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Data in an XML document is contained in an XML tree, which consists mainly of a set of nested elements. The element is the fundamental constituent of an XML tree. Every element has a name and can contain data. Some can also contain other, nested elements. Elements are demarcated by opening and closing tags. Any data contained by an element must be between its opening and closing tags. An opening tag starts with an open angle bracket, followed by the element name, followed optionally by any attributes, followed by a closing angle bracket. <PhoneNumber> A closing tag starts with an open angle bracket, followed by a slash character, followed by the element name, followed by a closing angle bracket. </PhoneNumber> An element with no content can be represented by a single tag that starts with an open angle bracket, followed by the name of the element, followed by a slash, and is terminated with a closing angle bracket. <PhoneNumber /> The following XML fragment shows an element named EmployeeName followed by an empty element named PhoneNumber. <EmployeeName>Sally Jones</EmployeeName> Opening tag Content Closing tag <PhoneNumber /> Element with no content Other important things to know about XML are the following: XML documents must have a single root element that contains all the other elements. XML tags must be properly nested. Unlike HTML tags, XML tags are case sensitive. XML attributes are name/value pairs that contain additional metadata about an element. The value part of an attribute must always be enclosed in quotation marks, which can be either double quotation marks or single quotation marks. White space within an XML document is maintained. This is unlike HTML, where whitespace is consolidated to a single space in the output.

You can modify any persistent object that is associated with a session and a persistence context. Its state is then synchronized with the database: Session session = getSession(); Transaction tx = session.beginTransaction(); Book book = (Book) session.get(Book.class, new Long(294912)); book.setName("Book Name - hibernate 2"); tx.commit(); session.close(); The entity is retrieved from the database and modified in the same transaction. The modifications are propagated to the database when the commit() method is called. The persistence context identifies the changes that have been made to the entity s state and synchronizes with the database. This is called automatic dirty checking. The implementation in JPA is as follows: EntityManager manager = SessionManager.getEntityManager(); EntityTransaction tran = manager.getTransaction(); tran.begin(); Book book = manager.find(Book.class, new Long(294912)); book.setBookName("Book Name - hibernate 22"); tran.commit(); manager.close();

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The following XML document is an example of XML that contains information about two employees. This XML tree is extremely simple in order to show the elements clearly. The important things to notice about the XML tree are the following: The tree contains a root node of type Employees that contains two child nodes of type Employee. Each Employee node contains nodes containing the name and phone numbers of an employee. <Employees> <Employee> <Name>Bob Smith</Name> <PhoneNumber>408-555-1000</PhoneNumber> <CellPhone /> </Employee> <Employee> <Name>Sally Jones</Name> <PhoneNumber>415-555-2000</PhoneNumber> <PhoneNumber>415-555-2001</PhoneNumber> </Employee> </Employees> Figure 21-13 illustrates the hierarchical structure of the sample XML tree.

LINQ to XML can be used to work with XML in two ways. The first way is as a simplified XMLmanipulation API. The second way is to use the LINQ query facilities you ve seen throughout the earlier part of this chapter. I ll start by introducing the LINQ to XML API. The LINQ to XML API consists of a number of classes that represent the components of an XML tree. The three most important classes you will use are XElement, XAttribute, and XDocument. There are other classes as well, but these are the main ones. In Figure 21-13, you saw that an XML tree is a set of nested elements. Figure 21-14 shows the classes used to build an XML tree and how they can be nested. For example, the figure shows the following: An XDocument node can have as its direct child nodes: At most, one of each of the following node types: an XDeclaration node, an XDocumentType node, and an XElement node Any number of XProcessingInstruction nodes If there is a top-level XElement node under the XDocument, it is the root of the rest of the elements in the XML tree. The root element can in turn contain any number of nested XElement, XComment, or XProcessingInstruction nodes, nested to any level.

In this chapter we saw how .NET Service Bus solves two major problems: How to get service requests through a firewall How to discover service endpoints

You can delete from the database any persistent object that is associated with a session and a persistence context. To do so, you call the delete() method: Session session = getSession(); Transaction tx = session.beginTransaction(); Book book = (Book) session.get(Book.class, new Long(294912)); session.delete(book); tx.commit(); session.close(); The entity is in the removed state after the call to delete(). The database record is deleted after the transaction is committed, and the object is in the transient state after the session is closed. In JPA, the remove() method performs the same function as the delete() method: EntityManager manager = SessionManager.getEntityManager(); EntityTransaction tran = manager.getTransaction(); tran.begin(); Book book = manager.find(Book.class, new Long(294912)); manager.remove(book); tran.commit(); manager.close();

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