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ORM frameworks also have some disadvantages: Learning curve: You may experience a steep learning curve as you learn how to map and, possibly, learn a new query language. Overhead: For simple applications that use a single database and data without many business requirements for complex querying, an ORM framework can be extra overhead. Slower performance: For large batch updates, performance is slower.

Your first step is to create a web service that implements the business logic. Your requirements for this service are simple.

While a program is running, its data must be stored in memory. How much memory is required for an item, and where and how it is stored, depends on its type. A running program uses two regions of memory to store data: the stack and the heap.

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The service will contain one operation named getGreeting. This operation must take a string argument that s a name of a person. The service returns a string greeting that includes the name argument. getGreeting(String name) : String You ll implement this web service using the JDK 1.5 with annotations, using Workshop to create the source files and Ant to build your project. You need to have completed the installation process defined in 2. You ll find the complete source code for this exercise in the Source Code/Download area at http://www.apress.com. Begin by starting the Workshop IDE by selecting BEA Products Workshop for WebLogic Platform from the Start menu. If it prompts you to select a workspace, select the workspace that you created in 2. After Workshop loads, right-click in the Package Explorer tab (on the left side of the IDE) and select New Project from the pop-up menu. This brings up the New Project dialog, shown in Figure 3-1.

The system takes care of all stack manipulation. You, as the programmer, don t need to do anything with it explicitly. But understanding its basic functions will give you a better understanding of what your program is doing when it is running, and allow you to better understand the C# documentation and literature. The stack is an array of memory that acts as a last-in, first-out (LIFO) data structure. It stores several types of data: The values of certain types of variables The program s current execution environment Parameters passed to methods

Hibernate is one of the most widely used ORM frameworks in the industry. It provides all the benefits of an ORM solution and implements the Java Persistence API (JPA) defined in the Enterprise JavaBeans (EJB) 3.0 specification. Its main components are as follows: Hibernate Core: The Core generates SQL and relieves you from manually handling Java Database Connectivity (JDBC) result sets and object conversions. Metadata is defined in simple XML files. The Core offers various options for writing queries: plain SQL; Hibernate Query Language (HQL), which is specific to Hibernate; programmatic criteria, or Query by Example (QBE). It can optimize object loading with various fetching and caching options. Hibernate Annotations: With the introduction of Annotations in JDK 5.0, Hibernate provides the option of defining metadata using annotations. This reduces configuration using XML files and makes it simple to define required metadata directly in the Java source code. Hibernate EntityManager: The JPA specification defines programming interfaces, lifecycle rules for persistent objects, and query features. The Hibernate implementation for this part of the JPA is available as Hibernate EntityManager.

The general characteristics of stacks are the following: Data can only be added to and deleted from the top of the stack. Placing a data item at the top of the stack is called pushing the item onto the stack. Deleting an item from the top of the stack is called popping the item from the stack. Figure 3-6 illustrates the functions and terminology of the stack.

Figure 3-1. Workshop s New Project wizard Select the Web Service Project in the Web Services folder and click the Next button. Name the project Hello World. The Target Runtime should default to BEA WebLogic 9.2 if you re using ALSB version 2.5 or later. Click the Next button. On the Select Project Facets page of the New Project wizard, you need to select the facets of your project, as shown in Figure 3-2. For your purposes, the defaults are fine. Click the Next button.

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