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As we will see in 13, when we talk about schema generation, there exists metadata that either permits the database columns to be null or requires them to have values. While this setting will affect the physical database schema, there are also settings on some of the logical mappings that allow a basic mapping or a single-valued association mapping to be left empty or required to be specified in the object model. The element that requires or permits such behavior is the optional element in the @Basic, @ManyToOne, and @OneToOne annotations. When the optional element is specified as false, it indicates to the provider that the field or property mapping may not be null. The API does not actually define what the behavior is in the case when the value is null, but the provider may choose to throw an exception or simply do something else. For basic mappings, it is only a hint and can be completely ignored. The optional element may also be used by the provider when doing schema generation, because, if optional is set to true, then the column in the database must also be nullable. Because the API does not go into any detail about ordinality of the object model, there is a certain amount of non-portability associated with using it. An example of setting the manager to be a required attribute is shown in Listing 10-17. The default value for optional is true, making it necessary to be specified only if a false value is needed. Listing 10-17. Using Optional Mappings @Entity public class Employee { // ... @ManyToOne(optional=false) @JoinColumn(name="DEPT_ID", insertable=false, updatable=false) private Department department; // ... }

getFlat()

com.siemens.mp.ui. Image.mirrorImage Horizontally() com.siemens.mp.ui. Image.mirrorImage Vertically() com.motorola. game.ImageUtil. getScaleImage() com.siemens. mp.ui.Image. createImageWith Scaling()

If you are in the opportune position of starting from a Java application and creating a database schema, then you have complete control over what the schema looks like and how you map the classes to the database. In this case, it is likely that you will not need to use very many of the advanced relationship features that are offered by the API. The flexibility of being able to define a data model usually makes for a less demanding mapping configuration. However, if you are in the unfortunate situation of mapping a Java model to an existing database, then in order to work around the data schema you might need access to more mappings than those we have discussed so far. The mappings described in the following

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sections are primarily for mapping to legacy databases, and will most often be used because they are the only option. A notable exception is the orphan removal feature, used to model a parent child relationship.

de.enough.polish. util.ImageUtil. scale()

getIcon()

We have already seen mappings such as the many-to-many and unidirectional one-to-many mappings that use join tables Sometimes a database schema uses a join table to relate two entity types, even though the cardinality of the target entity in the relationship is one A one-to-one or many-to-one relationship does not normally need a join table because the target will only ever be a single entity and the foreign key can be stored in the source entity table But if the join table already exists for a many-toone relationship, then of course we must map the relationship using that join table To do so, we need only add the @JoinTable annotation to the relationship mapping Whether the relationship is unidirectional or bidirectional, the @JoinTable annotation is a physical annotation and must be defined on the owning side of the relationship, just as with all other mappings.

For example, if you use the Graphics.drawRGB() method for creating a translucent background, you can use the com.nokia.mid.ui.DirectUtils and com.nokia.mid.ui.DirectGraphics APIs for replicating the functionality when Nokia s UI API is supported by the target device. Listing 11-10 shows how you can use preprocessing for determining which APIs can be used. It also demonstrates how the drawRGB() call is adjusted for devices that have the drawRgbOrigin bug, which is the case with some devices. Listing 11-10. Porting Translucent Backgrounds import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; //#if polish.api.nokia-ui && !polish.midp2 import com.nokia.mid.ui.DirectGraphics; import com.nokia.mid.ui.DirectUtils; //#endif import de.enough.polish.ui.Background; public class TranslucentSimpleBackground extends Background { private final int argbColor; //#ifdef polish.midp2 // int MIDP/2.0 the buffer is always used: private int[] buffer; private int lastWidth; //#elif polish.api.nokia-ui private Image imageBuffer; //# private int lastWidth; private int lastHeight; //#endif

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