uuid v4

UUID and guid UUID is a string generated after the 32-byte string is separated by four hyphens (-), with a total length of 36 bytes. For example: 550e8400-e29b-41d4-a716-446655440000 Http://gohands.blogbus.com/logs/147479174.html GUID is

Rails 4 can be used to support the postgres of the UUID (universally unique Identifier, the unique identifier) type in the original ecosystem. Here, I'll describe how you can use it to generate a UUID without manually modifying any rails code.

improved V3 by using two referenced arrays to provide UUID for element nodes, and the other two arrays to provide cache bodies. Delete the data class in V4. There is only one array to provide the uuid for the element node, and then an array to

v I. PrefaceThese days in the study QR Code of the scan code login. There are a lot of things I don't understand. On the internet to see someone wrote some through QRCode or zxing realize the generation and decoding of two-dimensional code. On a

NFS Protocol NFS (Network File system) is not a file system in the traditional sense, but rather a network protocol that accesses a remote file system. As shown in the TCP/IP protocol stack for the entire NFS service, NFS is the application layer

Typically a database can generate a unique ID, most of which is a sequence of numbers, or a combination of sequences like MongoDB, but this form of ID is predictable because it is a sequence. If you want an unpredictable and unique ID, there are

"The authoritative Guide to Android Programming"-Reading notes (11) Perfecting CriminalintentIn the previous article, we followed the author of the book, using a single fragment for the simplest insert operation. This article will follow the author

Opening:Checked the document for two days, error 38 times, and finally simply remove all the additional conditions,Not even the interface, in the command line run through a lump of the most withered upload flow!Still braving the heat ...Make a

We'll learn how to use Store.subscribe () to efficiently persist some of the app's state to localstorage and restore it a Fter a refresh.To save data on to Localstroge, we first create a Localstorgejs file and both methods, one for get and one for

Cat/dev/urandom | Lc_all=c TR-DC "[: Alnum:]" | Fold-w |head-10 Si1n9kuyuzDdzsrxfgxaCadrbrt4pxBugk6lkx4dN5xod1toyr1645cBxAjlKrjwjr2txuNhQedXagL9RradezgfhyQxcurm5ezf Parameter description: If you need a particularly complex password, try