ntpa/Ntp.Analyzer.Data/Static/HostDatabaseMapper.cs

//
// HostDatabaseMapper.cs
//
// Author:
//       Carsten Sonne Larsen <cs@innolan.net>
//
// Copyright (c) 2014 Carsten Sonne Larsen
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using Ntp.Analyzer.Objects;

namespace Ntp.Analyzer.Data.Static
{
    /// <summary>
    /// ORM mapper for table host.
    /// </summary>
    public sealed class HostDatabaseMapper : DatabaseMapper<Host>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="HostDatabaseMapper"/> class.
        /// </summary>
        internal HostDatabaseMapper()
        {
        }

        protected override bool UseCache
        {
            get { return true; }
        }

        private const string SelectSql =
            "SELECT id, name, ip, orgId FROM host;";

        private const string InsertSql =
            "INSERT INTO host(name, ip, orgId) VALUES(@name, @ip, @orgId);" +
            "SELECT LAST_INSERT_ID();";

        protected override void Insert(Host item)
        {
            lock (Locker)
            {
                try
                {
                    Open();

                    Command.CommandText = InsertSql;
                    Command.Prepare();

                    Command.Parameters.AddWithValue("@name", item.Name);
                    Command.Parameters.AddWithValue("@ip", item.Ip);
                    Command.Parameters.AddWithValue("@orgId", item.OrgId);

                    object idObject = Command.ExecuteScalar();
                    item.SetId(Convert.ToInt32(idObject));
                }
                finally
                {
                    Close();
                }
            }
        }

        protected override void Update(Host item)
        {
            lock (Locker)
            {
                try
                {
                    Open();

                    Command.CommandText = "UPDATE host SET name = @name, ip=@ip, orgId=@orgId WHERE id=@id";
                    Command.Prepare();

                    Command.Parameters.AddWithValue("@name", item.Name);
                    Command.Parameters.AddWithValue("@ip", item.Ip);
                    Command.Parameters.AddWithValue("@orgId", item.OrgId);
                    Command.Parameters.AddWithValue("@id", item.Id);
                    Command.ExecuteScalar();
                }
                finally
                {
                    Close();
                }
            }
        }

        /// <summary>
        /// Read all data from table in a sequential manner.
        /// </summary>
        /// <returns>The enumerator.</returns>
        public override IEnumerator<Host> GetEnumerator()
        {
            lock (Locker)
            {

                if (HasContent)
                {
                    foreach (Host host in Content)
                        yield return host;

                    yield break;
                }

                try
                {
                    Open();
                    Command.CommandText = SelectSql;
                    Reader = Command.ExecuteReader();

                    while (Reader.Read())
                    {
                        int id = Convert.ToInt32(Reader["id"]);
                        string name = Reader["name"].ToString();
                        string ip = Reader["ip"].ToString();
                        int orgId = Convert.ToInt32(Reader["orgId"]);

                        Host host = new Host(id, name, ip, orgId);
                        AddItem(host);

                        yield return host;
                    }
                }
                finally
                {
                    Close();
                }
            }
        }
    }
}