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def Start(self):
        if (self.conn == None) or (self.conn.State == 1):
            self.conn = win32com.client.Dispatch(r'ADODB.Connection')
            self.conn.Open(self.DSN) #JD:here will occupy 2MB mem
           
        if (self.rst == None) or (self.rst.State == 1):
            self.rst = win32com.client.Dispatch(r'ADODB.Recordset')   
            self.rst.Open('[' + self.strTableName + ']', self.conn, 1, 3) #JD:here will occupy <1MB mem