FLocal/ThirdParty/mysql-connector-net-6.2.3/MySql.Data/Provider/Source/Types/MySqlByte.cs

// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation
//
// There are special exceptions to the terms and conditions of the GPL 
// as it is applied to this software. View the full text of the 
// exception in file EXCEPTIONS in the directory of this software 
// distribution.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System;
using System.Data;
using MySql.Data.MySqlClient;
using System.Globalization;

namespace MySql.Data.Types
{
	internal struct MySqlByte : IMySqlValue
	{
		private sbyte mValue;
		private bool isNull;
        private bool treatAsBool;

		public MySqlByte(bool isNull)
		{
			this.isNull = isNull;
			mValue = 0;
            treatAsBool = false;
		}

		public MySqlByte(sbyte val)
		{
			this.isNull = false;
			mValue = val;
            treatAsBool = false;
        }

		#region IMySqlValue Members

		public bool IsNull
		{
			get { return isNull; }
		}

		MySqlDbType IMySqlValue.MySqlDbType
		{
			get { return MySqlDbType.Byte; }
		}

		DbType IMySqlValue.DbType
		{
			get 
            {
                if (TreatAsBoolean)
                    return DbType.Boolean;
                return DbType.SByte; 
            }
		}

		object IMySqlValue.Value
		{
			get 
            {
                if (TreatAsBoolean)
                    return Convert.ToBoolean(mValue); 
                return mValue; 
            }
		}

		public sbyte Value
		{
			get { return mValue; }
            set { mValue = value; }
		}

		Type IMySqlValue.SystemType
		{
			get 
            {
                if (TreatAsBoolean)
                    return typeof(Boolean); 
                return typeof(sbyte); 
            }
		}

		string IMySqlValue.MySqlTypeName
		{
			get { return "TINYINT"; }
		}

        void IMySqlValue.WriteValue(MySqlPacket packet, bool binary, object val, int length)
		{
            sbyte v = (val is sbyte) ? (sbyte)val : Convert.ToSByte(val);
			if (binary)
                packet.WriteByte((byte)v);
			else
                packet.WriteStringNoNull(v.ToString());
		}

        IMySqlValue IMySqlValue.ReadValue(MySqlPacket packet, long length, bool nullVal)
		{
			if (nullVal)
				return new MySqlByte(true);

			if (length == -1)
                return new MySqlByte((sbyte)packet.ReadByte());
			else
			{
                string s = packet.ReadString(length);
				MySqlByte b = new MySqlByte(SByte.Parse(s, NumberStyles.Any, CultureInfo.InvariantCulture));
                b.TreatAsBoolean = TreatAsBoolean;
                return b;
			}
		}

        void IMySqlValue.SkipValue(MySqlPacket packet)
		{
            packet.ReadByte();
		}

		#endregion

        internal bool TreatAsBoolean
        {
            get { return treatAsBool; }
            set { treatAsBool = value; }
        }

		internal static void SetDSInfo(DataTable dsTable)
		{
			// we use name indexing because this method will only be called
			// when GetSchema is called for the DataSourceInformation 
			// collection and then it wil be cached.
			DataRow row = dsTable.NewRow();
			row["TypeName"] = "TINYINT";
			row["ProviderDbType"] = MySqlDbType.Byte;
			row["ColumnSize"] = 0;
			row["CreateFormat"] = "TINYINT";
			row["CreateParameters"] = null;
			row["DataType"] = "System.SByte";
			row["IsAutoincrementable"] = true;
			row["IsBestMatch"] = true;
			row["IsCaseSensitive"] = false;
			row["IsFixedLength"] = true;
			row["IsFixedPrecisionScale"] = true;
			row["IsLong"] = false;
			row["IsNullable"] = true;
			row["IsSearchable"] = true;
			row["IsSearchableWithLike"] = false;
			row["IsUnsigned"] = false;
			row["MaximumScale"] = 0;
			row["MinimumScale"] = 0;
			row["IsConcurrencyType"] = DBNull.Value;
			row["IsLiteralSupported"] = false;
			row["LiteralPrefix"] = null;
			row["LiteralSuffix"] = null;
			row["NativeDataType"] = null;
			dsTable.Rows.Add(row);
		}
	}
}