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Listing 5 12. Formatting an earthquake report with position information and the back button void MainController::handleItemClicked(const QModelIndex& which) { QPair<qreal, qreal> where(mSortedModel->data(which, QuakeListModel::Latitude).value<qreal>(), mSortedModel->data(which, QuakeListModel::Longitude).value<qreal>()); QString distance = QString(tr("unknown")); QVariant desc = mSortedModel->data(which, QuakeListModel::Description); QVariant title = mSortedModel->data(which, QuakeListModel::DisplayRole); if (mLocationKnown) { distance = QString("%1 km (%2 mi)") .arg((qreal)gcdDistance(where, mLocation)) .arg((qreal)gcdDistance(where, mLocation) / kKmPerMile); } QString html = QString(tr("%1<h1>%2</h1>\n%3\n<strong>Distance</strong>:%4\n%5")) .arg(kInitScript) .arg(title.value<QString>()) .arg(desc.value<QString>()) .arg(distance) .arg(kExitItem); mItemWidget->setHtml(html); mMainWidget->setCurrentIndex(kItemWidget); }

array_upper(inQuantities, 1) LOOP IF inQuantities[i] > 0 THEN UPDATE shopping_cart SET quantity = inQuantities[i], added_on = NOW() WHERE cart_id = inCartId AND product_id = inProductIds[i]; ELSE PERFORM shopping_cart_remove_product(inCartId, inProductIds[i]); END IF; END LOOP; END; $$; The shopping_cart_update function is used when you want to update the quantity of one or more existing shopping cart items This function is called when the visitor clicks the Update button shopping_cart_update receives as parameters two array values: inProductIds and inQuantities The value of inQuantities[i] represents the new quantity for the product specified by inProductIDs[i] If inQuantities[i] is zero or less, shopping_cart_update removes the mentioned product from the shopping cart Otherwise, it updates the quantity of the product in the shopping cart and also updates added_on to accurately reflect the time the record was last modified.

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TestNG also provides a mechanism for declaring dependencies amongst test methods and avoiding being overwhelmed by what Beust refers to as the failure cascade trauma in JUnit when it reports all the failures of dependent tests as well as the root failure. The Test annotation can take a parameter of dependsOnMethods, which takes a comma-separated list of methods. Similarly, you can declare method dependencies on a group via the dependsOnGroups parameter, which takes a comma-separated list of groups. TestNG will guarantee that all of the methods in a dependent group are executed before the method.

Updating the added_on field is particularly useful for the administration page, when you ll want to remove shopping carts that haven t been updated in a long time 5 Use the query tool to execute this code, which creates the shopping_cart_remove_product function in your hatshop database: -- Create shopping_cart_remove_product function CREATE FUNCTION shopping_cart_remove_product(CHAR(32), INTEGER).

This method has changed a lot, because we now no longer only show the bit of HTML provided by the USGS, but a title with the same information as in the list view, a distance (if we can compute one), and the back button. This method starts by extracting the position of the earthquake event from the item in the model, as well as its description and title. If the location is known, a string containing the distance in kilometers and miles is computed using the Law of Haversines (http://en.wikipedia.org/wiki/Great-circle_distance), although we could have just

RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; inProductId ALIAS FOR $2; BEGIN DELETE FROM shopping_cart WHERE cart_id = inCartId AND product_id = inProductId; END; $$; The shopping_cart_remove_product function removes a product from the shopping cart when a visitor clicks the Remove button for one of the products in the shopping cart. 6. Use the query tool to execute this code, which creates the cart_product type and shopping_cart_ get_products functions in your hatshop database: -- Create cart_product type CREATE TYPE cart_product AS ( product_id INTEGER, name VARCHAR(50), price NUMERIC(10, 2), quantity INTEGER, subtotal NUMERIC(10, 2) ); -- Create shopping_cart_get_products function CREATE FUNCTION shopping_cart_get_products(CHAR(32)) RETURNS SETOF cart_product LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; outCartProductRow cart_product; BEGIN FOR outCartProductRow IN SELECT p.product_id, p.name, COALESCE(NULLIF(p.discounted_price, 0), p.price) AS price, sc.quantity, COALESCE(NULLIF(p.discounted_price, 0), p.price) * sc.quantity AS subtotal FROM shopping_cart sc INNER JOIN product p ON sc.product_id = p.product_id WHERE sc.cart_id = inCartId AND buy_now LOOP RETURN NEXT outCartProductRow; END LOOP; END; $$;

TestNG allows test parameters to be passed from the testng.xml file or via the Parameters and DataProvider annotations. The org.testng.annotations.Parameters annotation applies to the org.testng.annotations.Test and org.testng.annotations.Configuration parameters. For example, if you wanted to have a set of database-specific tests, you could define the database parameters in the textng.xml file as shown in Listing 8-11. Listing 8-11. TestNG Parameterized Configuration <!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" > <suite name="Test Suite" <parameter name="url" value="jdbc:mysql://localhost/test" /> <parameter name="driver" value="com.mysql.jdbc.Driver" /> <parameter name="username" value="user" /> <parameter name="password" value="pass" /> <test name="DBTest"> ... </test> </suite> To use the parameters in your test code simply use the parameters annotation as shown in Listing 8-12. Listing 8-12. Using TestNG Parameters in Code Connection connection = null; @Parameters({ "url", "driver", "username", "password" }) @Configuration(beforeTestClass = true) private void initializeDB(String url, String driver, String username, String password) {

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