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Chapter 8. Writing to Web Databases
Many web database applications are not only information resources for
users but also tools for storing new information. For example, in an
online store, users and administrators write data to the database in
several situations: they can purchase products by creating an order,
they can become members, they can manage a shopping cart, and the
administrator can manage the stock.Writing data in web database applications requires different
techniques from reading data. Issues of transactions and concurrency
become important, and we introduce these issues and the principles of
dealing with them in this chapter. The introduction is practical: we
focus on the basic management techniques of locking and unlocking
tables, and show you how to safely implement simple database writes
in MySQL when there is more than one user simultaneously accessing a
database. Most importantly, we identify when special approaches are
required, and when these can be safely omitted from a web database
application.At the conclusion of this chapter, you will have covered the skills
to build a simple but complete web database application.
