guid

How does one change the PK column of the AspNetUser table from a guid to int data type? This should now be possible with the latest asp.net-identity version which got released today. But I can't find anywhere how this is done? James Skimming By default the ASP.NET Identity (using Entity Framework) uses strings as the primary keys, not GUIDs, but it does store GUIDs in those string. You need to define a few more classes, I've just created a new project (I'm using the VS2013 Update 2 CTP), here are the identity models you need to change: public class ApplicationUser : IdentityUser<int,

I'm having difficulties manually debugging an .NET application where the Guid values differ from .NET to Oracle. Where C# reads: 17D89D326C2142D69B989F5201288DBF Oracle reads: 329DD817216CD6429B989F5201288DBF How would I be able to manually debug, i.e., from C#'s GUID be able to paste that value in an oracle query and get the correct results (and viceversa)? If you look at the values involved (in pairs) of hex digits you can see that the last 7 bytes are the same in both cases, but the first 9 are switched around a bit. Going from your example, but rewriting each pair in the .NET as 00, 11, 22

What is the best way to programmatically generate a GUID or UUID in C++ without relying on a platform-specific tool? I am trying to make unique identifiers for objects in a simulation, but can't rely on Microsoft's implementation as the project is cross-platform. Notes: Since this is for a simulator, I don't really need cryptographic randomness. It would be best if this is a 32 bit number. Anonymous If you can afford to use Boost, then there is a UUID library that should do the trick. It's very straightforward to use - check the documentation and this answer . on linux: man uuid on win: check

I have a table that will have millions of entries, and a column that has BIGINT(20) values that are unique to each row. They are not the primary key, but during certain operations, there are thousands of SELECT s using this column in the WHERE clause. Q: Would adding an index to this column help when the amount of entries grows to the millions? I know it would for a text value, but I'm unfamiliar with what an index would do for INT or BIGINT . A sample SELECT that would happen thousands of times is similar to this: `SELECT * FROM table1 WHERE my_big_number=19287319283784 If you have a very

4 用SMTP　发送会议邀请 public ServiceWrapper SendInvitation(MMeetingInvitation model) { Log.WriteMsg($ " OldModel:{new JavaScriptSerializer().Serialize(model)} " ); var sw = new ServiceWrapper( " SendMeetingInvitation " ); InvitationMail im = new InvitationMail(); try { if (! string .IsNullOrEmpty(model.content)) model.content = model.content.Replace( " \\n " , " \n " ); if (! string .IsNullOrEmpty(model.attendees)) model.attendees = model.attendees.Replace( " , " , " ; " ); string attendees; attendees = string .Join( " ; " , (model.organizer + " ; " + model.attendees).Split( ' ; ' ).Where(s => {

I'm working on a web service which requires a new GUID() passed as a reference to a method within the service. I am not familiar with C# or the GUID() object , but require something similar for PHP (so create a new object which from my understanding returns an empty/blank GUID ). Any ideas? You can try the following: function GUID() { if (function_exists('com_create_guid') === true) { return trim(com_create_guid(), '{}'); } return sprintf('%04X%04X-%04X-%04X-%04X-%04X%04X%04X', mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(16384, 20479), mt_rand(32768, 49151), mt_rand(0,

The standard string representation of GUID takes about 36 characters. Which is very nice, but also really wasteful. I am wondering, how to encode it in the shortest possible way using all the ASCII characters in the range 33-127. The naive implementation produces 22 characters, simply because 128 bits / 6 bits yields 22. Huffman encoding is my second best, the only question is how to choose the codes.... The encoding must be lossless, of course. Use Base 85. See section 4.1. Why 85? of A Compact Representation of IPv6 Addresses An IPv6 address, like a GUID is made up of eight 16-bit pieces.