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When a User entity is first created in the database, the persistence provider does not include the USER_ID as part of the generated INSERT statement. Instead, we could be populating the USER_ID column through an INSERT-induced trigger on the database server side. Similarly, since it does not make much sense to update a generated key, it is not included in the UPDATE statement for the entity either. The rest of the parameters of the @Column annotation are only used for automatic table generation and specify column creation data. The nullable parameter specifies whether the column supports null values C, the unique parameter b indicates if the column has a unique constraint, the length parameter D specifies the size of the database column, the precision parameter E specifies the precision of a decimal field, and the scale parameter F specifies the scale of a decimal column. Finally, the columnDefinition parameter allows you to specify the exact SQL to create the column.

We won t cover these parameters much further than this basic information since we do not encourage automatic table creation. Note that the @Column annotation is optional. If omitted, a persistent field or property is saved to the table column matching the field or property name. For example, a property specified by the getName and setName methods will be saved into the NAME column of the table for the entity. Next, let s take a look at a few more annotations applied to entity data, starting with @Enumerated.

The first catch block in this code catches C++ exceptions of type int, and the second one catches any CTS-compliant managed exceptions. When a C++ exception of a type other than int is thrown, the CLR s exception mapping mechanism will detect this and map the exception to a managed exception. Since the SEH exception code of a C++ exception (0xE06d7363) is not handled specially, the runtime maps it to an SEHException. You should always catch C++ exceptions before you catch managed exceptions of type System::Object^, System::Exception^, System::SystemException^, System::Runtime::InteropServices::ExternalException^, and System::Runtime::InteropServices::SEHException^. The first four types mentioned are base classes of SEHException. If a C++ exception is thrown and a catch block for one of the exceptions mentioned here is found, the runtime will map the exception to an SEHException. In the following code, the exception handler for int would never be executed: int main() { try { f(); } catch (Exception^ ex) { Console::WriteLine(ex->GetType()->FullName); } catch (int i) { Console::WriteLine("int exception, value={0}", i); } }

Languages like C and Pascal have had enumerated data types for decades. Enumerations were finally introduced in Java 5. In case you are unfamiliar with them, we ll start with the basics. In listing 8.4, the user type field has a type of UserType. UserType is a Java enumeration that is defined as follows:

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

public enum UserType {SELLER, BIDDER, CSR, ADMIN};

This effectively means that any data type defined as UserType (like our persistent field in the User object) can only have the four values listed in the enumeration. Like an array, each element of the enumeration is associated with an index called the ordinal. For example, the UserType.SELLER value has an ordinal of 0, the UserType.BIDDER value has an ordinal of 1, and so on. The problem is determining how to store the value of enumerated data into the column. The Java Persistence API supports two options through the @Enumerated annotation. In our case, we specify that the ordinal value should be saved into the database:

@Enumerated(EnumType.ORDINAL) ... protected UserType userType;

Table 2-1 shows commonly used primitives provided by the runtime. Table 2-1. CTS Primitives and C++/CLI Type Names

This means that if the value of the field is set to UserType.SELLER, the value 0 will be stored into the database. Alternatively, you can specify that the enumeration value name should be stored as a String:

@Enumerated(EnumType.STRING) ... protected UserType userType;

Handles listener messages and performs the appropriate actions on the router service environment. Used in a user-mode listener implementation. Provides support for consuming, applying, processing, and generating policy on a specific port. Manages the WCF remoting infrastructure. Creates SendRequestChannel objects through which messages can be sent and replies received. Controls the consumption and application of routing and transport policy. Represents the factory for rules, and through its namespace hierarchy, the associated properties. Controls application security requirements either programmatically or by using application and machine configuration files. Manages the associations between communication channels and service instances; registers services; and produces typed channels to make requests of other services. Represents the base class for a transaction manager. Manages creation and deletion of the participants in a dialog.

In this case a UserType.ADMIN value would be saved into the database as "ADMIN". By default an enumerated field or property is saved as an ordinal. This would be the case if the @Enumerated annotation is omitted altogether, or no parameter to the annotation is specified.