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The Qt SQL module makes it possible to access almost any conceivable database in a crossplatform manner. In fact, the SQL database drivers are plugins, so if you need to access a custom database, you can still write a driver and use Qt s classes to access it. In most cases, it is easier to get an ODBC driver for such a database and use that as a layer between Qt and the database in question. When accessing databases, use the QSqlDatabase class to represent a connection. The database module has a default connection, so you can avoid lots of extra fuzz as long as you stick to using one connection at a time. After you have connected to a database, use the QSqlQuery class to pass SQL queries to the database. Be aware of SQL dialects, however what one database accepts as a valid statement can be considered invalid by another. It is important to try all SQL statements before releasing a product because they are not checked for errors during compilation. You can often avoid having to query the database and transforming the results into something that you can show your users by using the SQL models that are a part of the SQL module. The available models are QSqlQueryModel, QSqlTableModel, and QSqlRelationalTableModel. Try to use these models as often as possible they can save you a lot of time and effort.
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CHAPTER
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supports IP-based connections made with both transmission control protocol (TCP) and user datagram protocol (UDP) sockets. Additionally, Qt supports client-side implementations of the HTTP and FTP protocols, which help with creating FTP clients and HTTP-based downloading. All these classes are kept in a separate networking module of Qt. This chapter starts with a discussion of client-side protocols and how they can be used for downloading data (the client side of the protocols is the code used when interacting with a server). You will also have a quick look at the QUrl class, which is used for handing URLs and their different parts. The latter half of the chapter discusses TCP and UDP socket classes and how you can implement both servers and clients.
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All Qt classes used for networking are a part of the QtNetwork module. This module is not available in all closed source editions of Qt, but it is included in the open source release. This means that if you plan to use it in your closed source Qt project, you must have access to the module first. After you make sure that you have access to the module, you need to include it in your build process by telling QMake that you are using it (add the line reading QT += network to your project file).
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Working with Client Protocols
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The QFtp and QHttp classes encapsulate the FTP and HTTP protocols. Keep in mind that both classes implement only the client side of these protocols, so if you want to create an FTP server or a HTTP server, you have to turn to the TCP server and socket classes (introduced later in this chapter). Comparing FTP and HTTP shows that although both protocols work in the same problem domain, FTP is a slightly more complex protocol. For instance, the FTP protocol depends on a state in which a connection is established and then used before it is closed. HTTP on the other , hand, is stateless it treats every request separately from the others. However, both protocols are used in the same manner from the viewpoint of an application developer. A protocol object is created (either a QFtp object or a QHttp object). When a method is called, the requested action is performed asynchronously, meaning that the
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