Advantages: Can generate them offline. Makes replication trivial (as opposed to int’s, which makes it REALLY hard) ORM’s usually like them Unique across applications. So We can use the PK’s from our CMS (guid) in our app (also guid) and know we are NEVER going to get a clash. Disadvantages: Larger space use, but space … Read more
Use the static method Guid.NewGuid() instead of calling the default constructor. var responseObject = proxy.CallService(new RequestObject { Data = “misc. data”, Guid = Guid.NewGuid() });
Try this one: let uuid = NSUUID().uuidString print(uuid) Swift 3/4/5 let uuid = UUID().uuidString print(uuid)
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Currently, UUID’s are as specified in RFC4122. An often neglected edge case is the NIL UUID, noted here. The following regex takes this into account and will return a match for a NIL UUID. See below for a UUID which only accepts non-NIL UUIDs. Both of these solutions are for versions 1 to 5 (see … Read more
new Guid() makes an “empty” all-0 guid (00000000-0000-0000-0000-000000000000 is not very useful). Guid.NewGuid() makes an actual guid with a unique value, what you probably want.
GUIDs may seem to be a natural choice for your primary key – and if you really must, you could probably argue to use it for the PRIMARY KEY of the table. What I’d strongly recommend not to do is use the GUID column as the clustering key, which SQL Server does by default, unless … Read more
java.util.UUID.randomUUID();
It depends on how you format the Guid: Guid.NewGuid().ToString() = 36 characters (Hyphenated) outputs: 12345678-1234-1234-1234-123456789abc Guid.NewGuid().ToString(“D”) = 36 characters (Hyphenated, same as ToString()) outputs: 12345678-1234-1234-1234-123456789abc Guid.NewGuid().ToString(“N”) = 32 characters (Digits only) outputs: 12345678123412341234123456789abc Guid.NewGuid().ToString(“B”) = 38 characters (Braces) outputs: {12345678-1234-1234-1234-123456789abc} Guid.NewGuid().ToString(“P”) = 38 characters (Parentheses) outputs: (12345678-1234-1234-1234-123456789abc) Guid.NewGuid().ToString(“X”) = 68 characters (Hexadecimal) outputs: {0x12345678,0x1234,0x1234,{0x12,0x34,0x12,0x34,0x56,0x78,0x9a,0xbc}}
Guid id = Guid.NewGuid();