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QueryMessage.cs
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executable file
·49 lines (41 loc) · 1.43 KB
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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);
}
}
}