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QueryMessage.cs
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executable file
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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
namespace Npgsql.FrontendMessages
{
/// <summary>
/// A simple query message.
///
/// Note that since this is only used to send some specific control messages (e.g. start transaction)
/// and never arbitrary-length user-provided queries, this message is treated as simple and not chunking,
/// and only ASCII is supported.
/// </summary>
class QueryMessage : SimpleFrontendMessage
{
string Query { get; set; }
internal const byte Code = (byte)'Q';
internal QueryMessage(string query)
{
Contract.Requires(query != null && query.All(c => c < 128), "Not ASCII");
Contract.Requires(PGUtil.UTF8Encoding.GetByteCount(query) + 5 < NpgsqlBuffer.MinimumBufferSize, "Too long");
Query = query;
}
internal override int Length
{
get { return 1 + 4 + (Query.Length + 1); }
}
internal override void Write(NpgsqlBuffer buf)
{
Contract.Requires(Query != null && Query.All(c => c < 128));
buf.WriteByte(Code);
buf.WriteInt32(Length - 1);
buf.WriteBytesNullTerminated(Encoding.ASCII.GetBytes(Query));
}
public override string ToString()
{
return String.Format("[Query={0}]", Query);
}
}
}