CORE EF生成ORACLE数据库模型报错问题记录

需求：最近在新开发一套在LINUX运行的API接口，需要用到net core api框架以及oracle数据库，首先需要解决的就是连接数据库问题，由于是DBFirst 加上之前很多老表不规范，导致了core EF生成模型报错。正在解决。

net core版本： 2.2

依赖库：

Microsoft.EntityFrameworkCore 2.2.6
Oracle.EntityFrameworkCore  2.2.6
Microsoft.EntityFrameworkCore.Tools 2.2.6
Microsoft.VisualStudio.Web.CodeGeneration.Design 2.2.4

在VS2019控制台通过以下语句生成数据库模型

 Scaffold-DbContext "DATA SOURCE=地址:1521/zmbx;PASSWORD=密码;PERSIST SECURITY INFO=True;USER ID=XXX;Validate Connection = true;" Oracle.EntityFrameworkCore -OutputDir Models -Project DBLib -Force

采用-Tables USERMOBILE 去生成表模型，可以生成 。 但是多个表生成就会有问题。根据提示信息表示可能是存在主键为空。有没有办法跳过为空的继续生成？

错误如下

The column 'xxx.xxx.ISCREATEPLAN' would normally be mapped to a non-nullable bool property, but it has a default constraint. Such a column is mapped to a nullable bool property to 
allow a difference between setting the property to false and invoking the default constraint. See https://go.microsoft.com/fwlink/?linkid=851278 for details.
Unable to identify the primary key for table 'xxx.xxx'.
Unable to generate entity type for table 'xxx.xxx'.
System.InvalidOperationException: The property list {'UserId', 'UserId'} cannot be used, because it contains a duplicate - 'UserId'.
   at Microsoft.EntityFrameworkCore.Metadata.Internal.EntityType.AddKey(IReadOnlyList` properties, ConfigurationSource configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasKeyInternal(IReadOnlyList` properties, Nullable` configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.PrimaryKey(IReadOnlyList` properties, ConfigurationSource configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.PrimaryKey(IReadOnlyList` propertyNames, ConfigurationSource configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder.HasKey(String[] propertyNames)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.VisitPrimaryKey(EntityTypeBuilder builder, DatabaseTable table)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.VisitTable(ModelBuilder modelBuilder, DatabaseTable table)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.VisitTables(ModelBuilder modelBuilder, ICollection` tables)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.VisitDatabaseModel(ModelBuilder modelBuilder, DatabaseModel databaseModel)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.Create(DatabaseModel databaseModel, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, IEnumerable` tables, IEnumerable` schemas, String namespace, String language, String contextDir, String contextName, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions)
   at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable` schemas, IEnumerable` tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable` schemaFilters, IEnumerable` tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>c__DisplayClass0_1.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`.<Execute>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
The property list {'UserId', 'UserId'} cannot be used, because it contains a duplicate - 'UserId'.