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Except for its special significance in designating the mapping to the primary key column, an id mapping is almost the same as the basic mapping. The other main difference is that id mappings are generally restricted to the following types: Primitive Java types: byte, int, short, long, char Wrapper classes of primitive Java types: Byte, Integer, Short, Long, Character String: java.lang.String Large numeric type: java.math.BigInteger Temporal types: java.util.Date, java.sql.Date

As the name suggests, Spring MVC provides first-class components to build web applications following the MVC pattern. Like any good web framework, Spring MVC helps build the controller layer. It is flexible and supports a variety of components for view management, including core Java EE technologies such as JSP and others such as Extensible Stylesheet Language (XSL) and Portable Document Format (PDF). As shown in Figure 2-2, the HTTP request from the client s web browser is first intercepted by the controller component. This consists of a gateway servlet that acts as a single entry point into the application. The servlet then delegates successive user requests to respective handlers called page controllers. Page controllers are simple Java classes that execute one application use case and invoke the business services. Spring

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Floating point types such as float and double are permitted, as well as the Float and Double wrapper classes and java.math.BigDecimal, but they are discouraged because of the nature of rounding error and the untrustworthiness of the equals() operator when applied to them. Using floating types for primary keys is a risky endeavor and definitely not recommended.

Sometimes applications do not want to be bothered with trying to define and ensure uniqueness in some aspect of their domain model and are content to let the identifier values be automatically generated for them. This is called id generation and is specified by the @GeneratedValue annotation. When id generation is enabled, the persistence provider will generate an identifier value for every entity instance of that type. Once the identifier value is obtained, the provider will insert it into the newly persisted entity; however, depending on the way it is generated, it might not actually be present in the object until the entity has been inserted in the database. In other words, the application cannot rely on being able to access the identifier until after either a flush has occurred or the transaction has completed. Applications can choose one of four different id generation strategies by specifying a strategy in the strategy element. The value can be any one of AUTO, TABLE, SEQUENCE, or IDENTITY enumerated values of the GenerationType enumerated type. Table and sequence generators can be specifically defined and then reused by multiple entity classes. These generators are named and are globally accessible to all the entities in the persistence unit.

Minimize coupling between the presentation tier and the business tier. Hide infrastructure issues from the business service clients.

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If an application does not care what kind of generation is used by the provider but wants generation to occur, it can specify a strategy of AUTO. This means that the provider will use whatever strategy it wants to generate identifiers. Listing 4-14 shows an example of using automatic id generation. This will cause an identifier value to be created by the provider and inserted into the id field of each Employee entity that gets persisted. Listing 4-14. Using Auto Id Generation @Entity public class Employee { @Id @GeneratedValue(strategy=GenerationType.AUTO) private int id; // ... } There is a catch to using AUTO, though. The provider gets to pick its own strategy to store the identifiers, but it needs to have some kind of persistent resource in order to do so. For example, if it chooses a table-based strategy, it needs to create a table; if it chooses a sequence-based strategy, it needs to create a sequence. The provider can t always rely on the database connection that it obtains from the server to have permissions to create a table in the database. This is normally a privileged operation that is often restricted to the DBA. There will need to be some kind of creation phase or schema generation to cause the resource to be created before the AUTO strategy is able to function.

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