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Parameter handling for criteria API queries is different from JP QL. Whereas JP QL strings simply prefix string names with a colon to denote a parameter alias, this technique will not work in the criteria API. Instead, we must explicitly create a ParameterExpression of the correct type that can be used in conditional expressions. This is achieved through the parameter() method of the CriteriaBuilder interface. This method requires a class type (to set the type of the ParameterExpression object) and an optional name for use with named parameters. Listing 9-4 demonstrates this method. Listing 9-4. Creating Parameter Expressions CriteriaQuery<Employee> c = cb.createQuery(Employee.class); Root<Employee> emp = c.from(Employee.class); c.select(emp); ParameterExpression<String> deptName = cb.parameter(String.class, "deptName"); c.where(cb.equal(emp.get("dept").get("name"), deptName)); If the parameter will not be reused in other parts of the query, it can be embedded directly in the predicate expression to make the overall query definition more concise. The following code revises the Listing 9-4 to use this technique: CriteriaQuery<Employee> c = cb.createQuery(Employee.class); Root<Employee> emp = c.from(Employee.class); c.select(emp) .where(cb.equal(emp.get("dept").get("name"), cb.parameter(String.class, "deptName")));

Summary

In the Entity Overview section, it was stated that a specific API call needs to be invoked before an entity actually gets persisted to the database In fact, separate API calls are needed to perform many of the operations on entities This API is implemented by the entity manager and encapsulated almost entirely within a single interface called EntityManager When all is said and done, it is to an entity manager that the real work of persistence is delegated Until an entity manager is used to actually create, read, or write an entity, the entity is nothing more than a regular (nonpersistent) Java object When an entity manager obtains a reference to an entity, either by having it explicitly passed in as an argument to a method call or because it was read from the database, that object is said to be managed by the entity manager.

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Listing 9-4. Logging an Exception try { image = Image.createImage( url ); } catch (IOException e) { //#debug error System.out.println("Unable to load image [" + url + "]" + e ); } You can show the log manually at any time by calling the de.enough.polish.util.Debug. showLog( Display display ) method. This class is located in the ${polish.home}/import/ enough-j2mepolish-client.jar file. You should add this file to the classpath of your project in your IDE. You should show the log only when the logging framework is activated. Otherwise, you won t see many entries in your log. You can detect whether the logging framework is active by checking the polish.debugEnabled preprocessing symbol in your code. Listing 9-5 demonstrates how you can use a command to trigger the log. Listing 9-5. Showing the Log Manually import de.enough.polish.util.Debug; import javax.microedition.lcdui.*; import javax.microedition.midlet.*; public class MyMIDlet extends MIDlet implements CommandListener { //#ifdef polish.debugEnabled private Command logCmd = new Command( "Show log", Command.SCREEN, 10 ); //#endif private Screen mainScreen; private Display display; public MyMIDlet() { this.mainScreen = new List( "Hello World", List.IMPLICIT ); this.mainScreen.setCommandListener( this ); //#ifdef polish.debugEnabled this.mainScreen.addCommand( this.logCmd ); //#endif } public void startApp() { this.display = Display.getDisplay( this ); this.display.setCurrent( this.mainScreen ); }

The set of managed entity instances within an entity manager at any given time is called its persistence context Only one Java instance with the same persistent identity may exist in a persistence context at any time For example, if an Employee with a persistent identity (or id) of 158 exists in the persistence context, then no other Employee object with its id set to 158 may exist within that same persistence context Entity managers are configured to be able to persist or manage specific types of objects, read and write to a given database, and be implemented by a particular persistence provider (or provider for short) It is the provider that supplies the backing implementation engine for the entire Java Persistence API, from the EntityManager through to implementation of the query classes and SQL generation All entity managers come from factories of type EntityManagerFactory.

In this chapter, you learned how to set up a web page and how to insert a fully functional Google map in it. The map has all the basic functionality, which means that you can pan it, zoom in and out of it, and change the map type. You now have a solid map to build from. You also learned about some of the basic features of the JavaScript language. With the knowledge gained from this chapter, you re ready to examine how you can tweak the map to look and behave the way you want, and that s exactly what you re going to do in the next chapter where you will examine all the properties of the MapOptions object.

public void destroyApp( boolean unconditional ) { notifyDestroyed(); } public void pauseApp() { } public void commandAction(Command cmd, Displayable screen ) { //#ifdef polish.debugEnabled if (cmd == logCmd) { Debug.showLog( this.display ); return; } //#endif } }

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