[英]SQL 2008 HierarchyID support in NHibernate
我已经给了Needles的答案了。 这是一个非常好的答案,但需要进行一些更改才能使其正常运行(至少在.NET 4中)。 以下是我为项目提出的建议:
更新:以下代码可以在GitHub下载,并将在那里更新。 NHiberntate.HierarchyId.UserType
SqlHierarchyId IUserType
namespace NHibernate.UserTypes
{
using SqlTypes;
using System;
using System.Data;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Types;
public class HierarchyId : IUserType
{
#region Properties
public SqlType[] SqlTypes
{
get { return new[] { NHibernateUtil.String.SqlType }; }
}
public Type ReturnedType
{
get { return typeof(SqlHierarchyId); }
}
public bool IsMutable
{
get { return true; }
}
#endregion Properties
#region Methods
new public bool Equals(object x, object y)
{
if (ReferenceEquals(x, y)) return true;
if (x == null || y == null) return false;
return x.Equals(y);
}
public int GetHashCode(object x)
{
return x.GetHashCode();
}
public object NullSafeGet(IDataReader rs, string[] names, object owner)
{
object prop1 = NHibernateUtil.String.NullSafeGet(rs, names[0]);
if (prop1 == null) return null;
return SqlHierarchyId.Parse(new SqlString(prop1.ToString()));
}
public void NullSafeSet(IDbCommand cmd, object value, int index)
{
if (value == null)
((IDataParameter)cmd.Parameters[index]).Value = DBNull.Value;
else if (value is SqlHierarchyId)
((IDataParameter)cmd.Parameters[index]).Value = ((SqlHierarchyId)value).ToString();
}
public object DeepCopy(object value)
{
if (value == null) return null;
return SqlHierarchyId.Parse(((SqlHierarchyId)value).ToString());
}
public object Replace(object original, object target, object owner)
{
return DeepCopy(original);
}
public object Assemble(object cached, object owner)
{
return DeepCopy(cached);
}
public object Disassemble(object value)
{
return DeepCopy(value);
}
#endregion Methods
}
}
制图
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataLayer" namespace="NHibernate.Map">
<class name="NHibernate.Map.OrganizationUnit, DataLayer" table="`orgunit`">
<property name="HierarchyId" column="`ou_hid`" type="NHibernate.UserTypes.HierarchyId, DataLayer" />
...
</class>
</hibernate-mapping>
具有HierarchyId的对象
namespace NHibernate.Map
{
using Microsoft.SqlServer.Types;
public class OrganizationUnit
{
#region Fields
private SqlHierarchyId _hierarchyId;
...
#endregion Fields
#region Properties
public virtual SqlHierarchyId HierarchyId
{
get { return _hierarchyId; }
set { _hierarchyId = value; }
}
...
#endregion Properties
}
}
免责声明:我不是NHibernate专家,但是,我们正在将Fluent用于即将开展的使用SQL Server 2008 R2和Hierarchy ID的项目中。 下面的代码是我们目前在开发环境中使用的代码,并未经过充分测试/改进。 我从其他地方复制了大部分代码(对不起,我丢失了链接!)
您需要创建用户定义类型,然后在映射中使用它。 下面的映射是Fluent,我不知道如何使用ActiveRecord,但我猜它应该是类似的!
用户定义的类型
namespace YourNamespace {
public class SqlHierarchyIdUserType : IUserType {
public bool Equals(object x, object y) {
if(ReferenceEquals(x, y))
return true;
if(x == null || y == null)
return false;
return x.Equals(y);
}
public int GetHashCode(object x) {
return x.GetHashCode();
}
public object NullSafeGet(IDataReader rs, string[] names, object owner) {
object prop1 = NHibernateUtil.String.NullSafeGet(rs, names[0]);
if(prop1 == null)
return null;
return SqlHierarchyId.Parse(new SqlString(prop1.ToString()));
}
public void NullSafeSet(IDbCommand cmd, object value, int index) {
if(value == null) {
((IDataParameter)cmd.Parameters[index]).Value = DBNull.Value;
} else {
if(value is SqlHierarchyId) {
SqlHierarchyId hId = (SqlHierarchyId)value;
((IDataParameter)cmd.Parameters[index]).Value = hId.ToString();
}
}
}
public object DeepCopy(object value) {
if(value == null)
return null;
var sourceTarget = (SqlHierarchyId)value;
SqlHierarchyId copy = SqlHierarchyId.Parse(sourceTarget.ToString());
return copy;
}
public object Replace(object original, object target, object owner) {
return DeepCopy(original);
}
public object Assemble(object cached, object owner) {
return DeepCopy(cached);
}
public object Disassemble(object value) {
return DeepCopy(value);
}
public SqlType[] SqlTypes {
get { return new[] { NHibernateUtil.String.SqlType }; }
}
public Type ReturnedType {
get { return typeof(SqlHierarchyId); }
}
public bool IsMutable {
get { return true; }
}
}
}
流畅的映射
Map(e => e.YourSqlHierarchyIdProperty)
.Column("YourSqlHierarchyIdFieldName")
.CustomType<SqlHierarchyIdUserType>();
阅读这篇文章:
Castle ActiveRecord:在C#中映射到IUserType wihtin类
ActiveRecord使用[Property]属性来映射用户定义的类型。 所以对你来说它看起来像这样:
public class YourDataObject {
[Property(ColumnType="YourNamespace.SqlHierarchyIdUserType, YourNamespace")
public virtual SqlHierarchyId YourSqlHierarchyIdProperty;
}
希望能帮助到你!
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