class/Npgsql/Npgsql/NpgsqlQuery.cs

   1 // Npgsql.NpgsqlQuery.cs
   2 //
   3 // Author:
   4 //      Dave Joyner <d4ljoyn@yahoo.com>
   5 //
   6 //      Copyright (C) 2002 The Npgsql Development Team
   7 //      npgsql-general@gborg.postgresql.org
   8 //      http://gborg.postgresql.org/project/npgsql/projdisplay.php
   9 //
  10 // This library is free software; you can redistribute it and/or
  11 // modify it under the terms of the GNU Lesser General Public
  12 // License as published by the Free Software Foundation; either
  13 // version 2.1 of the License, or (at your option) any later version.
  14 //
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 // Lesser General Public License for more details.
  19 //
  20 // You should have received a copy of the GNU Lesser General Public
  21 // License along with this library; if not, write to the Free Software
  22 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23
  24
  25 using System;
  26 using System.IO;
  27 using System.Text;
  28 using System.Net.Sockets;
  29
  30 namespace Npgsql
  31 {
  32     /// <summary>
  33     /// Summary description for NpgsqlQuery
  34     /// </summary>
  35     internal sealed class NpgsqlQuery
  36     {
  37         private NpgsqlCommand _command;
  38         private ProtocolVersion _protocolVersion;
  39
  40         public NpgsqlQuery(NpgsqlCommand command, ProtocolVersion protocolVersion)
  41         {
  42             _command = command;
  43             _protocolVersion = protocolVersion;
  44
  45         }
  46         public void WriteToStream( Stream outputStream, Encoding encoding )
  47         {
  48             //NpgsqlEventLog.LogMsg( this.ToString() + _commandText, LogLevel.Debug  );
  49
  50
  51             String commandText = _command.GetCommandText();
  52
  53             // Tell to mediator what command is being sent.
  54
  55             _command.Connector.Mediator.SqlSent = commandText;
  56
  57             // Send the query to server.
  58             // Write the byte 'Q' to identify a query message.
  59             outputStream.WriteByte((Byte)'Q');
  60
  61             if (_protocolVersion == ProtocolVersion.Version3)
  62             {
  63                 // Write message length. Int32 + string length + null terminator.
  64                 PGUtil.WriteInt32(outputStream, 4 + encoding.GetByteCount(commandText) + 1);
  65             }
  66
  67             // Write the query. In this case it is the CommandText text.
  68             // It is a string terminated by a C NULL character.
  69             PGUtil.WriteString(commandText, outputStream, encoding);
  70         }
  71
  72
  73     }
  74 }