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If an id attribute in an entity is a relationship, then the type of the matching attribute in the id class is of the same type as the primary key type of the target entity in the relationship (whether the primary key type is a simple type, an id class, or an embedded id class). If the derived identifier of a dependent entity is in the form of an embedded id class, then each attribute of that id class that represents a relationship should be referred to by a @MapsId annotation on the corresponding relationship attribute.

Using the lowest common denominator makes things quite simple; you just need to stick to the MIDP 1.0 profile and the CLDC 1.0 profile. Unfortunately, this is not the whole truth. Besides the need for professional user interfaces and the limited functionality, you still have to circumvent device bugs somehow. But since you deal only with a small fraction of the available possibilities, you might get away lucky. A similar strategy is to target only MIDP 2.0 devices, which is becoming more and more feasible, even though new devices with MIDP 1.0 support are still released into the market. The MIDP 2.0 technology is, however, young and therefore behaves quite differently and unexpectedly on different existing devices. Problems with device issues are inevitable. The advantage of using a common denominator is that you have only one application bundle, so deploying the application is much easier. But this strategy does not relieve you of the testing burden, since you still need to test your application on every target device. Business relationships can be seriously jeopardized when you say that your application is running on a specific handset but in reality it isn t.

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A simple, if somewhat less common case, is when the derived identifier is composed of a single attribute that is the relationship foreign key As an example, suppose there was a bidirectional one-to-one relationship between Employee and EmployeeHistory entities Because there is only ever one EmployeeHistory per Employee, we might decide to share the primary key In Listing 10-10, if the EmployeeHistory is the dependent entity, then we indicate that the relationship foreign key is the identifier by annotating the relationship with @Id Listing 10-10 Derived Identifier with Single Attribute @Entity public class EmployeeHistory { // @Id @OneToOne @JoinColumn(name="EMP_ID") private Employee employee; // } The primary key type of EmployeeHistory is going to be of the same type as Employee, so if Employee has a simple integer identifier then the identifier of EmployeeHistory is also going to be an integer.

Table A-14 gives the properties of the MapPanes object. Table A-14. The Properties of the MapPanes Object

If Employee has a compound primary key, either with an id class or an embedded id class, then EmployeeHistory is going to share the same id class (and should also be annotated with the @IdClass annotation) The problem is that this trips over the id class rule that there should be a matching attribute in the entity for each attribute in its id class This is the exception to the rule, because of the very fact that the id class is shared between both parent and dependent entities Occasionally, somebody might want the entity to contain a primary key attribute as well as the relationship attribute, with both attributes mapped to the same foreign key column in the table Even though the primary key attribute is unnecessary in the entity, some people might want to define it separately for easier access.

Caution Using the lowest common denominator is a valid approach, but you should consider the business aspects of this decision as well. Users might be disappointed about old or lame applications, so they will choose another vendor the next time. Also, you will have difficulties finding marketing partners unless you have come up with a revolutionary new concept.

Despite the fact that the two attributes map to the same foreign key column (which is also the primary key column), the mapping does not have to be duplicated in both places The @Id annotation is placed on the identifier attribute and @MapsId annotates the relationship attribute to indicate that it is mapping the id attribute as well This is shown in Listing 10-11 Note that physical mapping annotations (eg @Column) should not be specified on the empId attribute since @MapsId is indicating that the relationship attribute is where the mapping occurs..

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