Database.Cached: Add Database Cached Module

Database.Cached/MSSQLServerCached.vb

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+Imports DigitalData.Modules.Database
+Imports DigitalData.Modules.EDMI.API
+Imports DigitalData.Modules.EDMI.API.EDMIServiceReference
+Imports DigitalData.Modules.Logging
+
+Public Class MSSQLServerCached
+    Private _Logger As Logger
+    Private _Client As Client
+    Private _DatabaseEDM As MSSQLServer
+    Private _DatabaseIDB As MSSQLServer
+    Private _Type As DatabaseType
+
+    Public Enum DatabaseType
+        ECM
+        IDB
+    End Enum
+
+    Public Sub New(LogConfig As LogConfig, Client As Client, DatabaseECM As MSSQLServer, DatabaseIDB As MSSQLServer)
+        _Logger = LogConfig.GetLogger()
+        _Client = Client
+        _DatabaseEDM = DatabaseECM
+        _DatabaseIDB = DatabaseIDB
+    End Sub
+
+    Public Function GetDatatable(DataTable As String, FilterExpression As String, SortByColumn As String, FallbackSQL As String, FallbackType As DatabaseType, Optional ForceFallback As Boolean = False) As DataTable
+        Try
+            Dim oResult As DataTable = Nothing
+
+            If ForceFallback = False Then
+                Dim oTableResult As TableResult = _Client.GetDatatableByName(DataTable, FilterExpression, SortByColumn)
+
+                If oTableResult Is Nothing OrElse oTableResult.OK = False Then
+                    _Logger.Warn("Datatable [{0}] could not be fetched from AppServer Cache. Falling back to direct Database Access.")
+                End If
+            Else
+                Return GetDatatableFromDatabase(FallbackSQL, FallbackType)
+            End If
+        Catch ex As Exception
+            _Logger.Error(ex)
+            Return Nothing
+        End Try
+    End Function
+
+    Private Function GetDatatableFromDatabase(SQLCommand As String, DatabaseType As DatabaseType)
+        Try
+            Select Case DatabaseType
+                Case DatabaseType.ECM
+                    Return _DatabaseEDM.GetDatatable(SQLCommand)
+
+                Case DatabaseType.IDB
+                    Return _DatabaseIDB.GetDatatable(SQLCommand)
+
+                Case Else
+                    Return Nothing
+
+            End Select
+        Catch ex As Exception
+            _Logger.Error(ex)
+            Return Nothing
+
+        End Try
+    End Function
+End Class