winforms pdf 417 reader

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Simply by looking at the number of arrows in the respective diagrams, you can see that the client-side event handling is far simpler than the server-side event handling. If you choose server-side event handling, several things take place before all is said and done: The browser detects the click and decides what to do with it. The browser submits the request back to the server. This is called a postback. The server runs code that handles the event. The server renders the page again with any changed data for any fields on the page. The server sends the page back to the browser. The browser renders the page. While this often happens in the blink of an eye, it is a lot of work. More to the point, it takes a complete round-trip to handle any event. For example, if you caught a change mouseover event for several pictures on a page, the round-trips to the server could get annoying to the customer. You see, every time you submit the page to the server, it has to render the whole page again and send it back. This results in the familiar flicker you often see on web pages. If you have a dense web page with lots of pictures, these events can really slow down the interaction speed.

Exposing Composite Key Class Fields Directly on the Entity Class (@IdClass)

Therefore, it is best to handle simple events on the browser when possible. It makes for a quicker and more realistic experience for the user. However, do not be afraid of using server-side events. ASP.NET makes heavy use of server-side events, and they can be very handy and powerful to program.

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An alternative approach to mapping a composite primary key, shown in Listing 4-24, is to declare fields explicitly on the entity class for each field in the primary key class, but annotate each of them @Id. If any of the fields on the primary key double as useful properties on your entity, you will probably want to take this approach. You then define a new composite key class that declares each of these @Id fields, taking care that they exactly match the key class fields in name and type.

If your intent is to run your new Drupal site in a hosted environment, the work of setting up the foundational components has already been done for you by the hosting company. If you are using a

Listing 4-24. Person.java, Illustrating Usage of a Composite Primary Key Representing Multiple @Id Fields

very popular these days. It is a method in which the client can make requests of a server for data without submitting the page. The server can send back data, and the client can then update a single field in the page. This is very fast and requires no rerendering of the page (more on this technique much later in the book).

/* * Person: An abstract entity, and the root of a SINGLE_TABLE hierarchy, * demonstrating use of an @Embedded Address field as its @EmbeddedId */ @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "TYPE") @NamedQuery(name = "Person.findAll", query = "select o from Person o") @SequenceGenerator(name = "PersonIdGenerator", sequenceName = "CH04_ST_PERSON_SEQ", initialValue = 100, allocationSize = 20) @Table(name = "CH04_EMB_PERSON") @IdClass (PersonPK.class) public abstract class Person implements Serializable { @Column(name = "FIRST_NAME") private String firstName; @Id @Column(nullable = false) @GeneratedValue(generator="PersonIdGenerator") private Long id;

hosting company, you can skip to the section on installing Drupal. If your intention is to develop your site on your desktop or laptop and then deploy your site to a server, you will need to install and configure the components required to support Drupal.

Postbacks I mentioned in the previous section that server-side event handling is done via a postback or page submittal. Submittals are how the browser sends data back to the server. You can design a page with several controls. One special control is called a submit button. When this button is pressed in the browser, the page is automatically submitted back to the server. The server can read all the controls on the page and the values of those controls. Once the server has read the control values, it can save the data to a database and perform some business logic based on the values. When the server is done processing the posted page, it sends back the same page (with the same or different values) or a different page. Remember this, though: even if nothing changes on the page, the server must rebuild the entire page, values and all, before sending it as HTML back to the browser. While this process may seem wasteful, it has worked for years and is the standard way of doing things. While postbacks seem inefficient, I should say here that web servers such as IIS are very efficient at rendering HTML for web pages. Such web servers use all kinds of memory caching, which speeds up processing to the point that the user won t even notice the flicker, at least on lightweight pages.

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