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I create the Northwind DataContext, query a customer using LINQ to SQL, and make a change to the retrieved customer s ContactName column value in the database using ADONET I have now set up a potential concurrency conflict Now, I just need to make a change to my entity object and try to persist it to the database custContactTitle = "President"; try { dbSubmitChanges(ConflictModeContinueOnConflict); } catch (ChangeConflictException) { Notice that I wrap the call to the SubmitChanges method in a try/catch block To properly detect concurrency conflicts, I catch the ChangeConflictException exception Now, I just need to call the ResolveAll method and try to persist the changes again dbChangeConflictsResolveAll(RefreshModeKeepChanges); try { dbSubmitChanges(ConflictModeContinueOnConflict); cust = dbCustomersWhere(c => cCustomerID == "LAZYK")SingleOrDefault(); ConsoleWriteLine("ContactName = {0} : ContactTitle = {1}", custContactName, custContactTitle); } catch (ChangeConflictException) { Console.

< xml version="1.0" encoding="UTF-8" > <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd" > <bean name="carDao" class="com.apress.simpleapp.dao.CatDaoImpl" /> <bean name="carService" class="com.apress.simpleapp.service.CatServiceImpl"> <property name="carDao" ref="carDao" /> </bean> </beans>

WriteLine("Conflict again, aborting"); } } In the preceding code, I call the ResolveAll method and pass a RefreshMode of KeepChanges I then call the SubmitChanges method again, which is wrapped in its own try/catch block Then, I query the customer from the database again and display the customer s ContactName and ContactTitle just to prove that neither the ADONET change nor my LINQ to SQL change were lost If that call to the SubmitChanges method throws an exception, I will just report it and abort the effort All that is left to do is to restore the database so the example can be run more than once // Reset the database ExecuteStatementInDb(String.

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The RunSpeech object also has several properties that you can access, as listed in Table 4-4.

Format( @"update Customers set ContactName = 'John Steel', ContactTitle = 'Marketing Manager' where CustomerID = 'LAZYK'")); If you look closely, disregarding the code to cause the conflict, which you wouldn t normally write, and the code to restore the database at the end of the example, which you also wouldn t normally write, resolving concurrency conflicts with this approach is pretty simple You wrap the call to the SubmitChanges method in a try/catch block, catch the ChangeConflictException exception, call the ResolveAll method, and repeat the call to the SubmitChanges method That s about all there is to it Let s look at the results of Listing 17-2 Executing SQL statement against database with ADONET .. Database updated ContactName = Samuel Arthur Sanders : ContactTitle = President Executing SQL statement against database with ADONET .. Database updated..

Constructor Injection In this strategy, the dependent object is passed as part of the constructor call, as shown in Listing 2-10.

To gain access to the Standard Query Operators, add a using System.Linq; directive to your code, if one is not already present. You do not need to add an assembly reference because the code is contained in the System.Core.dll assembly, which is automatically added to your project by Visual Studio 2008.

It is important to remember that while many of the Standard Query Operators are prototyped to return an IEnumerable<T>, and we think of IEnumerable<T> as a sequence, the operators are not actually returning the sequence at the time the operators are called. Instead, the operators return an object that when enumerated will yield an element from the sequence. It is during enumeration of the returned object that the query is actually performed and an element is yielded to the output sequence. In this way, the query is deferred. In case you are unaware, when I use the term yield, I am referring to the C# 2.0 yield keyword that was added to the C# language to make writing enumerators easier. For example, examine the code in Listing 3-2. Listing 3-2. A Trivial Sample Query string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; IEnumerable<string> items = presidents.Where(p => p.StartsWith("A")); foreach(string item in items) Console.WriteLine(item); The query using the Where operator is not actually performed when the line containing the query is executed. Instead, an object is returned. It is during the enumeration of the returned object that the Where query is actually performed. This means it is possible that an error that occurs in the query itself may not get detected until the time the enumeration takes place.

Returns the most recent active QA object Returns exceptions of a QA object Used to set the method that should be called when the user hangs up

public class CarServiceImpl implements CarService{ private CarDao carDao; public void CarServiceImpl (CarDao carDao){ this.carDao = carDao; } public void refuel(Car car){ carDao.updateFuelConsumed(car) ; } }

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