professionals recommend using UUID ( Universally Unique Identifiers) also known as GUID ( Globally Unique Identifier). ![]()
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