Imports System.Data.SqlClient
Imports Oracle.ManagedDataAccess.Client
Public Class ClassDatabase
    Private Const NETWORK_TIMEOUT As Integer = -1

    Private Shared SQLSERVERConnectionString As String
    Private Shared OracleConnectionString As String

    Public Shared DatabaseConnectionTimeout As Boolean = False

    Public Shared Function Init()
        Try
            SQLSERVERConnectionString = MyConnectionString
            Dim SQLconnect As New SqlConnection
            SQLconnect.ConnectionString = SQLSERVERConnectionString
            SQLconnect.Open()
            SQLconnect.Close()
            Return True
        Catch ex As Exception
            LOGGER.Info("Unexpected error in Database-Init: " & ex.Message)
            LOGGER.Error(ex)
            Return False
        End Try
    End Function

    Public Shared Function Return_Datatable(sql_command As String, Optional userInput As Boolean = False) As DataTable
        Try
            Dim SQLconnect As New SqlConnection
            Dim SQLcommand As SqlCommand
            SQLconnect.ConnectionString = SQLSERVERConnectionString
            SQLconnect.Open()
            SQLcommand = SQLconnect.CreateCommand
            SQLcommand.CommandText = sql_command
            Dim adapter1 As SqlDataAdapter = New SqlDataAdapter(SQLcommand)
            Dim dt As DataTable = New DataTable()
            adapter1.Fill(dt)
            SQLconnect.Close()

            ' Reset timeout counter when query was sucessful
            DatabaseConnectionTimeout = False

            Return dt
        Catch ex As SqlException
            Dim handled = CatchDatabaseTimeout(ex, sql_command)

            If Not handled Then
                If userInput = True Then
                    MsgBox("Error in Return_Datatable - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & sql_command, MsgBoxStyle.Critical)
                End If
                LOGGER.Error(ex)
                LOGGER.Info("#SQL: " & sql_command)
            End If

            Return Nothing
        Catch ex As Exception
            If userInput = True Then
                MsgBox("Error in Return Datatable - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & sql_command, MsgBoxStyle.Critical)
            End If
            LOGGER.Error(ex)
            LOGGER.Info("#SQL: " & sql_command)
            Return Nothing
        End Try
    End Function
    Public Shared Function Return_Datatable_CS(sql_command As String, ConString As String, Optional userInput As Boolean = False) As DataTable
        Try
            Dim SQLconnect As New SqlConnection
            Dim SQLcommand As SqlCommand
            SQLconnect.ConnectionString = ConString
            SQLconnect.Open()
            SQLcommand = SQLconnect.CreateCommand
            SQLcommand.CommandText = sql_command

            Dim adapter1 As SqlDataAdapter = New SqlDataAdapter(SQLcommand)
            Dim dt As DataTable = New DataTable()
            adapter1.Fill(dt)
            SQLconnect.Close()

            ' Reset timeout counter when query was sucessful
            DatabaseConnectionTimeout = False

            Return dt
        Catch ex As SqlException
            Dim handled = CatchDatabaseTimeout(ex, sql_command)

            If Not handled Then
                If userInput = True Then
                    MsgBox("Error in Return_Datatable_CS - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & sql_command, MsgBoxStyle.Critical)
                End If
                LOGGER.Error(ex)
                LOGGER.Info("#SQL: " & sql_command)
            End If

            Return Nothing
        Catch ex As Exception
            If userInput = True Then
                MsgBox("Error in Return_Datatable_CS - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & sql_command, MsgBoxStyle.Critical)
            End If
            LOGGER.Error(ex)
            LOGGER.Info("#SQL: " & sql_command)
            Return Nothing
        End Try
    End Function

    Public Shared Function OracleExecute_Scalar(cmdscalar As String, OracleConnection As String)
        Dim result
        Try
            Dim SQLconnect As New OracleConnection
            Dim SQLcommand As New OracleCommand
            SQLconnect.ConnectionString = OracleConnection
            SQLconnect.Open()
            SQLcommand = SQLconnect.CreateCommand
            'Update Last Created Record in Foo
            SQLcommand.CommandText = cmdscalar
            result = SQLcommand.ExecuteScalar()
            SQLcommand.Dispose()
            SQLconnect.Close()
            Return result
        Catch ex As Exception
            LOGGER.Info("Unexpected error in OracleExecute_Scalar: " & ex.Message)
            LOGGER.Error(ex)
            LOGGER.Info("#SQL: " & cmdscalar)
            Return Nothing
        End Try
    End Function
    Public Shared Function OracleExecute_non_Query(ExecuteCMD As String, OracleConnection As String, Optional userInput As Boolean = False)
        Try
            Dim SQLconnect As New OracleConnection
            Dim SQLcommand As OracleCommand
            SQLconnect.ConnectionString = OracleConnection
            SQLconnect.Open()
            SQLcommand = SQLconnect.CreateCommand
            'Update Last Created Record in Foo
            SQLcommand.CommandText = ExecuteCMD
            SQLcommand.ExecuteNonQuery()
            SQLcommand.Dispose()
            SQLconnect.Close()
            Return True
        Catch ex As Exception
            If userInput = True Then
                MsgBox("Error in OracleExecute_non_Query - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & ExecuteCMD, MsgBoxStyle.Critical)
            End If
            LOGGER.Error(ex)
            LOGGER.Info("#SQL: " & ExecuteCMD)

            Return False
        End Try
    End Function

    Public Shared Function Oracle_Return_Datatable(Select_anweisung As String, OracleConnection As String, Optional userInput As Boolean = False)
        Try
            Dim SQLconnect As New OracleConnection
            Dim SQLcommand As OracleCommand
            SQLconnect.ConnectionString = OracleConnection
            SQLconnect.Open()
            SQLcommand = SQLconnect.CreateCommand
            SQLcommand.CommandText = Select_anweisung

            Dim adapter1 As OracleDataAdapter = New OracleDataAdapter(SQLcommand)
            Dim dt As DataTable = New DataTable()
            adapter1.Fill(dt)
            SQLconnect.Close()
            Return dt
        Catch ex As Exception
            If userInput = True Then
                MsgBox("Error in Oracle Return Datatable - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & Select_anweisung, MsgBoxStyle.Critical)
            End If
            LOGGER.Error(ex)
            LOGGER.Info("#SQL: " & Select_anweisung)
            Return Nothing
        End Try
    End Function

    Public Shared Function CatchDatabaseTimeout(ex As SqlException, sql_command As String)
        Dim FatalErrors As New List(Of Integer) From {-1, -2, 121}

        If FatalErrors.Contains(ex.Number) Then
            DatabaseConnectionTimeout = True

            LOGGER.Info("Network timeout error in Return_Datatable: " & ex.Message)
            LOGGER.Info("#SQL: " & sql_command)

            Return True
        Else
            Return False
        End If
    End Function
End Class