预计影响 1 行但实际影响 0 行的数据库操作
Database operation expected to affect 1 row(s) but actually affected 0 row(s)
我试图在两个表中插入记录，但出现异常。你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
留言：
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，当我在这个触发器中评论查询然后它工作正常。
此触发器中大约有 10 个查询，很难知道是哪个查询导致了问题。那么你能告诉我如何调试这个触发器吗？
确保在您的存储库函数 InsertAsync 中您没有调用 AddAsync，除非您使用 Microsoft.EntityFrameworkCore.Metadata.SqlServerValueGenerationStrategy.SequenceHiLo 生成器。如文档中所述。 AddAsync
我 运行 遇到了与 SQLite 数据库相同的问题，但使用的是更新而不是插入。调用 SaveChangesAsync 而不是 SaveChanges 是解决方案。
我遇到了类似的问题。我使用了 EF 核心。以下代码更改对我很有帮助。
context.Entry(user).State = EntityState.Added; // added row
this.context.Users.Add(user);
this.context.SaveChanges();
更新： 抱歉，问题已通过为 User.Id
添加身份属性解决
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
就我而言，当我试图将数据库中不存在的实体传递给 Update() 方法时引起的问题。
您还可以检查您的 table 是否启用了 PK（主键）身份选项。
确保生成的 SQL-query 确实可以到达目标行。
在我的例子中，查询如下所示：
UPDATE [Users] SET .....
WHERE [Id] = @p34 AND [ConcurrencyStamp] = null;
但是 'ConcurrencyStamp' 包含一个 not-null 值，所以没有什么可以更新的。
如果有人来到这里，背景和我一样，我有一个 Add 的错误，当我有一个 DateTime 列作为 PK 并且这个列是配置为 .HasDefaultValueSql("getdate()").
我不得不使用探查器来查看 EFCore 正在为此列发送 NULL 值并尝试与新生成的日期进行比较：
exec sp_executesql N'SET NOCOUNT ON;
DECLARE @inserted0 TABLE ([Current_Nbr] nvarchar(450), [Db_Date] datetime2, [_Position] [int]);
MERGE [Current_Moves] USING (
VALUES (@p0, @p1, @p2, @p3, 0)) AS i ([Current_Nbr], [Despatch_Number], [Current_Loc], [Operator], _Position) ON 1=0
WHEN NOT MATCHED THEN
INSERT ([Current_Nbr], [Despatch_Number], [Current_Loc], [Operator])
VALUES (i.[Current_Nbr], i.[Despatch_Number], i.[Current_Loc], i.[Operator])
OUTPUT INSERTED.[Current_Nbr], INSERTED.[Db_Date], i._Position
INTO @inserted0;
SELECT [t].[Db_Date] FROM [Current_Moves] t
INNER JOIN @inserted0 i ON ([t].[Current_Nbr] = [i].[Current_Nbr]) AND ([t].[Db_Date] = [i].[Db_Date])
ORDER BY [i].[_Position];
',
N'@p0 nvarchar(450),@p1 nvarchar(4000),@p2 nvarchar(4000),@p3 nvarchar(4000)',
@p0=N'AAAAA',@p1=NULL,@p2=N'LOC_123',@p3=N'xxxxx'
我实际上还没有修复 那个 错误，但我能够通过在 C# 上设置 DateTime 列的值来使其工作，而不是期望数据库这样做。
我的代码的问题是，我正在设置 primary key value for tables explicitly，它是 not db generated，但是 efcore 不知道这一点.. 所以最后我需要写 (ValueGeneratedNever)
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
//TODO: on add any entity add here the same
modelBuilder.Entity<AdminUser>().Property(e => e.AdminUserId).ValueGeneratedNever();
modelBuilder.Entity<AdminUserLogInLog>().Property(e => e.AdminUserLogInLogId).ValueGeneratedNever();
...........
