Question

所以在这里工作时我们决定停止使用edmx并开始使用Code First，主要是因为一遍又一遍地合并edmx文件的问题。

使用文件 - ＆gt;新商品 - ＆gt; Ado.Net实体数据模型我已经从我们现有的数据库中创建了模型，但是当运行一些代码时我得到了这个错误我已经搜索过但无法弄清楚他们先说的是什么错误行324,343根本不存在于所提到的类中既不在生成的DBContext上。

这也应该开箱即用......

错误（3015）：从第324,343行开始映射片段中的问题：   外键约束   ＆＃39; SubModule_SubModulesCurricularUnitsAcademicYears＆＃39;从表   SubModulesCurricularUnitsAcademicYear（ModuleId，SubModuleId）到表   SubModule（Id，ModuleId）::映射不足：外键必须是   映射到参与外部的一些AssociationSet或EntitySets   概念方面的关键关联。

ERROR（3015）：从第99,135行开始映射片段时出现问题：   外键约束   ＆＃39; PlanStudiesCurricularUnit_PlanStudiesCurricularUnitsAcademicYears＆＃39;   来自表PlanStudiesCurricularUnitsAcademicYear（PlanStudyId，   CurricularUnitId）到表PlanStudiesCurricularUnit   （CurricularUnitId，PlanStudyId）::映射不足：外键   必须映射到参与的一些AssociationSet或EntitySets   概念方面的外键关联。

  CREATE TABLE [dbo].[SubModulesCurricularUnitsAcademicYears] (
    [PlanStudyId]      BIGINT         NOT NULL,
    [CurricularUnitId] BIGINT         NOT NULL,
    [AcademicYearId]   BIGINT         NOT NULL,
    [ModuleId]         BIGINT         NOT NULL,
    [SubModuleId]      BIGINT         NOT NULL,
    [TeacherId]        BIGINT         NOT NULL,

     ....
    CONSTRAINT [PK_SubModulesModulesCurricularUnitsAcademicYear] PRIMARY KEY CLUSTERED ([PlanStudyId] ASC, [CurricularUnitId] ASC, [AcademicYearId] ASC, [ModuleId] ASC, [SubModuleId] ASC, [TeacherId] ASC),
    CONSTRAINT [FK_SubModulesModulesCurricularUnitsAcademicYear_AcademicYears] FOREIGN KEY ([AcademicYearId]) REFERENCES [dbo].[AcademicYears] ([Id]),
    CONSTRAINT [FK_SubModulesModulesCurricularUnitsAcademicYear_CurricularUnits] FOREIGN KEY ([CurricularUnitId]) REFERENCES [dbo].[CurricularUnits] ([Id]),
    CONSTRAINT [FK_SubModulesModulesCurricularUnitsAcademicYear_PlanStudies] FOREIGN KEY ([PlanStudyId]) REFERENCES [dbo].[PlanStudies] ([Id]),
    CONSTRAINT [FK_SubModulesModulesCurricularUnitsAcademicYear_SubModules] FOREIGN KEY ([SubModuleId], [ModuleId]) REFERENCES [dbo].[SubModules] ([Id], [ModuleId]),
    CONSTRAINT [FK_SubModulesModulesCurricularUnitsAcademicYear_Users] FOREIGN KEY ([TeacherId]) REFERENCES [dbo].[Users] ([Id])
);




 CREATE TABLE [dbo].[SubModules] (
    [Id]          BIGINT         IDENTITY (1, 1) NOT NULL,
    [ModuleId]    BIGINT         NOT NULL,
    [Name]        NVARCHAR (150) NOT NULL,
    [Description] NVARCHAR (100) NULL,
    [Active]      BIT            CONSTRAINT [DF__SubModule__Activ__7A721B0A] DEFAULT ((1)) NOT NULL,
    [Deleted]     BIT            CONSTRAINT [DF_SubModules_Deleted] DEFAULT ((0)) NOT NULL,
    CONSTRAINT [PK_SubModules] PRIMARY KEY CLUSTERED ([Id] ASC, [ModuleId] ASC),
    CONSTRAINT [FK_SubMudules_Modules] FOREIGN KEY ([ModuleId]) REFERENCES [dbo].[Modules] ([Id]) ON DELETE CASCADE

生成的数据库上下文：

//onModelCreating only refers to Submodules and SubModulesCurricularUnitsAcademicYears in the following lines
...
protected override void OnModelCreating(DbModelBuilder modelBuilder){
   modelBuilder.Entity<SubModule>()
                .HasMany(e => e.SubModulesCurricularUnitsAcademicYears)
                .WithRequired(e => e.SubModule)
                .HasForeignKey(e => new { e.SubModuleId, e.ModuleId })
                .WillCascadeOnDelete(false);

            modelBuilder.Entity<SubModulesCurricularUnitsAcademicYear>()
                .Property(e => e.ECTS)
                .HasPrecision(5, 2);

}
...

生成poco＆＃39>

public partial class SubModulesCurricularUnitsAcademicYear
{
    [Key]
    [Column(Order = 0)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long PlanStudyId { get; set; }

    [Key]
    [Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long CurricularUnitId { get; set; }

    [Key]
    [Column(Order = 2)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long AcademicYearId { get; set; }

    [Key]
    [Column(Order = 3)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long ModuleId { get; set; }

    [Key]
    [Column(Order = 4)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long SubModuleId { get; set; }

    [Key]
    [Column(Order = 5)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long TeacherId { get; set; }

    ...

    public virtual AcademicYear AcademicYear { get; set; }

    public virtual CurricularUnit CurricularUnit { get; set; }

    public virtual PlanStudy PlanStudy { get; set; }

    public virtual SubModule SubModule { get; set; }

    public virtual User User { get; set; }
}


public partial class SubModule
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public SubModule()
    {
        SubModulesCurricularUnitsAcademicYears = new HashSet<SubModulesCurricularUnitsAcademicYear>();
    }

    [Key]
    [Column(Order = 0)]
    public long Id { get; set; }

    [Key]
    [Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long ModuleId { get; set; }

    ...


    public virtual Module Module { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<SubModulesCurricularUnitsAcademicYear> SubModulesCurricularUnitsAcademicYears { get; set; }
}

停止使用edmx，使用Code First开始出现此错误

0 个答案: