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CHAPTER 9: Virtualization
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applications built and deployed onto its platform, while still encouraging developer creativity as much as possible. To facilitate this dual goal of being autocratic and democratic at the same time, Microsoft has created a Windows Phone Marketplace. Windows Phone Marketplace is the single online distribution point for all Windows Phone 7 applications. The objectives of Windows Phone 7 Marketplace and the way it achieves those objectives are described in the following sections.
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Figure 12-6. Handling multiple result sets
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For this test case, we ll call the investigation whereswaldo. At the new screen, enter whereswaldo and any pertinent description of the case (see Figure 19 6).
Atomicity: A transaction is atomic if it s regarded as a single action rather than a collection of separate operations. So, only when all the separate operations succeed does a transaction succeed and is committed to the database. On the other hand, if a single operation fails during the transaction, everything is considered to have failed and must be undone (rolled back) if it has already taken place. In the case of the order-entry system of the Northwind database, when you enter an order into the Orders and Order Details tables, data will be saved together in both tables, or it won t be saved at all. Consistency: The transaction should leave the database in a consistent state whether or not it completed successfully. The data modified by the transaction must comply with all the constraints placed on the columns in order to maintain data integrity. In the case of Northwind, you can t have rows in the Order Details table without a corresponding row in the Orders table, as this would leave the data in an inconsistent state. Isolation: Every transaction has a well-defined boundary that is, it is isolated from another transaction. One transaction shouldn t affect other transactions running at the same time. Data modifications made by one transaction must be isolated from the data modifications made by all other transactions. A transaction sees data in the state it was in before another concurrent transaction modified it, or it sees the data after the second transaction has completed, but it doesn t see an intermediate state. Durability: Data modifications that occur within a successful transaction are kept permanently within the system regardless of what else occurs. Transaction logs are maintained so that should a failure occur the database can be restored to its original state before the failure. As each transaction is completed, a row is entered in the database transaction log. If you have a major system failure that requires the database to be restored from a backup, you could then use this transaction log to insert (roll forward) any successful transactions that have taken place. Every database server that offers support for transactions enforces these four ACID properties automatically.
<Column(Id:=True)> _ Public customerId As String <Column()> _ Public companyName As String <Column()> _ Public city As String <Column()> _ Public country As String End Class Sub Main(ByVal args As String()) ' Connection string Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" ' Create data context Dim db As DataContext = New DataContext(connString) ' Create typed table Dim customers As Table(Of Customers) = db.GetTable(Of Customers)() ' Create dataset Dim ds As DataSet = New DataSet() ' Load typed table into dataset ds.Tables.Add(customers.ToDataTable()) ' Query data table Dim custs = _ From c In ds.Tables(0).ToQueryable() _ Select _ cid := c.Field(Of String)("customerid"), _ co := c.Field(Of String)("companyname") ObjectDumper.Write(custs) End Sub End Module
installer. This contains an older installation program that many consider more reliable on some problematic computers.
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As well as storing XML data, you can also execute XQuery operations and special XML datamanipulation statements on the data. The XML data can have an XSD schema attached to it so that data validations can be performed. You can also index tables on the basis of an XML column.
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