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Listing 5-30 is an example of the first SingleOrDefault prototype where no element is found. We have to get an empty sequence to do this. I ll use the Where operator and provide a key comparison for a key that doesn t exist for this purpose.

When working with LINQ to SQL, don t forget that the database class that is generated by SQLMetal inherits from System.Data.Linq.DataContext. This means that your generated DataContext class has some useful built-in functionality, such as a TextWriter object named Log. One of the niceties of the Log object is that it will output the equivalent SQL statement of an IQueryable<T> query prior to the parameter substitution. Have you ever had code break in production that you think might be data related Wouldn t it be nice if there was a way to get the query executed against the database, so that you could enter it in SQL Server Enterprise Manager or Query Analyzer and see the exact data coming back The DataContext s Log object will output the SQL query for you. An example is shown in Listing 1-12. Listing 1-12. An Example Using the DataContext.Log Object Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out; IQueryable<Order> orders = from c in db.Customers from o in c.Orders where c.Country == "USA" && c.Region == "WA" select o; foreach(Order item in orders) Console.WriteLine("{0} - {1} - {2}", item.OrderDate, item.OrderID, item.ShipName);

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Employee emp = Employee.GetEmployeesArray() .Where(e => e.id == 5).SingleOrDefault(); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); We queried for the employee whose id is 5 since we know none exists, so an empty sequence will be returned. Unlike the Single operator, the SingleOrDefault operator handles empty sequences just fine. Here are the results: NULL Listing 5-31 is the same example where a single element is found. We use the Where operator to provide a sequence with just one element.

This code produces the following output: SELECT [t1].[OrderID], [t1].[CustomerID], [t1].[EmployeeID], [t1].[OrderDate], [t1].[RequiredDate], [t1].[ShippedDate], [t1].[ShipVia], [t1].[Freight], [t1].[ShipName], [t1].[ShipAddress], [t1].[ShipCity], [t1].[ShipRegion], [t1].[ShipPostalCode], [t1].[ShipCountry] FROM [dbo].[Customers] AS [t0], [dbo].[Orders] AS [t1] WHERE ([t0].[Country] = @p0) AND ([t0].[Region] = @p1) AND ([t1].[CustomerID] = [t0].[CustomerID]) -- @p0: Input String (Size = 3; Prec = 0; Scale = 0) [USA] -- @p1: Input String (Size = 2; Prec = 0; Scale = 0) [WA] -- Context: SqlProvider(Sql2005) Model: AttributedMetaModel Build: 3.5.20706.1 3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store 5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store 6/19/1997 12:00:00 AM - 10574 - Trail's Head Gourmet Provisioners 6/23/1997 12:00:00 AM - 10577 - Trail's Head Gourmet Provisioners 1/8/1998 12:00:00 AM - 10822 - Trail's Head Gourmet Provisioners 7/31/1996 12:00:00 AM - 10269 - White Clover Markets 11/1/1996 12:00:00 AM - 10344 - White Clover Markets 3/10/1997 12:00:00 AM - 10469 - White Clover Markets 3/24/1997 12:00:00 AM - 10483 - White Clover Markets 4/11/1997 12:00:00 AM - 10504 - White Clover Markets 7/11/1997 12:00:00 AM - 10596 - White Clover Markets 10/6/1997 12:00:00 AM - 10693 - White Clover Markets 10/8/1997 12:00:00 AM - 10696 - White Clover Markets 10/30/1997 12:00:00 AM - 10723 - White Clover Markets 11/13/1997 12:00:00 AM - 10740 - White Clover Markets 1/30/1998 12:00:00 AM - 10861 - White Clover Markets 2/24/1998 12:00:00 AM - 10904 - White Clover Markets 4/17/1998 12:00:00 AM - 11032 - White Clover Markets 5/1/1998 12:00:00 AM - 11066 - White Clover Markets

<item_tuple> <itemno>1003</itemno> <description>Old Bicycle</description> <offered_by>U02</offered_by> <start_date>1999-01-10</start_date> <end_date>1999-02-20</end_date> <reserve_price>25</reserve_price> </item_tuple> <item_tuple> <itemno>1004</itemno> <description>Tricycle</description> <offered_by>U01</offered_by> <start_date>1999-02-25</start_date> <end_date>1999-03-08</end_date> <reserve_price>15</reserve_price> </item_tuple> <item_tuple> <itemno>1005</itemno> <description>Tennis Racket</description> <offered_by>U03</offered_by> <start_date>1999-03-19</start_date> <end_date>1999-04-30</end_date> <reserve_price>20</reserve_price> </item_tuple> <item_tuple> <itemno>1006</itemno> <description>Helicopter</description> <offered_by>U03</offered_by> <start_date>1999-05-05</start_date> <end_date>1999-05-25</end_date> <reserve_price>50000</reserve_price> </item_tuple> <item_tuple> <itemno>1007</itemno> <description>Racing Bicycle</description> <offered_by>U04</offered_by> <start_date>1999-01-20</start_date> <end_date>1999-02-20</end_date> <reserve_price>200</reserve_price> </item_tuple> <item_tuple> <itemno>1008</itemno> <description>Broken Bicycle</description> <offered_by>U01</offered_by> <start_date>1999-02-05</start_date> <end_date>1999-03-06</end_date> <reserve_price>25</reserve_price>

javax.faces.component.UIInput; javax.faces.context.ExternalContext; javax.faces.context.FacesContext; javax.faces.context.ResponseWriter; javax.faces.convert.Converter; javax.faces.convert.ConverterException; javax.faces.convert.DateTimeConverter;

</item_tuple> </items>"); XDocument bids = XDocument.Parse( @"<bids> <bid_tuple> <userid>U02</userid> <itemno>1001</itemno> <bid>35</bid> <bid_date>1999-01-07</bid_date> </bid_tuple> <bid_tuple> <userid>U04</userid> <itemno>1001</itemno> <bid>40</bid> <bid_date>1999-01-08</bid_date> </bid_tuple> <bid_tuple> <userid>U02</userid> <itemno>1001</itemno> <bid>45</bid> <bid_date>1999-01-11</bid_date> </bid_tuple> <bid_tuple> <userid>U04</userid> <itemno>1001</itemno> <bid>50</bid> <bid_date>1999-01-13</bid_date> </bid_tuple> <bid_tuple> <userid>U02</userid> <itemno>1001</itemno> <bid>55</bid> <bid_date>1999-01-15</bid_date> </bid_tuple> <bid_tuple> <userid>U01</userid> <itemno>1002</itemno> <bid>400</bid> <bid_date>1999-02-14</bid_date> </bid_tuple> <bid_tuple> <userid>U02</userid> <itemno>1002</itemno> <bid>600</bid> <bid_date>1999-02-16</bid_date> </bid_tuple>

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