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This section shows how you perform basic Create, Read, Update, and Delete (CRUD) operations using JDBC and describes the problems with using basic JDBC. You see how the object model is translated into the relational data model.
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To Start, you will need to create an eclipse project. You will need to install Derby jars and configure
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Creating an Eclipse Project
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To begin developing your Java application, you create a bookshop project in Eclipse. To set up the Derby database, you can install the core and UI plug-ins or download the Derby jar files and add them to your Eclipse project classpath. To install the Derby plug-ins for Eclipse, do the following: 1. 2. 3. Download the plug-ins from http://db.apache.org/derby/releases/release10.5.3.0.cgi. Extract the zip files to your Eclipse home. If Eclipse is located at C:\eclipse, extract the zips to the same location. Restart Eclipse. You should see the Derby jar files derby.jar, derbyclient.jar, derbynet.jar, and derbytools.jar added to your project s classpath. Select your project, and right-click. Select Apache Derby, and then select Add Network Server. Click the Start Derby Network Server button.
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CHAPTER 1 STARTING WITH HIBERNATE
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After the server starts, select the ij option. The SQL prompt appears in the console window. At the prompt, execute the SQL statements from the previous recipe s Creating the Tables (Relational Model) section.
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JDBC Initialization and Cleanup
You must load the JDBC driver and create a connection to that database before you can execute any SQL statements. The JDBC driver for Derby is in the derby.jar file that was added to your project s build path during Derby s installation. Be careful: you must remember to close that connection (whether an exception is raised or not). Connections are a costly resource if they aren t closed after use, the application will run out of them and stop working: Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); Connection connection = DriverManager.getConnection( "jdbc:derby://localhost:1527/BookShopDB", "book", "book"); try { // Using the connection to query or update database } finally { connection.close(); }
Using JDBC to Query a Database
For demonstration purpose, let s query for a book whose ISBN is 1932394419. Here s the JDBC code for this task: PreparedStatement stmt = connection.prepareStatement ("SELECT * FROM BOOK WHERE ISBN = "); stmt.setString(1, "1932394419"); ResultSet rs = stmt.executeQuery(); while (rs.next()) { System.out.println("ISBN : " + rs.getString("ISBN")); System.out.println("Book Name : " + rs.getString("BOOK_NAME")); System.out.println("Publisher Code : " + rs.getString("PUBLISHER_CODE")); System.out.println("Publish Date : " + rs.getDate("PUBLISH_DATE")); System.out.println("Price : " + rs.getInt("PRICE")); System.out.println(); } rs.close(); stmt.close();
Using JDBC to Update a Database
Let s update the title of the book whose ISBN is 1932394419. Here s the JDBC code:
CHAPTER 1 STARTING WITH HIBERNATE
PreparedStatement stmt = connection.prepareStatement( "UPDATE BOOK SET BOOK_NAME = WHERE ISBN = "); stmt.setString(1, "Hibernate Quickly 2nd Edition"); stmt.setString(2, "1932394419"); int count = stmt.executeUpdate(); System.out.println("Updated count : " + count); stmt.close();
Creating the Domain Model
You use normal JavaBeans to build your object/domain model. These JavaBeans are called Plain Old Java Objects (POJOs). This term is used to distinguish them from Enterprise JavaBeans (EJBs). EJBs are Java objects that implement one of the javax.ejb interfaces and that need to be deployed in an EJB container. Note that each of these POJOs must have a no-argument constructor: public class Publisher { private String code; private String name; private String address; // Getters and Setters } public class Book { private String isbn; private String name; private Publisher publisher; private Date publishDate; private int price; private List chapters; // Getters and Setters } public class { private int index; private String title; private int numOfPages; // Getters and Setters } You use a foreign key to reference PUBLISHER from the BOOK table, but it s a many-to-one association represented with a list of chapters in the Book class. You use a foreign key to reference BOOK from the CHAPTER table, but there s nothing referencing the Book class from the class. In contrast, a Book object has a list of objects (one-to-many association). This is a case of an objectrelational mismatch, which focuses on the association between two classes or tables in their corresponding model. To handle the incompatibility of these models, you need to do some conversion/translation when you retrieve and save your object model. This is called object/relational mapping (O/R Mapping or ORM). Let s say your Bookshop sells audio and video discs. In the object-oriented model, this can be represented by using a Disc superclass and two subclasses called AudioDisc and VideoDisc (see Figure 1-4). On the relational database side, you don t have a way to map this inheritance relationship. This is a major object-relational system mismatch.
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