/// <summary>
/// Convert from string representation.
/// </summary>
/// <param name="source"></param>
/// <param name="type"></param>
/// <returns></returns>
internal static object ConvertString(string source, ColumnType type)
{
if (source == null)
{
return(null);
}
switch (type)
{
case ColumnType.Null:
return(null);
case ColumnType.Integer:
return(int.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.Float:
case ColumnType.Real:
return(Single.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.DbDouble:
return(Double.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.VarCharIgnoreCase:
case ColumnType.VarChar:
case ColumnType.Char:
case ColumnType.LongVarChar:
return(source);
case ColumnType.Date:
case ColumnType.Time:
case ColumnType.Timestamp:
return(DateTime.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.Numeric:
case ColumnType.DbDecimal:
return(Decimal.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.Bit:
return(Boolean.Parse(source));
case ColumnType.TinyInt:
return(Byte.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.SmallInt:
return(Int16.Parse(source, CultureInfo.InvariantCulture));
case ColumnType.BigInt:
return(Int64.Parse(source));
case ColumnType.Binary:
case ColumnType.VarBinary:
case ColumnType.LongVarBinary:
return(new ByteArray(source).Value);
case ColumnType.Other:
return(ByteArray.Deserialize(new ByteArray(source).Value));
case ColumnType.UniqueIdentifier:
return(new Guid(source));
default:
throw Trace.Error(Trace.FUNCTION_NOT_SUPPORTED, (int)type);
}
}
/// <summary>
/// Write column data to file.
/// </summary>
/// <param name="writer"></param>
/// <param name="length"></param>
/// <param name="type"></param>
/// <param name="data"></param>
internal static void WriteData(BinaryWriter writer, int length, ColumnType[] type, object[] data)
{
for (int i = 0; i < length; i++)
{
object o = data[i];
if (o == null)
{
writer.Write((int)ColumnType.Null);
}
else
{
ColumnType t = type[i];
writer.Write((int)t);
switch (t)
{
case ColumnType.Null:
o = null;
break;
case ColumnType.Float:
case ColumnType.Real:
writer.Write((float)o);
break;
case ColumnType.DbDouble:
writer.Write((double)o);
break;
case ColumnType.Bit:
writer.Write((bool)o);
break;
case ColumnType.TinyInt:
writer.Write((byte)o);
break;
case ColumnType.SmallInt:
writer.Write((short)o);
break;
case ColumnType.DbDecimal:
case ColumnType.Numeric:
writer.Write((Decimal)o);
break;
case ColumnType.Integer:
writer.Write((int)o);
break;
case ColumnType.BigInt:
writer.Write((long)o);
break;
case ColumnType.Date:
case ColumnType.Time:
case ColumnType.Timestamp:
writer.Write(((DateTime)o).Ticks);
break;
case ColumnType.Binary:
case ColumnType.VarBinary:
case ColumnType.LongVarBinary:
byte[] b = (byte[])o;
writer.Write(b.Length);
writer.Write(b);
break;
case ColumnType.Other:
byte[] other = ByteArray.Serialize(o);
writer.Write(other.Length);
writer.Write(other);
break;
case ColumnType.UniqueIdentifier:
writer.Write(((Guid)o).ToString());
break;
default:
writer.Write(o.ToString());
break;
}
}
}
}
/// <summary>
/// Gets the size of the stored data.
/// </summary>
/// <param name="data"></param>
/// <param name="l"></param>
/// <param name="type"></param>
/// <returns></returns>
unsafe private static int GetSize(object[] data, int l, ColumnType[] type)
{
int s = 0;
for (int i = 0; i < l; i++)
{
object o = data[i];
s += 4; // type
if (o != null)
{
switch (type[i])
{
case ColumnType.Char:
case ColumnType.LongVarChar:
case ColumnType.VarChar:
case ColumnType.VarCharIgnoreCase:
s += System.Text.Encoding.Unicode.GetByteCount(o.ToString());
s += 1;
break;
case ColumnType.Float:
case ColumnType.Real:
s += sizeof(float);
break;
case ColumnType.DbDouble:
s += sizeof(double);
break;
case ColumnType.Bit:
s += sizeof(bool);
break;
case ColumnType.TinyInt:
s += sizeof(byte);
break;
case ColumnType.SmallInt:
s += sizeof(short);
break;
case ColumnType.Integer:
s += sizeof(int);
break;
case ColumnType.DbDecimal:
case ColumnType.Numeric:
s += sizeof(Decimal);
break;
case ColumnType.BigInt:
s += sizeof(long);
break;
case ColumnType.Date:
case ColumnType.Time:
case ColumnType.Timestamp:
s += sizeof(long);
break;
case ColumnType.Binary:
case ColumnType.VarBinary:
case ColumnType.LongVarBinary:
s += 4;
s += ((byte[])o).Length;
break;
case ColumnType.Other:
s += 4;
s += ByteArray.Serialize(o).Length;
break;
case ColumnType.UniqueIdentifier:
s += sizeof(Guid);
break;
default:
s += System.Text.Encoding.Unicode.GetByteCount(o.ToString());
s += 1;
break;
}
}
}
return(s);
}
/// <summary>
/// Read column data from file.
/// </summary>
/// <param name="reader"></param>
/// <param name="length"></param>
/// <returns></returns>
internal static object[] ReadData(BinaryReader reader, int length)
{
object[] data = new object[length];
for (int i = 0; i < length; i++)
{
ColumnType type = (ColumnType)Enum.Parse(typeof(ColumnType), reader.ReadInt32().ToString());
object o = null;
switch (type)
{
case ColumnType.Null:
o = null;
break;
case ColumnType.Float:
case ColumnType.Real:
o = reader.ReadSingle();
break;
case ColumnType.DbDouble:
o = reader.ReadDouble();
break;
case ColumnType.VarCharIgnoreCase:
case ColumnType.VarChar:
case ColumnType.Char:
case ColumnType.LongVarChar:
o = reader.ReadString();
break;
case ColumnType.Date:
case ColumnType.Time:
case ColumnType.Timestamp:
o = new DateTime(reader.ReadInt64());
break;
case ColumnType.Numeric:
case ColumnType.DbDecimal:
o = reader.ReadDecimal();
break;
case ColumnType.Bit:
o = reader.ReadBoolean();
break;
case ColumnType.TinyInt:
o = reader.ReadByte();
break;
case ColumnType.SmallInt:
o = reader.ReadInt16();
break;
case ColumnType.Integer:
o = reader.ReadInt32();
break;
case ColumnType.BigInt:
o = reader.ReadInt64();
break;
case ColumnType.Binary:
case ColumnType.VarBinary:
case ColumnType.LongVarBinary:
int len = reader.ReadInt32();
o = reader.ReadBytes(len);
break;
case ColumnType.Other:
int other = reader.ReadInt32();
o = ByteArray.Deserialize(reader.ReadBytes(other));
break;
case ColumnType.UniqueIdentifier:
o = new Guid(reader.ReadString());
break;
default:
throw Trace.Error(Trace.WRONG_DATA_TYPE, (int)type);
}
data[i] = o;
}
return(data);
}