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Another strategy for debugging is to use a source code analyzer. Even though your program may compile without any warnings or errors, there can be subtle problems lurking. Analyzers use sets of rules that describe common programming pitfalls and potential mistakes. They then apply these rules to your source code and give you warnings about possible problems. You can then investigate further and determine whether or not a change is necessary. The most famous source code analyzer is lint. lint has been available on UNIX systems for many years, but it was too difficult to use to garner widespread use. A free reimplementation of lint is called Splint (http://www.splint.org). The Splint project aims to be an easier-to-use, more thorough lint. One drawback to Splint is that it works only with C code. There are several commercial lint-like products available that also work with C++ code. Two of the more popular are Gimpel s FlexeLint (http://www.gimpel.com) and Parasoft s CodeWizard (http://www.parasoft.com). In addition to the standard checks, CodeWizard even has rules corresponding to Scott Meyers s Effective C++ books.

and closing database connections with no impact on functionality. You can learn more about this technology at http://www.php.net/manual/en/features.persistent-connections.php.

Creating a network application, especially one for the Internet, carries with it added responsibilities. You must take great care when coding the server and client to keep malicious users and programs from wreaking havoc with your application. In addition to crashing your application, security can also be compromised. Here we will focus on the stability aspects; the security issues are covered in 12. In this section we will look at four key areas that you should consider when writing your network application.

The alternative solution, and the one you ll use when implementing HatShop, can be described like this: 1. Open a connection to the database the first time you need to access the database during a request.

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One of the most common errors in network applications is the buffer overflow. A buffer overflow condition exists when data is written beyond the limit of the allocated memory. Figure 8-3 shows the layout for a stack record. Note that the memory for the local variables will be written from bottom to top. An overflow usually occurs when data submitted from a client exceeds the amount expected by the server. The return address for the function can be overwritten, causing the application to behave in an undefined manner. Furthermore, part of the overflowing data can be interpreted as machine instructions that can be executed using the permissions of the process. This is called stack smashing.

2. Execute all database functions (or SQL queries) through that connection without closing it. Here you also need to handle any possible errors. 3. Close the database connection when the client request finishes processing. Using this method, all database operations that happen for a single client request (which happens each time a user visits a new page of our site) will go through a single database connection, avoiding opening and closing the connection each time you need something from the database. You ll still use persistent connections to improve the efficiency of opening a new database connection for each client request. This solution is the one you will use for data access in the HatShop project.

8

After the return address is overwritten, your application s behavior is undefined In the best case, it will crash, but in the worst case, it will continue to function erratically A buffer overflow is a very hard bug to diagnose and fix The best place to find and fix buffer issues is during development Many tools are available for use during testing that can point out memory management issues The two most popular are Electric Fence and Valgrind Electric Fence (http://perenscom/FreeSoftware) was developed by Bruce Perens and was one of the earliest solutions available It works by redefining malloc() and free() You simply compile a special version of your application that links against Electric Fence and start testing It will halt your program whenever a memory error is encountered Valgrind (http://valgrindkdeorg) has become extremely popular of late.

Now you should learn the theory about how to put this in practice using PHP PDO. You ll effectively write the code a bit later, when building the added functionality into the web site. As explained in 2, you won t access PostgreSQL through PHP s PostgreSQLspecific database functions but through a database abstraction layer (PHP PDO). The PDO classes permit accessing various data sources using the same API (Application Programming Interface), so you won t need to change the PHP data access code or learn different dataaccess techniques when working with database systems other than PostgreSQL (but you might need to change the SQL code itself if the database you migrate to uses a different dialect). Using PHP PDO makes your life as a programmer easier in the long run. The important PHP PDO class you ll work with is PDO, which provides methods for performing various database operations.

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