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There are many different types of exceptions that can occur in a program. The BCL defines a number of exception classes, each representing a specific type. When one occurs, the CLR Creates an exception object for the type Looks for an appropriate catch clause to handle it All exception classes are ultimately derived from the System.Exception class. A portion of the exception inheritance hierarchy is shown in Figure 11-2.

In this exercise, we are going to build an example to host a WCF service from Windows Azure. Following are the steps we need to perform to reach this goal. 1. From Visual Studio, create a new cloud service web role service project called HostWCFService as shown in Figure 4-1.

The simplest way to map a one-to-one association is to treat it as a many-to-one association but add a unique constraint on it. You can declare the lazy, fetch, and cascade attributes in the same way.

Figure 11-2. Structure of the exception hierarchy An exception object contains read-only properties with information about the exception that caused it. Some of these properties are shown in Table 11-1. Table 11-1. Selected Properties of an Exception Object

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This property contains an error message explaining the cause of the exception. This property contains information describing where the exception occurred. If the current exception was raised by another exception, this property contains a reference to the previous exception. This property can be set by application-defined exceptions to give a URN or URL for information on the cause of the exception. If not set by an application-defined exception, this property contains the name of the assembly where the exception originated.

Figure 4-1. Create a cloud web role service, HostWCFService, from Visual Studio 2. Create a DLL library project called AzureForDotNetDeveloperWCFServiceLibrary. In this project we define a WCF service contract interface, IUserRegisterService, and a data contract class, User, as Listing 4-1 shows. The service contract interface, IUserRegisterService, has two operation contracts defined. AddUser() (taking an instance of User as a parameter) is used to provide a service to add a user when a user registers to a cloud application. GetUserList() is used to retrieve the collection of users who have registered to a cloud application.

The catch clause handles exceptions. There are three forms, allowing different levels of processing. The forms are shown in Figure 11-3.

You can use the Customer and Address classes to create a one-to-one mapping with a foreign key association. (The classes Customer and Address remain the same they re renamed for the sake of demonstration.) Customer s Hibernate mapping maps the Address property as many-to-one association. The unique constraint is set to true to change this association from many-to-one to one-to-one: <hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Customer5_2" table="CUSTOMER" schema="BOOK5"> <id name="id" type="long" column="ID"> <generator class="native"></generator> </id> <property name="firstName" type="string" column="FIRST_NAME" /> <property name="lastName" type="string" column="LAST_NAME" /> <property name="idCardNo" type="string" column="ID_CARD_NO" /> <property name="countryCode" type="string" column="COUNTRY_CODE" /> <property name="email" type="string" column="EMAIL" /> <many-to-one name="address" class="com.hibernaterecipes.chapter5.Address5_2" column="ADDRESS_ID" cascade="save-update" unique="true"> </many-to-one> </class> </hibernate-mapping> To obtain bidirectionality, you add a one-to-one mapping to the customer property in the Address class. You use the property_ref attribute to point Hibernate to the property to which the association is one-to-one; this is called an inverse property reference: <hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Address5_2" table="ADDRESS" schema="BOOK5"> <id name="id" type="long" column="ADDRESS_ID" > <generator class="native">

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