/// <inheritdoc/>
public ResultPart GetResultPart(int resultId, int startRow, int countRows)
{
try {
// Get the first few rows of the result..
int dispatchId = connectionThread.GetResultPart(resultId, startRow, countRows);
// Get the response
ServerCommand command = connectionThread.ReceiveCommand(DeveelDbConnection.QueryTimeout, dispatchId);
// If command == null then we timed output
if (command == null)
throw new DataException("Downloading result part timed output after " + DeveelDbConnection.QueryTimeout +
" seconds.");
// Wrap around a DataInputStream
BinaryReader reader = new BinaryReader(command.GetInputStream());
int status = reader.ReadInt32();
if (status == ProtocolConstants.Success) {
// Return the contents of the response.
int colCount = reader.ReadInt32();
int size = countRows * colCount;
ResultPart list = new ResultPart(size);
for (int i = 0; i < size; ++i) {
list.Add(ObjectTransfer.ReadFrom(reader));
}
return list;
}
if (status == ProtocolConstants.Exception) {
int dbCode = reader.ReadInt32();
string message = reader.ReadString();
string stackTrace = reader.ReadString();
throw new DbDataException(message, message, dbCode, stackTrace);
}
throw new DataException("Illegal response code from server.");
} catch (IOException e) {
LogException(e);
throw new DataException("IO Error: " + e.Message);
}
}
/// <inheritdoc/>
public ResultPart GetResultPart(int resultId, int startRow, int countRows)
{
CheckNotDisposed();
ResultSetInfo table = GetResultSet(resultId);
if (table == null)
throw new DbDataException("'resultId' invalid.", null, 4, (Exception) null);
int rowEnd = startRow + countRows;
if (startRow < 0 || startRow >= table.RowCount ||
rowEnd > table.RowCount) {
throw new DbDataException("Result part out of range.", null, 4, (Exception) null);
}
try {
int colCount = table.ColumnCount;
ResultPart block = new ResultPart(countRows*colCount);
for (int r = startRow; r < rowEnd; ++r) {
for (int c = 0; c < colCount; ++c) {
TObject value = table.GetCellContents(c, r);
// If this is a IRef, we must assign it a streamable object
// id that the client can use to access the large object.
object clientOb;
if (value.Object is IRef) {
IRef reference = (IRef) value.Object;
clientOb = new StreamableObject(reference.Type, reference.RawSize, reference.Id);
} else {
clientOb = value.Object;
}
block.Add(clientOb);
}
}
return block;
} catch (Exception e) {
Logger.Warning(this, e);
// If an exception was generated while getting the cell contents, then
// throw an DataException.
throw new DbDataException("Exception while reading results: " + e.Message, e.Message, 4, e);
}
}