dev-npgsql/npgsql: Npgsql is the .NET data provider for PostgreSQL.

src/Npgsql/FrontendMessages/ExecuteMessage.cs
76 строк3 KB
Julius Vitkauskas
Fix logic typos
18 окт 2018, 23:44
18 окт 2018, 23:44faf5fd2
#region License
// The PostgreSQL License
//
// Copyright (C) 2018 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;

namespace Npgsql.FrontendMessages
{
    class ExecuteMessage : SimpleFrontendMessage
    {
        internal static readonly ExecuteMessage DefaultExecute = new ExecuteMessage();

        internal string Portal { get; private set; } = "";
        internal int MaxRows { get; private set; }

        const byte Code = (byte)'E';

        internal ExecuteMessage Populate(string portal = "", int maxRows = 0)
        {
            Portal = portal;
            MaxRows = maxRows;
            return this;
        }

        internal ExecuteMessage Populate(int maxRows) => Populate("", maxRows);

        internal override int Length => 1 + 4 + 1 + 4;

        internal override void WriteFully(NpgsqlWriteBuffer buf)
        {
            Debug.Assert(Portal != null && Portal.All(c => c < 128));

            buf.WriteByte(Code);
            buf.WriteInt32(Length - 1);
            Debug.Assert(Portal == string.Empty);
            buf.WriteByte(0);   // Portal is always an empty string
            buf.WriteInt32(MaxRows);
        }

        public override string ToString()
        {
            var sb = new StringBuilder();
            sb.Append("[Execute");
            if (Portal != "" && MaxRows != 0)
            {
                sb.Append("Portal=").Append(Portal);
                sb.Append("MaxRows=").Append(MaxRows);
            }
            sb.Append(']');
            return sb.ToString();
        }
    }
}