Below is a class model and an Oracle schema that I would like to map it to using Fluent NHibernate.
public enum EnumA { Type1, Type2, Type3 };
public class ClassB
{
public virtual string Property1 { get; set; }
public virtual string Property2 { get; set; }
}
public class ClassA
{
public virtual int ID { get; set; }
public virtual string Name { get; set; }
public virtual IDictionary<EnumA, IList<ClassB>> MyDictionary { get; set; }
}
TableA (NUMBER(38) ID PK, VARCHAR2(255) Name)
TableB (NUMBER(38) ID PK FK, NUMBER(38) Type PK, VARCHAR(255) Prop1, VARCHAR(255) Prop2)
How should I define the Fluent NHibernate mapping class?
I don't mind introducing a new domain class if necessary. I have tried the following:
public class ClassB
{
public virtual string Property1 { get; set; }
public virtual string Property2 { get; set; }
}
public class classC
{
public virtual EnumA EnumA { get; set; }
IList<ClassB> ClassBList { get; set; }
}
public class ClassA
{
public virtual int ID { get; set; }
public virtual string Name { get; set; }
public virtual IDictionary<EnumA, classC> MyDictionary { get; set; }
}
with the following mapping class
public ClassAMap()
{
WithTable("ClassA");
Id(x => x.ID);
Map(x => x.Name);
HasMany(x => x.MyDictionary).AsMap<EnumA>(d => d.EnumA).Component(c =>
{
c.HasMany(e => e.ClassBList).Component(f =>
{
f.Map(x => x.Property1);
f.Map(x => x.Property1);
});
});
}
However, this does not generate a valid configuration. Can anybody help?
Class B isn't a component of A, it's a related entity with its own identity (ID, Type) so it can't logically be a component, as components don't have their own identity (PK) otherwise they would be separate entities.
Related
How would I be able to Map an object inside of another with two columns that arent keys?
public class Car
{
public virtual int Id { get; set; }
public virtual int AccountId { get; set; }
}
public class UserAccount
{
public virtual int Id { get; set; }
public virtual int UserId{ get; set; }
public virtual int AccountId { get; set; }
}
public class User
{
public virtual int Id { get; set; }
public virtual int Name { get; set; }
}
Lets say I wanted to get all Cars with a User.Name of "joe". How would I map / query these with fluent nhibernate?
public Car()
{
Table("Car");
Id(x => x.Id).Column("ID").GeneratedBy.Native();
Map(x => x.AccountId);
References(x => x.Account); // ?? needs to map accountid with the Account.Id...
}
If you want to map a reference, you need the type, not the key.
public class Car
{
public virtual int Id { get; set; }
public virtual UserAccount Account { get; set; }
}
Then you would map it like this
public Car()
{
Table("Car");
Id(x => x.Id).Column("ID").GeneratedBy.Native();
References(x => x.Account, "AccountId");
}
I got a scenario where a composite Id uniquely identifies an entity. I defined the MSSQL to have a multiple primary key on those fields. In addition I would like an auto-incremented id to be used for referencing a one-to-many relationship. Here's the schema:
public class Character
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual Region Region { get; set; }
public virtual string Realm { get; set; }
public virtual IList<CharProgression> Progression { get; set; }
}
public class CharProgression
{
public virtual int Id { get; set; }
public virtual Character Character { get; set; }
public virtual Stage Stage { get; set; }
public virtual int ProgressionPoints { get; set; }
public virtual int NumOfSaves { get; set; }
}
public class Stage
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
}
The mappings look like this:
class CharacterMap : ClassMap<Character>
{
public CharacterMap()
{
Table("characters");
Id(ch => ch.Id, "id").GeneratedBy.Identity().Not.Nullable();
CompositeId().KeyProperty(ch => ch.Region, "region")
.KeyProperty(ch => ch.Realm, "realm")
.KeyProperty(ch => ch.Name, "name");
HasMany<CharProgression>(ch => ch.Progression).Inverse().Cascade.All();
}
}
class CharProgressionMap : ClassMap<CharProgression>
{
public CharProgressionMap()
{
Table("char_progression");
CompositeId().KeyReference(cprog => cprog.Character, "char_id",
.KeyReference(cprog => cprog.Stage, "stage_id");
Id(cprog => cprog.Id, "id").GeneratedBy.Identity().Not.Nullable();
Map(cprog => cprog.ProgressionPoints, "progression_points");
Map(cprog => cprog.NumOfSaves, "num_of_saves");
}
}
public class StageMap : ClassMap<Stage>
{
public StageMap()
{
Table("stages");
Id(st => st.Id, "id").GeneratedBy.Identity().Not.Nullable();
Map(st => st.Name, "name");
Map(st => st.Description, "description");
}
}
Now, the thing is that I would like to use SaveOrUpdate() on a character and use the composite id for the update, since the character uniqueness is defined by those 3 fields - region, realm, name.
However, when I am referencing the Character from CharProgression, I don't want to use the composite Id as I don't want the char_progression table to hold 3 fields for identifying a character, a simple Id is enough... which is why I also defined an IDENTITY id on the Character entity.
Is what i'm trying possible? or is there another way to achieve this?
