EF Core - 盡管運行 Scaffold-DbContext 后有外鍵，但 class 中缺少相關實體

Question

在 SQL 服務器數據庫中，我有兩個幾乎相同的表TBL_1和TBL_2 。 以下是兩個表的創建腳本：

TBL_1：

CREATE TABLE [dbo].[TBL_1](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](100) NOT NULL,
    [value_type_ID] [int] NOT NULL,
    [description] [nvarchar](150) NOT NULL,
 CONSTRAINT [PK_TBL_1] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_1] ADD  CONSTRAINT [DF__TBL_1__param__40F9A68C]  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_1] ADD  CONSTRAINT [DF_TBL_1_description]  DEFAULT ('-') FOR [description]
GO

ALTER TABLE [dbo].[TBL_1]  WITH CHECK ADD  CONSTRAINT [TBL_1_TBL_value_types] FOREIGN KEY([value_type_ID])
REFERENCES [dbo].[TBL_Value_Type_Definition] ([value_type_ID])
GO

ALTER TABLE [dbo].[TBL_1] CHECK CONSTRAINT [TBL_1_TBL_value_types]
GO

TBL_2：

CREATE TABLE [dbo].[TBL_2](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](100) NOT NULL,
    [value_type_ID] [int] NOT NULL,
 CONSTRAINT [PK_TBL_2] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_2] ADD  CONSTRAINT [DF_TBL_2_name]  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_2]  WITH CHECK ADD  CONSTRAINT [TBL_2_TBL_value_types] FOREIGN KEY([value_type_ID])
REFERENCES [dbo].[TBL_Value_Type_Definition] ([value_type_ID])
GO

ALTER TABLE [dbo].[TBL_2] CHECK CONSTRAINT [TBL_2_TBL_value_types]
GO

執行Scaffold-DbContext后，為這兩個表生成了如下類：

public partial class Tbl2
{
    public Tbl2()
    {
        Tbl2Translations = new HashSet<Tbl2Translation>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public int ValueTypeId { get; set; }

    public virtual ICollection<Tbl2Translation> Tbl2Translations { get; set; }
}

public partial class Tbl1
{
    public Tbl1()
    {
        Tbl1Translations = new HashSet<Tbl1Translation>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public int ValueTypeId { get; set; }
    public string Description { get; set; }

    public virtual TblValueTypeDefinition ValueType { get; set; }
    public virtual ICollection<Tbl1Translation> Tbl1Translations { get; set; }
}

出於某種原因，為Tbl1生成了相關的ValueType ，但沒有為Tbl2 。 我已經比較了數據庫中的表，但我找不到任何明顯的原因來說明Tbl2中缺少相關ValueType的原因。 這非常令人沮喪，因為我沒有調試此問題的起點，所以基本上感覺就像大海撈針。 這是生成的TblValueTypeDefinition class：

public partial class TblValueTypeDefinition
{
    public TblValueTypeDefinition()
    {
        Tbl2s = new HashSet<Tbl2>();
    }

    public int ValueTypeId { get; set; }
    public string Name { get; set; }
    public string Unit { get; set; }
    public string Type { get; set; }

    public virtual ICollection<Tbl2> Tbl2s { get; set; }
}

這是該表的創建腳本：

CREATE TABLE [dbo].[TBL_Value_Type_Definition](
    [value_type_ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](50) NOT NULL,
    [unit] [nvarchar](10) NOT NULL,
    [type] [nvarchar](10) NOT NULL,
 CONSTRAINT [PK_TBL_Value_Type_Definition] PRIMARY KEY CLUSTERED 
(
    [value_type_ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [unit]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [type]
GO

其中一張表中缺少相關實體的原因可能是什么？

Answer 1

表 1在表名REFERENCES [dbo].[TBL_value_types]而不是REFERENCES [dbo].[TBL_Value_Type_Definition]中有錯誤

Table2有相同的錯誤（表名）。 REFERENCES [dbo].[TBL_value_types]而不是 REFERENCES [dbo].[TBL_Value_Type_Definition]

表已創建，但引用已損壞。 沒有創建外鍵。

固定代碼 - Sql 腳本

CREATE TABLE [dbo].[TBL_Value_Type_Definition](
    [value_type_ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](50) NOT NULL,
    [unit] [nvarchar](10) NOT NULL,
    [type] [nvarchar](10) NOT NULL,
 CONSTRAINT [PK_TBL_Value_Type_Definition] PRIMARY KEY CLUSTERED 
(
    [value_type_ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [unit]
GO

ALTER TABLE [dbo].[TBL_Value_Type_Definition] ADD  DEFAULT ('-') FOR [type]
GO


CREATE TABLE [dbo].[TBL_1](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](100) NOT NULL,
    [value_type_ID] [int] NOT NULL,
    [description] [nvarchar](150) NOT NULL,
 CONSTRAINT [PK_TBL_1] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_1] ADD  CONSTRAINT [DF__TBL_1__param__40F9A68C]  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_1] ADD  CONSTRAINT [DF_TBL_1_description]  DEFAULT ('-') FOR [description]
GO

ALTER TABLE [dbo].[TBL_1]  WITH CHECK ADD  CONSTRAINT [TBL_1_TBL_value_types] FOREIGN KEY([value_type_ID])
REFERENCES [dbo].[TBL_Value_Type_Definition] ([value_type_ID])
GO

ALTER TABLE [dbo].[TBL_1] CHECK CONSTRAINT [TBL_1_TBL_value_types]
GO


CREATE TABLE [dbo].[TBL_2](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](100) NOT NULL,
    [value_type_ID] [int] NOT NULL,
 CONSTRAINT [PK_TBL_2] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[TBL_2] ADD  CONSTRAINT [DF_TBL_2_name]  DEFAULT ('-') FOR [name]
GO

