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QueryMessage.cs
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76 lines (66 loc) · 2.49 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2017 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;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Npgsql.FrontendMessages
{
/// <summary>
/// A simple query message.
/// </summary>
class QueryMessage : FrontendMessage
{
readonly Encoding _encoding;
string _query;
const byte Code = (byte)'Q';
internal QueryMessage(Encoding encoding)
{
_encoding = encoding;
}
internal QueryMessage Populate(string query)
{
Debug.Assert(query != null);
_query = query;
return this;
}
internal override async Task Write(NpgsqlWriteBuffer buf, bool async)
{
if (buf.WriteSpaceLeft < 1 + 4)
await buf.Flush(async);
var queryByteLen = _encoding.GetByteCount(_query);
buf.WriteByte(Code);
buf.WriteInt32(4 + // Message length (including self excluding code)
queryByteLen + // Query byte length
1); // Null terminator
await buf.WriteString(_query, queryByteLen, async);
if (buf.WriteSpaceLeft < 1)
await buf.Flush(async);
buf.WriteByte(0);
}
public override string ToString() => $"[Query={_query}]";
}
}