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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.

*/ } public: [Category("Input")] [Description("The name of the file to dump")] [DefaultValue("")] property String^ FileName; [BrowsableAttribute(false)] property int PagesDumped { int get() { return pagesDumped; } } [Category("Output")] [Description("Event is fired when a full page has been dumped")] event PageDumpedEventHandler^ PageDumped; void Dump() { /* .. discussed later .. */ } };.

The Microsoft.Web.Services3 namespace provides a class called SoapEnvelope, which you use for generating SOAP messages in code. The SoapEnvelope class derives from the System.Xml.XmlDocument class, not surprisingly, and so it supports XML document loading so that you can load preformatted SOAP messages into a SoapEnvelope object. Alternatively, you can construct the SOAP message from scratch by setting properties on the SoapEnvelope object. Table 8-3 highlights important members of the SoapEnvelope class. Listing 8-4 shows you how to construct a SOAP message in code for requesting a stock quote from the RequestQuote operation. Table 8-3. The SoapEnvelope Class

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); entityManager.persist(billing); user.setBillingInfo(billing); entityManager.persist(user); return user; }

As you can see, the BillingInfo entity is persisted first. The persisted BillingInfo entity is then set as a field of the User entity. When the User entity is persisted, the generated key from the BillingInfo entity is used in the foreign key for the generated INSERT statement. Having explored the persist operation, let s now move on to the next operation in the EntityManager CRUD sequence retrieving entities.

For this new member in the source code, the C++/CLI compiler emits five new members in the managed FileDumper class. First of all, a private backing storage field is defined. This field is a tracking handle to the event handler delegate. Since the event is defined as a public event, there are two public accessor methods defined. These are called add_PageDumped and remove_PageDumped. The first function registers an event handler delegate by adding it to the invocation list; the latter one removes an event handler delegate from the invocation list to unregister it. To fire the event, a third accessor method, raise_PageDumped, is added to the FileDumper class. This method is protected because it should only be possible to fire the event within the implementation of the FileDumper class or a derived class. Finally, there is the event metadata that binds all the accessor methods together: .event specialname SampleLib.PageDumpedEventHandler PageDumped { .addon instance void SampleLib.FileDumper::add_PageDumped( class SampleLib.PageDumpedEventHandler) .removeon instance void SampleLib.FileDumper::remove_PageDumped( class SampleLib.PageDumpedEventHandler) .fire instance void SampleLib.FileDumper::raise_PageDumped( object, class SampleLib.PageDumpedEventArgs) } To call the raise_PageDumped method, you can simply use the delegate invocation syntax: void Dump() { pagesDumped = 0; StreamReader^ sr = gcnew StreamReader(FileName); String^ line = nullptr; while (!sr->EndOfStream) { DumpPage(sr, line); ++pagesDumped; if (!sr->EndOfStream) { PageDumpedEventArgs^ ea = gcnew PageDumpedEventArgs(pagesDumped); PageDumped(this, ea); // calls raise_PageDumped(this, ea) if (ea->Cancel) break; } } sr->Close(); } The metadata of the event, including the Category and Description attributes, is read by Visual Studio to display the event in the events view of the Properties window, as Figure 5-9 shows.

JPA supports several ways to retrieve entity instances from the database. By far the simplest way is retrieving an entity by its primary key using the find method we introduced in listing 9.1. The other ways all involve using the query API and JPQL, which we ll discuss in chapter 10. Recall that the find method was used in the addItem method in listing 9.1 to retrieve the Seller instance corresponding to the Item to add:

Seller seller = entityManager.find(Seller.class, sellerId);