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Obviously, you were able to reduce this method because some of the work is now delegated to the domain model (item.PlaceBid). But this code still contains functionality that is relevant to both the persistence layer and the business layer; it s dealing with both saving and loading entities, and deciding how to construct queries to coordinate the placing of a bid. To take things a step further, let s attempt to clearly separate these responsibilities. Remember, as your programs get bigger, combining lots of responsibilities into a single class can lead to software that is difficult to maintain and evolve. Separating responsibilities will make life much easier for you. Many patterns are available to help you address this separation of concerns. Let s examine one of the most popular.

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How to read QR code in windows phone 8.1 app development? - Stack ...
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Edit the ReportingServicesService.exe.config file using any XML editor and change the value for the configuration setting DefaultTraceSwitch. Valid integer values are 0 to disable tracing or 1 through 4 to enable tracing with successively greater detail. Create an execution logging database in Microsoft SQL Server Management Studio, and then run the createtables.sql script. Execute the SQL Server 2005 Integration Services (SSIS) package RSExecutionLog_Update.dtsx and schedule for periodic execution to keep the execution logging database relatively current. Use the Report Designer in Visual Studio to create your own reports or deploy the sample reports in the ExecutionLog solution in the C:\Documents and Settings\<username>\My Doucments\Microsoft Press\rs2005sbs \chap11\ExecutionLog folder. In Visual Studio, click the Data tab of a report, click the dataset containing the source query in the Dataset drop-down list, and then click Edit Selected Dataset. Enter the time-out value in seconds in the Timeout box. For a global time-out, click the Site Settings link in Report Manager. Select Limit Report Execution To The Following Number Of Seconds and enter a time-out value in seconds. or For a report time-out, open the report, click the Properties tab, and then click the Execution link. Select Limit Report Execution To The Following Number Of Seconds and enter a time-out value in seconds.

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Mixing data access code (the responsibility of the persistence layer) with control logic (part of the business layer) violates our emphasis on separation of concerns. For all but the simplest applications, it makes sense to hide NHibernate API calls behind a fa ade with higher-level business semantics. There is more than one way to design

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this fa ade some small applications may use a single class for all persistence operations; some may use a class for each operation but we prefer the Data Access Object (DAO) pattern. A DAO defines an interface to persistence operations (CRUD and finder methods) relating to a particular persistent entity. It advises you to group code that relates to persistence of that entity. Another common name for this pattern is Gateway (although they have slightly different meanings). If you ve read Domain-Driven Design [Evans 2004], you may realize that the DAO pattern is similar to the Repository pattern described there. DAO tends to be slightly more fine-grained, having one DAO class per entity. We like both these patterns, but for this example it s simpler to explain DAO rather than the ins and outs of domain-driven development (DDD). To begin our explanation of the DAO pattern, let s create an ItemDAO class, which will eventually implement all persistence code related to Items. For now, it contains only the FindById() method, along with GetMaxBidAmount() and a method to save items. The full code of the DAO implementation is shown in listing 10.3.

public class ItemDAO { public static Item FindById(long id) { using (ISession session = NHibernateHelper.OpenSession()) return session.Load<Item>(id); } public static double GetMaxBidAmount(long itemId) { string query = @"select max(b.Amount) from Bid b where b.Item = :item"; using (ISession session = NHibernateHelper.OpenSession()) { IQuery q = session.CreateQuery(query); q.SetInt64("itemId", itemId); return (double) q.UniqueResult(); } } public static Item MakePersistent(Item entity) { using (ISession session = NHibernateHelper.OpenSession()) session.SaveOrUpdate(entity); return entity; } }

Create an execution logging database Load the execution logging database with current data Analyze data in the execution logging database

This class provides two static methods to perform the operations needed by your PlaceBid() method. The FindById() method B loads items. Note that pessimistic locking isn t an option here because you re opening and closing sessions in several places, and you may want the lock to span all these operations (something we haven t allowed for here, but we ll get to that). To retrieve the highest bid amount, you can use the GetMaxBidAmount() method C. The MakePersistent() method D can be used to save items. Whether GetMaxBidAmount() belongs on an ItemDAO or a BidDAO is a matter of taste; but because the argument is an Item identifier, it seems to naturally belong

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