Develop Reference

ORA 01407 - Error - Cannot update to NULL

My problem is that i have two entities (Document and Attach) that has an relationship one-to-one. In my app, i can save first the Document and lately if i want, i can attach an archive to it, that will be on the table Attach.
The error occurs when i have an object Document already inserted in database and then i try to add an attach on it.
Below is the nhibernate mapping:
Document.hbm.xml
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="Sigre.Business"
namespace="Sigre.Business.BusinessEntity">
<class name="Document" lazy="false" table="grsds.documento_fcdr">
<id name="Code" type="int" unsaved-value="0" column="docf_sq_documento_fcdr">
<generator class="sequence">
<param name="sequence">grsds.sq_docf_sq_documento_fcdr</param>
</generator>
</id>
<property name="Nome" type="AnsiString" length="100" not-null="true" column="docf_nm_documento_fcdr" />
<many-to-one name="Manifest" class="TransportManifest" column="mtra_sq_manifesto_transporte" not-null="false" cascade="none" />
<many-to-one name="User" class="User" column="user_id" not-null="false" cascade="none" />
<set name="Attach" inverse="false" lazy="false" cascade="save-update">
<key column="docf_sq_documento_fcdr" />
<one-to-many class="Attach" />
</set>
</class>
</hibernate-mapping>
Attach.hbm.xml
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="Sigre.Business"
namespace="Sigre.Business.BusinessEntity">
<class name="Attach" lazy="false" table="grsds.espec_documento_fcdr">
<id name="Code" type="int" unsaved-value="0" column="docf_sq_documento_fcdr">
<generator class="foreign">
<param name="property">Document</param>
</generator>
</id>
<property name="Archive" column="esdf_mm_documento_fcdr" type="BinaryBlob" not-null="true" />
<one-to-one constrained="true" name="Document" access="property" />
</class>
</hibernate-mapping>
If i am inserting both Document and Attach together, it works. But when i have a Document created and try to insert an Attach, the following error occurs:
ORA-01407: cannot update ("GRSDS"."ESPEC_DOCUMENTO_FCDR"."DOCF_SQ_DOCUMENTO_FCDR") to NULL
What i tried:
1 - Save the Document having the attach to insert:
bmDocument.Save(document);

Ok i solved this question.
When i bring the object Document from database, the attribute Attach when has no Attach, come as an empty list: {}
When i tried to add an Attach to this Document, i was overwriting the reference, like this:
Document.Attach = new List() { new Attach() };
The solution was use the method Add of the list that was brought from the database:
Document.Attach.Add( new Attach() );

Need help with simple NHibernate mapping

Need help with a simple NHibernate relationship...
Tables/Classes
Request
-------
RequestId
Title
…
Keywords
-------
RequestID (key)
Keyword (key)
Request mapping file
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="CR.Model" assembly="CR">
<class name="CR.Model.Request, CR table="[dbo].[Request]" lazy="true">
<id name="Id" column="[RequestID]">
<generator class="native" />
</id>
<property name="RequestorID" column="[RequestorID]" />
<property name="RequestorOther" column="[RequestorOther]" />
…
Keyword??
</class>
</hibernate-mapping>
How do I simply map multiple keywords to a request? I don't need another mapping file for the keyword class, do I?
It's be great if I could not only get the associated keywords, but add them too...

You'll need a set (or some other kind of collection mapping, but I think a set is the best-fit).
check this

NHibernate save object, a column is null

the database has two table,one is mb_user table and other is mb_comment table。A user have some comments.When I insert a comment into mb_comment ,the comment_user_id of mb_comment is null.I can't save value of comment_user_id.Please help me!
Map file
mb_user Map file
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MiserBlogData" namespace="MiserBlogData.Entities" default-lazy="false">
<class name="A_Person" table="mb_user" discriminator-value="0">
<id name="Id" column ="user_id" >
<generator class ="native"/>
</id>
<discriminator column="user_role" type="int" />
<property name="State" column="user_state" />
<property name ="Name" column="user_name" />
<property name ="Pwd" column="user_pwd" />
<property name ="CDate" column="user_cdate" />
<property name ="UDate" column="user_udate" />
<property name ="Role" column="user_role" />
<property name ="Face" column="user_face" />
<bag name="CommentList" >
<key column="comment_user_id" foreign-key="FK_PersonComment" />
<one-to-many class="Comment" />
</bag>
</class>
</hibernate-mapping>
mb_comment Map file
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MiserBlogData" namespace="MiserBlogData.Entities">
<class name ="Comment" table="mb_comment">
<id name="Id" column ="comment_id">
<generator class ="native"/>
</id>
<property name ="ArticleId" column="comment_article_id" />
<property name ="Content" column="comment_content" />
<property name ="State" column="comment_state" />
<property name ="CDate" column="comment_cdate" />
<many-to-one name="Person" column="comment_user_id" class="A_Person" not-null="true" foreign-key="FK_PersonComment" />
</class>
</hibernate-mapping>
C# code
protected ISession _session = NHibernateHelper.GetCurrentSession();
public virtual object Save<T>(T obj) where T : class
{
return _session.Save(obj);
}
error :not-null property references a null or transient valueMiserBlogData.Entities.Comment.Person
I know,if I remove not-null="true" in mb_comment file ,system is good.But comment_user_id column is null.How to solve？

You should assign the property Person on your Comment to a valid A_Person instance. Then NHibernate will know which user id to write in the table.

