[英]Fluent NHibernate compositeid to mapped class
I'm trying to figure out how to use CompositeId to map another class. 我正在试图弄清楚如何使用CompositeId来映射另一个类。 Here's a test case:
这是一个测试用例:
The tables: 表格:
TestParent:
TestParentId (PK)
FavoriteColor
TestChild:
TestParentId (PK)
ChildName (PK)
Age
The classes in C#: C#中的类:
public class TestParent
{
public TestParent()
{
TestChildList = new List<TestChild>();
}
public virtual int TestParentId { get; set; }
public virtual string FavoriteColor { get; set; }
public virtual IList<TestChild> TestChildList { get; set; }
}
public class TestChild
{
public virtual TestParent Parent { get; set; }
public virtual string ChildName { get; set; }
public virtual int Age { get; set; }
public override int GetHashCode()
{
return Parent.GetHashCode() ^ ChildName.GetHashCode();
}
public override bool Equals(object obj)
{
if (obj is TestChild)
{
var toCompare = obj as TestChild;
return this.GetHashCode() != toCompare.GetHashCode();
}
return false;
}
}
The Fluent NHibernate maps: Fluent NHibernate地图:
public class TestParentMap : ClassMap<TestParent>
{
public TestParentMap()
{
Table("TestParent");
Id(x => x.TestParentId).Column("TestParentId").GeneratedBy.Native();
Map(x => x.FavoriteColor);
HasMany(x => x.TestChildList).KeyColumn("TestParentId").Inverse().Cascade.None();
}
}
public class TestChildMap : ClassMap<TestChild>
{
public TestChildMap()
{
Table("TestChild");
CompositeId()
.KeyProperty(x => x.ChildName, "ChildName")
.KeyReference(x => x.Parent, "TestParentId");
Map(x => x.Age);
References(x => x.Parent, "TestParentId"); /** breaks insert **/
}
}
When I try to add a new record, I get this error: 当我尝试添加新记录时,我收到此错误:
System.ArgumentOutOfRangeException : Index was out of range.
System.ArgumentOutOfRangeException:索引超出范围。 Must be non-negative and less than the size of the collection.
必须是非负数且小于集合的大小。 Parameter name: index
参数名称:index
I know this error is due to the TestParentId column being mapped in the CompositeId and References calls. 我知道这个错误是由于在CompositeId和References调用中映射了TestParentId列。 However, removing the References call causes another error when querying TestChild based on the TestParentId.
但是,在基于TestParentId查询TestChild时,删除References调用会导致另一个错误。
Here's the code that does the queries: 这是执行查询的代码:
var session = _sessionBuilder.GetSession();
using (var tx = session.BeginTransaction())
{
// create parent
var p = new TestParent() { FavoriteColor = "Red" };
session.Save(p);
// creat child
var c = new TestChild()
{
ChildName = "First child",
Parent = p,
Age = 4
};
session.Save(c); // breaks with References call in TestChildMap
tx.Commit();
}
// breaks without the References call in TestChildMap
var children = _sessionBuilder.GetSession().CreateCriteria<TestChild>()
.CreateAlias("Parent", "p")
.Add(Restrictions.Eq("p.TestParentId", 1))
.List<TestChild>();
Any ideas on how to create a composite key for this scenario? 有关如何为此方案创建组合键的任何想法?
I found a better solution that will allow querying and inserting. 我找到了一个更好的解决方案,允许查询和插入。 The key is updating the map for TestChild to not insert records.
关键是更新TestChild的映射以不插入记录。 The new map is:
新地图是:
public class TestChildMap : ClassMap<TestChild>
{
public TestChildMap()
{
Table("TestChild");
CompositeId()
.KeyProperty(x => x.ChildName, "ChildName")
.KeyReference(x => x.Parent, "TestParentId");
Map(x => x.Age);
References(x => x.Parent, "TestParentId")
.Not.Insert(); // will avoid "Index was out of range" error on insert
}
}
Any reason you can't modify your query to just be 您无法修改查询的任何原因
_sessionBuilder.GetSession().CreateCriteria<TestChild>()
.Add(Restrictions.Eq("Parent.TestParentId", 1))
.List<TestChild>()
Then get rid of the reference? 然后摆脱参考?
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