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Questions tagged [joined-subclass]

Joined-subclass is a mapping strategy in Hibernate and NHibernate that is also known as "Table per subclass".

Joined-subclass mapping is a mapping strategy in Hibernate and NHibernate where a superclass A is mapped to its own table and all subclasses that extend A is mapped to their own table, but with a join to A's table. Only the properties defined at each level in the inheritance hierarchy will be stored in corresponding columns in each class' database table.

When selecting a derived class B from the database, Hibernate does a select on A with a left outer join on B as well as all other classes extending from A. Depending on which left outer join returns any data, Hibernate constructs a new instance of the correct class (in this case, B) and fills it with data from table A and B.

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Fluent Nhibernate 1.0 - Specify foreign key constraint name between class and joined subclass

I think this should be simple, but I can't figure out how to do it. Suppose I have the following maps: public class AnimalMap : ClassMap { Id( x => x.Id); } public class CatMap: SubclassMap { Extends(); Map(x =>…
Andy
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How to access discriminator column in JPA

I have DisseminationArea as subcalss for Feature with the following code: @Entity @Table(name = "features") @Inheritance(strategy = InheritanceType.JOINED) @DiscriminatorColumn(name = "subtype_id", discriminatorType =…
Dims
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Fluent NHibernate JoinedSubClass is obsolete

I wonder about something. I'm sitting here with a solution there I have 1 superclass that has 2 subclasses and I'm currently mapping this using JoinedSubClass, but I get that this method is obsolete, and says that I should ClassMap and SubClassMap,…
dbn2k
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NHibernate Many-To-One on Joined Subclass with Filter

I have a class setup that looks something like this: public abstract class Parent { public virtual bool IsDeleted { get; set; } } public class Child : Parent { } public class Other { public virtual ICollection Children { get; set;…
Nathan Roe
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Play Framework 2 Ebean and InheritanceType as JOINED

After some research on Google, I haven't found anyone who has my problem that's why I'm posting it here. In my application I have three entities : User (abstract), Customer, Agency. Customer and Agency extends User. Here is the code of User…
c4k
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JPA @PrePersist and @PreUpdate order when using inheritance

Supposing the following code snippet which uses @PrePersist and @PreUpdate annotations and Joined-type inheritance: @Entity @Inheritance(strategy=InheritanceType.JOINED) public abstract class A { ... @PrePersist private void…
Aliuk
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Multi-Level Inheritance in Joined Inheritance strategy using discriminator for each parent in hierarchy

Consider my classes below Product (Abstract Root class) @Entity @Table(name="PRODUCT") @Inheritance(strategy=InheritanceType.JOINED) @DiscriminatorColumn(name="PRODUCT_TYPE") public abstract class Product { @Id @GeneratedValue …
Jeff
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NHibernate Discriminated Subclasses of a Joined-Subclass

Here's my heirarchy: class abstract Entity { /*members*/ } // mapped to entity table class abstract User : Entity { /*members*/ } // mapped to user table class Employee : User { /*no members*/ } // no table, discriminator = "E" class Contractor :…
Travis Heseman
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Fluent nHibernate - DiscriminateSubClassesOnColumn with multiple tables?

I've been trying to wrap my head around subclasses and joined subclasses in Fluent nHibernate for a few days now without making any sort of headway. I've looked at the wiki but it doesn't seem to give me enough information, and googling returns me…
charachu
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Avoiding outer joins across tables when using joined inheritance with Spring Data JPA

Consider the following classes in a Spring Data JPA (+ Hibernate) application: @Entity @Inheritance(strategy = InheritanceType.JOINED) @Table(name = "person") public class Person { } @Entity @Table(name = "customer") public class Customer extends…
manish
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In a JPA entity hierarchy using InheritanceType.JOINED, all relationships with subclasses results in foreign key constraints on the superclass table

I have the following JPA 2.0 Entities @Entity @Inheritance(strategy= InheritanceType.JOINED) public abstract class BookKeepingParent implements Serializable { @Id protected Long Id; ... } @Entity public class Employee extends…
Nikhilesh
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Fluent NHibernate automapping table-per-abstract-hierarchy / table-per-concrete-subclass

I have classes public abstract class Content : IContent { public virtual Guid Id { get; protected set; } public virtual IPage Parent { get; set; } public virtual DateTime Created { get; set; } /* ... */ } public abstract class Page :…
Mike Koder
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Fluent NHibernate trying to map subclass of subclass using table-per-subclass

I am building an application with heavy inheritance and have a part where there exists classes, A, B and C with: class A class B : A class C : B I implemented subclass mapping as a table-per-subclass style for class B as follows: class BMap :…
Leroy
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NHibernate - Retrieve specific columns and count using criteria query

This is my mapping file: class name="CRMStradCommon.Entities.OportunidadEntity,CRMStradCommon" table="oportunidad">
Cristian Sapino
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Change column for joined class mapping in Fluent NHibernate Automapping

I have an inheritance public abstract class UserEntity : Entity { public virtual int Id { get; protected set; } } public class Employee : UserEntity { public virtual string Email { get; set; } } Entity is a standard for NH class where…
pocheptsov
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