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CHAPTER 4 OBJECT RELATIONAL MAPPING WITH HIBERNATE
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As you can see, there are three SQL INSERT statements for the ADDRESS table and three for the USER table. Notice the values of the USERTYPE column in the different SQL INSERTS. If we inspect the USER table you should see the three records with their foreign key constraints to the three records in the ADDRESS table as shown next: mysql> select PK_ID, FIRSTNAME, LASTNAME, EMAIL, USERTYPE, FK_ADDRESS_ID from USER; +-------+-----------+----------+--------------------+----------+---------------+ | PK_ID | FIRSTNAME | LASTNAME | EMAIL | USERTYPE | FK_ADDRESS_ID | +-------+-----------+----------+--------------------+----------+---------------+ | 1 | Jim | Smith | jim@smith.com | USR | 1 | | 2 | Bob | Smithers | bsmithers@acme.com | ATD | 2 | | 3 | Jackie | Roberts | jroberts@acme.com | PST | 3 | +-------+-----------+----------+--------------------+----------+---------------+ 3 rows in set (0.00 sec) mysql> select * from ADDRESS; +-------+------------------+-----------+------------+-------+---------+ | PK_ID | STREETADDRESS | APTNUMBER | CITY | STATE | ZIPCODE | +-------+------------------+-----------+------------+-------+---------+ | 1 | 123 Main Street | N/A | Columbus | OH | 43081 | | 2 | 456 Vine Street | N/A | Cincinnati | OH | 45202 | | 3 | 1 Easy Street | N/A | Columbus | GA | 31901 | +-------+------------------+-----------+------------+-------+---------+ 3 rows in set (0.02 sec) The power of Hibernate s handling of inheritance lies in the ability to issue polymorphic queries. Before we jump into some examples, I will introduce you to the use of a tool that has saved me countless hours of coding and debugging when working with complex Hibernate queries. That tool is the Hibernate Console, which is a part of the collection of Eclipse plug-ins that encompasses the Hibernate Tools Project. The Hibernate Console is an Eclipse perspective that gives several views to work with your mapped objects. The Hibernate Tools plug-ins can be obtained as part of the JBoss Eclipse IDE set of plug-ins or in a stand-alone distribution. For detailed information on how to obtain and install the Hibernate Tools, see the Hibernate Tools website at www.hibernate.org/255.html. Once you have successfully installed the Hibernate Tools plug-ins, you are ready to work with your persistence objects without having to write a single line of Java code. Using any existing Eclipse project containing Hibernate mapped POJOs, you can select the Hibernate Console perspective for the Perspective toolbar. The Console is shown in Figure 4-15.
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Figure 4-15. Hibernate Console perspective The Console provides a tree view of Console configurations (a Console configuration is associated with a Hibernate configuration), an HQL editor view, and a Query results view. First we need a Hibernate configuration file to be used by our Console configuration, as opposed to the previous example shown in Listing 4-20. The file hibernate-no-mappings.cfg.xml we will be using has no mappings declared, as shown in Listing 4-27. Listing 4-27. Hibernate XML Configuration File with No Mappings < xml version="1.0" encoding="utf-8" > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <!-- =================================================================== --> <!-- Session Factory used for Testing --> <!-- =================================================================== --> <session-factory> <property name="hibernate.connection.url"> jdbc:mysql://localhost/test
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CHAPTER 4 OBJECT RELATIONAL MAPPING WITH HIBERNATE
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</property> <property name="hibernate.connection.driver_class"> com.mysql.jdbc.Driver </property> <property name="hibernate.connection.username">yourUserName</property> <property name="hibernate.connection.password">yourPassword</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.show_sql">true</property> </session-factory> </hibernate-configuration> Now that we have a Hibernate configuration file ready, we can create a Console configuration by right-clicking on the Hibernate Configurations view and selecting Add Configuration from the popup menu, which will bring up a dialog as shown in Figure 4-16.
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Figure 4-16. Adding a Console configuration
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The Create Hibernate Console Configuration wizard asks you to specify the Hibernate configuration via a properties file in the Property file field or using an XML configuration in the Configuration file field. Click the Browse button next to the Configuration file field and select the file hibernate-no-mappings.cfg.xml previously created. Next, in the Classpath section add the JAR file containing the database driver as well as the path (directory) of your compiled POJO classes (you can simply add the bin directory of your Eclipse project). Finally, we need to tell the Console which mappings to load by clicking Add next to the Mapping files field and selecting the HBM files as shown in Figure 4-17 and clicking OK.
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Figure 4-17. Adding mapping files to a Console configuration Click Finish, and you should now see the new Console configuration in the tree view. To work with this Console configuration right-click and select Create SessionFactory. The node in the tree view should now show the mapped entities as under the Mapped entities node of Console configuration node. You can expand individual entity nodes to reveal the details of a particular mapping as shown in Figure 4-18. You are now ready to test your mappings by typing your HQL queries in the HQL editor view. Going back to our inheritance mapping test for the Table-Per-Class-Hierarchy strategy, let s try some HQL queries. First let s check the contents of the User hierarchy by issuing the query shown in Figure 4-19. As expected, this should return the three objects previously created.
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