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The ANSI/ISO SQL standard defines four levels of transaction isolation, with different possible outcomes for the same transaction scenario. That is, the same work performed in the same fashion with the same inputs may result in different answers, depending on your isolation level. These isolation levels are defined in terms of three phenomena that are either permitted or not at a given isolation level: Dirty read: The meaning of this term is as bad as it sounds. You are permitted to read uncommitted, or dirty, data. You would achieve this effect by just opening an OS file that someone else is writing and reading whatever data happens to be there. Data integrity is compromised, foreign keys are violated, and unique constraints are ignored. Nonrepeatable read: This simply means that if you read a row at time T1 and attempt to reread that row at time T2, the row may have changed. It may have disappeared, it may have been updated, and so on.

Chief among the behaviors is the GetMethod() method. This method is used to locate a specific method on the business class or object. Once the method has been located, other code can retrieve the attributes for that method, or the method can be invoked. This method is somewhat complex. Recall that the data portal will call strongly typed methods based on the type of criteria object provided by the business object s factory method. This means that GetMethod() must locate the matching method on the business class not only by method name, but by checking the parameter types as well. The process flow is illustrated in Figure 4-8.

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Phantom read: This means that if you execute a query at time T1 and re-execute it at time T2, additional rows may have been added to the database, which will affect your results. This differs from the nonrepeatable read in that with a phantom read, data you already read has not been changed, but rather that more data satisfies your query criteria than before.

namespace SocketTcpServerSample { public class Program { private const int port = 2000; public static void Main() { using (Socket listeningSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)) { listeningSocket.Bind(new IPEndPoint(IPAddress.Any, port)); Debug.Print("Listening for a client..."); listeningSocket.Listen(1); using (Socket communicationSocket = listeningSocket.Accept()) { Debug.Print("Connected to client."); //wait infinitely to get a response if (communicationSocket.Poll(-1, //timeout in microseconds SelectMode.SelectRead)) { byte[] inBuffer = new byte[communicationSocket.Available]; int count = communicationSocket.Receive(inBuffer); string message = new string(Encoding.UTF8.GetChars(inBuffer)); Debug.Print("Received '" + message + "'.");

Figure 4-8. Process flow implemented by GetMethod()

Note The ANSI/ISO SQL standard defines transaction-level characteristics, not just individual statementby-statement level characteristics. In the following pages, we ll examine transaction-level isolation, not just statement-level isolation.

The SQL isolation levels are defined based on whether or not they allow each of the preceding phenomena. I find it interesting to note that the SQL standard does not impose a specific locking scheme or mandate particular behaviors, but rather describes these isolation levels in terms of these phenomena, allowing for many different locking/concurrency mechanisms to exist (see Table 7-1). Table 7-1. ANSI Isolation Levels

Here s the method in its entirety: Public Function GetMethod(ByVal objectType As Type, _ ByVal method As String, ByVal ParamArray parameters() As Object) _ As MethodInfo Dim flags As BindingFlags = _ BindingFlags.FlattenHierarchy Or _ BindingFlags.Instance Or _ BindingFlags.Public Or _ BindingFlags.NonPublic Dim result As MethodInfo = Nothing ' try to find a strongly typed match If parameters.Length > 0 Then ' put all param types into an array of Type Dim paramsAllNothing As Boolean = True Dim types As New List(Of Type) For Each item As Object In parameters If item Is Nothing Then types.Add(GetType(Object))

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