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NHibernate级联（一对多） 子表添加数据失败

1
悬赏园豆：20 [已关闭问题] 关闭于 2011-12-02 17:41

有2个表 WorkForm（one）和WorkFormDetail（many）

用NH插入数据的时候无法将数据插入WorkFormDetail

1.WorkForm映射文件

 

WorkForm.hbm.xml 
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly ="Test.Domain" namespace="Test.Domain.Entities">
  <class name="WorkForm" table="WorkForm">
    <id name="WorkFormId" column="WorkFormId" type="Int32" unsaved-value="0">
      <generator class="native"/>
    </id>
    <property name="Title" column="Title" type="string" length="100" not-null="true"/>
    <property name="Content" column="[Content]" type="string" length="500" not-null="true"/>
    <set generic="true" inverse="true" name="WorkFormDetails" table="WorkFormDetail">
      <key column="WorkFormId" foreign-key="FK_WorkFormDetail_WorkForm"/>
      <one-to-many class="Test.Domain.Entities.WorkFormDetail"/>
    </set>
  </class>
</hibernate-mapping>

 

2.WorkFormDetail映射文件

 

WorkFormDetail.hbm.xml 
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly ="Test.Domain" namespace="Test.Domain.Entities">
  <class name="WorkFormDetail" table="WorkFormDetail">
    <id name="FormDetailId" column="FormDetailId" type="Int32" unsaved-value="0">
      <generator class="native"/>
    </id>
    <property name="Title" column="Title" type="string" length="100" not-null="true"/>
    <property name="Content" column="[Content]" type="string" length="500" not-null="true"/>
    <many-to-one foreign-key="FK_WorkFormDetail_WorkForm" class="Test.Domain.Entities.WorkForm" 
                 column="WorkFormId" name="WorkForm"/>
  </class>
</hibernate-mapping>

3.WorkForm持久类

WorkForm.cs 
public class WorkForm
    {
        private ISet<WorkFormDetail> _workFormDetails = new HashedSet<WorkFormDetail>();
        public virtual int WorkFormId { get; set; }

        public virtual string Title { get; set; }

        public virtual string Content { get; set; }

        public virtual ISet<WorkFormDetail> WorkFormDetails
        {
            get
            {
                return _workFormDetails;
            }
            set
            {
                _workFormDetails = value;
            }
        }
    }

4.WorkFormDetail持久类

WorkFormDetail.cs 
public class WorkFormDetail
    {
        public virtual int FormDetailId { get; set; }

        public virtual string Title { get; set; }

        public virtual string Content { get; set; }

        public virtual WorkForm WorkForm { get; set; }
    }

5.问题来了，下面是插入数据的代码

插入数据的问题代码 
protected void Submit_Click(object sender, EventArgs e)
    {
        string pTitle = txtTitle.Text.Trim();
        string pContent = txtContent.Text.Trim();

        string cTitle = txtCTitle.Text.Trim();
        string cContent = txtCContent.Text.Trim();

        WorkForm wf = new WorkForm();
        wf.Title = pTitle;
        wf.Content = pContent;

        WorkFormDetail wfd = new WorkFormDetail();
        wfd.Title = cTitle;
        wfd.Content = cContent;
        wfd.WorkForm = wf;

        wf.WorkFormDetails.Add(wfd);

        try
        {
            _session.Save(wf);
            _session.Flush();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message, ex);
        }
    }

希望有人帮忙看下,一大早上碰到这问题，很纠结...




Kratos Zhang的主页 Kratos Zhang | 初学一级 | 园豆：6
提问于：2011-10-15 11:28
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所有回答(3)
0

我的也不行 ，先留个足，解决了告知一下....

H-man | 园豆：205 (菜鸟二级) | 2011-10-18 00:43

嗨你的可以了吗，我的还是不行，是咋回事了

支持(0) 反对(0) 琪琪玉笨笨猪 | 园豆：200 (初学一级) | 2013-11-08 10:30
0

在WorkForm类中添加以下方法：

        ///<summary>
        /// 增加一个工作单明细
        ///</summary>
        ///<param name="wf"></param>
        public virtual void AddWorkFormDetails(WorkFormDetail wf)
        {
            this.WorkFormDetails.Add(wf);
            wf.WorkForm = this;
        }

难道这个方法一定要是virtual的吗？去掉virtual关键字就报错.

