pdf viewer in java

how to view pdf file in java

java pdf viewer api

As you can see, neither the User entity nor the related BillingInfo entity is managed when the persist method is invoked, since both are newly instantiated. Let s assume for the purpose of this example that the User and BillingInfo entities are saved into the USERS and BILLING_INFO tables, with the one-to-one relationship modeled with a foreign key on the USERS table referencing the BILLING_ID key in the BILLING_INFO table. As you might guess from looking at listing 9.5, two INSERT statements, one for the User and the other for the BillingInfo entity, are issued by JPA. The INSERT statement on the USERS table will contain the appropriate foreign key to the BILLING_INFO table. Cascading persist operations Perhaps surprisingly, it is not the default behavior for JPA to persist related entities. By default, the BillingInfo entity would not be persisted and you would not see an INSERT statement generated to persist the BillingInfo entity into the BILLING_ INFO table. The key to understanding why this is not what happens in listing 9.5 lies in the @OneToOne annotation on the billing property of the User entity:

1. Switch to MainPage.xaml and select your UC_GreenButton control. 2. In the Miscellaneous bucket of the Properties panel, you should now see the

Figure 11-3. Sign up to receive security announcements from Drupal.org. There are also a few pages on http://drupal.org you can visit to see previous security announcements containing a description of found security bugs:

public class User { @OneToOne(cascade=CascadeType.PERSIST) public void setBillingInfo(BillingInfo billing) {

Notice the value of the cascade element of the @OneToOne annotation. We deferred the discussion of this element in chapter 7 so that we could discuss it in a more relevant context here.

Now that our DependencyProperty has a value of Click Here, we can Data Bind the Text property of the MainText TextBlock. Let s do that now!

Cascading in ORM-based persistence is similar to the idea of cascading in databases. The cascade element essentially tells the EntityManager how, or if, to propagate a given persistence operation on a particular entity into entities related to it. By default, the cascade element is empty, which means that no persistence operations are propagated to related entities. Alternatively, the cascade element can be set to ALL, MERGE, PERSIST, REFRESH, or REMOVE. Table 9.3 lists the effect of each of these values.

http://drupal.org/security for a list of all security announcements relating to core Drupal http://drupal.org/security/contrib for all contrib-related security announcements http://drupal.org/security/psa for all security-related announcements http://drupal.org/taxonomy/term/100 for a list of all core and contrib modules that have updates, in chronological order

4. Switch to UC_GreenButton.xaml in Blend and select the MainText TextBlock. 5. In the Common Properties bucket of the Properties panel, click the Advanced Options

Table 9.3 Effects of various cascade type values. CascadeType Value CascadeType.MERGE Effect Only EntityManager.merge operations are propagated to related entities. Only EntityManager.persist operations are propagated to related entities. Only EntityManager.refresh operations are propagated to related entities. Only EntityManager.remove operations are propagated to related entities. All EntityManager operations are propagated to related entities.

Since in our case we have set the cascade element to PERSIST, when we persist the User entity, the EntityManager figures out that a BillingInfo entity is associated with the User entity and it must be persisted as well. As table 9.3 indicates, the persist operation would still be propagated to BillingInfo if the cascade element were set to ALL instead. However, if the element were set to any other value or not specified, the operation would not be propagated and we would have to perform the persist operation on the BillingInfo entity separately from the User entity. For example, let s assume that the cascade element on the @OneToOne annotation is not specified. To make sure both related entities are persisted, we d have to change the addUser method as shown in listing 9.6.

button, as I am doing in Figure 11-36.

public User addUser(String username, String email, String creditCardType, String creditCardNumber, Date creditCardExpiration) { User user = new User();

You can access site reports by clicking the Reports link in the administration toolbar, as shown in Figure 11-4. This page contains a number of reports to help you understand site health and usage trends. I recommend you frequently check the reports on this page; I check reports at least once a week for some of my busier sites. The default installation enables several modules that contribute reports to this page, including search, field UI, status updates, and database logging. I also recommend enabling the statistics module, which provides several reports on how users interact with your site.

user.setUsername(username); user.setEmail(email); BillingInfo billing = new BillingInfo(); billing.setCreditCardType(creditCardType); billing.setCreditCardNumber(creditCardNumber); billing.setCreditCardExpiration(creditCardExpiration); entityManager.persist(billing); user.setBillingInfo(billing); entityManager.persist(user); return user; }