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You can accept that the foreign key column can be NULL and apply additional constraints ( allowed to be NULL only if the auction end time hasn t been reached or if no bid has been made ) We always try to avoid nullable columns in a relational database schema Information that is unknown degrades the quality of the data you store Tuples represent propositions that are true; you can t assert something you don t know And, in practice, many developers and DBAs don t create the right constraint and rely on (often buggy) application code to provide data integrity An optional entity association, be it one-to-one or one-to-many, is best represented in an SQL database with a join table See figure 78 for an example schema You added a join table earlier in this chapter, for a one-to-one association.

Isolate dependencies easily with Typemock Isolator. Find testability problems with Depender. Use JMockit for Java legacy code. Use Vise while refactoring your Java code. Use FitNesse for acceptance tests before you refactor. Read Michael Feathers book on legacy code. Use NDepend to investigate your production code. Use ReSharper to navigate and refactor your production code more easily. Detect duplicate code (and bugs) with Simian. Detect threading issues with Typemock Racer.

Understanding isolation frameworks Defining fake objects Using Rhino Mocks to create stubs and mocks Surveying advanced use cases for mocks and stubs Exploring arrange-act-assert and record-and-replay syntax Avoiding common misuses of isolation frameworks

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To guarantee the multiplicity of one-to-one, you applied unique constraints on both foreign key columns of the join table In the current case, you have a one-to-many multiplicity, so only the ITEM_ID column of the ITEM_BUYER table is unique A particular item can be bought only once Let s map this in XML First, here s the boughtItems collection of the User class..

without realizing it. Out-Host is what handles getting information displayed on the screen. What other Out- cmdlets can you find

}

6.5 Summary

Cross-field validation Asynchronous validation Multiple errors per field (note: current Silverlight UI templates only support showing the first error)

So far, you ve used simple qualified property names like bid.Amount and item. Description in your HQL queries. HQL supports multipart property path expressions for two purposes:

Session session = getSessionFactory().openSession(); Transaction tx = session.beginTransaction(); User u = (User) session.get(User.class, 123); u.getDefaultBillingDetails().setOwner("John Doe"); tx.commit(); session.close();

which draws the chrome of the Web Part and then calls the RenderContents method. You shouldn t override the Render method either because that method verifies that the Web Part connections are valid and, if they aren t, the method renders an error message. If you need to overwrite any of the render methods, you should override RenderContents to start with. There are scenarios when you need to override the Render method for instance, if you have to inject code or handle errors late in the event flow. Web Part Returning to the event flow, the next Constructor called event is the OnUnload method, which you can use to do any cleanup. Finally, the DisProper es set pose method is invoked. Note that all these event methods are for OnInit the ASP.NET-based Web Part. If you create a Web Part based on the SharePoint impleTrackViewState mentation, the event flow is the same except for the rendering methods. LoadViewState All events are executed in sequence for all Ordering CreateChildControls Web Parts and controls in the order in which changed compared they re added to the zones. For example, all to normal OnLoad OnLoad methods are executed on all Web Parts ow before any calls to CreateChildControls. Postback events When you re exporting a Web Part, the export file is generated just before the Web OnPreRender Part is rendered and after the personalization state is saved by the Web Part Manager. The Closed Web Parts created Web Part Manager retrieves all properties of the Web Part and creates the XML file, which SaveViewState is returned to the client.

CacheMode.PUT Hibernate never reads items from the second-level cache,

Event id:Long name:String startDate:java.util.Date duration:int events bigint (pk) varchar (255 ) date int

Folder actions are great for any hot-folder setup you need to create. Imagine any workflow in which files need to be processed automatically but a person has to trigger the automation by telling the script which file or files to process. Although you could have created the same workflow using a script application saved as a droplet (that is, containing an open handler), folder actions give you a wider variety of action-triggering events and allow users to trigger scripts by dropping files into a folder, which may be more workflow-like than dragging and dropping files on an application droplet. Folder actions became a feature in OS 10 starting with OS X 10.2 but became reliable only in OS X 10.3 (Panther).

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