EDMI: Add 3-tier database access in DatabaseWithFallback, add client config,

EDMI Service: Version 2.4.0.0
EDMI: API: Version 1.4.0.0

Service.EDMIService/Methods/IDB/GetAttributeValue/GetAttributeValueMethod.vb

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+Imports DigitalData.Modules.Database
+Imports DigitalData.Modules.Logging
+Imports DigitalData.Services.EDMIService.Methods.IDB.GetAttributeValue
+
+Namespace Methods.IDB.GetAttributeValue
+    Public Class GetAttributeValueMethod
+        Inherits BaseMethod
+
+        Public Sub New(pLogConfig As LogConfig, pDatabaseIDB As MSSQLServer, pDatabaseECM As MSSQLServer, pGlobalState As GlobalState)
+            MyBase.New(pLogConfig, pDatabaseIDB, pDatabaseECM, pGlobalState)
+        End Sub
+
+        Public Function Run(pData As GetAttributeValueRequest) As GetAttributeValueResponse
+            Try
+                If Helpers.TestObjectIdExists(pData.ObjectId) = False Then
+                    LogAndThrow("ObjectId does not exist!")
+                End If
+
+                Dim oValue As Object
+                ' TODO: Implement GetAttributeValue
+
+                Return New GetAttributeValueResponse(pData.ObjectId, oValue)
+            Catch ex As Exception
+                Logger.Warn("Error occurred while getting attribute value!")
+                Return New GetAttributeValueResponse(ex)
+            End Try
+        End Function
+    End Class
+
+End Namespace