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You don t have to do anything special in Hibernate to enable polymorphic behavior. The mapping for CreditCard and BankAccount is straightforward, each in its own entity <class> element, as we have done already for classes without a superclass (or persistent interfaces). Hibernate still knows about the superclass (or any interface) because it scans the persistent classes on startup. The main problem with this approach is that it doesn t support polymorphic associations very well. In the database, associations are usually represented as foreign key relationships. In figure 5.1, if the subclasses are all mapped to different tables, a polymorphic association to their superclass (abstract BillingDetails in this example) can t be represented as a simple foreign key relationship. This would be problematic in our domain model, because BillingDetails is associated with User; both subclass tables would need a foreign key reference to the USERS table. Or, if User had a many-to-one relationship with BillingDetails, the USERS table would need a single foreign key column, which would have to refer both concrete subclass tables. This isn t possible with regular foreign key constraints. Polymorphic queries (queries that return objects of all classes that match the interface of the queried class) are also problematic. A query against the superclass must be executed as several SQL SELECTs, one for each concrete subclass. For a query against the BillingDetails class Hibernate uses the following SQL:

UPDATE Sales.SalesOrderDetail SET OrderQty = OrderQty WHERE SalesOrderDetailID BETWEEN 1 AND 1000;

1-20

select CREDIT_CARD_ID, OWNER, NUMBER, EXP_MONTH, EXP_YEAR ... from CREDIT_CARD select BANK_ACCOUNT_ID, OWNER, ACCOUNT, BANKNAME, ... from BANK_ACCOUNT

Note the cost of the update from the Execution Plan tab. Because there are two separate plans displayed in the Execution Plan tab, one for the update statement, and one for the update statement executed by the trigger, the new cost of the update will be the sum of the cost of these updates. 8. Test the accuracy of the trigger by inserting, deleting and updating rows in the Sales.OrderDetail table and validating the changes to the TotalSales column in the Sales.Customer table for the affected customer or customers. 9. To clean up after this lab, close all open query windows in SQL Server Management Studio, open a new query window, and execute the following SQL statements:

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Notice that a separate query is needed for each concrete subclass. On the other hand, queries against the concrete classes are trivial and perform well only one of the statements is needed.

(Also note that here, and in other places in this book, we show SQL that is conceptually identical to the SQL executed by Hibernate. The actual SQL may look superficially different.) A further conceptual problem with this mapping strategy is that several different columns, of different tables, share exactly the same semantics. This makes schema evolution more complex. For example, a change to a superclass property results in changes to multiple columns. It also makes it much more difficult to implement database integrity constraints that apply to all subclasses. We recommend this approach (only) for the top level of your class hierarchy, where polymorphism isn t usually required, and when modification of the superclass in the future is unlikely. Also, the Java Persistence interfaces don t support full polymorphic queries; only mapped entities (@Entity) can be officially part of a Java Persistence query (note that the Hibernate query interfaces are polymorphic, even if you map with annotations). If you re relying on this implicit polymorphism, you map concrete classes with @Entity, as usual. However, you also have to duplicate the properties of the superclass to map them to all concrete class tables. By default, properties of the superclass are ignored and not persistent! You need to annotate the superclass to enable embedding of its properties in the concrete subclass tables:

1

USE AdventureWorks; ALTER TABLE Sales.SalesOrderDetail ENABLE TRIGGER iduSalesOrderDetail; IF(OBJECT_ID('Sales.Customer') IS NOT NULL) ALTER TABLE Sales.Customer ENABLE TRIGGER uCustomer;

@MappedSuperclass public abstract class BillingDetails { @Column(name = "OWNER", nullable = false) private String owner; ... }

7

Now map the concrete subclasses:

1. Which of the following versions of Windows Server 2003 require product activa tion (Select all that apply.) a. Windows Server 2003, Standard Edition, retail version b. Windows Server 2003, Enterprise Edition, evaluation version c. Windows Server 2003, Enterprise Edition, Open License version d. Windows Server 2003, Standard Edition, Volume License version 2. What are the distinctions among a domain, a tree, and a forest in Active Directory

@Entity @AttributeOverride(name = "owner", column = @Column(name = "CC_OWNER", nullable = false) ) public class CreditCard extends BillingDetails { @Id @GeneratedValue @Column(name = "CREDIT_CARD_ID") private Long id = null; @Column(name = "NUMBER", nullable = false) private String number; ... }

DROP TRIGGER trgSalesOrderDetailDenorm; ALTER TABLE Sales.Customer DROP COLUMN TotalSales;

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