uuid

[ object, uuid(AECE8D0C-F902-4311-A374-ED3A0EBB6B49), dual, nonextensible, pointer_default(unique) ] interface ICallbacks : IUnknown { [id(1)] HRESULT UserExit([in] int errorCode, [in] BSTR errorMessage); [id(2)] HRESULT UserAttemptingReconnection(); [id(3)] HRESULT UserReconnected(); }; [ object, uuid(B98A7D3F-651A-49BE-9744-2B1D8C896E9E), dual, nonextensible, pointer_default(unique) ] interface ICerberusSession : IDispatch { ... [id(5)] HRESULT SetCallbacks([in] ICallbacks* callbacks); }; 来源： https://www.cnblogs.com/nanfei/p/11423184.html

I want to generate GUID strings in VBScript. I know that there's no built-in function in VBScript for generating one. I don't want to use random-generated GUIDs. Maybe there is an ActiveX object that can be created using CreateObject() that is sure to be installed on (newer) Windows versions that can generate a GUID? Roger Lipscombe How Can I Create a GUID Using a Script? (in: Hey, Scripting Guy! Blog) says this: Set TypeLib = CreateObject("Scriptlet.TypeLib") Wscript.Echo TypeLib.Guid However, note that Scriptlet.TypeLib.Guid returns a null-terminated string, which can cause some things to

I'm working on a distributed data base. I'm trying to generate a unique ID that will serve as a column family primary key in cassandra . I read some articles about doing this with Java using UUID but it seems like there is a probability for collision (even if it's very low). I wonder if there is a way to generate a unique ID based on time maybe? Richard You can use the TimeUUID type in Cassandra, which backs a Type 1 UUID . This uses the current time and the creator's MAC address and a sequence number. If the TimeUUID number is generated correctly this can be done with zero collisions (you can

I am looking for an efficient way to store and search UUID in Core Data. Those UUID are generated by many iOS devices in a distributed system. Each of those devices may store about 20-50k UUIDs. It is obvious that storing UUID as String in Core Data will hurt the efficiency of indexing on it. But after a series of research I found that storing UUID as Binary Data in Core Data (and index it) may be less efficient than storing it as String . As there is no BINARY-like or VARBINARY-like data type in SQLit is supported. I guess that any Binary Data type of data in Core Data is stored as BLOB in

Is there a way to define a column (primary key) as a UUID in SQLAlchemy if using PostgreSQL (Postgres)? JDiMatteo The sqlalchemy postgres dialect supports UUID columns. This is easy (and the question is specifically postgres) -- I don't understand why the other answers are all so complicated. Here is an example: from sqlalchemy.dialects.postgresql import UUID from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() class Foo(db.Model): id = Column(Integer, primary_key=True) uuid = Column(UUID(as_uuid=True), unique=True, nullable=False) I wrote this and the domain is gone but here's the guts..

I've always preferred to use long integers as primary keys in databases, for simplicity and (assumed) speed. But when using a REST or Rails-like URL scheme for object instances, I'd then end up with URLs like this: http://example.com/user/783 And then the assumption is that there are also users with IDs of 782, 781, ..., 2, and 1. Assuming that the web app in question is secure enough to prevent people entering other numbers to view other users without authorization, a simple sequentially-assigned surrogate key also "leaks" the total number of instances (older than this one), in this case