}
Generic method for all table
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
foreach (var item in modelBuilder.Model.GetEntityTypes())
{
var p = item.FindPrimaryKey().Properties.FirstOrDefault(i=>i.ValueGenerated!=Microsoft.EntityFrameworkCore.Metadata.ValueGenerated.Never);
if (p!=null)
{
p.ValueGenerated = Microsoft.EntityFrameworkCore.Metadata.ValueGenerated.Never;
}
}
}
与其他用户一样，我的问题是由 SQL 服务器中的 rowversion（在我们的模型中称为 byte[] ChangeVersion）引起的。 Entity Framework 附加 where ChangeVersion = ... 作为 SQL 查询的一部分。但是，用于 ChangeVersion 的值 Entity Framework 是默认值 (0)。 Entity Framework 已决定 ChangeVersion 属性 不应使用以下内容从数据库中填充：
var deleteCompany = dbContext.Company.FirstOrDefault(x => x.CompanyId == cmvm.DeleteCompanyId.Value);
// at this point, deleteCompany.ChangeVersion = 0 but other fields are populated.
dbContext.Company.Remove(deleteCompany);
dbContext.SaveChanges(); // error expected 1 row but 0 affected
模型生成器看起来像
entity.Property(e => e.ChangeVersion).HasColumnName("ChangeVersion")
.IsRequired()
.IsRowVersion();
将原始查找查询更改为 AsNoTracking 可解决此问题。这可以正常工作
// Call this AsNoTracking. Otherwise Entity Frameworks throws out the ChangeVersion for some reason.
var deleteCompany = dbContext.Company.AsNoTracking().FirstOrDefault(x => x.CompanyId == cmvm.DeleteCompanyId.Value);
dbContext.Entry(deleteCompany).State = EntityState.Deleted;
dbContext.Company.Remove(deleteCompany);
dbContext.SaveChanges();
我发现这可能是主键的绑定问题。检查您的查询字符串以确保所有内容都在您的视图和更新操作中正确绑定。 （确保查询字符串值没有覆盖输入值）。
我试图在两个表中插入记录，但出现异常。你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
留言：
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，当我在这个触发器中评论查询然后它工作正常。
此触发器中大约有 10 个查询，很难知道是哪个查询导致了问题。那么你能告诉我如何调试这个触发器吗？
确保在您的存储库函数 InsertAsync 中您没有调用 AddAsync，除非您使用 Microsoft.EntityFrameworkCore.Metadata.SqlServerValueGenerationStrategy.SequenceHiLo 生成器。如文档中所述。 AddAsync
我 运行 遇到了与 SQLite 数据库相同的问题，但使用的是更新而不是插入。调用 SaveChangesAsync 而不是 SaveChanges 是解决方案。
我遇到了类似的问题。我使用了 EF 核心。以下代码更改对我很有帮助。
context.Entry(user).State = EntityState.Added; // added row
this.context.Users.Add(user);
this.context.SaveChanges();
更新： 抱歉，问题已通过为 User.Id
添加身份属性解决 [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
就我而言，当我试图将数据库中不存在的实体传递给 Update() 方法时引起的问题。
您还可以检查您的 table 是否启用了 PK（主键）身份选项。
确保生成的 SQL-query 确实可以到达目标行。 在我的例子中，查询如下所示：
UPDATE [Users] SET .....
WHERE [Id] = @p34 AND [ConcurrencyStamp] = null;
但是 'ConcurrencyStamp' 包含一个 not-null 值，所以没有什么可以更新的。
如果有人来到这里，背景和我一样，我有一个 Add 的错误，当我有一个 DateTime 列作为 PK 并且这个列是配置为 .HasDefaultValueSql("getdate()").
