/
DescribeMessage.cs
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/
DescribeMessage.cs
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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
{
class DescribeMessage : SimpleFrontendMessage
{
/// <summary>
/// The name of the prepared statement or portal to describe (an empty string selects the unnamed prepared statement or portal).
/// </summary>
internal string Name { get; set; }
/// <summary>
/// Whether to describe a statement or a portal
/// </summary>
internal StatementOrPortal StatementOrPortal { get; set; }
const byte Code = (byte)'D';
internal DescribeMessage Populate(StatementOrPortal type, string name = "")
{
StatementOrPortal = type;
Name = name;
return this;
}
internal override int Length => 1 + 4 + 1 + (Name.Length + 1);
internal override void Write(NpgsqlBuffer buf)
{
Contract.Requires(Name != null && Name.All(c => c < 128));
buf.WriteByte(Code);
buf.WriteInt32(Length - 1);
buf.WriteByte((byte)StatementOrPortal);
buf.WriteBytesNullTerminated(Encoding.ASCII.GetBytes(Name));
}
public override string ToString()
{
return $"[Describe({StatementOrPortal}={Name})]";
}
}
}