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Figure 6-3. ProductDisplayer controls as seen at design time in the Visual Studio IDE Now you need to set each ProductDisplayer control s ProductID, ImageUrl, ProductName, and UnitPrice properties, because these properties tell the ProductDisplayer control what image and text to display, and what product to add to the cart. Right-click on the top-left control and select Properties from the context menu. Visual Studio s Properties window should now be visible, and it should display a list of properties similar to those shown in Figure 6-4.

2

lthough only one name appears on the cover of this book, the credit for this accomplishment goes to many I would like to first thank Java editor Steve Anglin for taking up the second edition of this book Special thanks go to Kylie Johnston, project manager; Candace English, copy editor; and Linda Marousek, production editor, for their splendid job in organizing, copy editing, and production of this book They have put down a great effort in making this book accurate, timely, and consistent throughout Without their careful eyes, many mistakes might have made their way into this book I am immensely thankful to Jeff Heaton, technical reviewer, who provided many ideas and suggested numerous improvements in this second edition It feels great to have his name associated with both editions of this book.

Before you get knee deep in SQL, let s discuss a common issue that many people accidentally overlook, usually with frustrating or devastating consequences, depending on the situation. Strings in SQL are represented as text surrounded by single quotes. So, you may see a SQL statement like this:

UPDATE [Customer] SET [LastName]='Smith' WHERE [ID]=50;

In this chapter you will learn how to combine Java and C code in an elegant manner by building a simple Java application on top of a native library. You will learn exciting concepts about the Java Native Interface (JNI) and the API used to combine Java and C in a single unit, including how to load native libraries, how to use the native keyword, how to generate the JNI headers, plus all about method signatures, Java arrays vs. C arrays, invoking Java methods, compiling and packing the product, and more.

An issue arises when you want to use a string in SQL that contains a single quote, because it terminates your string prematurely. For example, say you are dealing with a last name like O Reilly: UPDATE [Customer] SET [LastName]='O'Reilly' WHERE [ID]=50; --THIS IS AN INVALID SQL STATEMENT This SQL statement never runs because the SQL parser sees the string 'O' and fails because no keyword name Reilly exists. Furthermore, there is an unterminated string ' WHERE [ID]=50 at the end of the statement, adding insult to injury.

I must thank Paul Burden and Ashish Patel, two of my esteemed colleagues, for encouraging me to do this second edition by contributing ideas during the course of many discussions I take this opportunity to express my deepest gratitude and convey my most humble regards to Professor TV Prabhakar, Department of Computer Science and Engineering, Indian Institute of Technology, Kanpur, India, who initiated me into the world of computer science Without his most valuable and affectionate guidance, it just could not have been the same Lastly, my parents and my elder brother (whom I call dadabhai) and my sister-in-law (whom I call boudi) have been a source of constant inspiration and encouragement throughout I offer them my sincerest regards, and words cannot express my gratitude to them My wife, Sumita, has encouraged and supported me throughout this period and sacrificed many hours that we could have been together.

Unfortunately, grief is not the only thing you have to worry about it when it comes to single quotes Malicious users can actually use single quotes to gain access to poorly designed login systems or even destroy data It s known as a SQL injection attack, and it involves using single quotes and the comment character (--) to inject malicious SQL code into a statement.