identity

问题 Is there any way to preserve the identity of a pickled object, i.e. have the below print True : import pickle class Foo: pass x = Foo() print(x is pickle.loads(pickle.dumps(x))) #False I am using cPickle and cpython 3.x on a Linux box, don't need something that's portable. 回答1: yes, it is possible; You'll need to include the "identity" in the pickled result some how; the most natural being to use __getnewargs__ and have a __new__ method return the existing, cached instance in that case.

问题 According to the REST philosophy, a PUT request should update the resource at a URL if it exists, and create it if it doesn't exist. So in other words, if I use the following URL: PUT http://server/item/5 If an Item exists with an ID of 5, it will be updated. If an Item doesn't exist with an ID of 5, a new Item will be created with an ID of 5. However, I'm using NHibernate for persistence, and I mapped my IDs as Identity . This means that no matter what value I assign the ID, NHibernate will

问题 In SymPy, what is the difference between eye(5) and Identity(5) ? If I have a matrix X , I see that X + eye(5) and X + Identity(5) give different results (the latter is not a matrix). 回答1: SymPy distinguishes between explicit matrices , which have certain size, like 3 by 3, and explicit (possibly symbolic) entries; matrix expressions , which may have symbolic size, like n by n. eye creates a matrix, Identity creates a matrix expression. For example: n = Symbol("n") A = Identity(n) # works A =

问题 Here is a minimal repro example. Database: CREATE TABLE temp (x int IDENTITY(1, 1), y int); Code (using VBA and ADO): Public Sub repro() Dim cn As New Connection Dim rs1 As New Recordset Dim cmd As New Command Dim rs2 As New Recordset cn.Open "Provider=SQLNCLI11;Server=myServer;Database=myDatabase;Trusted_Connection=Yes" rs1.Open "SELECT 1", cn, adOpenForwardOnly ' [X] ' cmd.ActiveConnection = cn cmd.CommandText = "INSERT INTO temp (y) VALUES (1) " cmd.Execute rs2.Open "SELECT @@IDENTITY", cn

问题 Sybase 12.5 I have an existing table in production that needs it's PK int column to be altered such that it is auto populated - when the table was created it would ideally have had the ID column created as an Identity. This ID column is a foreign key in multiple other tables so deleting the table and starting again isn't an option. Problem is, I can't set the PK as an IDENTITY, and creating a temp column with the current values and copying these to a new IDENTITY column is also failing. As

问题 I've looked around to try and find an answer to my specific question. I'm basically using an external library to check if a user is authorized within our domain via username and password. var authenticatedUser = ECNSecurity.SecurityChecker.AuthenticateUser(model.Username, model.Password); Returns true or false whether the user is or is not. I'd like to be able to use the [Authorize] attribute on some of my controller methods. Is this possible to do this without using Identity? Or would I need

问题 I want to understand the NumPy behavior. When I try to get the reference of an inner array of a NumPy array, and then compare it to the object itself, I get as returned value False . Here is the example: In [198]: x = np.array([[1,2,3], [4,5,6]]) In [201]: x0 = x[0] In [202]: x0 is x[0] Out[202]: False While on the other hand, with Python native objects, the returned is True . In [205]: c = [[1,2,3],[1]] In [206]: c0 = c[0] In [207]: c0 is c[0] Out[207]: True My question, is that the intended

问题 I'm implementing Asp.NET MVC application with Identity 2.x Authentication and Authorization model. During LogIn process I add Custom Claims (not persisted in the DB!), deriving from data passed in the LogIn from, to the Identity and I can correctly access them later on, until the identity gets regenerated. [HttpPost] [AllowAnonymous] [ValidateHeaderAntiForgeryToken] [ActionName("LogIn")] public async Task<JsonResult> Login(LoginViewModel model, string returnUrl) { if (!ModelState.IsValid)

问题 How can I set a Microsoft SQL field as identity but to START with a certain number? 回答1: Take a look at this msdn post, the value from which you want to start your identity is called seed. If you want to do it from the GUI, then you can select that column and in its properties, in the identity specification section look of the IsIdentity and set it to true, then look for Identity Seed and specify the value which ever you want, you can also specify the increment as well. 回答2: In SQL Server,

问题 How can I set a Microsoft SQL field as identity but to START with a certain number? 回答1: Take a look at this msdn post, the value from which you want to start your identity is called seed. If you want to do it from the GUI, then you can select that column and in its properties, in the identity specification section look of the IsIdentity and set it to true, then look for Identity Seed and specify the value which ever you want, you can also specify the increment as well. 回答2: In SQL Server,