public int WriteRow(StorageDataReader dataReader)
{
throw new InvalidOperationException("This type of writer is meant to write values from a list of cell values only.");
}
/// <summary>
/// Writes an entire row to the file stream
/// </summary>
/// <param name="reader">A primed reader</param>
/// <returns>Number of bytes used to write the row</returns>
public int WriteRow(StorageDataReader reader)
{
// Read the values in from the db
object[] values = new object[reader.Columns.Length];
if (!reader.HasLongColumns)
{
// get all record values in one shot if there are no extra long fields
reader.GetValues(values);
}
// Loop over all the columns and write the values to the temp file
int rowBytes = 0;
for (int i = 0; i < reader.Columns.Length; i++)
{
DbColumnWrapper ci = reader.Columns[i];
if (reader.HasLongColumns)
{
if (reader.IsDBNull(i))
{
// Need special case for DBNull because
// reader.GetValue doesn't return DBNull in case of SqlXml and CLR type
values[i] = DBNull.Value;
}
else
{
if (!ci.IsLong)
{
// not a long field
values[i] = reader.GetValue(i);
}
else
{
// this is a long field
if (ci.IsBytes)
{
values[i] = reader.GetBytesWithMaxCapacity(i, maxCharsToStore);
}
else if (ci.IsChars)
{
Debug.Assert(maxCharsToStore > 0);
values[i] = reader.GetCharsWithMaxCapacity(i,
ci.IsXml ? maxXmlCharsToStore : maxCharsToStore);
}
else if (ci.IsXml)
{
Debug.Assert(maxXmlCharsToStore > 0);
values[i] = reader.GetXmlWithMaxCapacity(i, maxXmlCharsToStore);
}
else
{
// we should never get here
Debug.Assert(false);
}
}
}
}
// Get true type of the object
Type tVal = values[i].GetType();
// Write the object to a file
if (tVal == typeof(DBNull))
{
rowBytes += WriteNull();
}
else
{
if (ci.IsSqlVariant)
{
// serialize type information as a string before the value
string val = tVal.ToString();
rowBytes += WriteString(val);
}
// Use the appropriate writing method for the type
Func <object, int> writeMethod;
if (writeMethods.TryGetValue(tVal, out writeMethod))
{
rowBytes += writeMethod(values[i]);
}
else
{
rowBytes += WriteString(values[i].ToString());
}
}
}
// Flush the buffer after every row
FlushBuffer();
return(rowBytes);
}
