c# print document barcode Setting up the project in Java

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Setting up the project
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We assume that you ve downloaded the latest production release of Hibernate from the Hibernate website at http://www.hibernate.org/ and that you unpacked the archive. You also need Apache Ant installed on your development machine.
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You should also download a current version of HSQLDB from http://hsqldb.org/ and extract the package; you ll use this database management system for your tests. If you have another database management system already installed, you only need to obtain a JDBC driver for it. Instead of the sophisticated application you ll develop later in the book, you ll get started with a Hello World example. That way, you can focus on the development process without getting distracted by Hibernate details. Let s set up the project directory first. Creating the work directory Create a new directory on your system, in any location you like; C:\helloworld is a good choice if you work on Microsoft Windows. We ll refer to this directory as WORKDIR in future examples. Create lib and src subdirectories, and copy all required libraries:
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WORKDIR +lib antlr.jar asm.jar asm-attrs.jars c3p0.jar cglib.jar commons-collections.jar commons-logging.jar dom4j.jar hibernate3.jar hsqldb.jar jta.jar +src
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The libraries you see in the library directory are from the Hibernate distribution, most of them required for a typical Hibernate project. The hsqldb.jar file is from the HSQLDB distribution; replace it with a different driver JAR if you want to use a different database management system. Keep in mind that some of the libraries you re seeing here may not be required for the particular version of Hibernate you re working with, which is likely a newer release than we used when writing this book. To make sure you have the right set of libraries, always check the lib/ README.txt file in the Hibernate distribution package. This file contains an up-todate list of all required and optional third-party libraries for Hibernate you only need the libraries listed as required for runtime. In the Hello World application, you want to store messages in the database and load them from the database. You need to create the domain model for this business case.
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Creating the domain model Hibernate applications define persistent classes that are mapped to database tables. You define these classes based on your analysis of the business domain; hence, they re a model of the domain. The Hello World example consists of one class and its mapping. Let s see what a simple persistent class looks like, how the mapping is created, and some of the things you can do with instances of the persistent class in Hibernate. The objective of this example is to store messages in a database and retrieve them for display. Your application has a simple persistent class, Message, which represents these printable messages. The Message class is shown in listing 2.1.
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Listing 2.1 Message.java: a simple persistent class
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package hello;
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Identifier public class Message { attribute private Long id; private String text; private Message nextMessage;
Message() {} public Message(String text) { this.text = text; } public Long getId() { return id; } private void setId(Long id) { this.id = id; } public String getText() { return text; } public void setText(String text) { this.text = text; }
Message text Reference to another Message instance
public Message getNextMessage() { return nextMessage; } public void setNextMessage(Message nextMessage) { this.nextMessage = nextMessage; } }
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The Message class has three attributes: the identifier attribute, the text of the message, and a reference to another Message object. The identifier attribute allows the application to access the database identity the primary key value of a persistent object. If two instances of Message have the same identifier value, they represent the same row in the database. This example uses Long for the type of the identifier attribute, but this isn t a requirement. Hibernate allows virtually anything for the identifier type, as you ll see later. You may have noticed that all attributes of the Message class have JavaBeansstyle property accessor methods. The class also has a constructor with no parameters. The persistent classes we show in the examples will almost always look something like this. The no-argument constructor is a requirement (tools like Hibernate use reflection on this constructor to instantiate objects). Instances of the Message class can be managed (made persistent) by Hibernate, but they don t have to be. Because the Message object doesn t implement any Hibernate-specific classes or interfaces, you can use it just like any other Java class:
Message message = new Message("Hello World"); System.out.println( message.getText() );
This code fragment does exactly what you ve come to expect from Hello World applications: It prints Hello World to the console. It may look like we re trying to be cute here; in fact, we re demonstrating an important feature that distinguishes Hibernate from some other persistence solutions. The persistent class can be used in any execution context at all no special container is needed. Note that this is also one of the benefits of the new JPA entities, which are also plain Java objects. Save the code for the Message class into your source folder, in a directory and package named hello. Mapping the class to a database schema To allow the object/relational mapping magic to occur, Hibernate needs some more information about exactly how the Message class should be made persistent. In other words, Hibernate needs to know how instances of that class are supposed to be stored and loaded. This metadata can be written into an XML mapping document, which defines, among other things, how properties of the Message class map to columns of a MESSAGES table. Let s look at the mapping document in listing 2.2.
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