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If LINQ to SQL were limited to mapping data between relational data and objects, it would represent yet another in a long line of object-relational mapping solutions. As we ve already seen, LINQ offers the capability to construct strongly typed queries directly within the language. Beyond that, the framework includes support to manage object changes and to optimize the database interaction based on those values. The DataContext object continues to play a pivotal role in the entity s life cycle. As we ve already seen, the DataContext manages the connection to the database. In addition, it evaluates the mappings and translates the expression trees into consumable structures. If we were only concerned with viewing data, the mapping and translation services would be sufficient for our needs. The life cycle would end the moment we fetched the objects. As applications work with the results of queries, they typically view the data and make changes. We need a mechanism for tracking the changes that are made and maintaining those values until they are no longer needed. Additionally, we need to retain the changes so that we can commit them to the database. To handle the rest of the object s life cycle, the DataContext also manages references to the retrieved objects. It watches as changes are made to them by tracking the retrieved object s identities and the changed values. Figure 7.4 illustrates the services offered by the DataContext. The life cycle begins when we first read a value from the database. Prior to passing the resulting object on to the consuming application code, the DataContext retains a reference to the object. An identity management service tracks the

' ----- Return a description of this editor. Public MustOverride Function GetEditDescription( ) As String ' ----- Return the title-bar text for this editor. Public MustOverride Function GetEditTitle( ) As String

To recap, validating the I/O system with SQLIOSIM before production implementation and ensuring page checksums are enabled are crucial steps in avoiding a scenario in which a large amount of data is corrupted before being discovered. SQLIOSIM will

document.addContent( new ProcessingInstruction("xml-stylesheet", "href=\"watchlist.wml.en_GB.xsl\" type=\"text/xsl\" media=\"wap\"")); } return document.toString(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }

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One of the first things you need to know to use the ModelSpace and PaperSpace collections is which space model or paper is currently active. This information is held in the ActiveSpace property of the Document object. This is an integer property, and it may hold one of the two values shown in Table 8-1, along with that value s associated AutoCAD constants. Table 8-1. ModelSpace and PaperSpace Constants

$text_width = $im->[$#$im]->Get('width'); $text_height = $im->[$#$im]->Get('height'); } else { warn $rc; } # Get rid of the temporary image pop @$im;

Console.WriteLine("After Submit Changes:"); ObjectDumper.Write(context1.Subjects.Where(s => s.ID == Id)); ObjectDumper.Write(context2.Subjects.Where(s => s.ID == Id)); LinqBooksDataContext context3 = new LinqBooksDataContext(); ObjectDumper.Write(context3.Subjects.Where(s => s.ID == Id));

desc = [NSString stringWithFormat: @"%@, a %d %@ %@, has %d doors, %.1f miles, and %d tires.", name, modelYear, make, model, numberOfDoors, mileage, [tires count]]; return desc; } // description

This chapter will see the following security-focused features added to the Library Project: The login form, which authenticates librarians and other administrative users Security group and user management forms A function that encrypts a user-supplied password Activation of some application features that depend on user authentication

The ValidateFormData method does some simple checks for valid data, such as requiring that the user enter the security group name, and that it is unique. If everything looks good, the SaveFormData routine builds SQL statements that save the data.

When I tested Sylvain s code on my data, the performance was not good. But he had selected the weights in his function to fit English, and my data was based on Slovenian. To address this, I created this table:

package jfxia.chapter11.jfx; import import import import import import import import import javafx.ext.swing.SwingComponent; javafx.ext.swing.SwingHorizontalAlignment; javafx.ext.swing.SwingLabel; javafx.ext.swing.SwingVerticalAlignment; javafx.scene.CustomNode; javafx.scene.Node; javafx.scene.paint.Color; javafx.scene.text.Font; javafx.scene.text.FontWeight;

Script 16-2 shows an ultracool script in regard to utilizing PDF data in the clipboard. It takes a selection you make with the marquee tool (Tools Select Tool) in a PDF document within the application Preview and saves it to a file you specify.

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