NHibernate-更新代码示例 [英] NHibernate - code example for update

问题描述

我一直在整天试图将我的对象之一保存为版本，但无济于事.请指出我在做错什么，因为在Clear()调用之后尝试了SaveOrUpdate，Merge()和Update().

I've been trying all day to get one of my object to be saved with versions but to no avail. Please point out what I'm doing wrong, as I've tried SaveOrUpdate, Merge() and Update() after a Clear() call.

业务对象:

 public class MappedTest  
{  
    public virtual Guid TestID { get; set; }  
    public virtual int VersionID { get; set; }  
    public virtual byte[] Content { get; set;}  
    public virtual DateTime DateSaved { get; set; }  
}  

映射:

<?xml version="1.0" encoding="utf-8" ?>  
<hibernate-mapping ...>  
 <class name="TestImp.Definition.MappedTest, PythonTest" table="Tests">  
  <id name="TestID" unsaved-value="00000000-0000-0000-0000-000000000000">  
  <generator class="guid"/>  
</id>  
<version name="VersionID" column="VersionID" />  
<property name="Content" column="TestObject" type="BinaryBlob"/>  
<property name="DateSaved" column="Date"/>  

实际代码:

using (var session = new Configuration().Configure().BuildSessionFactory().OpenSession())  
        {  
            using (ITransaction transaction = session.BeginTransaction())  
            {  
                if(session.Get<MappedTest>(mappedTest.TestID) == null)  
                {  
                    session.Save(mappedTest);  
                }  
                else  
                {  
                session.Clear();  
                    session.Update(mappedTest);  
                }  
                transaction.Commit();  
            }  
        }`  

谢谢.

推荐答案

对于插入，请尝试使用:

For insert try just with:

using (var session = new Configuration().Configure().BuildSessionFactory().OpenSession())  
    {  
        MappedTest mappedTest =new MappedTest();

        using (ITransaction transaction = session.BeginTransaction())  
        {  
            session.SaveOrUpdate(mappedTest);  
            transaction.Commit();  
        }  
    }  

用于更新:

using (var session = new Configuration().Configure().BuildSessionFactory().OpenSession())  
    {  
        MappedTest mappedTest =session.Get<MappedTest>(..an Id..);
        mappedTest.YourProperty="newValue";

        using (ITransaction transaction = session.BeginTransaction())  
        {  
            session.SaveOrUpdate(mappedTest);  
            transaction.Commit();  
        }  
    }  

如果需要，请尝试使用session.Flush()强制执行数据库操作.

If you need it try use a session.Flush() to force database operations.

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