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Next, we have a more complicated scenario that gives the user multiple ways to view data and the ability to specify the order in which the results are returned. The first way to view the data mimics the data from Scenario 2. The second option returns all the data from Scenario 2 along with the total amount of money each customer has spent on products in the last six months. Acquiring the sales totals for customers requires joining the Customers, Orders, and Order Details tables, adding aggregate columns to the select fields list, and additional WHERE clause items to limit the orders to those in the last six months. Listing 8-14 and 8-15 show the SQL and SqlQuery representations of this scenario s query.

Note You can extend the SqlQuery tool to programmatically create joins between tables if you want to.

Best Practice Avoid logging unnecessary information. This will convolute the logging trace and make it

Listing 8-14. Scenario #3 SQL Representation SELECT CustomerID, CompanyName, City, Phone AS PhoneNumber, Fax as FaxNumber FROM Customers WHERE City='<City Name>' -- line is optional ORDER BY <Sort Order Field List> -- line is optional SQL Representation (Option 2): SELECT Customers.CustomerID, Customers.CompanyName, Customers.Phone AS PhoneNumber, Customers.Fax AS FaxNumber, Customers.City, SUM([Order Details].UnitPrice * [Order Details].Quantity) AS TotalSpent FROM Customers INNER JOIN Orders ON Customers.CustomerID = Orders.CustomerID INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID WHERE (Orders.OrderDate > '<Six Months Ago>') AND (Customers.City = '<City Name>') -- line is optional GROUP BY Customers.CustomerID, Customers.CompanyName, Customers.Phone, Customers.Fax, Customers.City ORDER BY <Sort Order Field List> -- line is optional Listing 8-15. Scenario #3 SqlQuery Representation '*************************************************************************** Public Shared Function Scenario3(ByVal CityName As String, _ ByVal ShowTotalSpent As Boolean, ByVal SortColumn As String, _ ByVal SortDir As Reporting.SqlSortDirection) As String Dim SqlQueryObj As New Reporting.SqlQuery SqlQueryObj.SelectFields.Add("Customers.CustomerID") SqlQueryObj.SelectFields.Add("Customers.CompanyName")

To test the game in the emulator, create a launch configuration within your Eclipse IDE, as follows: 1. 2. 3. 4. From the main menu, select Run Run Configurations. Enter a name for the configuration (Doom) and select the project ch07.Android.Doom. Set the Launch Action as Launch Default Activity. Figure 7-4 shows the completed Run Configurations dialog box for this example. Click Run.

SqlQueryObj.SelectFields.Add("City") SqlQueryObj.SelectFields.Add("Customers.Phone", "PhoneNumber") SqlQueryObj.SelectFields.Add("Customers.Fax", "FaxNumber") If Not CityName = String.Empty Then SqlQueryObj.Where.AddCondition("Customers.City='" & CityName & "'") End If If ShowTotalSpent Then 'Set up the additional Select Field SqlQueryObj.SelectFields.Add( _ "SUM([Order Details].UnitPrice * [Order Details].Quantity)", _ "TotalSpent") 'Set up the FROM clause with the Joined tables SqlQueryObj.From = "Customers INNER JOIN Orders ON " & _ "Customers.CustomerID = Orders.CustomerID INNER JOIN " & _ "[Order Details] ON Orders.OrderID = [Order Details].OrderID" 'Add the WHERE clause to limit orders to the last 6 months SqlQueryObj.Where.And() SqlQueryObj.Where.AddCondition("Orders.OrderDate > '" & _ Format(CDate(Now.AddMonths(-6)), "MM/dd/yyyy") & "'") 'Set up the GROUP BY clause SqlQueryObj.GroupBy.Add("Customers.CustomerID") SqlQueryObj.GroupBy.Add("Customers.CompanyName") SqlQueryObj.GroupBy.Add("Customers.Phone") SqlQueryObj.GroupBy.Add("Customers.Fax") SqlQueryObj.GroupBy.Add("Customers.City") Else 'Set up the single table FROM clause SqlQueryObj.From = "Customers" End If 'Build out ORDER BY based on SortColumn value Select Case UCase(SortColumn) Case "CUSTOMERID" SqlQueryObj.OrderBy.Add("CustomerID", SortDir) Case "TOTALSPENT" SqlQueryObj.OrderBy.Add("TotalSpent", SortDir) SqlQueryObj.OrderBy.Add("CompanyName", SortDir) Case Else SqlQueryObj.OrderBy.Add("CompanyName", SortDir) End Select

Return SqlQueryObjGetQuery() End Function As you can see, the SqlQuery class allows you to focus more on building queries and less on string manipulation Scenario3 begins by adding the common fields to both queries to SqlQueryObj Notice that the SELECT field names are fully qualified; that is, they contain both the table and the column name in their definition It always helps to fully qualify fields because SQL Server does not have to do any extra work to determine which table the field belongs to And you are required to fully qualify field names that appear in more than one of the tables you are joining because SQL has no way of resolving the name otherwise Both queries use the CityName filter in the WHERE clause if it s specified, so Scenario3 runs the conditional logic to determine if the clause should be added.

Redundant and unnecessary logging information affects an application s performance and usefulness. Even if we use a level that is turned off in the deployed application, the logger framework will have to do the extra work of checking the levels for each logging message. This level checking for logging requests with redundant and unnecessary information will affect the performance of the overall logging. So it is best to avoid having such logging requests within an application.