我使用Visual Studio 2013與實體架構5和MySQL伺服器5.7.9。
當嘗試從資料庫建立模型(或“從資料庫更新模型”)時，将顯示以下消息：
‘System.Data.StrongTypingException: The value for column
‘IsPrimaryKey’ in table ‘TableDetails’ is DBNull . —> System.InvalidCastException: Specified cast is not valid.
我知道這個問題以前被問過，但我沒有找到任何解決方案。
我也沒有選擇降級到MySQL 5.6。
即使對于簡單的表也出現問題。
樣本表
CREATE TABLE new_table
(
id int(11) NOT NULL AUTO_INCREMENT,
name varchar(45) NOT NULL,
PRIMARY KEY (id)
)
ENGINE = InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
如果表隻包含主鍵，則會按照原樣建立模型。
編輯：
如果我使兩個字段PRIMARY鍵，正在建立模型沒有任何錯誤。
有沒有人有這個想法？
親切的問候。
完整的錯誤堆棧：
Unable to generate the model because of the following exception:
‘System.Data.StrongTypingException: The value for column
‘IsPrimaryKey’ in table ‘TableDetails’ is DBNull. —>
System.InvalidCastException: Specified cast is not valid. at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.TableDetailsRow.get_IsPrimaryKey()
— End of inner exception stack trace — at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.TableDetailsRow.get_IsPrimaryKey()
at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.StoreModelBuilder.CreateProperties(IList1
columns, IList1 errors, List1& keyColumns, List1& excludedColumns,
List1& invalidKeyTypeColumns) at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.StoreModelBuilder.CreateEntityType(IList1
columns, Boolean& needsDefiningQuery) at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.StoreModelBuilder.CreateEntitySets(IEnumerable1
tableDetailsRows, EntityRegister entityRegister, IList1
entitySetsForReadOnlyEntityTypes, DbObjectType objectType) at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.StoreModelBuilder.CreateEntitySets(IEnumerable1
tableDetailsRowsForTables, IEnumerable1 tableDetailsRowsForViews,
EntityRegister entityRegister) at
Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.StoreModelBuilder.Build(StoreSchemaDetails
storeSchemaDetails) at
Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.CreateStoreModel()
at
Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.GenerateModel(List1
errors) at
Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModels(String
storeModelNamespace, List1 errors) at
Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModel(EdmxHelper
edmxHelper)’. Loading metadata from the database took
00:00:00.5856317.