MySQL 实体：表 'TableDetails' 中列 'IsPrimaryKey' 的值是 DBNull

我用的是Visual Studio 2013加Entity Framework 5和MySQL Server 5.7.9.

try 从数据库(or 'Update Model From Database')创建模型时，会出现以下消息:

'System.Data.StrongTypingException: The value for column 'IsPrimaryKey' in table 'TableDetails' is DBNull . ---> System.InvalidCastException: Specified cast is not valid.

我知道以前有人问过这个问题，但我还没有找到任何解决办法.

即使对于一个简单的表，问题也会出现.

样本表

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;

如果表仅由主键组成，那么模型将按其应有的方式创建.

EDIT:

有人知道这件事吗？

亲切的问候.

完整的错误堆栈:

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.