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The Common Gateway Interface (CGI) is a standard for interfacing external applications with information servers, such as HTTP or web servers. A plain HTML document that the web daemon retrieves is static, which means it exists in a constant state: a text file that doesn t change. A CGI (http://www.cgi101.com/book/) program, on the other hand, is executed in real time so that it can output dynamic information. CGI is a proven architecture, but it has had some major limitations that create significant problems when you are trying to develop enterprisewide web solutions: Difficulty in maintaining state and session connection (there is no session concept; therefore a state cannot be kept). Performance bottlenecks (resource-intensive scripts could cause performance problems). Can involve proprietary APIs. Malicious scripts could crash the HTTP server; CGI scripts run as a separate process from the HTTP server, which isolates the server from most script errors; however, operating system errors do exist, and scripts that crash UNIX systems can be found on the Web. In general, compared to Java programs, CGI scripts are unreadable. There is a newer architecture (Java servlets a servlet is a small Java class) that not only solves these problems but also provides code portability, plus the ability to allow your serverside application to interface with a wide range of relational databases. This architecture is using JDBC with Java servlets to replace CGI.

ResultSet.TYPE_SCROLL_INSENSITIVE: The constant indicating the type for a ResultSet object that is scrollable but generally not sensitive to changes made by others. Insensitive cursors are ideal for database applications that require high levels of concurrency on the database server and require the ability to scroll forward and backward through result sets. The first request to an insensitive cursor fetches all the rows and stores them on the client. Therefore, the first request is very slow when long data is retrieved. Note that subsequent requests do not require any network traffic and are processed quickly. ResultSet.TYPE_SCROLL_SENSITIVE: The constant indicating the type for a ResultSet object that is scrollable and generally sensitive to changes made by others. Using sensitive cursors, each request generates network traffic; therefore, performance can be very slow.

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You have several images on the web page and you want to display them pagewise, where a page may contain one or more images (depending on the space on the web page). At the top of the image, you want the numbers to represent the page numbers. You want the image of the selected page number to be displayed on the screen.

A batch update is a set of multiple update statements (such as SQL s UPDATE and INSERT statements) submitted to the database for processing as one. Sending multiple update statements to the database together as a unit can, in some situations, be much more efficient than sending each update statement separately. You can use the java.sql.Statement, java.sql.PreparedStatement, and java.sql. CallableStatement objects to submit batch updates. The Oracle and MySQL JDBC drivers allow you to accumulate SQL INSERT, SQL DELETE, and SQL UPDATE operations of Statement and PreparedStatement objects at the client and send them to the database server in batches. This feature reduces round-trips to the database server; therefore, this can improve the performance of database applications.

A servlet is a web component that generates dynamic content. Servlets are small, platformindependent Java classes compiled to an architecture-neutral bytecode that can be loaded dynamically into and run by a servlet container. Servlets interact with web clients via a request-response paradigm implemented by the servlet container. This request-response model is based on the behavior of HTTP. Servlets allow state, can use the JDBC API, and have a significant performance increase because they have no heavy process startup and initialization for each client request as CGI does. According to Sun (http://www.sun.com), a servlet is a Java programming language class used to extend the capabilities of servers that host applications accessed via a requestresponse programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers. For such applications, Java servlet technology (Figure 8-3) defines HTTP-specific servlet classes. The javax.servlet and javax.servlet.http packages provide interfaces and classes for writing servlets. All servlets must implement the Servlet interface, which defines life-cycle methods.

The following code illustrates batch updates using the java.sql.Statement object: Connection conn = null; Statement stmt = null; try { // get a valid Connection object conn = ... // turn off autocommit // and start a new transaction conn.setAutoCommit(false); stmt = conn.createStatement(); stmt.addBatch( "INSERT INTO books_table(isbn, author) VALUES ('11223344', 'Donald Knuth')"); stmt.addBatch( "INSERT INTO books_table(isbn, author) VALUES ('11223355', 'Donald Knuth')"); stmt.addBatch( "INSERT INTO dept_table(name, city) VALUES ('software', 'New York')"); stmt.addBatch( "INSERT INTO dept_table(name, city) VALUES ('marketing', 'Los Gatos')"); stmt.addBatch("delete from dept_table where name = 'hardware'"); // submit a batch of update commands for execution int[] updateCounts = stmt.executeBatch(); // commit the transaction conn.commit(); } catch(Exception e) { // handle the exception

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