Thanks :)
How to write mappings in new NHibernate Mapping-By-Code in Table Per Subclass strategy for this classes:
public class Person
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
}
public class JuridicalPerson : Person
{
public virtual int Id { get; set; }
public virtual string LegalName { get; set; }
}
public class PrivatePerson : Person
{
public virtual int Id { get; set; }
public virtual bool Sex { get; set; }
}
Here is a possible mapping in a slighly abbreviated form
public class PersonMapping : ClassMapping<Person>
{
public PersonMapping()
{
Table("person");
Id(x => x.Id, m => m.Generator(Generators.Native));
Property(x => x.Name);
}
}
public class JuridicalPersonMapping : JoinedSubclassMapping<JuridicalPerson>
{
public JuridicalPersonMapping()
{
Table("juridical_person");
Key(m => m.Column("person_id"));
Property(x => x.LegalName);
}
}
public class PrivatePersonMapping : JoinedSubclassMapping<PrivatePerson>
{
public PrivatePersonMapping()
{
Table("private_person");
Key(m => m.Column("person_id"));
Property(x => x.Sex);
}
}
You don't need to duplicate declaration of the Id property in the derived classes. It's inherited from the parent Person class.
I'm having problems mapping a relationaship between two entities when there are two columns involved in the mapping.
I'm modelling a state machine with two object types - State and Transition. Each process has its own state machine, so States and Transitions need to be identified by ProcessId. My entity classes are like this:
public class State
{
public virtual long Id { get; set; }
public virtual int ProcessId { get; set; }
public virtual int Ordinal { get; set; }
public virtual Process Process { get; set; }
public virtual ICollection<Transition> TransitionsIn { get; set; }
public virtual ICollection<Transition> TransitionsOut { get; set; }
}
public class Transition
{
public virtual long Id { get; set; }
public virtual long ProcessId { get; set; }
public virtual int FromStateNum { get; set; }
public virtual int ToStateNum { get; set; }
public virtual long StateActionId { get; set; }
public virtual Process Process { get; set; }
public virtual StateAction StateAction { get; set; }
public virtual State FromState { get; set; }
public virtual State ToState { get; set; }
}
I need the navigation properties (State.TransitionsIn, State.TransitionsOut, Transition.FromState, Transition.ToState) to be based on the ProcessId and the Ordinal number of the state. For example, Transition.FromState should navigate to the entity where t.ProcessId = s.ProcessId and t.FromStateNum = s.Ordinal.
I've tried the following mapping, but it complains that I'm using two columns to map to one (StateId).
public class StateMap : ClassMap<State>
{
public StateMap()
{
Id(x => x.Id);
HasMany(s => s.TransitionsIn)
.KeyColumns.Add("ProcessId", "ToStateNum")
.Inverse();
HasMany(s => s.TransitionsOut)
.KeyColumns.Add("ProcessId", "FromStateNum")
.Inverse();
}
}
public class TransitionMap : ClassMap<Transition>
{
public TransitionMap()
{
Id(x => x.Id);
References(t => t.FromState)
.Columns("ProcessId", "Ordinal");
References(t => t.ToState)
.Columns("ProcessId", "Ordinal");
}
}
How can I get this to work?
How about this mapping.. I have not tested it but just trying to give a direction.
public class StateMap : ClassMap<State>
{
public StateMap()
{
Id(x => x.Id);
HasMany(s => s.TransitionsIn)
.KeyColumn("ProcessId")
.KeyColumn("ToStateNum").PropertyRef("Ordinal")
.Inverse();
HasMany(s => s.TransitionsOut)
.KeyColumn("ProcessId")
.KeyColumn("FromStateNum").PropertyRef("Ordinal")
.Inverse();
}
}
public class TransitionMap : ClassMap<Transition>
{
public TransitionMap()
{
Id(x => x.Id);
References(t => t.FromState)
.Columns("ProcessId", "FromStateNum");
References(t => t.ToState)
.Columns("ProcessId", "ToStateNum");
}
}
We're using FluentNHibernate and we have run into a problem where our object model requires data from two tables like so:
public class MyModel
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual int FooId { get; set; }
public virtual string FooName { get; set; }
}
Where there is a MyModel table that has Id, Name, and FooId as a foreign key into the Foo table. The Foo tables contains Id and FooName.
This problem is very similar to another post here: Nhibernate: join tables and get single column from other table but I am trying to figure out how to do it with FluentNHibernate.
I can make the Id, Name, and FooId very easily..but mapping FooName I am having trouble with. This is my class map:
public class MyModelClassMap : ClassMap<MyModel>
{
public MyModelClassMap()
{
this.Id(a => a.Id).Column("AccountId").GeneratedBy.Identity();
this.Map(a => a.Name);
this.Map(a => a.FooId);
// my attempt to map FooName but it doesn't work
this.Join("Foo", join => join.KeyColumn("FooId").Map(a => a.FooName));
}
}
with that mapping I get this error:
The element 'class' in namespace 'urn:nhibernate-mapping-2.2' has invalid child element 'join' in namespace 'urn:nhibernate-mapping-2.2'. List of possible elements expected: 'joined-subclass, loader, sql-insert, sql-update, sql-delete, filter, resultset, query, sql-query' in namespace 'urn:nhibernate-mapping-2.2'.
any ideas?
I think you misunderstood something here.
Instead of having Id, Name, FooId and FooName in same class you need to create two classes
public class MyModel
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual Foo Foo { get; set; }
}
public class Foo
{
public virtual int Id { get; set; }
public virtual string FooName { get; set; }
}
And your mapping classes for these:
public class MyModelMapping : ClassMap<MyModel>
{
public MyModelMapping()
{
this.Id(x => x.Id);
this.Map(x => x.Name);
this.References(x => x.Foo);
}
}
public class FooMapping : ClassMap<Foo>
{
public FooMapping()
{
this.Id(x => x.Id);
this.Map(x => x.FooName);
}
}
this should help.
But remember Convention other Configuration :)