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Finally, an entity may embed a non-entity class for its own private use. Such classes are marked @Embeddable and may hold mapping metadata for their persistent fields. A class marked @Embeddable may be used as a field type in an entity. When used in this way, the field is marked @Embedded and the fields on the embeddable class map to the owning entity s table. Embeddable classes have no persistent identity of their own, and instances of embeddable classes may not be passed around among entities. They are generally used for their convenience as a field organization tool, allowing a set of persistent fields to be encapsulated as a single field on the owning entity. As an example, let us transform our Address entity (Listing 4-19) into an embeddable class, and embed it as a field on the Person entity (Listing 4-20). Figure 4-5 shows the CH04_EMB_PERSON table we will use that contains columns for the fields found on the Address entity.

All I did here was add the extra qualifier of the PunchUserID. This allows the return of only the punches related to the user I am interested in.

Figure 4-5. Table CH04_EMB_PERSON holds columns for all fields in the Person entity hierarchy, as well as fields from an embedded Address field.

1. 2. 3.

/* * Address: An embeddable non-entity class */ @Embeddable public class Address implements Serializable { protected String city; protected String state; protected String street1; protected String street2; @Column(name = "ZIP_CODE") protected Long zipCode; public Address() { } /* get/set methods */ }

GetTimePunch The GetTimePunch method calls the YourCompany_GetTimePunch stored procedure. Before you go on, look at the stored procedure, and see if you need to adjust this method to correctly call it (the answer follows).

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/* * Person: An abstract entity, and the root of a SINGLE_TABLE hierarchy */ @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "TYPE") @NamedQuery(name = "Person.findAll", query = "select o from Person o") @SequenceGenerator(name = "PersonIdGenerator", sequenceName = "CH04_EMB_PERSON_SEQ", initialValue = 100, allocationSize = 20) @Table(name = "CH04_EMB_PERSON") public abstract class Person implements Serializable { @Column(name = "FIRST_NAME") private String firstName;

This method, as it stands, gets a punch based on the ItemID and the ModuleID. These two columns make the row unique. If you know the ItemID, there is no need to change this method. Leave it as is.

After testing the site and ensuring that every works as it should I m ready to deploy the site to production.

@Id @Column(nullable = false) @GeneratedValue(generator="PersonIdGenerator") private Long id; @Column(name = "LAST_NAME") private String lastName; @Version private Long version; @Embedded private Address homeAddress; public Person() { } /* get/set methods */ }

When a Person instance is persisted, if its homeAddress field is not null, all of the values of fields on its homeAddress instance are saved into columns we have added to the CH04_EMB_PERSON table.

AddTimePunch The AddTimePunch method calls the YourCompany_AddTimePunch stored procedure. If you remember, the stored procedure takes the following arguments: ItemID as an integer Punch_Type as an integer Punch_User as an integer The Punch_Date is calculated by the stored procedure itself. The argument data types being passed in by the AddTimePunch method are (integer, string, integer). Since you need to pass in all integers, you need to change some data types, as well as the names of the arguments, to better reflect what you are passing in. Here is the new AddTimePunch method, which correctly calls the YourCompany_AddTimePunch stored procedure:

After testing the site, I m ready to deploy it to the organization s production server. I developed the site on my laptop, so I ll need to perform the following steps to move the site to the new server: 1. 2. Set up an empty database on the production server. Create a database user account and assign all privileges to that account.

As shown in the previous examples, entity relationships can be specified between both concrete and abstract entities in a hierarchy. You can define a relationship with any entity in an inheritance hierarchy, and it will implicitly involve subtypes of that entity as well. Even persistent entity relationship fields declared on mapped superclasses are polymorphic. A relationship that implicitly includes subtypes in this way is known as a polymorphic relationship. In EJB 3, relationships may be defined against any other entity class, including abstract supertype entities in a hierarchy. This support for polymorphic relationships complements EJB 3 s support for mapping class hierarchies, and provides a powerful construct for querying entities at any level across an entity type hierarchy. In the previous example entity hierarchy, the FullTimeEmployee.manager-to-Employee.managedEmployees relationship illustrates a one-to-many, bidirectional relationship between the concrete FullTimeEmployee (manager) and its collection of abstract Employee (managedEmployee) instances. This example shows a relationship between entities within the same hierarchy, but could just as easily be defined between entities in separate entity hierarchies.

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