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// Read-only property
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One of the really nice features of Oracle is its ability to transparently handle distributed transactions. I can update data in many different databases in the scope of a single transaction. When I commit, either I commit the updates in all of the instances or I commit none of them (they will all be rolled back). I need no extra code to achieve this; I simply commit. A key to distributed transactions in Oracle is the database link. A database link is a database object that describes how to log into another instance from your instance. However, the purpose of this section is not to cover the syntax of the database link command (it is fully documented), but rather to expose you to its very existence. Once you have a database link set up, accessing remote objects is as easy as this: select * from T@another_database; This would select from the table T in the database instance defined by the database link ANOTHER_DATABASE. Typically, you would hide the fact that T is a remote table by creating a view of it, or a synonym. For example, I can issue the following and then access T as if it were a local table: create synonym T for T@another_database; Now that I have this database link set up and can read some tables, I am also able to modify them (assuming I have the appropriate privileges, of course). Performing a distributed transaction is now no different from a local transaction. All I would do is this: update local_table set x = 5; update remote_table@another_database set y = 10; commit; That s it. Oracle will commit either in both databases or in neither. It uses a two-phase commit protocol (2PC) to do this. 2PC is a distributed protocol that allows for a modification that affects many disparate databases to be committed atomically. It attempts to close the window for distributed failure as much as possible before committing. In a 2PC between many databases, one of the databases
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Figure 2-41. An OpacityMask allows you to apply various opacity levels to different parts of an object. For example, you can use an OpacityMask if you want an object to fade from opaque on one side to transparent on the other, as in a reflection. The following exercise shows you how create a reflection effect using OpacityMasks:
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Figure 4-12. Browsing through the runtime variables
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Parallelism and threading are confusing and there are a few questions many developers have (see the following questions).
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Data binding is the connection of a data source to a user interface element such as a TextBlock, TextBox, or ListBox. It is possible to do one-way data binding where data is simply displayed in the user interface, and two-way data binding where any changes a user makes within the user interface elements get reflected in the underlying data source. Data sources in Silverlight are generally objects or collections of objects with properties that can be accessed. Before we can take a closer look at data binding, we need to examine what makes it happen: the Binding markup extension. This can be used either in XAML or in the code-behind. It s not possible to bind directly to basic data types such as Int32 and string, so we need at least one containing class, such as WebDeveloper, shown here: public class WebDeveloper { public string FirstName { get; set; } public string LastName { get; set; } public string Email { get; set; } public string Website { get; set; } } This class contains several properties that will be used in the data binding. If we have a TextBlock control and want to display the FirstName property, we first bind the Text property of the TextBlock control to the FirstName property. <TextBlock x:Name="nameTextBlock" Text="{Binding FirstName}"/> This gets us halfway there. The other step is to set the DataContext property of the TextBlock control to the WebDeveloper object. This step is necessary only when it isn t possible to set the data context in XAML, and a simple object like this is one of those cases. The Binding markup extension provides support for three modes of operation: OneTime, OneWay, and TwoWay. These modes of operation control how data is bound and controls the flow between the data source and user interface elements. The following list describes each of these modes: OneTime: The data binding happens exactly once, meaning that any changes to the data source after the initial binding will not be reflected in the user interface.
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We alter the table to add a constraint on the primary key column: ops$tkyte@ORA11GR2> alter table emp add constraint emp_pk 2 primary key(empno) 3 / Table altered.
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Functions as the primary entry point to the data portal infrastructure, for use by code in business objects Implement the channel adapter pattern to abstract the underlying network protocol from the application Transfer data to and from the server, including security information, application context, the business object s data, the results of the call, and any server-side exception data Expose single points of entry for different server hosts, such as remoting, Web Services, and Enterprise Services Implements transactional and nontransactional data access behaviors, delegating all actual data access to appropriate business objects
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