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However, a couple of things need to be done to get this type of two-way binding to work One problem is that, currently, the Book class does not support notifying bound clients of changes to its properties In other words, when a property changes in Book, the class will not notify the TextBox instances that are bound to the class of the change You could take care of this by creating a change event for each property This is far from ideal; fortunately, there is an interface that a class can implement that handles this for you This interface is known as INotifyPropertyChanged Let s use it..

If one (or both) of the tables has rows with a Null in the field involved in the join condition, then that row will not appear in the result of an inner join. If that row is required, you can use an outer join. A left outer join will include all rows in the left table, including those with a Null in the join field the corresponding fields from the right table will contain Nulls. A right outer join is the same but includes all rows from the right table, and a full outer join includes all rows from both tables.

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The Spring framework includes implementations that can be configured from XML files found directly on the file system or from network resources, that can be loaded from classpath-relative paths, and that can be configured programmatically. It also provides several web application specific implementations and several abstract partial implementations used by these. You will not normally need to create your own application context implementation, but an ApplicationContext implementation (rather than other morelimited BeanFactory implementations) is the usual starting point for creating a Spring application.

Modify the Book class definition to inherit from INotifyPropertyChanged. Notice that when you inherit from INotifyPropertyChanged, you need to add using System.ComponentModel. Luckily, Visual Studio will help you with this, as shown in Figure 5-3.

n the previous chapters, we looked at the select and project operations, which retrieve a subset of rows and columns from a single table, and we also looked at Cartesian products and joins, which combine two tables on a common field. We saw that there are several different ways to write SQL statements to perform combinations of these operations. As queries become more complicated, we might find that we can think of SQL expressions for different parts of the query but we need a way to tie them all together. In this chapter, we will look at nested queries and two new SQL keywords, EXISTS and IN. We will see how to use nesting to perform some of the queries we have already done and also how this will open up some other possibilities.

The WebApplicationContext does not expand dramatically on the contract offered by the ApplicationContext interface, but in a web application you will often have a 1:1 relationship between WebApplicationContext instances and the servlet that is servicing a particular web request. The hierarchical capabilities of the web application context (inherited via ApplicationContext from HierarchicalBeanFactory) are used to good effect here to give the individual WebApplicationContext instances access to the parent ApplicationContext instance associated with the application as a whole, but not with any of their siblings. This approach makes the configuration information more modular with cleaner separation of concerns. You will see the application of this in 6, where a DispatcherServlet implementation initializes a WebApplicationContext instance and forwards all its incoming web requests to beans defined in the WebApplicationContext s configuration file. These beans in turn are injected with dependencies obtained from the parent ApplicationContext.

Figure 5-3. Visual Studio assists when you need to add the System.ComponentModel namespace. Next, you can let Visual Studio do some more work for you. After adding the using System.ComponentModel statement, right-click INotifyPropertyChanged and select Implement Interface Implement Interface from the pop-up menu, as shown in Figure 5-4.

The IN keyword allows us to select rows from a table, where an attribute can have one of several values. For example, if we wanted to retrieve the member IDs from the rows in our Entry table for tournaments with ID 36, 38, or 40, we could do this with a Boolean OR operator, as in the SQL statement in Listing 4-1.

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