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为了让自己清楚，我创建了一个最基本的案例来描述我的问题。假设我有3个表格：NHibernate实体复合标识保存问题
CREATE TABLE [dbo].[Product](
[ProductID] [int] IDENTITY(1,1) NOT NULL,
[ProductName] [varchar](50) NOT NULL,
CONSTRAINT [PK_Product] PRIMARY KEY CLUSTERED ([ProductID] ASC)
) ON [PRIMARY]
CREATE TABLE [dbo].[OrderHeader](
[HeaderID] [int] IDENTITY(1,1) NOT NULL,
[Comment] [varchar](100) NULL,
CONSTRAINT [PK_OrderHeader] PRIMARY KEY CLUSTERED ([HeaderID] ASC)
) ON [PRIMARY]
CREATE TABLE [dbo].[OrderDetail](
[HeaderID] [int] NOT NULL, /* FK to OrderHeader table */
[ProductID] [int] NOT NULL, /* FK to Product table */
[CreatedOn] [datetime] NOT NULL,
CONSTRAINT [PK_OrderDetail] PRIMARY KEY CLUSTERED
(
[HeaderID] ASC,
[ProductID] ASC
)
) ON [PRIMARY]
而且我创建了相应的实体类和映射类。
public class Product {
public virtual int? Id { get; set; }
public virtual string Name { get; set; }
}
public class ProductMap : ClassMap<Product> {
public ProductMap() {
Table("Product");
Id(x => x.Id, "ProductID").GeneratedBy.Identity();
Map(x => x.Name, "ProductName");
}
}
public class OrderHeader {
public virtual int? Id { get; set; }
public virtual string Comment { get; set; }
public virtual IList<OrderDetail> Details { get; set; }
}
public class OrderHeaderMap : ClassMap<OrderHeader> {
public OrderHeaderMap() {
Table("OrderHeader");
Id(x => x.Id, "HeaderID").GeneratedBy.Identity();
Map(x => x.Comment, "Comment");
HasMany<OrderDetail>(x => x.Details)
.KeyColumn("HeaderID")
.Inverse()
.Cascade
.All();
}
}
public class OrderDetail {
public virtual OrderHeader OrderHeader { get; set; }
public virtual Product Product { get; set; }
public virtual DateTime? CreatedOn { get; set; }
public override bool Equals(object obj) {
OrderDetail other = obj as OrderDetail;
if (other == null) {
return false;
} else {
return this.Product.Id == other.Product.Id && this.OrderHeader.Id == other.OrderHeader.Id;
}
}
public override int GetHashCode() {
return (OrderHeader.Id.ToString() + "|" + Product.Id.ToString()).GetHashCode();
}
}
public class OrderDetailMap : ClassMap<OrderDetail> {
public OrderDetailMap() {
Table("OrderDetail");
CompositeId()
.KeyReference(x => x.Product, "ProductID")
.KeyReference(x => x.OrderHeader, "HeaderID");
References<OrderHeader>(x => x.OrderHeader, "HeaderID").ForeignKey().Not.Nullable().Fetch.Join();
References<Product>(x => x.Product, "ProductID").ForeignKey().Not.Nullable();
Version(x => x.CreatedOn).Column("CreatedOn").Generated.Always();
}
}
我也创建NH会话提供
public class NHibernateSessionProvider {
private static ISessionFactory sessionFactory;
public static ISessionFactory SessionFactory {
get {
if (sessionFactory == null) {
sessionFactory = createSessionFactory();
}
return sessionFactory;
}
}
private static ISessionFactory createSessionFactory() {
return Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008.ShowSql()
.ConnectionString(c => c.FromConnectionStringWithKey("TestDB")))
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<OrderHeaderMap>())
.BuildSessionFactory();
}
}
而且一NH仓储类还创建
public class NHibernateRepository<T, TId> {
protected ISession session = null;
protected ITransaction transaction = null;
public NHibernateRepository() {
this.session = NHibernateSessionProvider.SessionFactory.OpenSession();
}
public void Save(T entity) {
session.SaveOrUpdate(entity);
}
public void AddNew(T entity) {
session.Save(entity);
}
public void BeginTransaction() {
transaction = session.BeginTransaction();
}
public void CommitTransaction() {
transaction.Commit();
closeTransaction();
}
public void RollbackTransaction() {
transaction.Rollback();
closeTransaction();
closeSession();
}
private void closeTransaction() {
transaction.Dispose();
transaction = null;
}
private void closeSession() {
session.Close();
session.Dispose();
session = null;
}
public void Dispose() {
if (transaction != null) {
CommitTransaction();
}
if (session != null) {
session.Flush();
closeSession();
}
}
}
在我的代码，我已经创建了两种不同的方式来保存这个主/复合标识的详细结构。
private static void method1() {
NHibernateRepository<Product, int?> repoProduct = new NHibernateRepository<Product, int?>();
NHibernateRepository<OrderHeader, int?> repo = new NHibernateRepository<OrderHeader, int?>();
OrderHeader oh = new OrderHeader();
oh.Comment = "Test Comment " + DateTime.Now.ToString();
oh.Details = new List<OrderDetail>();
for (int i = 0; i < 2; i++) {
oh.Details.Add(new OrderDetail
{
OrderHeader = oh,
Product = repoProduct.GetById(i + 3)
});
}
repo.AddNew(oh);
}
private static void method2() {
NHibernateRepository<OrderHeader, int?> repoHeader = new NHibernateRepository<OrderHeader, int?>();
OrderHeader oh = new OrderHeader();
oh.Comment = "Test Comment " + DateTime.Now.ToString();
repoHeader.Save(oh);
NHibernateRepository<OrderDetail, int?> repoDetail = new NHibernateRepository<OrderDetail, int?>();
for (int i = 0; i < 2; i++) {
OrderDetail od = new OrderDetail
{
OrderHeaderId = oh.Id,
OrderHeader = oh,
ProductId = i + 3,
Product = new Product
{
Id = i + 3
},
};
repoDetail.AddNew(od);
}
}
但是，对于这两种方法，OrderDetail表从不保存。我已经打开ShowSql（）来查看在控制台上执行的SQL语句，没有生成SQL来保存OrderDetail表。
我到处搜索了很多搜索，无法得出清楚的结论。
任何人都有一些线索，我需要做什么来保存一个实体复合ID？
感谢
哈迪
我试过了，它仍然不会针对我的OrderDetail表生成插入语句。 – hardywang 2011-03-29 13:44:30
@hardywang：查看添加的示例。你的代码也有几个问题。 – 2011-03-29 14:30:19
@Diego，我已经更新了原始帖子中的代码来结合您的建议，我仍然无法获得保存的OrderDetail，根本没有生成SQL语句。 – hardywang 2011-03-29 17:32:09