c# - 数据库操作预计影响 1 行，但实际影响 0 行

Question

我试图在两个表中插入记录，但出现异常。您能帮我解决这个问题吗？

首先我尝试了下面的代码。

await _testRepository.InsertAsync(test);
await _xyzRepository.InsertAsync(xyz);

然后我尝试了这段代码，但没有任何效果。

try
{
   var test = new Test();

   using (var uow = _unitOfWorkManager.Begin(TransactionScopeOption.RequiresNew))
   {
      int? tenantId = _unitOfWorkManager.Current.GetTenantId();
      using (_unitOfWorkManager.Current.SetTenantId(tenantId))
      {
         await _testRepository.InsertAsync(test);

         var xyz = new XYZ();
         await _xyzRepository.InsertAsync(xyz);
         await _unitOfWorkManager.Current.SaveChangesAsync();
         await uow.CompleteAsync();
      }
   }
}
catch (Exception ex)
{
   throw new UserFriendlyException(ex.Message);
}

异常

消息:

Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded. See http://go.microsoft.com/fwlink/?LinkId=527962 for information on understanding and handling optimistic concurrency exceptions.

堆栈跟踪:

at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.ThrowAggregateUpdateConcurrencyException(Int32 commandIndex, Int32 expectedRowsAffected, Int32 rowsAffected) at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.d__4.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.d__2.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.d__32.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.d__7`2.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.d__61.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.d__59.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.EntityFrameworkCore.DbContext.d__48.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Abp.EntityFrameworkCore.AbpDbContext.d__49.MoveNext() in D:\Github\aspnetboilerplate\src\Abp.EntityFrameworkCore\EntityFrameworkCore\AbpDbContext.cs:line 214

INFO 2018-04-11 13:59:53,439 [3 ] ore.Mvc.Internal.ControllerActionInvoker - Executing action method MyCompany.MyProject.AdditionalMasterData.Tests.TestsAppService.CreateOrEdit (MyCompany.MyProject.Application) with arguments ([CreateOrEditTestDto ]) - ModelState is Valid WARN 2018-04-11 14:01:48,396 [4 ] Mvc.ExceptionHandling.AbpExceptionFilter - Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded. See http://go.microsoft.com/fwlink/?LinkId=527962 for information on understanding and handling optimistic concurrency exceptions. Abp.UI.UserFriendlyException: Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded. See http://go.microsoft.com/fwlink/?LinkId=527962 for information on understanding and handling optimistic concurrency exceptions. at MyCompany.MyProject.AdditionalMasterData.Tests.TestsAppService.d__7.MoveNext() in C:\Repo\MyProjectVenues\aspnet-core\src\MyCompany.MyProject.Application\AdditionalMasterData\Tests\TestsAppService.cs:line 205 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MyCompany.MyProject.AdditionalMasterData.Tests.TestsAppService.d__6.MoveNext() in C:\Repo\MyProjectVenues\aspnet-core\src\MyCompany.MyProject.Application\AdditionalMasterData\Tests\TestsAppService.cs:line 170 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__12.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__14.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.d__23.MoveNext()

更新

我已经找到了问题的根本原因。

所以基本上我在 Entity2 上有一个插入触发器，当我在这个触发器内评论查询时，它就可以正常工作了。

此触发器中有大约 10 个查询，很难知道哪一个查询导致了问题。那么您能告诉我如何调试这个触发器吗？

Answer 1

我也遇到了类似的问题。我用的是 EF Core。我的代码的以下更改对我有所帮助。

context.Entry(user).State = EntityState.Added; // added row
this.context.Users.Add(user);
this.context.SaveChanges();

UPD:抱歉，问题已通过为 User.Id 添加 Identity 属性得到解决

    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]