我不得不使用探查器来查看 EFCore 正在为此列发送 NULL 值并尝试与新生成的日期进行比较：
exec sp_executesql N'SET NOCOUNT ON;
DECLARE @inserted0 TABLE ([Current_Nbr] nvarchar(450), [Db_Date] datetime2, [_Position] [int]);
MERGE [Current_Moves] USING (
VALUES (@p0, @p1, @p2, @p3, 0)) AS i ([Current_Nbr], [Despatch_Number], [Current_Loc], [Operator], _Position) ON 1=0
WHEN NOT MATCHED THEN
INSERT ([Current_Nbr], [Despatch_Number], [Current_Loc], [Operator])
VALUES (i.[Current_Nbr], i.[Despatch_Number], i.[Current_Loc], i.[Operator])
OUTPUT INSERTED.[Current_Nbr], INSERTED.[Db_Date], i._Position
INTO @inserted0;
SELECT [t].[Db_Date] FROM [Current_Moves] t
INNER JOIN @inserted0 i ON ([t].[Current_Nbr] = [i].[Current_Nbr]) AND ([t].[Db_Date] = [i].[Db_Date])
ORDER BY [i].[_Position];
',
N'@p0 nvarchar(450),@p1 nvarchar(4000),@p2 nvarchar(4000),@p3 nvarchar(4000)',
@p0=N'AAAAA',@p1=NULL,@p2=N'LOC_123',@p3=N'xxxxx'
我实际上还没有修复 那个 错误，但我能够通过在 C# 上设置 DateTime 列的值来使其工作，而不是期望数据库这样做。
我的代码的问题是，我正在设置 primary key value for tables explicitly，它是 not db generated，但是 efcore 不知道这一点.. 所以最后我需要写 (ValueGeneratedNever)
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
//TODO: on add any entity add here the same
modelBuilder.Entity<AdminUser>().Property(e => e.AdminUserId).ValueGeneratedNever();
modelBuilder.Entity<AdminUserLogInLog>().Property(e => e.AdminUserLogInLogId).ValueGeneratedNever();
...........
}
Generic method for all table
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
foreach (var item in modelBuilder.Model.GetEntityTypes())
{
var p = item.FindPrimaryKey().Properties.FirstOrDefault(i=>i.ValueGenerated!=Microsoft.EntityFrameworkCore.Metadata.ValueGenerated.Never);
if (p!=null)
{
p.ValueGenerated = Microsoft.EntityFrameworkCore.Metadata.ValueGenerated.Never;
}
}
}
与其他用户一样，我的问题是由 SQL 服务器中的 rowversion（在我们的模型中称为 byte[] ChangeVersion）引起的。 Entity Framework 附加 where ChangeVersion = ... 作为 SQL 查询的一部分。但是，用于 ChangeVersion 的值 Entity Framework 是默认值 (0)。 Entity Framework 已决定 ChangeVersion 属性 不应使用以下内容从数据库中填充：
var deleteCompany = dbContext.Company.FirstOrDefault(x => x.CompanyId == cmvm.DeleteCompanyId.Value);
// at this point, deleteCompany.ChangeVersion = 0 but other fields are populated.
dbContext.Company.Remove(deleteCompany);
dbContext.SaveChanges(); // error expected 1 row but 0 affected
模型生成器看起来像
entity.Property(e => e.ChangeVersion).HasColumnName("ChangeVersion")
.IsRequired()
.IsRowVersion();
将原始查找查询更改为 AsNoTracking 可解决此问题。这可以正常工作
// Call this AsNoTracking. Otherwise Entity Frameworks throws out the ChangeVersion for some reason.
var deleteCompany = dbContext.Company.AsNoTracking().FirstOrDefault(x => x.CompanyId == cmvm.DeleteCompanyId.Value);
dbContext.Entry(deleteCompany).State = EntityState.Deleted;
dbContext.Company.Remove(deleteCompany);
dbContext.SaveChanges();
我发现这可能是主键的绑定问题。检查您的查询字符串以确保所有内容都在您的视图和更新操作中正确绑定。 （确保查询字符串值没有覆盖输入值）。