java itext pdf remove text

java itext pdf remove text

java itext pdf remove text

Figure 11-2. Navigate to Reports Available updates, and click the SETTINGS tab to configure update notifications.

transaction If an enclosing transaction is not present when the persist method is invoked, a TransactionRequiredException is thrown for a transaction-scoped entity manager If you are using an application-managed or extended entity manager, invoking the persist method will attach the entity to persistence context If a new transaction starts, the entity manager joins the transaction and the changes will be saved to the database when the transaction commits The same is true for the EntityManager s flush, merge, refresh, and remove methods Persisting entity relationships One of the most interesting aspects of persistence operations is the handling of entity relationships JPA gives us a number of options to handle this nuance in a way that suits a particular application-specific situation Let s explore these options by revisiting listing 94 The addItem method is one of the simplest cases of persisting entity relationships.

The Seller entity is retrieved using the find method, so it is already managed, and any changes to it are guaranteed to be transparently synchronized Recall from chapter 7 that there is a bidirectional one-to-many relationship between the Item and Seller entities This relationship is realized in listing 94 by setting the Seller using the itemsetSeller method Let s assume that the Seller entity is mapped to the SELLERS table Such a relationship between the Item and Seller entities is likely implemented through a foreign key to the SELLERSSELLER_ID column in the ITEMS table Since the Seller entity is already persisted, all the EntityManager has to do is set the SELLER_ID foreign key in the generated INSERT statement Examining the INSERT statement presented earlier, this is how the SELLER_ID value is set to 1.

to MainText, as I have done in Figure 11-34.

Note that if the seller property of Item were not set at all, the SELLER_ID column in the INSERT statement would be set to NULL Things become a lot more interesting when we consider the case in which the entity related to the one we are persisting does not yet exist in the database This does not happen very often for one-to-many and many-to-many relationships In such cases, the related entity is more than likely already saved in the database However, it does occur a lot more often for one-to-one relationships For purposes of illustration, we ll stray from our ItemManager example and take a look at saving User entities with associated BillingInfo entities Recall that we introduced this unidirectional, one-to-one relationship in chapter 7 The method outlined in listing 9.

Drupal has a low-volume e-mail list dedicated to announcing security issues affecting Drupal core and contributed modules. It s also good to sign up for the Drupal newsletter if you want to hear about Drupalrelated conferences and other happenings (see Figure 11-3). Signing up is relatively easy: 1. 2. 3. 4. Create an account at http://drupal.org; if you already have one, sign in. Navigate to the Your Dashboard page or alternately to http://drupal.org/user. Click the Edit link, and then click the My newsletters tab. Select the security announcements check box, and click save.

5 receives user information such as username, e-mail, as well as billing information such as credit card type and number, and persists both the User and related BillingInfo entities into the database..

Now that you have named the TextBlock, we need to make sure it doesn t keep its default Text of TextBlock. We actually want it to be the value of our DependencyProperty. But first we should give that a value, as up until now we have only registered it. Let s do that now:

public User addUser(String username, String email, String creditCardType, String creditCardNumber, Date creditCardExpiration) { User user = new User(); user.setUsername(username); user.setEmail(email); BillingInfo billing = new BillingInfo(); billing.setCreditCardType(creditCardType); billing.setCreditCardNumber(creditCardNumber); billing.setCreditCardExpiration(creditCardExpiration); user.setBillingInfo(billing); entityManager.persist(user); return user; }