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• Maintain integrity in NHibernate bidirectional association

  Using Bidirectional Associations in nhibernate can be tricky, the problem is that you need to manage associations for both ends. This is really important: suppose you have a class called Parent with a collection of childs called Childs, and a child class... Posted May 05 2009, 06:38 AM by Alkampfer's Place Filed under: Nhibernate, Software Architecture

• NHibernate ICriteria and composite-id with key-many-to-one

  Suppose you have a legacy database, and an entity called ViewOfBaseData that have this id. <composite-id class="ViewOfBaseDataId" name="Id" > <key-many-to-one class="LinkResult" name="Link" column="AnalysisId"... Posted Apr 29 2009, 10:29 AM by Alkampfer's Place Filed under: Nhibernate

• NHibernate “null identifier” error

  Today I received a strange “null identifier” error when saving an object to db with nhibernate. Immediatly I realize that this error is caused by a Trigger INSTEAD OF INSERT, that apperars to broke the SCOPE_IDENTITY() function. Since NHibernate uses... Posted Apr 02 2009, 09:48 AM by Alkampfer's Place Filed under: Nhibernate

• Querying NHibernate user type with HQL or criteria

  Some time ago I posted a link about a user type to store list of strings in a single database field. In a project of mine I have another usertype very similar, that stores list of integers into a single string database field in a # separated value, like... Posted Mar 31 2009, 05:08 AM by Alkampfer's Place Filed under: Nhibernate

• NHibernate and TooManyRowsAffectedException

  Today I received a log of an error in a windows service that runs some scheduled actions, the error was TooManyRowsAffectedException and it is thrown by nhibernate when a session is flushed. The exact message said Unexpected row count: 2; expected: 1... Posted Mar 25 2009, 02:42 AM by Alkampfer's Place Filed under: Nhibernate

• NHibernate: how to give a name to your Primary Key using SchemaExport (in SQL Server/ SQL Express)

  If in your project, you let NHibernate generate the database from the information you provide with the schema mappings (a thing extremely useful, especially for testing cause you can build up the database in engines like SQLite)… mmm…where... Posted Mar 20 2009, 07:09 AM by Guardian's Home Filed under: Nhibernate, Primary Key, Name

• Wrap IList<T> and use it for effective binding in Silverlight and WPF

  If you use some ORM tool like NHibernate and your business entities or DTOs have to support collections of other elements, you are forced to use the interface notation IList<T> or ICollection<T> to hold a reference to the real collection... Posted Nov 24 2008, 05:05 AM by Guardian's Home Filed under: Nhibernate, WPF, Silverlight, .NET, Tips, collections, binding

• Improving the WCF logger

  One of the first improvement to the WCF logger is the ability to choose the list of logger to monitor during registration. A real application can generate tons of logs, suppose you are interested only in looking at the NHibernate generated query. The... Posted Nov 06 2008, 12:35 AM by Alkampfer's Place Filed under: Nhibernate, .NET framework

• NHibernate: how to control Delete Rule and Update Rule in a foreign key when using SchemaExport

  If in your project you let NHibernate generate the database from the information you provide with the schema mappings (a thing extremely useful, especially for testing cause you can build up the database in engines like SQLite), sometimes you may need... Posted Oct 25 2008, 02:31 AM by Guardian's Home Filed under: Nhibernate, Tips, delete rule, update rule, foreign key

• Inspecting NHibernate Metadata

  I have a little project based on NSK, it uses a query model to abstract the caller from nhibernate. Despite the reason for having or not a Query Model, I expanded the base translator to translate my Query object into a NHIbernate ICriteria. To make this... Posted Aug 12 2008, 05:04 AM by Alkampfer's Place Filed under: Nhibernate

• NHibernate and deleting a group of objects

  If you do not mind to issue a delete for each object, you can delete multiple objects using an overload version of the ISession.Delete() Method, here is an example. uow.Session.Delete("select A from ActionSpawned A where A.ParentAction = :act"... Posted Jun 19 2008, 08:45 AM by Alkampfer's Place Filed under: Nhibernate

• Second IUserType of the day - Store a list of string in database with NHIbernate.

  I have an object that has 4 properties of IList<String> type. You can natively map these properties in a separate table with this simple mapping <bag name="keys" access="field" cascade="all-delete-orphan" table="Keys"... Posted May 30 2008, 08:54 AM by Alkampfer's Place Filed under: Nhibernate

• Today Menu: NHibernate User Type

  Ok, today I faced a really simple problem, I have a domain class with a property of type uri, that seems to be not natively supported by NHibernate. Whenever you face a problem of this type the solution is IUserType, here is the full file, it is so simple... Posted May 30 2008, 08:20 AM by Alkampfer's Place Filed under: Nhibernate

• NHIbernate and "collection was not an association" when using bag and composite-element

  Look at this mapping <bag name="searchDefinition" access="field" cascade="all-delete-orphan" table="RawSearchDefinition" fetch="join"> <key column="ParentObjectId" /> <composite-element... Posted May 20 2008, 06:28 AM by Alkampfer's Place Filed under: Nhibernate

• Mapping a boolean field to char in nhibernate

  When you work with legacy database is not infrequent that boolean value are mapped to char(1) field in databse, with Y/N or 0/1 or some other chars. In the literature there are a lot of solution, you can find for example a discussion here. When you use... Posted May 08 2008, 03:51 AM by Alkampfer's Place Filed under: Nhibernate