[英]Fluent NHibernate: How to map FK keys as properties in .NET Core version
我們正在使用流暢的 API,我需要知道如何正確映射它,以便我們可以使用 ParentId 而不必通過 Parent 實體。 那可能嗎? 我知道可以使用 EF Core 來完成,所以我希望有一個類似的解決方案。
public class Parent
{
public int Id {get;set;}
public ISet<Child> Children {get;set;}
}
public class Child{
public int Id {get;set;}
public int ParentId {get;set;}
public Parent Parent {get;set;}
}
public static void Main()
{
var dummyQuery = Enumerable.Empty<Child>();
//Want to do like this.
dummyQuery= dummyQuery.Where(c => c.ParentId == 80).ToArray();
//This will do a join to the parent table.
dummyQuery= dummyQuery.Where(c => c.Parent.Id == 80).ToArray();
}
public class ChildMap : ClassMapping<Child>
{
public ChildMap ()
{
Table("Children");
//how do I do here?
ManyToOne(x => x.Parent, map => map.Column("ParentId"));
}
}
public class Parent
{
public virtual int Id { get; set; }
public virtual ISet<Child> Children { get; protected set; } = new HashSet<Child>();
}
public class Child
{
public virtual int Id { get; set; }
public virtual Parent Parent { get; set; }
}
public class ParentMap : ClassMapping<Parent>
{
public ParentMap()
{
Id(p => p.Id);
Set(p => p.Children, m => m.Inverse(true), m => m.OneToMany());
}
}
public class ChildMap : ClassMapping<Child>
{
public ChildMap()
{
Id(c => c.Id);
ManyToOne(c => c.Parent, map => map.Column("ParentId"));
}
}
// query
var res = session.Query<Child>().Where(c => c.Parent.Id == 80).ToArray();
通過此映射,我得到以下 sql
select child0_.Id as id1_1_, child0_.ParentId as parentid2_1_ from Child child0_ where child0_.ParentId=@p0;@p0 = 80 [Type: Int32 (0:0:0)]
根本不需要 parentId。 延遲加載可能已禁用。
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