/// <summary>
/// Gets the next results and add the rows to the current RowSet queue
/// </summary>
protected virtual void PageNext()
{
if (IsFullyFetched)
{
return;
}
if (FetchNextPage == null)
{
//There is no handler, clear the paging state
this.PagingState = null;
return;
}
lock (_pageLock)
{
var pageState = this.PagingState;
if (pageState == null)
{
return;
}
bool value;
bool alreadyPresent = _pagers.TryGetValue(pageState, out value);
if (alreadyPresent)
{
return;
}
var rs = FetchNextPage(pageState);
foreach (var newRow in rs.RowQueue)
{
RowQueue.Enqueue(newRow);
}
PagingState = rs.PagingState;
_pagers.AddOrUpdate(pageState, true, (k, v) => v);
}
}
/// <summary>
/// Adds a row to the inner row list
/// </summary>
internal virtual void AddRow(Row row)
{
if (RowQueue == null)
{
throw new InvalidOperationException("Can not append a Row to a RowSet instance created for VOID results");
}
RowQueue.Enqueue(row);
}
/// <summary>
/// Adds a row to the inner row list
/// </summary>
internal virtual void AddRow(Row row)
{
RowQueue.Enqueue(row);
}
// --- Higer Level Functions ---
public DataSet GetDataset(int MaxRows)
{
bool OldColumnHeaders = ColumnHeaders;
ColumnHeaders = false;
if (!InitRead())
{
return(null);
}
ColumnHeaders = OldColumnHeaders;
m_MaxRows = MaxRows;
int i;
DataSet DS = new DataSet();
DataTable DT = new DataTable();
bCancel = false;
string strColumnName;
if (ColumnHeaders)
{
for (i = 0; i <= m_ColumnCount - 1; i++)
{
strColumnName = ColumnValues[i].Trim();
if (strColumnName == "")
{
strColumnName = "Column" + i.ToString();
}
try
{
DT.Columns.Add(strColumnName, Type.GetType("System.String"));
}
catch
{
strColumnName = "Column" + i.ToString();
DT.Columns.Add(strColumnName, Type.GetType("System.String"));
}
}
if (!EOF)
{
if (!MoveNext())
{
return(null);
}
}
m_RecordCount = 1;
}
else
{
for (i = 0; i <= m_ColumnCount - 1; i++)
{
DT.Columns.Add("Column" + i.ToString(), Type.GetType("System.String"));
}
}
DataRow Row;
int Percent;
if (!EOF)
{
if (ProgressChangeEvent != null)
{
ProgressChangeEvent(0);
}
while (!EOF && !bCancel)
{
Row = DT.NewRow();
for (i = 0; i <= m_ColumnCount - 1; i++)
{
try
{
Row[i] = Strings.ConvertNull(ColumnValues[i]);
}
catch (Exception)
{
}
}
if (Queued)
{
RowQueue.Enqueue(Row);
}
else
{
DT.Rows.Add(Row);
}
if (!MoveNext())
{
return(null);
}
Percent = PercentDone;
if (ProgressChangeEvent != null)
{
ProgressChangeEvent(Percent);
}
if (MaxRows > 0 && m_RecordCount > MaxRows)
{
break;
}
}
if (ProgressChangeEvent != null)
{
ProgressChangeEvent(100);
}
}
//if (Queued)
// RowQueue.Quit();
DS.Tables.Add(DT);
return(DS);
}