ALTER TABLE [dbo].[TBL_2]  WITH CHECK ADD  CONSTRAINT [TBL_2_TBL_value_types] FOREIGN KEY([value_type_ID])
REFERENCES [dbo].[TBL_Value_Type_Definition] ([value_type_ID])
GO

ALTER TABLE [dbo].[TBL_2] CHECK CONSTRAINT [TBL_2_TBL_value_types]
GO

來自Microsoft.EntityFrameworkCore.Tools的腳手架-DbContext nuget package

Scaffold-DbContext -Connection "Data Source=localhost; Initial Catalog=SO1;User ID=sa;Password=100;Encrypt=False" -Provider Microsoft.EntityFrameworkCore.SqlServer

生成代碼

SO1上下文.cs

using System;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

namespace EfCoreMissingRelated
{
    public partial class SO1Context : DbContext
    {
        public SO1Context()
        {
        }

        public SO1Context(DbContextOptions<SO1Context> options)
            : base(options)
        {
        }

        public virtual DbSet<Tbl1> Tbl1s { get; set; } = null!;
        public virtual DbSet<Tbl2> Tbl2s { get; set; } = null!;
        public virtual DbSet<TblValueTypeDefinition> TblValueTypeDefinitions { get; set; } = null!;

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see http://go.microsoft.com/fwlink/?LinkId=723263.
                optionsBuilder.UseSqlServer("Data Source=localhost; Initial Catalog=SO1;User ID=sa;Password=100;Encrypt=False");
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Tbl1>(entity =>
            {
                entity.ToTable("TBL_1");

                entity.Property(e => e.Id).HasColumnName("ID");

                entity.Property(e => e.Description)
                    .HasMaxLength(150)
                    .HasColumnName("description")
                    .HasDefaultValueSql("('-')");

                entity.Property(e => e.Name)
                    .HasMaxLength(100)
                    .HasColumnName("name")
                    .HasDefaultValueSql("('-')");

                entity.Property(e => e.ValueTypeId).HasColumnName("value_type_ID");

                entity.HasOne(d => d.ValueType)
                    .WithMany(p => p.Tbl1s)
                    .HasForeignKey(d => d.ValueTypeId)
                    .OnDelete(DeleteBehavior.ClientSetNull)
                    .HasConstraintName("TBL_1_TBL_value_types");
            });

            modelBuilder.Entity<Tbl2>(entity =>
            {
                entity.ToTable("TBL_2");

                entity.Property(e => e.Id).HasColumnName("ID");

                entity.Property(e => e.Name)
                    .HasMaxLength(100)
                    .HasColumnName("name")
                    .HasDefaultValueSql("('-')");

                entity.Property(e => e.ValueTypeId).HasColumnName("value_type_ID");

                entity.HasOne(d => d.ValueType)
                    .WithMany(p => p.Tbl2s)
                    .HasForeignKey(d => d.ValueTypeId)
                    .OnDelete(DeleteBehavior.ClientSetNull)
                    .HasConstraintName("TBL_2_TBL_value_types");
            });

            modelBuilder.Entity<TblValueTypeDefinition>(entity =>
            {
                entity.HasKey(e => e.ValueTypeId);

                entity.ToTable("TBL_Value_Type_Definition");

                entity.Property(e => e.ValueTypeId).HasColumnName("value_type_ID");

                entity.Property(e => e.Name)
                    .HasMaxLength(50)
                    .HasColumnName("name")
                    .HasDefaultValueSql("('-')");

                entity.Property(e => e.Type)
                    .HasMaxLength(10)
                    .HasColumnName("type")
                    .HasDefaultValueSql("('-')");

                entity.Property(e => e.Unit)
                    .HasMaxLength(10)
                    .HasColumnName("unit")
                    .HasDefaultValueSql("('-')");
            });

            OnModelCreatingPartial(modelBuilder);
        }

        partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
    }
}

表格1.cs

using System;
using System.Collections.Generic;

namespace EfCoreMissingRelated
{
    public partial class Tbl1
    {
        public int Id { get; set; }
        public string Name { get; set; } = null!;
        public int ValueTypeId { get; set; }
        public string Description { get; set; } = null!;

        public virtual TblValueTypeDefinition ValueType { get; set; } = null!;
    }
}

Tbl2.cs

using System;
using System.Collections.Generic;

namespace EfCoreMissingRelated
{
    public partial class Tbl2
    {
        public int Id { get; set; }
        public string Name { get; set; } = null!;
        public int ValueTypeId { get; set; }

        public virtual TblValueTypeDefinition ValueType { get; set; } = null!;
    }
}

TblValueTypeDefinition.cs

using System;
using System.Collections.Generic;

namespace EfCoreMissingRelated
{
    public partial class TblValueTypeDefinition
    {
        public TblValueTypeDefinition()
        {
            Tbl1s = new HashSet<Tbl1>();
            Tbl2s = new HashSet<Tbl2>();
        }

        public int ValueTypeId { get; set; }
        public string Name { get; set; } = null!;
        public string Unit { get; set; } = null!;
        public string Type { get; set; } = null!;

        public virtual ICollection<Tbl1> Tbl1s { get; set; }
        public virtual ICollection<Tbl2> Tbl2s { get; set; }
    }
}

EF Core - 盡管運行 Scaffold-DbContext 后有外鍵，但 class 中缺少相關實體

問題描述

1 個解決方案

解決方案1
1 2022-03-23 13:54:05

生成代碼

EF Core - 盡管運行 Scaffold-DbContext 后有外鍵，但 class 中缺少相關實體

問題描述

1 個解決方案

解決方案1 1 2022-03-23 13:54:05

生成代碼

解決方案1
1 2022-03-23 13:54:05