UnitOfWork | Work Abstraction For NHibernate Or Entity Framework C | SQL Database library
kandi X-RAY | UnitOfWork Summary
kandi X-RAY | UnitOfWork Summary
Unit Of Work For NHibernate and Entity Framework C# Example, as per article: If you would like to test it out, just create eCommerce database and run "Customer table.sql". Then just use SQL Server trace tools and look at the transaction control.
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UnitOfWork Examples and Code Snippets
Lines of Code : 18License : Non-SPDX
Copy@Override
public void commit() {
if (context == null || context.size() == 0) {
return;
}
LOGGER.info("Commit started");
if (context.containsKey(UnitActions.INSERT.getActionValue())) {
commitInsert();
}
if (conte Community Discussions
Trending Discussions on UnitOfWork
QUESTION
I am using the Unit of Work patterns and want to a value back from the database to make sure it has updated the database successfully. Is there a way to do that?
...ANSWER
Answered 2021-Jun-15 at 13:25When you call SubmitChanges(), a transaction is created.
All objects that have pending changes are ordered into a sequence of objects based on the dependencies between them. Objects whose changes depend on other objects are sequenced after their dependencies.
Immediately before any actual changes are transmitted, LINQ to SQL starts a transaction to encapsulate the series of individual commands.
Using the default conflict resolution mode (FailOnFirstConflict), the entirety of your changes fail to save when an error is occurred because the transaction encapsulating all your changes is rolled back.
That means that if your submission succeeds, you can be sure your unit of work was completed. You do not need to get a value back to determine whether or not your changes were saved.
You could also set the conflict resolution mode to ContinueOnConflict if you have changes that you know do not depend on each other and you want all changes to be attempted even if one or more fail.
QUESTION
I using CleanArchitecture solution. I have Data layer where ApplicationDbContext and UnitOfWork are located :
...ANSWER
Answered 2021-Jun-13 at 12:31finally, I found my answers in this article https://snede.net/you-dont-need-a-idesigntimedbcontextfactory/
Create ApplicationDbContextFactory in Portal.Data project:
QUESTION
So
Console:
...ANSWER
Answered 2021-Apr-22 at 20:32I have had the same issue. This is what I did:
- I deleted the
migrationsfolder as well as thedistfolder - I ran
npx mikro-orm migration:create --initial
After that, I restarted yarn watch and yarn dev and it worked for me.
Notice the --initial flag. I would recommend to check the official documentation. The migrations table is used to keep track of already executed migrations. When you only run npx mikro-orm migration:create, the table will not be created and therefore MikroORM is unable to check if the migration for the Post entity has already been performed (which includes creating the respective table on the database).
Ben does not use the --initial flag in his tutorial, he might have already ran it prior to the tutorial.
QUESTION
trying to execute a select with Oracle.ManagedDataAcces.Client (ODP.NET) with a C# .NET 5 web app.
Oracle.ManagedDataAcces.Client version is latest 3.21.1 as of 02/06/2021.
The error:
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware1 An unhandled exception has occurred while executing the request. Oracle.ManagedDataAccess.Client.OracleException (0x80004005): ORA-01841: (full) year must be between -4713 and +9999, and not be 0 at OracleInternal.ServiceObjects.OracleConnectionImpl.VerifyExecution(Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, SqlStatementType sqlStatementType, Int32 arrayBindCount, OracleException& exceptionForArrayBindDML, Boolean& hasMoreRowsInDB, Boolean bFirstIterationDone)
This is the query code
...ANSWER
Answered 2021-Jun-02 at 10:06Better use
QUESTION
I need to call a few stored procedures (data inserts) plus update an entity value to the database.
I want these operations to be atomic, so if an error occurs, they all rollback.
In my code, if I force an exception to observe the behavior of the rollback, my entity changes are rolling back, but my stored procedure changes do not get rolled back.
Looking at the implementation for unit of work, it's just looking at _context.ChangeTracker.Entries() - I assume completely ignoring any stored procedure changes?
When I change the unit of work implementation to use
...ANSWER
Answered 2021-May-27 at 21:18Well yes - the Change Tracker of course can only track whatever you've changing / modifying / adding through means of the DbContext class.
Running a stored procedure is outside the scope of the EF Change Tracker - so if you base your "rollback" on simply things in the Change Tracker, you won't be able to properly handle anything your stored procedure have done.