然后逻辑代码中

            WorkForm wf = new WorkForm();
            wf.Title = "title";
            wf.Content = "content";

            WorkFormDetail wfd = new WorkFormDetail();
            wfd.Title = "child title";
            wfd.Content = "chile content";

            wf.AddWorkFormDetails(wfd);
            _session.save(wf);

这样可以级联添加了，怎么感觉和之前的没什么差别呢，但是有添加成功了。。。

Kratos Zhang | 园豆：6 (初学一级) | 2011-10-20 14:38

嗨你的可以了吗，我的还是不行，是咋回事了

支持(0) 反对(0) 琪琪玉笨笨猪 | 园豆：200 (初学一级) | 2013-11-08 13:36

其实没有必要写那个virtual方法，只要把WorkForm.hbm.xml文件中set节点中的inverse="true"换成cascade="all"就可以了，其他的都不需要修改……

支持(0) 反对(0) 谭一丹 | 园豆：200 (初学一级) | 2013-11-28 13:45
0 
 public class Order
    {

        public Order()
        {
            this.Items = new Iesi.Collections.Generic.HashedSet<OrderItem>();
            
            //it is ok too
            //this.Items = new List<OrderItem>();
        }

        public virtual Guid ID { get; set; }

        public virtual Iesi.Collections.Generic.ISet<OrderItem> Items { get; set; }
        
        //it is ok too
        //public virtual ICollection<OrderItem> Items { get; set; }

        //public virtual Customer Customer { get; set; }

        public virtual DateTime CreateTime { get; set; }
        public virtual DateTime ModifyTime { get; set; }

        public virtual int Version { get; set; }

        public virtual void AddItem(int amount)
        {
            var now = DateTime.Now;
            var item = new OrderItem() { CreateTime = now, ModifyTime = now, Amount = amount, Order = this };
            this.Items.Add(item);
        }
    }

OrderItem

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Com.Andyshi.NH3.Domain
{
    public class OrderItem
    {
       
        public virtual int Amount { get; set; }

        public virtual Order Order { get; set; }

        //public virtual int Version { get; set; }
        public virtual DateTime CreateTime { get; set; }
        public virtual DateTime ModifyTime { get; set; }

        public override bool Equals(object obj)
        {
            var item = obj as OrderItem;
            return this.Amount == item.Amount
                && this.CreateTime == item.CreateTime
                && this.ModifyTime == item.ModifyTime;
        }
        public override int GetHashCode()
        {
            return base.GetHashCode();
        }
    }
}

Order.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                  assembly="Com.Andyshi.NH3"
                   namespace="Com.Andyshi.NH3.Domain">
  <class name="Order" table="Orders" 
         optimistic-lock="version">
    <id name="ID">
      <generator class="guid"></generator>
    </id>
    <version name="Version" unsaved-value="null"/>
    
    <property name="CreateTime"></property>
    <property name="ModifyTime"/>

    <set name="Items" generic="true" inverse="true" cascade="all" >
      <key column="OrderID" not-null="true"></key>
      <one-to-many class="OrderItem"/>
    </set>
           
  </class>
  
</hibernate-mapping>

OrderItem.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                  assembly="Com.Andyshi.NH3"
                   namespace="Com.Andyshi.NH3.Domain">
  <class name="OrderItem" table="OrderItems"
         optimistic-lock="version"  >
    <composite-id>
      <!--<version name="Version" unsaved-value="null"></version>-->
      <key-property name="Amount"></key-property>
      <key-property name="CreateTime"></key-property>
      <key-property name="ModifyTime"/>
    </composite-id>
    <many-to-one name="Order"
                 column="OrderID"
                 not-null="true"
                 class="Order"
                 ></many-to-one>

  </class>

</hibernate-mapping>

Repository

  public void Add(Order order)
        {
            using (var session = SessionManager.Instance.CreateSession())
            {
                using (var tran = session.BeginTransaction())
                {
                    session.Save(order);

                    tran.Commit();
                }
            }
        }

Test

[Test]
        public void test_add()
        {
            var now = DateTime.Now;
            var order = new Order()
            {
                CreateTime = now,
                ModifyTime = now
            };

            order.AddItem(100);
            order.AddItem(200);


            var repository = new OrderRepository();
            repository.Add(order);

            var orderindb = repository.Get(order.ID);

            Assert.IsNotNull(orderindb);
            
        }
Virus-BeautyCode | 园豆：1619 (小虾三级) | 2013-06-27 17:22
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