Develop Reference

NHibernate Envers - how to audit revisions on a separate database?

I'm using Nhibernate Envers and I want Envers to save audit info on a separate database to keep things cleaner/more maintainable.
I'm using this fluent configuration:
var enversCfg = new NHibernate.Envers.Configuration.Fluent.FluentConfiguration()
enversCfg.Audit(GetDomainEntities())
nhCfg.SetEnversProperty(ConfigurationKey.DefaultCatalog, "nhibernate_testAU")
but when I try to create the schema, I get a HibernateException (The specified schema name "nhibernate_testAU" either does not exist or you do not have permission to use it.)
for what it's worth, my backend is SQL Server 2005

In addition to actually creating the database, I specified the schema to "dbo".
c.SetEnversProperty(ConfigurationKey.DefaultSchema, "dbo");
c.SetEnversProperty(ConfigurationKey.DefaultCatalog, "MyCatalog_Audit");
Also, I have my own RevistionEntity class, so, I needed to add the catalog and schema to my hbm.
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MyAssembly" namespace="MyNamespace">
<class name="MyRevisionEntity" table="REVINFO" catalog="MyCatalog_Audit" schema="dbo">
<id name="Id" column="MyRevisionEntityId">
<generator class="identity"/>
</id>
<property name="AuditDate"></property>
<property name="UserName"></property>
<!--modifiedEntityNames-->
<set name="ModifiedEntityNames" table="REVCHANGES" catalog="MyCatalog_Audit" schema="dbo">
<key column="REV"/>
<element column="ENTITYNAME" type="string"/>
</set>
</class>
</hibernate-mapping>
HTH
Chuck

You need to manually create the catalog/database. AFAIK - NH's SchemaExport don't create database/catalog (or schemas) for you.

NHibernate - No Class Mappings

Why don't I have any class mappings after calling Configuration.Configure()?
Here is my class mapping file Category.hbm.xml for BudgetModel.Category:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="BudgetModel" namespace="BudgetModel">
<class name="Category" table="Categories">
<id name="Id" type="Int32">
<generator class="native" />
</id>
<property name="Name" type="string" not-null="true" />
</class>
</hibernate-mapping>
EDIT
NH version is 2.1.1.GA
Category.hbm.xml is an embedded resource & I have rebuilt.

You need to tell NHibernate where your mapping files are. You normally do this either programmatically or in the configuration file.
config.AddAssembly(typeof(Category).Assembly);
or
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory>
<!--Configuration Properties-->
<mapping assembly="BudgetModel" />
</session-factory>
</hibernate-configuration>
Also, your hibernate mapping file must be set with a build action of embedded resource.

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>

How to use a child object field as part of the compound key in another child in NHibernate

I need to create a new Many-To-One relationship on my User entity which joins against another entity. The problem is the other entity has a compound key of which 1 field is a field in the User entity and the other is a field in another Many-To-One entity.
User.Key -> User.NewThing.Key
User.SubThing.Key -> User.NewThing.Key
Below is the invalid mapping file I am ideally wanting to use where JeanieUserTyped is my newthing and the ApplicationId is the key in question which comes from ShortCode.ApplicationId.
Question is how do I tell it to map the application part of the compound key?
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="JeanieMaster.Domain.Entities" assembly="JeanieMaster.Domain">
<class name="JeanieUser" table="DBSVR1.Jeanie_Master.dbo.JeanieUser" select-before-update="false" optimistic-lock="none">
<id name="Id" column="UserId" type="Int32">
<generator class="identity"/>
</id>
<property name="Mobile" type="String"/>
<property name="UniqueReoccurBillingRefId" type="String"/>
<property name="DateJoined" type="DateTime"/>
<property name="IsActive" type="Boolean"/>
<many-to-one name="MobileNetwork" class="MobileNetwork" column="MobileNetworkId" />
<many-to-one name="ShortCode" class="ShortCode" column="ShortCodeId" />
<many-to-one name="MobileHandset" class="MobileHandset" column="HandsetId" />
<many-to-one name="JeanieUserTyped" class="JeanieUserTyped">
<column name="Mobile" />
<column name="ApplicationId" />
</many-to-one>
</class>
</hibernate-mapping>

Can you give more details, sounds like you have 3 entities,
User
SubThing
NewThing
Where NewThing resolves a Many-to-Many with User and SubThing - am I close?
Maybe like this:
User -< SubThing
| |
/\ /\
NewThing
I don't suppose the composite key stuff in nhibernate is relevant?