如何在没有主键的情况下使用实体框架核心调用表

Question

I am doing an asp.net core api with odata. My tables in database has no primary key and I do not have permission to change the database. I use below command to call my database:

"dotnet ef dbcontext scaffold "Data Source = 192.168.11.1\\sql2016;Initial Catalog=SeeMiddle;persist security info=True;user id=Iaas;password=Iaas123!@#" Microsoft.EntityframeworkCore.SqlServer -d -c SeeMiddleContext -o Models\\Entities --force"

and I encounter below errors for every tables:

Unable to identify the primary key for table 'cmn.ReshteNerkhItem'.

Unable to generate entity type for table 'cmn.ReshteNerkhItem'.

how can I work with a database that has any primary key in asp.net core??

Answer 1

Short answer, you don't. Entity Framework requires a key. Good news is you can effectively spoof a key if your table doesn't have one. If your table has an implicit key that is distinct then just decorate that property with [Key] and you'll be good. The key thing is that it has to be a distinct unique value. If you do not have a singular column that does that then you'll need to start using columns together to make a composite key ( [Key, Column(Order = 0)] .