为什么 NHibernate 会自动截断而不是在保存时抛出异常？

发布于 2024-09-14 14:58:02 字数 1319 浏览 1 评论 0原文

我一直在学习 NHibernate 教程的夏季课程，当我完成第 04 节：探索事务和并发时（就像在教程中一样），我想创建一个 SAVE 测试，该测试应该因无效对象而失败。

目的是测试是否可以正常回滚事务。

想法是创建一个无效对象，该对象的属性的字符数多于 Db 设置的所需数量。但是NHibernate所做的是它获取第一个所需数量的字符并剪切其余的字符并将其成功保存到Db中。

这是我的测试，它不会失败：

   [Test]
public void AddCountryThrowExceptionOnFail()
{
    // This returns a Country with country code having more than 50 chars 
    // Where its length is set to 3 chars only          
    Country invalidCountry = GetInvalidCountry();
    _dataProvider.AddCountry(invalidCountry);
}

这是 AddCountry 方法：

public int AddCountry(Country country)
{
using (ISession session = GetSession())
{
    using (ITransaction tx = session.BeginTransaction())
    {
        try
        {
            int pk_Country = (int)session.Save(country);
            session.Flush();

            tx.Commit();

            return pk_Country;
        }
        catch(Exception)
        {
            tx.Rollback();
            throw;
        }
    }
}
}

这就是为 CountryCode 属性设置映射文件的方式：

<property name="CountryCode" column="CountryCode" type="string" length="3" not-null="true"></property>

那么，问题是，为什么 NHibernate 会获取映射文件中设置的 n=length 的前 N 个字符？如何防止这种情况发生，以免保存失败？

谢谢，布拉克·奥斯多安

原文

I have been studying the Summer Of NHibernate Tutorials and when I have reached the Session 04: Exploring Transactions and Concurrency -just like in the tutorial- I wanted to create a SAVE test which should fail because of an invalid object.

The purpose is to test if it can rollback the transaction properly.

Idea is to create an invalid object that has a property with more chars than the required amount set by Db. But what NHibernate does is it gets the first required amount of chars and cuts the rest and saves it into Db successfully.

Here is my Test which does not fail:

   [Test]
public void AddCountryThrowExceptionOnFail()
{
    // This returns a Country with country code having more than 50 chars 
    // Where its length is set to 3 chars only          
    Country invalidCountry = GetInvalidCountry();
    _dataProvider.AddCountry(invalidCountry);
}

This is the AddCountry method:

public int AddCountry(Country country)
{
using (ISession session = GetSession())
{
    using (ITransaction tx = session.BeginTransaction())
    {
        try
        {
            int pk_Country = (int)session.Save(country);
            session.Flush();

            tx.Commit();

            return pk_Country;
        }
        catch(Exception)
        {
            tx.Rollback();
            throw;
        }
    }
}
}

And this is how the mapping file is set for CountryCode property:

<property name="CountryCode" column="CountryCode" type="string" length="3" not-null="true"></property>

So, question is, why NHibernate gets the first N chars where n=length set in the mapping file? How can I prevent this to happen so that it can fail on save?

Thanks,
burak ozdogan

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