/// <summary>
/// Retrieves a column as an array of chars (blob)
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <param name="fieldoffset">The zero-based index of where to begin reading the data</param>
/// <param name="buffer">The buffer to write the characters into</param>
/// <param name="bufferoffset">The zero-based index of where to begin writing into the array</param>
/// <param name="length">The number of bytes to retrieve</param>
/// <returns>The actual number of characters written into the array</returns>
/// <remarks>
/// To determine the number of characters in the column, pass a null value for the buffer. The total length will be returned.
/// </remarks>
public override long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
{
if (i >= VisibleFieldCount && _keyInfo != null)
{
return(_keyInfo.GetChars(i - VisibleFieldCount, fieldoffset, buffer, bufferoffset, length));
}
VerifyType(i, DbType.String);
return(_activeStatement._sql.GetChars(_activeStatement, i, (int)fieldoffset, buffer, bufferoffset, length));
}