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If this is not actually the name of the column, the @JoinColumn annotation must be defined to override the default Going back to Figure 4-10, the foreign key column is named DEPT_ID instead of the defaulted DEPARTMENT_ID column name Listing 4-17 shows the @JoinColumn annotation being used to override the join column name to be DEPT_ID Listing 4-17 Many-to-One Relationship Overriding the Join Column @Entity public class Employee { @Id private int id; @ManyToOne @JoinColumn(name="DEPT_ID") private Department department; // .. }.

Component 11: Button 5 Identifier: 5 ComponentType: Absolute Component 12: Button 6 Identifier: 6 ComponentType: Absolute Component 13: Button 7 Identifier: 7 ComponentType: Absolute Component 14: Button 8 Identifier: 8 ComponentType: Absolute Component 15: Button 9 Identifier: 9 ComponentType: Absolute Component 16: Button 10 Identifier: 10 ComponentType: Absolute Component 17: Button 11 Identifier: 11 ComponentType: Absolute

Annotations allow us to specify @JoinColumn on either the same line as @ManyToOne or on a separate line, above or below it. By convention, the logical mapping should appear first, followed by the physical mapping. This makes the object model clear because the physical part is less important to the object model.

Let s look at how you can enable compression on three popular servers: Apache, Microsoft Internet Information Services (IIS), and Tomcat.

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The first two lines give the device name and type. Rather strangely, JInput believes the gamepad is a joystick (a stick), which is actually quite common. Each component has an index number for instance, the x-axis is component 4. The component names and identifiers are the same as those shown by ControllerReadTest in Figure 11-7. I explain the ComponentType information in the Examining a Component section. The RumbleTest application checks every device to see if it can generate force feedback. For my gamepad, it reports Found 5 rumblers, and progresses to test each one. It s rather hard to tell the differences between them, but the first rumbler setting seems to activate the left rumbler, the second setting controls the right rumbler, and the other three trigger both rumblers together.

If only one employee could work in a department, we would be back to the one-to-one association again. A more realistic example of a one-to-one association, however, would be an employee who has a parking space. Assuming that every employee got assigned his or her own parking space, we would create a one-to-one relationship from Employee to ParkingSpace. Figure 4-11 shows this relationship.

If you are running Apache web server version 1.3, you should install and enable the mod_gzip module, available online at http://sourceforge.net/projects/mod-gzip/. If you are running version 2.x of Apache, you should configure the mod_deflate module, which is included in the Apache installation. Full instructions on mod_deflate can be found online at http://httpd. apache.org/docs/2.0/mod/mod_deflate.html. Basic configuration is as simple as typing the following into your apache.confd file: AddOutputFilterByType DEFLATE text/html text/plain text/xml text/javascript text/json

I cover the basics of JInput programming by describing three applications: ListControllers: It prints a list of all the detected input devices (controllers). ControllerDetails: It outputs a list of all of the components that form part of a specified controller. TestController: This displays the numbers generated by a given component as the user manipulates it. These examples all read input from the command line and report to standard output, which allows me to put off the issue of integrating Swing and JInput until later in the chapter. The compilation and execution of these programs is carried out with the help of two batch files that add in the necessary classpath and library path settings. compileJI.bat contains the following: javac -classpath d:\jinput\bin\jinput-windows.jar;. %1 runJI.bat holds the following: java -cp d:\jinput\bin\jinput-windows.jar;. -Djava.library.path="d:\jinput\bin" %1 %2 %3

Figure 4-11. One-to-one relationship from Employee to ParkingSpace We define the mapping in a similar way to the way we define a many-to-one mapping, except that we use the @OneToOne annotation instead of a @ManyToOne annotation on the parkingSpace attribute. Just as with a many-to-one mapping, the one-to-one mapping has a join column in the database and needs to override the name of the column in a @JoinColumn annotation when the default name does not apply. The default name is composed the same way as for many-to-one mappings using the name of the source attribute and the target primary key column name. Figure 4-12 shows the tables mapped by the Employee and ParkingSpace entities. The foreign key column in the EMPLOYEE table is named PSPACE_ID and refers to the PARKING_SPACE table.

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