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146 lines
3.8 KiB
146 lines
3.8 KiB
// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as published by
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// the Free Software Foundation
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//
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// There are special exceptions to the terms and conditions of the GPL
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// as it is applied to this software. View the full text of the
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// exception in file EXCEPTIONS in the directory of this software
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// distribution.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Data;
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using MySql.Data.MySqlClient;
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using System.Globalization;
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namespace MySql.Data.Types
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{
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internal struct MySqlSingle : IMySqlValue
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{
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private float mValue;
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private bool isNull;
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public MySqlSingle(bool isNull)
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{
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this.isNull = isNull;
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mValue = 0.0f;
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}
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public MySqlSingle(float val)
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{
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this.isNull = false;
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mValue = val;
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}
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#region IMySqlValue Members
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public bool IsNull
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{
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get { return isNull; }
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}
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MySqlDbType IMySqlValue.MySqlDbType
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{
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get { return MySqlDbType.Float; }
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}
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DbType IMySqlValue.DbType
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{
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get { return DbType.Single; }
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}
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object IMySqlValue.Value
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{
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get { return mValue; }
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}
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public float Value
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{
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get { return mValue; }
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}
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Type IMySqlValue.SystemType
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{
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get { return typeof(float); }
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}
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string IMySqlValue.MySqlTypeName
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{
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get { return "FLOAT"; }
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}
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void IMySqlValue.WriteValue(MySqlPacket packet, bool binary, object val, int length)
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{
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Single v = (val is Single) ? (Single)val : Convert.ToSingle(val);
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if (binary)
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packet.Write(BitConverter.GetBytes(v));
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else
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packet.WriteStringNoNull(v.ToString("R",
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CultureInfo.InvariantCulture));
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}
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IMySqlValue IMySqlValue.ReadValue(MySqlPacket packet, long length, bool nullVal)
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{
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if (nullVal)
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return new MySqlSingle(true);
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if (length == -1)
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{
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byte[] b = new byte[4];
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packet.Read(b, 0, 4);
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return new MySqlSingle(BitConverter.ToSingle(b, 0));
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}
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return new MySqlSingle(Single.Parse(packet.ReadString(length),
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CultureInfo.InvariantCulture));
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}
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void IMySqlValue.SkipValue(MySqlPacket packet)
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{
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packet.Position += 4;
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}
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#endregion
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internal static void SetDSInfo(DataTable dsTable)
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{
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// we use name indexing because this method will only be called
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// when GetSchema is called for the DataSourceInformation
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// collection and then it wil be cached.
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DataRow row = dsTable.NewRow();
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row["TypeName"] = "FLOAT";
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row["ProviderDbType"] = MySqlDbType.Float;
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row["ColumnSize"] = 0;
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row["CreateFormat"] = "FLOAT";
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row["CreateParameters"] = null;
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row["DataType"] = "System.Single";
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row["IsAutoincrementable"] = false;
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row["IsBestMatch"] = true;
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row["IsCaseSensitive"] = false;
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row["IsFixedLength"] = true;
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row["IsFixedPrecisionScale"] = true;
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row["IsLong"] = false;
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row["IsNullable"] = true;
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row["IsSearchable"] = true;
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row["IsSearchableWithLike"] = false;
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row["IsUnsigned"] = false;
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row["MaximumScale"] = 0;
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row["MinimumScale"] = 0;
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row["IsConcurrencyType"] = DBNull.Value;
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row["IsLiteralSupported"] = false;
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row["LiteralPrefix"] = null;
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row["LiteralSuffix"] = null;
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row["NativeDataType"] = null;
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dsTable.Rows.Add(row);
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}
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}
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} |