流利的Nhibernate映射hasMany

Question

在我的MSSQL中,我有两个表,Property和Photo.

为了缩短它,我将在这里写几个字段.属性表

Id int not null
Title nvarchar(255) not null
PhotoId int not null

照片桌

Id int not null
ImageData varbinary(MAX) null
ImageMimeType varchar(50) null

关系如下:

FK_Property_Photo

Primary Key table        Foreign key table
--------------------------------------------
Photo                    Property
--------------------------------------------
Id                       PhotoId

你可以想象一个属性可以有一个或多个图像.一个图像可以属于一个或多个属性.

我尝试过这种映射

public PropertyMap()
{
  Table("Property");
  Id(x => x.Id).GeneratedBy.Identity();
  Map(x => x.Title).Length(255).Not.Nullable();
  HasMany(x => x.Photos).KeyColumn("Id");
}

public PhotoMap()
 {
    Table("Photo");
    Id(x => x.Id).GeneratedBy.Identity();
    Map(x => x.Version);
    Map(x => x.ImageData).CustomSqlType("VARBINARY(MAX)").Length(160000);
    Map(x => x.ImageMimeType);
 }

Answer 1

您想要使用References和HasMany关联.您已经在使用HasMany,因此要获得其他关联:

public PropertyMap()
{
  Table("Property");
  Id(x => x.Id).GeneratedBy.Identity();
  Map(x => x.Title).Length(255).Not.Nullable();
  HasMany(x => x.Photos).KeyColumn("Id"); // you were already doing this
}

public PhotoMap()
 {
    Table("Photo");
    Id(x => x.Id).GeneratedBy.Identity();
    Map(x => x.Version);
    Map(x => x.ImageData).CustomSqlType("VARBINARY(MAX)").Length(160000);
    Map(x => x.ImageMimeType);
    References( x => x.Property ) // you'll need 'Property' in your class definition too
        .Column('PhotoId')
        .Cascade.All();
 }