Yes, you can. Since GUIDs are 128 bits long, there is admittedly a minute possibility of a clash—but the word “minute” is nowhere near strong enough. There are so many GUIDs that if you generate several trillion of them randomly, you’re still more likely to get hit by a meteorite than to have even one … Read more
See if these helps :- Guid.Parse – Docs Guid guidResult = Guid.Parse(inputString) Guid.TryParse – Docs bool isValid = Guid.TryParse(inputString, out guidOutput)
Basically, no. I think someone went mucking with your database. Depending on the version GUID you’re using the value is either unique (for things like version 1 GUIDs), or both unique and unpredictable (for things like version 4 GUIDs). SQL Server’s implementation for their NEWID() function appears to use a 128-bit random number, so you’re … Read more
You can use these methods to get an empty guid. The result will be a guid with all it’s digits being 0’s – “00000000-0000-0000-0000-000000000000“. new Guid() default(Guid) Guid.Empty As Use Keim points out in the comments default is short for default(Guid)
As of Ruby 1.9, uuid generation is built-in. Use the SecureRandom.uuid function. For example: require ‘securerandom’ SecureRandom.uuid # => “96b0a57c-d9ae-453f-b56f-3b154eb10cda”
— Update — As of January 9th, 2015. the solution is now implemented in Rails 5 ActiveRecord’s secure token implementation. — Rails 4 & 3 — Just for future reference, creating safe random token and ensuring it’s uniqueness for the model (when using Ruby 1.9 and ActiveRecord): class ModelName < ActiveRecord::Base before_create :generate_token protected def … Read more
My DBA asked me when I asked about the best way to store GUIDs for my objects why I needed to store 16 bytes when I could do the same thing in 4 bytes with an Integer. Since he put that challenge out there to me I thought now was a good time to mention … Read more
I think I found the answer: convert(nvarchar(36), RequestID) Here’s the link where I found this info: http://msdn.microsoft.com/en-us/library/ms187928.aspx
Performance Benchmarks Catch exception: 10,000 good: 63,668 ticks 10,000 bad: 6,435,609 ticks Regex Pre-Screen: 10,000 good: 637,633 ticks 10,000 bad: 717,894 ticks COM Interop CLSIDFromString 10,000 good: 126,120 ticks 10,000 bad: 23,134 ticks COM Intertop (Fastest) Answer: /// <summary> /// Attempts to convert a string to a guid. /// </summary> /// <param name=”s”>The string to … Read more
[[UIDevice currentDevice] uniqueIdentifier] Returns the Unique ID of your iPhone. EDIT: -[UIDevice uniqueIdentifier] is now deprecated and apps are being rejected from the App Store for using it. The method below is now the preferred approach. If you need to create several UUID, just use this method (with ARC): + (NSString *)GetUUID { CFUUIDRef theUUID … Read more