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Listing 4.1
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Basic Event.java class
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package com.manning.hq.ch04; import java.io.Serializable; import java.util.Date; import com.manning.hq.ch04.Location; public class Event implements Serializable { private Long id; private int duration; private String name; private Date startDate; private Location location; public Event() { } public Event(String name) { this.name = name; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getStartDate() { return startDate; } public void setStartDate(Date startDate) { this.startDate = startDate; } public int getDuration() { return duration; } public void setDuration(int duration) { this.duration = duration; } public Location getLocation() { return location; } public void setLocation(Location location) { this.location = location; } }
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Listing 4.2 Basic Location class
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package com.manning.hq.ch04; import java.io.Serializable; public class Location implements Serializable { private Long id; private String name; private String address; public Location() { } public Location(String name) { this.name = name; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
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As you can see, both of these are basic classes, which follow the JavaBean specification for getter/setter fields. In listing 4.1, note that Event has a location field, which links it to a Location object. Also note that in listing 4.2, to keep the example simple for now, we have made the address field of Location a simple String. Later in this chapter, you will create the Address object you saw on Location in the previous chapter.
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Mapping the database
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Given the Java classes Event and Location that you have created so far, you need to map them to the database structure. Figure 4.2 shows
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Associations
events PK uid name start_date duration location_id
locations PK,FK1 uid name address
Figure 4.2 ER diagram for the events and locations tables
what the entity-relationship (ER) diagram for the two relational database tables will look like. It might be worth pointing out that a database ER diagram for the data model shows the arrow pointing from locations to events based on the FK-PK relationship, whereas the corresponding UML object model focuses on association navigation from the Event object to the Location. This highlights a very simple example of the Object-Relational paradigm mismatch. So we need some more information to explain how the two objects are mapped to the database. As discussed in section 3.2, each of the classes needs a corresponding mapping file, in this case, Event.hbm.xml and Location.hbm.xml, which will define the persistent fields and the relationship between the two files. Put the files in the same directory as the Event.java and Location.java files. Listing 4.3 shows these two mapping files. Listing 4.3 Location.hbm.xml, which makes Location a persistent entity
< xml version="1.0" > <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.manning.hq.ch04"> <class name="Location" table="locations"> <id name="id" column="uid" type="long"> <generator class="native"/>
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</id> <property name="name" type="string"/> <property name="address" type="string"/> </class> </hibernate-mapping>
Note that in listing 4.3 you include a DTD declaration, which helps IDEs validate the document. The line <class name="Location" table="locations"> persists instances to the location s table. Next, create a mapping file for your Event class (listing 4.4) and put it in the same directory. Listing 4.4 The Event.hbm.xml mapping file, which makes Event persistent and links it to your Location class
< xml version="1.0" > <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.manning.hq.ch04"> <class name="Event" table="events"> <id name="id" column="uid" type="long"> <generator class="native"/> </id> <property name="name" type="string"/> <property name="startDate" column="start_date" type="date"/> <property name="duration" type="integer"/> <many-to-one name="location" column="location_id" class="Location" /> </class> </hibernate-mapping>
The mapping element <many-to-one class="Location" /> in listing 4.4 converts the Java field location into its SQL/relational-based representation. This element says that there should be a foreign key, location_id, in the events table, which links to the locations table. The class attribute defines which Java class handles the association.
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