我正在尝试为具有复杂值对象的实体建模。
数据库结构可能与此类似:
+-------------------------------------+
| car |
+----------------------+--------------+
| id | CHAR(40) |
+----------------------+--------------+
| model | VARCHAR(255) |
+----------------------+--------------+
| specs_engine_version | VARCHAR(255) |
+----------------------+--------------+
| specs_lighting | VARCHAR(255) |
+----------------------+--------------+
+------------------------------------+
| specs_interior_equipment |
+-----------------------+------------+
| car_id | CHAR(40) |
+-----------------------+------------+
| interior_equipment_id | INT(11) |
+-----------------------+------------+
这是Car
实体:
public class Car : IEntity<Guid>
{
public Guid Id { get; private set; }
public string Model { get; private set; }
public Specs Specs { get; set; }
public Car()
{ }
}
这是Specs
值对象:
public class Specs : ValueObject<Specs>
{
public string EngineVersion { get; private set; }
public string Lighting { get; private set; }
public List<int> InteriorEquipment { get; private set; }
public Specs()
{}
}
我正在或多或少地像这样配置映射:
class CarMap : IEntityTypeConfiguration<Car>
{
public void Configure(EntityTypeBuilder<Car> builder)
{
builder.HasKey(t => t.Id);
builder.ToTable("car");
builder.Property(e => e.Id).HasColumnName("id");
builder.Property(e => e.Name).HasColumnName("name");
builder.OwnsOne(j => j.Specs, l =>
{
l.Property(t => t.EngineVersion).HasColumnName("specs_engine_version");
l.Property(t => t.Lighting).HasColumnName("specs_lighting");
});
}
}
问题是:我应该如何配置映射以将内部设备保留在单独的表中?
我知道我可以将室内设备定义为对象,例如:
builder
.HasMany(j => j.InteriorEquipment)
.WithOne()
.HasForeignKey(t => t.CarId)
.OnDelete(DeleteBehavior.Cascade)
.Metadata.PrincipalToDependent.SetPropertyAccessMode(PropertyAccessMode.Field);
但是我不知道如何加入所有片段...
你能帮我吗?
答案 0 :(得分:2)
马克
我认为在您的情况下,您需要一个单独的类来构建表规格,这不应在car类中完成,例如:
class SpecMap : IEntityTypeConfiguration<Spec>
然后,您可以在存储库调用中添加一个函数以检索所有信息。
在这里,我向您发布我们如何在InfoJobs中解决此问题,希望对您有所帮助。
将候选类别指向CandidateResumeDeficiencies,因此候选可以具有CandidateResumeDeficiency列表。
-> CandidateResumeClass
公共类CandidateResume:BaseEntity,IAggregateRoot { #region。:属性:。
public int IdCandidateResume { get; protected set; }
public int IdCandidate { get; protected set; }
....
}
->虚弱类
public class CandidateResumeDeficiency
{
public int IdCandidateResumeDeficiency { get; private set; }
public int IdCandidateResume { get; private set; }
public int IdDeficiency1 { get; private set; }
...
}
->建设者
class CandidateEntityTypeConfiguration : IEntityTypeConfiguration<Candidate>
{
public void Configure(EntityTypeBuilder<Candidate> builder)
{
builder.ToTable("candidates", EFContext.DbSchema.candidate.ToString());
builder.HasKey(b => b.IdCandidate);
builder.HasAlternateKey(b => new { b.IdCompany, b.Email });
}
}
class CandidateResumeDeficiencyEntityTypeConfiguration : IEntityTypeConfiguration<CandidateResumeDeficiency>
{
public void Configure(EntityTypeBuilder<CandidateResumeDeficiency> builder)
{
builder.ToTable("candidateresumedeficiencies", EFContext.DbSchema.candidate.ToString());
builder.HasKey(b => b.IdCandidateResumeDeficiency);
}
}
->存储库
public class CandidateResumeRepository : EFRepository<CandidateResume, int>, ICandidateResumeRepository
{
public CandidateResumeRepository(EFContext dbContext) : base(dbContext)
{
}
public async Task<CandidateResume> GetFullAsync(int idCandidateResume) =>
await ((EFContext)_dbContext).CandidateResumes
.Include(c => c.Deficiencies)
.FirstOrDefaultAsync(c => c.IdCandidateResume == idCandidateResume);
}
答案 1 :(得分:0)
我找到了一种解决方案,可以通过使用一个对象来代表设备来保持表分裂。
这是映射配置:
class CarMap : IEntityTypeConfiguration<Car>
{
public void Configure(EntityTypeBuilder<Car> builder)
{
builder.HasKey(t => t.Id);
builder.ToTable("car");
builder.Property(e => e.Id).HasColumnName("id");
builder.Property(e => e.Name).HasColumnName("name");
builder.OwnsOne(j => j.Specs, l =>
{
l.Property(t => t.EngineVersion).HasColumnName("specs_engine_version");
l.Property(t => t.Lighting).HasColumnName("specs_lighting");
l.OwnsMany(x => x.InteriorEquipment, x =>
{
x.HasKey(t => t.Id);
x.WithOwner().HasForeignKey("CarId");
x.ToTable("specs_interior_equipment");
x.Property(j => j.Id).HasColumnName("id");
x.Property(j => j.CategoryId).HasColumnName("equipment_id");
x.Property(j => j.CarId).HasColumnName("car_id");
});
});
}
}
这是设备对象:
public class Equipment: TEntity<Guid>
{
private Equipment() { }
public Equipment(Guid carId, int equipmentId)
{
Id = Guid.NewGuid();
CarId = carId;
EquipomentId = equipmentId;
}
public Guid Id { get; internal set; }
public Guid CarId { get; internal set; }
public int EquipmentId { get; internal set; }
}