86 lines
3.0 KiB
VB.net
86 lines
3.0 KiB
VB.net
Imports DigitalData.Modules.Database
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Imports DigitalData.Modules.EDMI.API
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Imports DigitalData.Modules.EDMI.API.Constants
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Imports DigitalData.Modules.EDMI.API.EDMIServiceReference
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Imports DigitalData.Modules.Logging
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Imports DigitalData.Modules.Language.Utils
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Public Class DatabaseWithFallback
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Private ReadOnly _Logger As Logger
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Private ReadOnly _Client As Client
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Private ReadOnly _DatabaseEDM As MSSQLServer
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Private ReadOnly _DatabaseIDB As MSSQLServer
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Public Enum TableType
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TBIDB_ATTRIBUTE
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End Enum
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Public Class Table
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Public TableName As String
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Public SQLCommand As String
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Public DatabaseType As Constants.DatabaseType
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End Class
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Public Property Tables As New List(Of Table) From {
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New Table With {.DatabaseType = DatabaseType.IDB, .TableName = "TBIDB_ATTRIBUTE", .SQLCommand = "SELECT * FROM TBIDB_ATTRIBUTE"}
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}
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Public Sub New(LogConfig As LogConfig, Client As Client, DatabaseECM As MSSQLServer, DatabaseIDB As MSSQLServer)
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_Logger = LogConfig.GetLogger()
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_Client = Client
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_DatabaseEDM = DatabaseECM
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_DatabaseIDB = DatabaseIDB
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End Sub
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Public Function GetDatatable(pDataTableName As String, pFallbackSQL As String, pFallbackType As Constants.DatabaseType, Optional pFilterExpression As String = "", Optional pSortByColumn As String = "", Optional pForceFallback As Boolean = False) As DataTable
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Try
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Dim oResult As DataTable = Nothing
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If pForceFallback = False Then
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Dim oTableResult As TableResult
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Try
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oTableResult = _Client.GetDatatableByName(pDataTableName, pFilterExpression, pSortByColumn)
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Catch ex As Exception
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_Logger.Error(ex)
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oTableResult = Nothing
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End Try
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If oTableResult Is Nothing OrElse oTableResult.OK = False Then
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_Logger.Warn("Datatable [{0}] could not be fetched from AppServer Cache. Falling back to direct Database Access.", pDataTableName)
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Return GetDatatableFromDatabase(pFallbackSQL, pFallbackType)
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End If
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Return oTableResult.Table
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Else
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Return GetDatatableFromDatabase(pFallbackSQL, pFallbackType)
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End If
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Catch ex As Exception
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_Logger.Error(ex)
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Return Nothing
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End Try
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End Function
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Private Function GetDatatableFromDatabase(SQLCommand As String, DatabaseType As DatabaseType)
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Try
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Select Case DatabaseType
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Case DatabaseType.ECM
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Return _DatabaseEDM.GetDatatable(SQLCommand)
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Case DatabaseType.IDB
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Return _DatabaseIDB.GetDatatable(SQLCommand)
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Case Else
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Return Nothing
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End Select
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Catch ex As Exception
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_Logger.Error(ex)
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Return Nothing
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End Try
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End Function
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End Class
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