public static bool canRead(this HanaDataReader reader, string tag, out int ordinal)
{
ordinal = -1;
bool can = true;
try { ordinal = reader.GetOrdinal(tag); }
catch (IndexOutOfRangeException)
{
throw;
}
if (ordinal < 0)
{
can = false;
}
if (ordinal > 0)
{
if (reader.IsDBNull(ordinal))
{
can = false;
}
}
return(can);
}