Using TransactionScope is fundamentally different - this is an "umbrella" over all the database operations - including any stored procedures being executed - since it's basically on the database's level. So rolling back based on the transaction scope will roll back all database operations - whether handled via the EF DbContext, or via other means.
QUESTION
I've a problem with my UOW pattern implementation ( my UOW uses Repository Pattern ). Im gonna try to explain my project structure with two simple calsses. I've Person and Car, (one to many - one to one).
...ANSWER
Answered 2021-May-24 at 15:36Since you are using a unit of work, the easiest way would be to add a new method to PersonRepository
QUESTION
I have a website Angular frontend and WebAPI on the backend with all my controllers, I also have a service (C# class) that I call as a singleton as a long running task to listen for incoming Azure service bus messages.
FYI - I can't pass any scoped services (DbContext) to a singleton (ServiceBusConsumer), so I can't pass in my DB context to this service.
QUESTION - Once I receive an incoming service bus message, how do I call up my DB and use it?
Here is my service listening for and receiving messages.
Startup.cs
...ANSWER
Answered 2021-May-22 at 19:19It seems your problem is with DI.
Your ServiceBusConsumer service is a singleton but you inject a DbContext as a constructor. This is generally the recommendation but in this case, it can't work.
You inject a DbContext in the constructor and "save" a "link" to it. But then it gets disposed, so that "link" won't work.
Instead, you should inject a DbContextFactory. With a factory, you can create DbContext instances on demand.
QUESTION
Long story short.
I use Doctrine's Single Table Inheritance mapping to map three different contexts (classes) of the one common entity: NotActivatedCustomer, DeletedCustomer, and Customer. Also, there is an AbstractCustomer which contains the next:
...ANSWER
Answered 2021-May-21 at 21:28I think you're absolutely right to want to avoid Customer turning into a god object. Inheritance is one way to do it, but using it for customers in different statuses can lead to problems.
The two key problems in my experience:
- As new statuses emerge, will you keep adding different inherited entities?
- What happens when you have a customer move through two different statuses, such as a customer that was a
NotActivatedCustomerbut is now aDeletedCustomer?
So I keep inheritance only when the inherited type is genuinely more specific type, where a given entity will only ever be one of those types for its entire lifecycle. Cars don't become motorbikes, for example.
I have two patterns for solving the problem differently to you. I tend to start with the first and move to the second.
QUESTION
I have implemented Unit Of Work and facing following the error, earlier the project implemented well when I just implemented Repository. This is the error I'm getting in my Browser (Google Chrome Version 90.0.4430.212 (Official Build) (64-bit)):
Server Error in '/' Application.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[MissingMethodException: No parameterless constructor defined for this object.] System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +122 System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +239 System.Activator.CreateInstance(Type type, Boolean nonPublic) +85 System.Activator.CreateInstance(Type type) +12 System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +55
[InvalidOperationException: An error occurred when trying to create a controller of type 'OfficeWork.Controllers.PopulationsController'. Make sure that the controller has a parameterless public constructor.] System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +178 System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +80 System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +102 System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +188 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +50 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +105 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +163
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4330.0
"IUnitOfWork" interface:
...ANSWER
Answered 2021-May-20 at 07:18The main issue was "dependency injection".
QUESTION
I am trying to get the cookie after a successful login but I cant figure out how. On the ASP Net Core Identity API using swagger the browser gets the cookie but when I use the fetch api I cant get the cookie. I tried returning the return response.json(); but this does not work. I also have the redirecting to home page on login Success but Iam not sure exactly how to return the return response.json(); if that is needed.
Both the Identity api and the JS - Cleint are running on localhost.
JS - Fetch API - POST:
...ANSWER
Answered 2021-May-09 at 09:14You're calling fetch() from a different origin than the api, right? If so, this sounds like a simple CORS issue.
By default, CORS does not include credentials such as cookies. You have to opt in by both setting the credentials mode on the client side, and the Access-Control-Allow-Credentials header on the server side.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials
With the fetch() api, the credentials mode is set with the credentials: 'include' option. As far as the server side, I'm not familiar with ASP but it sounds like it provides some conveniency method to set the relevant header.
As you hint at in your post, when the Access-Control-Allow-Credentials header is set to true, the * value - meaning any origin - actually can’t be used in the Access-Control-Allow-Origin header, so you will have to be explicit about what origin you want allowed - ie the origin of your client application, the origin being defined as the combination of the protocol, domain, and port.
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