Nhibernate Parent Child未获取子列表
本文关键字:列表 获取 Parent Child Nhibernate | 更新日期: 2023-09-27 18:30:08
我有一个对象"Location",它有一个子位置列表。我的对象和映射看起来像这个
private int _id;
private string _name;
private IList<Location> _subLocations;
private IList<Stock> _stockList;
private Location _parent;
private bool _isActive;
private bool _recommend;
public virtual IList<Location> SubLocations
{
get
{
if (_subLocations == null)
{
_subLocations = new List<Location>();
}
return _subLocations;
}
set
{
_subLocations = value;
OnPropertyChanged("SubLocations");
}
}
// more properties ...
我的地图是这样的:
public class LocationMap:ClassMap<Location>
{
public LocationMap()
{
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.IsActive);
References(x => x.Parent);
HasMany(x => x.SubLocations).Where(x => x.IsActive == true);
HasMany(x => x.StockList).Where(x => x.IsActive == true);
Table("tbl_locations");
}
}
我也100%确信定位对象具有IsActive=真正的
但是当我得到一个Location对象时,SubLocations列表总是空的。有人知道这是怎么回事吗?或者有没有调试这样一个问题的想法?
编辑我的数据库如下:
Id Name IsActive Parent_id
1 Magazijn A 1 NULL
2 Magazijn B 1 NULL
3 Gang A 1 2
4 Rek B 1 3
查询这是我获取所有父位置的查询
public IList<Location> GetAllParentLocations()
{
var result = NHibernateHelper.Session.CreateQuery("from Location l fetch all properties where l.Parent is null and l.IsActive = true").List<Location>();
return (List<Location>)result ?? new List<Location>();
}
生成的SQL
NHibernate: select location0_.Id as Id15_, location0_.Name as Name15_, location0_.IsActive as IsActive15_, location0_.Parent_id as Parent4_15_ from tbl_locations location0_ where (location0_.Parent_id is null) and location0_.IsActive=1
NHibernate: SELECT sublocatio0_.Location_id as Location5_1_, sublocatio0_.Id as Id1_, sublocatio0_.Id as Id15_0_, sublocatio0_.Name as Name15_0_, sublocatio0_.IsActive as IsActive15_0_, sublocatio0_.Parent_id as Parent4_15_0_ FROM tbl_locations sublocatio0_ WHERE (sublocatio0_.IsActive = 1) and sublocatio0_.Location_id=@p0;@p0 = 1 [Type: Int32 (0)]
NHibernate: SELECT sublocatio0_.Location_id as Location5_1_, sublocatio0_.Id as Id1_, sublocatio0_.Id as Id15_0_, sublocatio0_.Name as Name15_0_, sublocatio0_.IsActive as IsActive15_0_, sublocatio0_.Parent_id as Parent4_15_0_ FROM tbl_locations sublocatio0_ WHERE (sublocatio0_.IsActive = 1) and sublocatio0_.Location_id=@p0;@p0 = 42 [Type: Int32 (0)]
NHibernate: SELECT sublocatio0_.Location_id as Location5_1_, sublocatio0_.Id as Id1_, sublocatio0_.Id as Id15_0_, sublocatio0_.Name as Name15_0_, sublocatio0_.IsActive as IsActive15_0_, sublocatio0_.Parent_id as Parent4_15_0_ FROM tbl_locations sublocatio0_ WHERE (sublocatio0_.IsActive = 1) and sublocatio0_.Location_id=@p0;@p0 = 60 [Type: Int32 (0)]
在查询中,它在"Location_id"列上执行where子句。但是它必须使用Parent_id列。不确定此Location_id列的来源。。。
您关闭了延迟加载吗?我建议你看看这个关于懒惰加载的链接nHibernate需要懒惰加载吗?
以下链接解决了我的问题:
Fluent NHibernate HasMany外键映射问题
我已将映射更改为:
HasMany(x => x.SubLocations).KeyColumns.Add("Parent_Id").Where(x => x.IsActive == true);