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These collections let you access items individually (using a method such as at or value) and iterate across the entire contents of the collection. These collections provide both STL-style iterators and a simpler Qt iterator to permit you to traverse the collection, visiting each item. The example at the end of the chapter shows you how to enumerate through the values in a QMap. It s worth observing that the QString class, intended to represent strings of characters, isn t actually a collection class, but provides similar methods for inserting and removing characters from a string. The QString class also provides the usual methods you d expect of a container of characters, including methods to format non-string values such as integers or floats, compare two strings, find and replace contents of a string, and so forth.

The following command returns the name of the department that has the department_id of 1. In your case, the returned value is Holiday, but you would receive no results if there was no department with an ID of 1. SELECT name FROM department WHERE department_id = 1;

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The choice of tools used to build the TechConf project comes from my experience building Java EE applications and the collective knowledge of many colleagues, readers, speakers, and authors in the Java community. The choices presented here are not a one-size-fits-all collection of projects (although some are a must for most Java applications, like Ant) but they are what I have found to cover the current requirements and inject a level of agility that I haven t been able to achieve with a purely commercial solution. I m not advocating that you take a onesided approach and try to build everything solely on open source. In most of my professional engagements my clients have already settled on a commercial solution but are looking to open source to complement their commercial purchase. In general I find that the mix of open source projects I used in each assignment is built around: Filling a gap in a commercial solution Standardizing on a known, proven approach Avoiding vendor lock-in Improving the productivity of a team Easing the maintenance of the product

You can easily test these queries to make sure they actually work by using the Query tool, accessible Tip

As we mentioned previously, signals and slots play a crucial role in Qt, enabling any two objects to communicate with each other without the need for clumsy interface definitions or callback functions. Declaring a signal requires only that the signal s object be a QObject and that the signal be declared with the signal s keyword in the class definition. In a similar vein, Qt s classic signal/slot example is that of a counter, wired to a button and slider. Our simple Qt counter class might look like what you see in Listing 4 1.

If you want more columns to be returned, you simply list them, separated by commas. Alternatively, you can use *, which means all columns. However, for performance reasons, if you need only certain columns, you should list them separately instead of asking for them all. Using * is not advisable even if at a particular moment you do want all the columns for a query because in future you may add even more columns to the table, and your query would end up asking for more data than is needed. Finally, using * doesn t guarantee the order in which the columns are returned, as one may change the order of the columns in a table (although this is not likely to happen). For these reasons, we don t use * in this book. With your current department table, the following two statements return the same results: SELECT department_id, name, description FROM department WHERE department_id = 1; SELECT * FROM department WHERE department_id = 1;

Figure 1-6 shows a map of the projects and tools used to build TechConf and how they relate to each other and to the different tiers and functional concerns of the application.

Listing 4 1. An example declaring signals and slots #include <QObject> class Counter : public QObject { Q_OBJECT public: Counter() { mValue = 0; } int value() const { return mValue; } public slots: void setValue(int value); void increment(); signals: void valueChanged(int newValue) private: int mValue; }

If you don t want to place any condition on the query, simply remove the WHERE clause, and you ll get all the rows. The following SELECT statement returns all rows and all columns from the product table: SELECT * FROM product;

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