2
我想升級EF數據庫模式。模式升級後，表，索引和鍵都看起來是正確的，但是當我運行應用程序時，我發現所有插入失敗（更新正常），包括我沒有更改的表。例如，我有這個腳本生成的表：實體框架5失敗所有插入無法將值NULL插入到'Id'列
CREATE TABLE [dbo].[BlogPosts] (
[Id] int IDENTITY(1,1) NOT NULL,
[Date] datetime NOT NULL,
[Title] nvarchar(max) NOT NULL,
[Post] nvarchar(max) NOT NULL,
[Category] nvarchar(max) NOT NULL);
ALTER TABLE [dbo].[BlogPosts]
ADD CONSTRAINT [PK_BlogPosts]
PRIMARY KEY CLUSTERED ([Id] ASC);
但是當我嘗試添加一個新的博客文章，我看到以下錯誤：
Cannot insert the value NULL into column 'Id', table 'ptytest.dbo.BlogPosts';
column does not allow nulls. INSERT fails.
的IntelliTrace顯示以下插入：
ADO.NET:Execute Reader "insert [dbo].[BlogPosts]([Date], [Title], [Post], [Category])
values (@0, @1, @2, @3)
select [Id]
from [dbo].[BlogPosts]
where @@ROWCOUNT > 0 and [Id] = scope_identity()"
帶有新模式的乾淨數據庫在類似的SQL下工作正常。不知何故，這不是在升級的模式中正確對待身份密鑰。有什麼想法發生了什麼？
這裏是從原來的db.SaveChanges堆棧跟蹤（）
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1753986
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5296058
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +558
System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1682
System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +59
System.Data.SqlClient.SqlDataReader.get_MetaData() +90
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +365
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite) +1379
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +175
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +134
System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41
System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10
System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) +217
System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +262
[UpdateException: An error occurred while updating the entries. See the inner exception for details.]
System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +444
System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) +146
System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) +571
System.Data.Entity.Internal.InternalContext.SaveChanges() +323
[DbUpdateException: An error occurred while updating the entries. See the inner exception for details.]
System.Data.Entity.Internal.InternalContext.SaveChanges() +369
System.Data.Entity.Internal.LazyInternalContext.SaveChanges() +53
System.Data.Entity.DbContext.SaveChanges() +52
code first or edmx？ –
請顯示拋出的代碼無法插入值NULL錯誤。 – TheGeekYouNeed
SQL不會在該表上給出該錯誤。 「Id」一定不能是「IDENTITY」列。 –