table-per-hierarchy

问题 I'm moving from EF Core 2.2 to 3.1. One breaking change (#15392) was that it no longer composed over stored procedures, so you had to add 'AsEnumerable'. That usually works, but I have a stored procedure call on a TPH table where that fails: My call to the SPROC is: SqlParameter authorizedUserID_p = new SqlParameter("@authorizedUserID", authorizedUser.ID); IEnumerable<Post> query = context.Posts.FromSqlRaw<Post>("Post.USP_ReadPost @ID, @AuthorizedUserID", parameters: new[]{ parentID_p,

问题 I'm trying to plug BreezeJs into an existing datastructure and getting an error in the meta data fetch. I can replicate this by adding the following to the CarBones sample namespace CarBones.Models { public abstract class VanBase { public int Id { get; set; } public string Manufacturer { get; set; } public int Wheels { get; set; } } public class BasicVan : VanBase { } public class LiveriedVan : VanBase { public string Livery { get; set; } } } then in the context public DbSet<VanBase> Vans {

问题 Hey guys, I'm trying to create a TPH mapping on a hierarchy where the discriminating clause is the classical "IS NOT NULL" / "IS NULL" case. Here is the example, database wise: CREATE TABLE info.EducationTypes ( ID INT NOT NULL PRIMARY KEY, Name NVARCHAR(64) NOT NULL, FKParentID INT NULL REFERENCES info.EducationTypes(ID) ) the idea is to have a class hierarchy like the following one: public abstract class EducationType { public int ID { get; set; } public string Name { get; set; } } public

问题 First of all, these questions are similar but definitely not the same: Can I mix Table per Hierarchy and Table per Type in Entity Framework? - Refers to a different scenario. Entity Framework: mix table per type and table per hierarchy - Yet another scenario, that despite accepting answer to first scenario is not related to it (*). (*) Second of all, I have sucessfully mixed table-per-type and table-per-hierarchy in Entity Framework, when base entity is mapped using table-per-entity and the

问题 I have a Garage which contains Cars and Motorcycles . Cars and motorcycles are Vehicles . Here they are: public class Garage { public int Id { get; set; } public virtual List<Car> Cars { get; set; } public virtual List<Motorcycle> Motorcycles { get; set; } public Garage() { Cars = new List<Car>(); Motorcycles = new List<Motorcycle>(); } } public abstract class Vehicle { public int Id { get; set; } public string Make { get; set; } public string Model { get; set; } } public class Car : Vehicle

问题 I have a Garage which contains Cars and Motorcycles . Cars and motorcycles are Vehicles . Here they are: public class Garage { public int Id { get; set; } public virtual List<Car> Cars { get; set; } public virtual List<Motorcycle> Motorcycles { get; set; } public Garage() { Cars = new List<Car>(); Motorcycles = new List<Motorcycle>(); } } public abstract class Vehicle { public int Id { get; set; } public string Make { get; set; } public string Model { get; set; } } public class Car : Vehicle

问题 Further to this question: Entity Framework TPH with multiple abstract inheritance and VS.2008 sp1 .net 3.5 c# I decided to add Organizations and a School. Organization(abstract) inherits from Party, and School(concrete) inherits from Organization. I get the error: Error 1 Error 3034: Problem in Mapping Fragments starting at lines 73, 93: Two entities with different keys are mapped to the same row. Ensure these two mapping fragments do not map two groups of entities with different keys to the

问题 As of EF6 it is possible to do something like this when configuring Entity mappings using Table Per Hierarchy inheritance: public class MyContext : DbContext { public DbSet<Device> Devices { get; set; } protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<ABatteryPoweredDevice>().Property(c => c.BatteryLevel).HasColumnName("BatteryLevel"); modelBuilder.Entity<ADifferentBatteryPoweredDevice>().Property(c => c.BatteryLevel).HasColumnName("BatteryLevel"); }

问题 I am using Entity Framework 6.0.2 with an existing database in which tags are stored in a single table that looks like this: Id : int, primary key TagType : string, determine the type of tag, either "usertag" or "movietag" ItemId : int, contains the Id of the item to which is referred (either a User Id or a Movie Id) The following classes describe this situation: public class User { public int Id { get; set; } } public class Movie { public int Id { get; set; } } public abstract class Tag {

问题 I am using Entity Framework 6.0.2 with an existing database in which tags are stored in a single table that looks like this: Id : int, primary key TagType : string, determine the type of tag, either "usertag" or "movietag" ItemId : int, contains the Id of the item to which is referred (either a User Id or a Movie Id) The following classes describe this situation: public class User { public int Id { get; set; } } public class Movie { public int Id { get; set; } } public abstract class Tag {