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Some databases support a primary key identity column, sometimes referred to as an autonumber column Whenever a row is inserted into the table, the identity column will get a unique identifier assigned to it It can be used to generate the identifiers for objects, but once again is available only when the underlying database supports it Identity is often used when database sequences are not supported by the database or because a legacy schema has already defined the table to use identity columns They are generally less efficient for object-relational identifier generation because they cannot be allocated in blocks and because the identifier is not available until after commit time To indicate that IDENTITY generation should occur, the @GeneratedValue annotation should specify a generation strategy of IDENTITY This will indicate to the provider that it must reread the inserted row from the table after an insert has occurred.

n this chapter: Learn more about your target devices with the J2ME Polish device database. Get to know the XML format of the files in the device database: devices.xml, vendors.xml, groups.xml, apis.xml, and bugs.xml. Discover how to use the device database to select your target devices, assemble devicespecific resources, and optimize your applications.

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This will allow it to obtain the newly generated identifier from the database and put it into the in-memory entity that was just persisted: @Id @GeneratedValue(strategy=GenerationTypeIDENTITY) private int id; There is no generator annotation for IDENTITY because it must be defined as part of the database schema definition for the primary key column of the entity Because each entity primary key column defines its own identity characteristic, IDENTITY generation cannot be shared across multiple entity types Another difference, hinted at earlier, between using IDENTITY and other id generation strategies is that the identifier will not be accessible until after the insert has occurred Although no guarantee is made about the accessibility of the identifier before the transaction has completed, it is at least possible for other types of generation to eagerly allocate the identifier.

In this chapter, you will learn about the J2ME Polish device database. This database forms the basis of J2ME Polish and is essential for building and preprocessing applications. You can use the defined features and capabilities of the devices for selecting target devices in the build process and for adjusting your application to different handsets with preprocessing. Knowing the structure and uses of the device database is crucial for getting the most out of J2ME Polish.

Let s make the line a bit wider, color it red, and make it semi-transparent. To do this, you have to add these properties to the PolylineOptions object and assign them the appropriate values. Having done that, the code will look like this: var polyline = new google.maps.Polyline({ path: route, strokeColor: "#ff0000", strokeWeight: 5, strokeOpacity: 0.6 }); Now you have a nice semi-transparent red line instead of the boring black line you had before (Figure 8-4 gives you the idea). The line being semi-transparent is a nice touch since it makes it easier to read the map underneath it, thereby enhancing the usability of the map.

But when using identity, it is the action of inserting that causes the identifier to be generated It would be impossible for the identifier to be available before the entity is inserted into the database, and because insertion of.

entities is most often deferred until commit time, the identifier would not be available until after the transaction has been committed.

The J2ME device database consists of different XML files that reside in the installation folder of J2ME Polish by default. The following files are included in the device database: devices.xml: Describes the capabilities and known issues of many J2ME capable devices. vendors.xml: Lists all vendors and manufacturers of J2ME devices. groups.xml: Describes the device groups. Each device can belong to an arbitrary number of groups. apis.xml: Lists optional and vendor-specific libraries, such as the Mobile Media API (MMAPI). bugs.xml: Describes known issues associated with devices.

Listing 8-2 shows the complete code for this example. Listing 8-2. The Complete JavaScript for Example 8-1 (function() { window.onload = function() { // Creating a map var options = { zoom: 5, center: new google.maps.LatLng(36.1834, -117.4960), mapTypeId: google.maps.MapTypeId.ROADMAP }; var map = new google.maps.Map(document.getElementById('map'), options); // Creating an array that will contain the points for the polyline var route = [ new google.maps.LatLng(37.7671, -122.4206), new google.maps.LatLng(34.0485, -118.2568) ]; // Creating the polyline object var polyline = new google.maps.Polyline({ path: route,

If entities contained only simple persistent state, the business of object-relational mapping would be a trivial one, indeed. Most entities need to be able to reference, or have relationships with, other entities. This is what produces the domain model graphs that are common in business applications. In the following sections, we will explore the different kinds of relationships that can exist and show how to define and map them using JPA mapping metadata.

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