identity

问题 From Operators.id<'T> Function (F#): The identity function. Parameters: x Type: 'T (The input value) Return Value: The same value F# Core Library Versions, supported in: 2.0, 4.0, Portable Why is there a function that returns its input? 回答1: When working with higher-order functions (i.e. functions that return other functions and/or take other functions as parameters), you always have to provide something as parameter, but there isn't always an actual data transformation that you'd want to

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . It would seem to me that many large enterprises already have robust directory services such as Active Directory and it would be silly to constantly duplicate users in an application-specific store. Even if you require duplicating the user store, you can provide a mechanism to

问题 [continued from Is there a way to tell whether two COM interface references point at the same instance?] I've got references to Inspector objects from two different sources and need to be able to tell which item from one source corresponds to which item from the other source. However, none of the approaches I have been able to come up with so far worked (reliably): I couldn't simply compare the IUnknown interfaces as it seems that the Inspectors.Item() method is returning a reference to a

问题 In SQL Server 2008 R2 I know how to create a primary key column that keeps my lines unique (column3 in my example below), but I also need a column that auto-fills a repeating set of integers (column2 in my example below). I don't know how to create a column like this. Searches suggest it can be done with "reseeding", but not sure how to actually a create this column or if its even possible to automatically do this. I'm looking for something like this, with Column2 being auto-filled every time

问题 Say I want to develop a site with some CMS embedded in it - e.g., a Wordpress blog and phpbb forum. What's the most convenient way to unify the log-in and sign-up process for my site? Letting users have a different registration process for each part of the site would probably scare any sane user away. EDIT I prefer generic solutions, not necessarily for the aforementioned CMSs. 回答1: Both Wordpress and phpBB3 have OpenID authentication plugins -- you could use OpenID for both. 回答2: This might

问题 I've got a table which has a column named id which is of type Identity . But this column contains duplicate values 1..8 and then again 1..10 How in the world is this possible? 回答1: I tested what Giogri says and if you enable the Identity Specification (at least on 2008, probably other versions, too) after the table has rows, the DB will start the numbering at the highest integer value. If you have one row with 100 as the column value, then enable Identity, the next insert will be 101. Even

问题 I have a distributed application that sends and receives data from a specific service on the Internet. When a node receives data, sometimes it needs to validate that that data is correlated with data it or another node previously sent. The value also needs to be unique enough so that I can practically expect never to generate identical values within 24 hours. In the current implementation I have been using a custom header containing a value of uuid.uuid1() . I can easily validate that that

问题 I have this project where I am using Identity Server 4 and Web API. The Web API is protected by the ID server project. As I understood, it is a better practice to have the ID server sit in its own project and have its own database. However, I am not sure how user registration should happen.I have my username and password sitting in the ID Server and the rest of the user details (fname, lname, dob, etc...) sittin in my main database. So how should the registration take place? I thought maybe

问题 I wonder if someone ran into the issue that I am having with trying to move ApplicationUser into Models project (where all other models reside including the ones related to Users table). My test MVC 5 solution consists of a web project and two class libraries: one for data access layer (DAL) and the other for Models. I references AspNet.Identity.EntityFramework in all three projects. In my DAL class I implement Repository pattern and a UnitOfWork. UnitOfWork extends IdentityDbContext

问题 I was wondering how can I add an identity column to existing oracle table? I am using oracle 11g. Suppose I have a table named DEGREE and I am going to add an identity column to that. FYI table is not empty. 回答1: You can not do it in one step. Instead, Alter the table and add the column (without primary key constraint) ALTER TABLE DEGREE ADD (Ident NUMBER(10)); Fill the new column with data which will fulfill the primary key constraint (unique/not null), e.g. like UPDATE DEGREE SET Ident