Contribute to FluentNHibernate/fluent-nhibernate development by creating an read through our API documentation, or just see what’s available for reading in. i would advice to use some kind of IDE which is capable of autoresolve the namespaces (Visual Studio, Sharpdevelop, ) then you only need to copy paste the. Visual Studio sample solution containing the code using Fluent NHibernate which documentation on how to achieve certain goals with Fluent NHibernate.
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Fluent mapping is the namesake mapping style that Fluent NHibernate uses. Going with the same example as above, this time we’re mapping the author side which joins into the books table returning a collection of any books of that author.
For illustrative purposes we’ll be mapping the relationship between a book and it’s author. There are two strategies for mapping inheritance hierarchies in Fluent NHibernate, table-per-class-hierarchy and table-per-subclass; the former being a subclass, and the latter a joined-subclass.
The main difference in this lower scope is that you have to use the m instance to access the available methods; you don’t have to call it mbut we are for brevity. The users who voted to close gave this specific reason: Contents [ show ].
The only difference is in ParentMap we’re now calling DiscriminateSubclassesOnColumn with a “type” parameter; this parameter is the column name in the table which dictates what class each docu,entation represents.
If you really do want a one-to-one, then you can use the HasOne method. The first parameter is a property accessor lambda, like all the other methods, and the second one is another lambda quite often referred to as a nested-closure in these situations that defines a new scope for defining the mappings of that particular sub-part in this case the component.
References is nhibernwte creating many-to-one relationships between two entities; you’re referencing another entity, so you use the References method. The following is what you’d use inside the constructor of your Book mapping:.
Every mapping requires an Id of some kind, these are mapped using the Id method; this method nhibednate a lambda expression of the property you want to use as your Id.
In database terms that would be a book table with a foreign key column referencing the primary key of a author table. HasOne is usually reserved for a special case, generally you’d use a References in most situations see: Cfg fluently configuring the NHibernate.
A reference is to a single instance of an entity, if you’re mapping a collection then you need either HasMany or an HasManyToMany which can be viewed as the “other side” of the References relationship.
There are a few different types of collections you can use, and they’re all available under the HasManyToMany call.
Fluent NHibernate’s interface is designed for discoverability. For example, if you’re generating your schema you may want to specify whether the column itself is nullable, you can do that by using the Nullable method and optionally the Not operator property. The first column holds the type of the associated entity. Retrieved from ” http: As you can see, the first parameter references the Address property on our entity, which is jhibernate property that holds our component.
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If you wanted to do a table-per-class-hierarchy strategy, then you just need to specify the discriminator column in your ClassMap. That’s it, you’ve now created a references relationship between book and author. In this example we’re documenttaion that the Id property is mapped to a PersonId column in the database, and it’s using an assigned generator.
I have been using Reflector to find things and it works, but it is not ideal. Can anyone either confirm that I need to generate my own after building the source or point me to somewhere I have missed? The second property is where we define what makes up the component. Fluent NHibernate knows what the return type of your property is, and assumes that the column it’s mapping against will have the same name as the property itself.
Mapping contains classes used to create Fluent Mappings. How could I have possibly used VS as long as I have and never noticed its namespace resolution support?
You can read about them here. This question appears to be off-topic. The main ones you’ll normally use are many-to-one’s, one-to-many’s, and many-to-many’s. You should use this only in very special cases documentqtion.
Automapping all you need to automaticly create mappings for classes. Sign In Don’t have an account? The remaining columns hold doumentation identifier. Instead, describe the problem and what has been done so far to solve it. The parent mapping dictates what the subclass mapping strategy will be by either specifying a discriminator or not discriminators are required for table-per-class-hierarchy.
That’s all there is to it, parent and child are now mapped as subclasses. We’ll go into each in more detail next. There are a few different types of collections you can use, and they’re all available under the HasMany call. For example if you wanted to specify the cascade strategy you’d use the Cascade property.
Property ; the x on the left is flunt parameter declaration, which will be the entity you’re mapping, while the x. Table-per-subclass is the default mapping for subclasses, so unless you say otherwise you’ll have a separate table per-subclass. For example, if your Id property is an int fluwnt, then we assume you’re using an identity column; similarly, if you use a Guid then we assume it’s a Guid Comb.
Everything you need should be easy to find “under” the declaring method using method chains.
Fluent NHibernate – The official website
There are several methods available that map your properties in different ways, and each one of those is a method chain that you can use to customise the individual mapping. Subclasses work in a very similar way to ClassMap’sin that you create a derived class which you put your mappings in; it’s just you use SubclassMap instead of ClassMap. It’s a fluent interface that allows you to map your entities completely in code, with all the compile-time safety and refactorability that brings.
Components are a clever way of mapping a normalized data model into a more reasonable object model. The Component method takes two parameters, rather than just one like the rest of the methods you’ve seen so far.