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Now that we have explored the three inheritance mapping implementations, let s look at some of the characteristics of a class inheritance hierarchy to consider when choosing which implementation approach to use for your type hierarchies. The following list contains subjective questions about your own entity hierarchies. They do not have precise answers, but are meant to stimulate design consideration when building your application. Class hierarchies can be static, with a fixed number of subtypes, or they can be dynamic, with varying numbers of subtypes. How often will you need to incorporate new subtypes into your hierarchy Hierarchies can be deep, with lots of subclasses, or they can be shallow, with only a few. How granular is your hierarchy The types in a hierarchy may diverge greatly, with very different sets of properties on the subclasses than the base class, or with very little difference in properties. How much do the persistent property sets of your entities diverge from one another

Will other entities define relationships with classes in this type hierarchy, and if so, will the base classes frequently be the referenced type Will types in this hierarchy be frequently queried, updated, or deleted How will the presence or absence of SQL JOIN or UNION operations impact your application s performance During the life of your application, how frequently will you be updating the structure of the type hierarchy itself The impact of this type of change varies for each inheritance strategy, with considerations that include the following: Adding or removing new types to the hierarchy (as when refactoring classes). Adding, removing, or modifying fields on an entity in the hierarchy. Adding, removing, or modifying relationships involving types in this hierarchy.

Note While this stored procedure gets you what you need, it may still be too generic. Since the time card

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Note A comparison of the performance of these three inheritance strategies, along with details on how to

looks at a week at a time, perhaps it would be best to add another stored procedure that gets punches for a particular user, but during a date span. This further reduces the data you return and, consequently, reduces the code you need to write for searching for what you want. I leave this exercise up to you.

set up your own performance comparison tests, is explored in 9. Check out the results of our performance tests, and test your own entity hierarchies as you build them, to help you decide which strategy makes best sense in the context of your application.

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YourCompany_UpdateTimePunch This is the last stored procedure you need for this module. In fact, you may not ever use it. This procedure updates an existing record. Right now, the TimePunch screen does not allow you to do that. However, it would be a simple matter to add correction capability to the screen, at which point this procedure comes into play.

Within an entity class hierarchy, EJB 3 allows both non-entity classes and abstract classes to be intermixed. Let s look at how we map these classes.

As shown in the previous section on inheritance hierarchies, EJB 3 entities may be either concrete or abstract. An abstract entity is simply an entity that cannot be instantiated in can still be involved in entity relationships and queries, and its fields are persisted following the mapping strategy for its type hierarchy. Listing 4-16 is an example of one of our abstract entities.

Open the YourCompany_UpdateTimePunch stored procedure in the IDE. The code for this is as follows:

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/* * Person: An abstract entity, and the root of a JOINED hierarchy */ @Entity @Inheritance(strategy = InheritanceType.JOINED) @DiscriminatorColumn(name = "TYPE") @NamedQuery(name = "Person.findAll", query = "select o from Person o") @SequenceGenerator(name = "PersonIdGenerator", sequenceName = "CH04_JOIN_PERSON_SEQ", initialValue = 100, allocationSize = 20) @Table(name = "CH04_JOIN_PERSON") public abstract class Person implements Serializable { ... @OneToOne(cascade = { CascadeType.ALL }) @JoinColumn(name = "HOME_ADDRESS", referencedColumnName = "ID") private Address homeAddress; ... }

ALTER procedure dbo.YourCompany_UpdateTimePunch @ModuleId @ItemId @Content @UserID as update YourCompany_TimePunch set Content = @Content, CreatedByUser = @UserID, CreatedDate = getdate() where ModuleId = @ModuleId and ItemId = @ItemId int, int, ntext, int

Not only is the abstract Person entity queryable (here we have defined a "Person.findAll" named query), it also holds an association with the Address entity that is shared by all of its subclasses. Although Person is abstract, it can specify its own mappings and its own table. It just won t have its own discriminator value, since there will never be a concrete entity instance of the base class Person.

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Mapped Superclass (@MappedSuperclass)

The key word in this procedure is the SQL UPDATE. Change the code, so it looks like the code that follows (the new code is in bold):

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