How to map Image type in NHibernate?

I have at my SQL Server 2000 Database a column with type Image. How can I map it into NHibernate?

We used BinaryBlob on the mapping config file, and byte[] on the property.

Below is the sample code that i have used to map an image field. Where BlogImage was a column of Image Datatype mapped to byte type property BlogImage. length="2147483647" was used to ensure copy of full image in to database as nhibernate some times limit the max size of data that is going to be inserted.
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="EAS.MINDSPACE.Infrastructure.Business.Entities.BlogMaster,EAS.MINDSPACE.Infrastructure.Business.Entities" lazy="false" table="BlogMaster" schema="dbo" >
<id name="BlogId" column="BlogId">
<generator class="native" />
</id>
<property name="BlogData" column="BlogData" />
<property name="BlogImage" column="BlogImage" length="2147483647" />
<property name="UserId" column="UserId" />
<property name="CreatedByName" column="CreatedBy" />
<property name="CreatedOn" column="CreatedOn" />
<property name="ReplyCount" column="ReplyCount" />
</class>
</hibernate-mapping>

NHibernate 3.x does all the magic it self.
Sql:
Create table tblCompany (..., Logo image);
NHibernate-Mapping (important to set length!!!):
<class name="Company"
table="tblCompany">
...
<property name="_logo"
column="Logo"
not-null="false"
length="2147483647"
access="field" />
...
</class>
C#-Class:
public class Company {
...
private Image _logo;
...
}

NHibernate mapping of lookup collection (if that makes any sense)

I'm not sure how to ask the question, for I don't know what I don't know, and therefore I don't know the proper terminology for what I'm trying to get the answer to. I will explain my scenario, in hopes that it will help:
I've got three tables, a Book table, a Tag table and a BookTag lookup table.
Each book has an ID, a Title (for starters)
Each tag has an ID, and a Title
Each BookTag has an ID, a BookID, and a TagID.
A book can be tagged with multiple tags, and a tag can be used on more than one BookID.
I've got my objects setup in this fashion:
Book.cs
int BookID
string Title
List<BookTag> Tags
Tag.cs
int TagID
string Title
BookTag.cs
int ID
int BookID
int TagID
I would like the Books.cs class to have a collection of Tags, and not BookTags, but I cannot seem to get the mapping right in NHibernate. This is what I've got for the Book.hbm.xml file:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DomainModel" namespace="DomainModel.Books">
<class name="DomainModel.Books.Book" table="Books">
<id name="BookID" type="Int32" unsaved-value="0">
<generator class="native"/>
</id>
<property name="Title" type="String" not-null="true"/>
<set lazy="true" name="Tags" table="BookTags" generic="true" inverse="true" cascade="delete">
<key column="BookID"/>
<one-to-many class="DomainModel.Books.BookTag, DomainModel"/>
</set>
</class>
</hibernate-mapping>
And this is my BookTag.hbm.xml:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DomainModel" namespace="DomainModel.Books">
<class name="DomainModel.Books.BookTag" table="BookTags">
<id column="BookTagID" name="BookTagID" type="Int32" unsaved-value="0">
<generator class="native"/>
</id>
<many-to-one name="Tag">
<column not-null="true" name="TagID"/>
</many-to-one>
<many-to-one name="Book">
<column not-null="true" name="BookID"/>
</many-to-one>
</class>
</hibernate-mapping>
Under this model, I can get to the tag I want by using my object model: Book.Tags[0].Tag, but that just seems inefficient. Can I use NHibernate to map out the BookTags.TagID with the Tags.TagID in the database so that I can get Book.Tags[0] to return a Tag object, instead of a BookTags object? I didn't know of a better way to associate Books to tags so that a tag used on Book1 can be used on Book2 without adding a new entry to the Tags table.
I hope this makes at least some sense. Let me know if you need further clarification. I'll post my solution here if I figure it out before someone answers.

You don't need a BookTag class at all. You can map Book.Tags collection as many-to-many. To do this you will specify BookTag in the map to connect the association. Look here in section 6.8 Bidirectional Associations.

Thank you Tim, that was what I needed. For those that are curious, I "un-mapped" the BookTag table/objects, and now just have a Book object and a Tag object that are used and mapped to NHibernate.
My Book.hbm.xml was updated to this:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DomainModel" namespace="DomainModel.Books">
<class name="DomainModel.Books.Book" table="Books">
<id name="BookID" type="Int32" unsaved-value="0">
<generator class="native"/>
</id>
<property name="Title" type="String" not-null="true"/>
<bag name="Tags" table="BookTag" generic="true">
<key column="BookID" on-delete="noaction"></key>
<many-to-many class="Tag" column="TagID"></many-to-many>
</bag>
</class>
</hibernate-mapping>