uniqueidentifier

问题 What is the best way to generate a unique ID in java. People generally use String id = System.currentTimeMillis+ someStaticCounter; But this approach would require synchronization in multithreaded applications. I am using try { Thread.sleep(1); //This sleep ensures that two consecutive calls from the same thread does not return the same id. } catch (InterruptedException e) { // do nothing; } id = System.currentTimeMillis() + "-" + Thread.currentThread().getId(); This approach helps me from

问题 The OUTPUT clause is compatible with SQL Server 2005 but not SQL Server 2000. How do I convert this command to work in SQL Server 2000? CREATE TABLE sample ( ID uniqueidentifier NOT NULL DEFAULT newid(), Title varchar(30) NOT NULL ) INSERT INTO sample (Title) OUTPUT INSERTED.ID VALUES ('Test1') I need the command to retrieve the ID since the INSERT command needs to be called from a stored procedure. Thanks for any help! 回答1: DECLARE @uid uniqueidentifier SET @uid = newid() INSERT INTO sample

问题 Disclaimer : This is for a semester project that I am currently working on. My question is regarding an implementation level detail and is not part of the grading scheme. I am only writing this code as a way to test the theory that I am proposing for the paper that I will write. Also, I have considered the answers for this question with little luck, so please do not consider this as a duplicate of that question The Problem : I have a graph (G=(V,E)). At some point in my algorithm, I need to

问题 This question already has answers here : UIDevice uniqueIdentifier deprecated - What to do now? (32 answers) iOS unique user identifier [duplicate] (7 answers) Closed 5 years ago . First of all, I'd like to say that I'm fully aware that uniqueIdentifier has been deprecated and there are identifierForVendor & advertisingIdentifier . My question is, if there is a way to have a fully persistent device identifier which lives through anything like reboots, app uninstalls, etc. Currently we use

问题 The title is my question actually. Now that Apple doesnt allow any more the use of UUID i decided to go with the CFUUID. However i have some questions regarding it. Is is unique for every device? If yes how is it different from UUID? Is it a random generator? If yes how good is it? Can i be sure that in 10000 devices there wont be a duplicate? I am between in this solution of using CFUUID , and having my server generating a random unique identifier that i can be sure of. However this would

问题 I would like to create a tool that checks if I already have a local clone of a remote repository before cloning said repository. To do this, I need a way of testing if B is the same as repository A -- by which I guess i mean they have mergeable histories. B might be named differently than A, and might have additional branches -- the usual use cases. Is there a way to do this? I have a tentative idea how to do it, but I thought perhaps someone here has a definitive answer. Tentative idea Get a

问题 what's the equivalent of this function in javascript: http://php.net/manual/en/function.uniqid.php Basically I need to generate a random ID that looks like: a4245f54345 and starts with a alphabetic character (so I can use it as a CSS id) 回答1: Try this (Work in php). $prefix = chr(rand(97,121)); $uniqid = $prefix.uniqid(); // $uniqid = uniqid($prefix); Try this for JavaScript:: var n = Math.floor(Math.random() * 11); var k = Math.floor(Math.random() * 1000000); var m = String.fromCharCode(n) +

问题 I am trying to activate APNS. Because uniqueIdentifier is deprecated, I'm trying to use CFUUIDCreate with the following code: UIDevice *dev = [UIDevice currentDevice]; NSString *deviceUuid; if ([dev respondsToSelector:@selector(uniqueIdentifier)]) deviceUuid = dev.uniqueIdentifier; else { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; id uuid = [defaults objectForKey:@"deviceUuid"]; if (uuid) deviceUuid = (NSString *)uuid; else { CFStringRef cfUuid = CFUUIDCreateString(NULL

问题 I am trying to read information off of a smartcard, using a contact-less OmniKey 5321 card reader. Edit : Added a bounty. I'm writing a C# 3 in .NET 3.5 program, so this is a Windows application. The card has some information stamped onto it, that I would assume, in some way, is present in the card data (there is a photo of the card and reader below.) The card has the following information stamped onto it: 1* 00447 21091328-32 When using the Diagnostics application that comes with the OmniKey

问题 I have a directive that can be used multiple times on a page. In the template of this directive, I need to use IDs for an input-Element so I can "bind" a Label to it like so: <input type="checkbox" id="item1" /><label for="item1">open</label> Now the problem is, as soon as my directive is included multiple times, the ID "item1" is not unique anymore and the label doesn't work correctly (it should check/uncheck the checkbox when clicked). How is this problem fixed? Is there a way to assign a