qr code generator javascript Building tables with Ant and SchemaExport in Java

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Building tables with Ant and SchemaExport
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</java> </target>
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After adding this target to the build, you can run the find target from the command line:
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$ ant f build4.xml find
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When the find target runs, you should see something like this:
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find: [java] 15:42:43,947 WARN EventFinder: - Event: Annual Meeting [java] 15:42:43,947 WARN EventFinder: - Location: Hilton Convention Center
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As you can see, both the Event and Location objects are loaded from the database and their properties are displayed.
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4.2.6 Cascades
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You can make one more refinement to your model. In section 3.2, we discussed collections and cascades. Since your location is just the opposite end of a collection, you can use cascading here as well.
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Saving the object graph
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In your EventLoader, you had to explicitly save both the Event and Location objects, even though you specifically set the Location object on Event. If you remove the session.save(location) line from the EventLoader, you will see an exception like this:
org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.manning.hq.ch04.Location
Hibernate is telling you that you associated the Event, which is persistent, with a nonpersistent (or transient) Location object. So when the session.flush() method is called, inserting the Event, it balks at the Location, which wasn t made persistent. Needing to explicitly save one
Associations and components
associated object, the location isn t too bad, but if Event had two or three associated objects (or more), it s just extra work for you. Hibernate can minimize this unnecessary work by allowing you to define cascading behavior relationships between your objects.
Location cascading
Cascading means that when you save, update, or delete an object, its associated objects can be affected as well. In our case, you want the Location to be saved when you save or update the Event. Modify the Event.hbm.xml file and add a new attribute to the <many-to-one> element, as shown here:
<many-to-one name="location" column="location_id" class="Location" cascade="save-update" />
You have defined the location relationship as save-update. This means any time you save a new event, the Location will be saved too. You can test this out by modifying the EventLoader class and commenting out the code that saves Location:
session.save(event); // Use cascading to save the location // session.save(location);
Rerun the build target and you should see that both Event and Location have been saved. Refer back to section 3.2 for a complete list of the possible cascades.
4.3 Components
Associations in Hibernate define relations between tables. In the previous example, you have two tables, events and locations, and two objects, Event and Location. So the general usage is one table equals one object. Sometimes it is useful to have a more granular relationship, where one table equals more than one object. Hibernate allows you to do this by using components. Components are not entities, like their
Components
containing object, and are bound by their parent. They also do not have an identity, and exist only if the parent entity does.
4.3.1 What s in a component
Components allow you to take several columns and group them into a single object. Let s look back at our Location object. Currently it has an address field, which is a simple String. We just put in a single street, but you could certainly stuff a full address into that one field, like so:
location.setAddress("950 North Stafford St. Arlington, VA 22204");
This will work, but you can t do much with one amalgamated column of address data. You probably want to break it up into several columns, with street, city, state, and zip code. This would make your Location object look like this:
public class Location implements Serializable { private Long id; private String name; private String streetAddress; private String city; private String state; private String zipCode; // getters and setter omitted }
This would certainly work. But you could also refactor this code to extract a component. Do this by grouping these new fields into a single logical object, Address, and have Hibernate handle it as a component. Figure 4.3 shows a UML diagram of what this would look like.
Address Location -id : long -name : string 1 1 -address -streetAddress : string -city : string -state : string -zipCode : string
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