![]() ![]() If you're interested in previous discussions, look into #350 Store binary UUID in MySQL and #645 Add support for optimized binary UUID keys. It is designed in such a way that it generates a number which is unique globally according to space and time. The length can be any value from 0 to 255. The length of a CHAR column is fixed to the length that you declare when you create the table. For example, CHAR (30) can hold up to 30 characters. If it's important to you to store uuids in a natively uuid-ish way, switch to a data storage that supports it (postgresql comes to mind.) A UUID is a Universal Unique Identifier specified by RFC 4122 (It is a Universally Unique Identifier URN Namespace) and 128-bit long value. The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. The problem here is that mysql, 2019, still don't have an uuid data type. Of course, there are other ways) If you use integer, someone can loop through all profile pictures that you have. The varchar columns in the table are of variable length string that can hold either numeric or character or both. So, this suggestion would basically break existing non-mysql systems that has a proper uuid type, while forcing everyone into a binary format they need different sql functions to work with. Varchar in MySQL is a data type used for storing text whose length can have a maximum of 65535 characters. This function in MySQL is used to return a Universal Unique Identifier (UUID) generated according to RFC 4122, A Universally Unique Identifier (UUID) URN. If you always have a UUID for each row, you could store it as CHAR(36) and save 1 byte per row over VARCHAR(36). The only way to support this on databases without the proper data type is to store them as something that work identically which in this case becomes string values. This means that these databases support syntax like WHERE id = '33555c1f-2211-4a7d-9f66-35cf5413444e' natively, and you can copy/paste those queries around and they will continue to work since they are conforming to the sql standard. Many other databases has a proper uuid type, like postgresql has the uuid type, and SQL Server has a guid type. I think the recommended/best practices to storing uuid in rdbms is by using binary(16) sisve i think mysql encourage to store 128 bit data in binary, mysql have no support for ipv6 but it have function to convert ipv6 to binary and vice versa the same as with uuid, because mysql has function to convert binary to uuid so i think mysql recommend storing uuid in binary, no need for native data type if it can do the same just with. I often come across columns that are varchar (255), so presumably this is a convention of sorts. I would like to add another view this isn't as much as if Laravel knows how the column is persisted, but that it breaks compatibility with other systems, including existing raw/manual queries. 11 This question already has answers here : MySQL - varchar length and performance (2 answers) Closed 4 years ago. 3 min read MySQL does not have a native UUID type, so strings are often used instead, which come with large storage and performance costs. ![]()
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