guid

I want to try to convert a string to a Guid, but I don't want to rely on catching exceptions ( for performance reasons - exceptions are expensive for usability reasons - the debugger pops up for design reasons - the expected is not exceptional In other words the code: public static Boolean TryStrToGuid(String s, out Guid value) { try { value = new Guid(s); return true; } catch (FormatException) { value = Guid.Empty; return false; } } is not suitable. I would try using RegEx, but since the guid can be parenthesis wrapped, brace wrapped, none wrapped, makes it hard. Additionally, I thought

I know this may sounds like a pointless question, but hear me out... I basically want to know if I can trust the GUID to generate a value which will be unique 100% of the time and impossible to predict. I'm basically rolling my on login system for a website and want to know if the GUID is secure enough for session cookies. Any background on how the GUID is generated would be much appreciated in evaluating the answers. Thanks for the links to duplicate questions, however, my question is specific to the .Net framework. John Sheehan Here's an excellent breakdown by Raymond Chen No fixed-length

How to check if variable contains valid UUID/GUID identifier ? I'm currently interested only in validating types 1 and 4, but it's not limit for your answer. Gambol Currently, UUID's are as specified in RFC4122. Therefore to validate a UUID... /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i ...ensures you have a canonically formatted UUID that is Version 1 through 5 and is the appropriate Variant as per RFC4122. NOTE: Braces { and } are not canonical. They are an artifact of some systems and usages. Easy to modify the above regex to meet the requirements of the

I'm working on a database in SQL Server 2000 that uses a GUID for each user that uses the app it's tied to. Somehow, two users ended up with the same GUID. I know that microsoft uses an algorithm to generate a random GUID that has an extremely low chance of causing collisons, but is a collision still possible? Tom Ritter 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

What are some of the best ways to create a GUID in Java? Mark Byers Have a look at the UUID class bundled with Java 5 and later. For example: If you want a random UUID you can use the randomUUID method. If you want a UUID initialized to a specific value you can use the UUID constructor or the fromString method. java.util.UUID.randomUUID(); It depends what kind of UUID you want. The standard Java UUID class generates Version 4 (random) UUIDs. ( UPDATE - Version 3 (name) UUIDs can also be generated.) It can also handle other variants, though it cannot generate them. (In this case, "handle" means

Do I use varchar(36) or are there any better ways to do it? 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 it. That being said... You can store a guid as a CHAR(16) binary if you want to make the most optimal use of storage space. I would store it as a char(36). KCD Adding to the answer by ThaBadDawg, use these handy functions (thanks to a wiser collegue of mine) to get from 36 length string

I see these 2 acronyms thrown around, and I was wondering if there are any differences between a GUID and a UUID? Hoylen The simple answer is: no difference , they are the same thing. Treat them as a 16 byte (128 bits) value that is used as a unique value. In Microsoft-speak they are called GUIDs, but call them UUIDs when not using Microsoft-speak. Even the authors of the UUID specification and Microsoft claim they are synonyms: From the introduction to IETF RFC 4122 " A Universally Unique IDentifier (UUID) URN Namespace ": "a Uniform Resource Name namespace for UUIDs (Universally Unique

0. SharePoint 2013使用_api来标识出 REST SERVICE，REST Service其实是 client.svc web service的一部分，但为了简化 REST URI的构造以及缩短REST URI的长度，使用 _api 来替代 _vti_bin/client.svc，例如, 你可以使用 http://server/site/_vti_bin/client.svc/web/lists 来替代 http://server/site/_api/web/lists；然而URL有256字符长度的限制，所以建议使用 _api 惯例；可参考 此文章 中的 Reference the SharePoint 2013 REST service in your endpoint URI 章节； SharePoint 2013 REST Syntax Posters.pdf 工具：Chrome浏览器中的 Advanced Rest Client Application插件 1. Search REST API的query(GET)可以设置 返回json格式的结果，存储在data.d.query.PrimaryQueryResult.RelevantResults.Table.Rows.results中，results是个数据集合，序号从0开始； 2. 使用REST