Question

我是EF4 CTP5的新手，我想在下面创建一个模型，每个表都是相同的字段（id，text，value），我不想将它们全部放在一个表中，我可以使用基类吗？？但我不知道它是如何成为我的域名模型的？

public class BaseSearchType
{
   public int Id {get;set;}
   public int text{get;set;}
   public int value {get;set;}
}

public class BooleanSearchTypeTable :BaseSearchType
{

}

public class JobStatusSearchTypeTable:BaseSearchType
{

}

public class PersonStatusSearchTypeTable: BaseSearchType
{

}

表

BooleanSearchTypeTable 
-----------------
id text value
1   All  0
2   Yes  1
3   No   2

JobStatusSearchTypeTable
-----------------
id text value
1   Open  0
2   Closed  1
3   Approved   2
4   Rejected 3
5   Waiting 4

PersonStatusSearchTypeTable
id text value
1   Work 0
2   Seek 1
3   Vacation 2

Answer 1

在您指示EF执行此操作之前，它们不会映射到一个表中。只需定义您的类，如：

public abstract class BaseSearchType
{
    public int Id { get; set; }
    public string text { get; set; }
    public int value { get; set; }
}

public class BooleanSearchTypeTable : BaseSearchType
{ }

public class JobStatusSearchTypeTable : BaseSearchType
{ }

public class PersonStatusSearchTypeTable : BaseSearchType
{ }

你的背景如下：

public class Context : DbContext
{
    public DbSet<JobStatusSearchTypeTable> JobStatuses { get; set; }
    public DbSet<BooleanSearchTypeTable> BooleanStatuses { get; set; }
    public DbSet<PersonStatusSearchTypeTable> PersonStatuses { get; set; }
}

Answer 2

尝试使用“POCO”模型，在这种情况下可能会有所帮助

http://blogs.msdn.com/b/adonet/archive/2009/05/21/poco-in-the-entity-framework-part-1-the-experience.aspx

http://blogs.msdn.com/b/adonet/archive/2009/05/28/poco-in-the-entity-framework-part-2-complex-types-deferred-loading-and-explicit-loading.aspx

EF4 CTP5 CodeFirst建模问题

2 个答案: