XSqlQuery query; query.prepare("SELECT * FROM customers WHERE age > :age"); query.bindValue(":age", 18); query.exec();
XSqlQuery query("SELECT * FROM products"); if (query.exec()) { int size = query.size(); qDebug() << "Number of products:" << size; }This code executes a SQL query to select all products and checks if the query was successful using `exec()`. Then, it retrieves the number of rows in the result set using `size()` method of the XSqlQuery class and prints it out using qDebug(). Overall, XSqlQuery is a useful class for working with databases in C++ and can be used in conjunction with other classes in the QSql module for tasks such as inserting data, updating data, and managing transactions.