Entity Framework 表拆分

　　把一个表拆分成多实体。。例如：把一个博客Blogs表，拆分成Blog、BlogDetail两个实体。

（1）实体类

// Blog
public class Blog
{
    public int Id { get; set; }

    public string Title { get; set; }

    public string Author { get; set; }

    public DateTime CreatedTime { get; set; }

    public virtual BlogDetail BlogDetail { get; set; }
}

// BlogDetail
public class BlogDetail
{
    public int Id { get; set; }

    public string Context { get; set; }

    public virtual Blog Blog { get; set; }
}

（2）映射

// BlogMap
public class BlogMap : EntityTypeConfiguration<Blog>
{
    public BlogMap()
    {
        this.ToTable("Blogs");

        this.HasKey(p => p.Id);

        this.Property(p => p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        this.Property(p => p.Title).IsRequired().HasMaxLength(63);
        this.Property(p => p.Author).IsRequired().HasMaxLength(31);
        this.Property(p => p.CreatedTime).IsRequired();
    }
}

// BlogDetail
public class BlogDetailMap : EntityTypeConfiguration<BlogDetail>
{
    public BlogDetailMap()
    {
        this.ToTable("Blogs");

        this.HasKey(p => p.Id);

        this.Property(p => p.Context).IsOptional();

        this.HasRequired(p => p.Blog)
            .WithRequiredPrincipal(p => p.BlogDetail);
    }
}

// DbContext
public class ConsAppContext : DbContext
{
    public IDbSet<Blog> BlogSet { get; set; }

    public IDbSet<BlogDetail> BlogDetaisSet { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new BlogMap());
        modelBuilder.Configurations.Add(new BlogDetailMap());
        base.OnModelCreating(modelBuilder);
    }
}

 （3）生成效果