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CHAPTER 5 MANY-TO-ONE AND ONE-TO-ONE MAPPING
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And the address mapping file must having a join element similar to the one in the CUSTOMER table, to make it bidirectional one-to-one: <hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Address5_3" table="Address" schema="BOOK5"> <id name="addressId" type="long" column="ADDRESS_ID" > <generator class="native"> </generator> </id> <property name="city" type="string" column="CITY" /> <property name="street" type="string" column="STREET" /> <property name="doorplate" type="string" column="DOOR_PLATE" /> <join table="CustomerAddress" optional="true" inverse="true"> <key column="ADDRESS_ID" unique="true" /> <many-to-one name="customer" class="com.hibernaterecipes.chapter5.Customer5_3" column="ID" unique="true" not-null="true"> </many-to-one> </join> </class> </hibernate-mapping> Using JPA annotations, the Address class is mapped to its customer property with the OneToOne annotation: @Entity @Table (name="ADDRESS",schema="BOOK5") public class Address5_3 implements Serializable { private static final long serialVersionUID = -605474766287314591L; @Id @Column (name="ADDRESS_ID") @GeneratedValue (strategy=GenerationType.AUTO) private Long id; @Column(name="CITY") private String city; @Column(name="STREET") private String street; @Column(name="DOOR_PLATE") private String doorplate; @OneToOne (mappedBy="address") private Customer5_2 customer; // getters and setters }
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CHAPTER 5 MANY-TO-ONE AND ONE-TO-ONE MAPPING
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The Customer table uses the JoinTable annotation to map the address object: @Entity @Table (name="CUSTOMER",schema="BOOK5") public class Customer5_3 implements Serializable { private static final long serialVersionUID = -3534434932962734600L; @Column (name="ID") @Id @GeneratedValue (strategy=GenerationType.AUTO) private Long id; @Column private @Column private @Column private (name="COUNTRY_CODE") String countryCode; (name="ID_CARD_NO") String idCardNo; (name="FIRST_NAME") String firstName;
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@Column (name="LAST_NAME") private String lastName; @Column (name="EMAIL") private String email; @OneToOne (cascade=CascadeType.ALL) @JoinTable (name="CustomerAddress", schema="BOOK5", joinColumns=@JoinColumn(name="ID"), inverseJoinColumns=@JoinColumn(name="ADDRESS_ID")) private Address5_3 address; // getters and setters }
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In this chapter, you ve seen how to represent and work with many-to-one and one-to-one associations using Hibernate. For a many-to-one association, you define the <many-to-one> mapping element in the class that has the many side of the relationship. In the case where there can be null foreign key values, you use a join table to map between the two dependent objects; the join table contains IDs of both the dependent objects. You learned that you can use lazy initialization to increase performance: the data of the dependent object is retrieved from the database only on demand. You also learned that shared primary keys are used when rows in two tables are related by a primary key association. You saw how to map a one-to-one association with a <many-to-one> element and then have a unique constraint on the one relationship. A one-to-one association can also be mapped using a join table.
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CHAPTER 6
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Collection Mapping
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An object of value type has no database identity, and objects of value type are dependent on the owning entity object. The lifespan of the value type is bound by the lifespan of the owning entity. Entities that have a collection of value types need to be mapped to an appropriate collection interface from the Java API. For entities to have a collection of value types, you need to have a separate table with the entity s primary key as a foreign key. Hibernate supports most of the collection interfaces provided by Java API. It s recommended that you use the collection interface to declare the type of the property and a matching implementation. Hibernate suggests using interfaces to declare collections because it supports Java collection, maps, and arrays; it has a <set> tag to support for all java.util.Set collections and <bag> or <idbag> to support java.util.Collection. You should initialize the implementation at the time of declaration to avoid uninitialized collections. The following code declares chapters to be type java.util.Set (which is an interface) and the matching implementation as java.util.HashSet: Private Set<String> chapters = new HashSet<String>(); This chapter shows you how to map collections for value types. In Hibernate, collections can be lazily initialized, which means the state of the collection objects is loaded from the database only when the application needs it. This initialization is done transparently from the user. The chapter also deals with sorting collections in memory and at database level. You add a collection of chapters to your Book class as an example.
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