By Cristian Darie
There's not anything extra problematical then facing blunders crammed code. I spent days attempting to get the code in bankruptcy 3 to run sooner than submitting this booklet within the around dossier. No errata at the Apress website and the downloaded code from the author's website is completely various from the booklet. The downloaded code doesn't run both. don't waste a while or cash in this ebook.
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Additional resources for Beginning PHP and MySQL E-Commerce: From Novice to Professional
String. php. Summary Hey, we covered a lot of ground in this chapter, didn’t we? We talked about the three-tier architecture and how it helps you create great flexible and scalable applications. We also saw how each of the technologies used in this book fits into the three-tier architecture. If you feel overwhelmed, please don’t worry. In the next chapter, we will begin to create the first part of our site. We will explain each step as we go, so you will have a clear understanding of each element of the application.
Even if it’s unlikely that you want to forbid a customer from adding a product to the shopping cart if the product is not in stock, the example (described in Figure 2-3) is good enough to present in yet another way how each of the three tiers has a different purpose. Figure 2-3. Example of information exchange among application tiers The Right Logic for the Right Tier Because each layer contains its own logic, sometimes it can be tricky to decide where exactly to draw the lines between tiers.
However, if you haven’t worked with databases until now, it might be less than obvious that MySQL is more than a simple store of data. Apart from the actual data stored inside, MySQL is also capable of storing logic in the form of stored procedures, to maintain table relationships, to ensure various data integrity rules are obeyed, and so on. You can communicate with MySQL through SQL, which is a language used to interact with the database. ” Although it’s possible to compose SQL statements in your PHP code and then submit them for execution, this is generally a bad practice, because it incurs security, consistency, and performance penalties.