public void DeleteNode(TreeNode node)
{
if (node.Tag is Conference)
{
DBHelper.DeleteConferences(new int[] { (node.Tag as Conference).ConferenceID });
}
else if (node.Tag is Participant)
{
DBHelper.DeleteParticipants(new int[] { (node.Tag as Participant).ParticipantID });
}
else if (node.Tag is Stream)
{
DBHelper.DeleteStreams(new int[] { (node.Tag as Stream).StreamID });
}
else // it's a year, month, or day, so do search for conferences
{
// We'll do this with a really simple recursive-style approach.
// Iterate over a shallow copy since we'll be deleting from the main Nodes collection.
TreeNode[] tmp = new TreeNode[node.Nodes.Count];
node.Nodes.CopyTo(tmp, 0);
foreach (TreeNode child in tmp)
{
DeleteNode(child);
}
}
this.RemoveNodes(new TreeNode[] { node });
}
public void DeleteNode(TreeNode node)
{
if (node.Tag is Conference)
{
DBHelper.DeleteConferences(new int[] { (node.Tag as Conference).ConferenceID });
}
else if (node.Tag is Participant)
{
DBHelper.DeleteParticipants(new int[] { (node.Tag as Participant).ParticipantID });
}
else if (node.Tag is Stream)
{
DBHelper.DeleteStreams(new int[] { (node.Tag as Stream).StreamID });
}
else // it's a year, month, or day, so do search for conferences
{
// We'll do this with a really simple recursive-style approach...
foreach (TreeNode child in node.Nodes)
{
DeleteNode(child);
}
}
this.RemoveNodes(new TreeNode[] { node });
}
public void DeleteConferences(TreeNode[] nodes)
{
int[] confIDs = new int[nodes.Length];
for (int cnt = 0; cnt < confIDs.Length; ++cnt)
{
confIDs[cnt] = ((nodes[cnt] as TreeNode).Tag as Conference).ConferenceID;
}
DBHelper.DeleteConferences(confIDs);
RemoveNodes(nodes);
}
/// <summary>
/// Deletes the data in the database that a node corresponds to, if any.
/// </summary>
private void DeleteNodeContents(TreeNode emptyNode)
{
if (emptyNode.Tag is Conference)
{
DBHelper.DeleteConferences(new int[] { (emptyNode.Tag as Conference).ConferenceID });
}
else if (emptyNode.Tag is Participant)
{
DBHelper.DeleteParticipants(new int[] { (emptyNode.Tag as Participant).ParticipantID });
}
else if (emptyNode.Tag is Stream)
{
DBHelper.DeleteStreams(new int[] { (emptyNode.Tag as Stream).StreamID });
}
}
public void CleanUpDatabase()
{
// Find:
// - conferences w/o participants
// - participants w/o streams
// - streams w/o bytes
ArrayList confs = new ArrayList(), parts = new ArrayList(), streams = new ArrayList();
#region Depth-first-search of tree
// By collecting a full list of the conferences, participants, and streams to be deleted
// we can more effeciently delete the objects by doing quick bulk deletes from the database,
// rather than transacting for each individual delete.
foreach (TreeNode yearNode in Nodes)
{
foreach (TreeNode monthNode in yearNode.Nodes)
{
foreach (TreeNode dateNode in monthNode.Nodes)
{
foreach (TreeNode confNode in dateNode.Nodes)
{
if (!confNode.Nodes.GetEnumerator().MoveNext()) // check for emptiness
{
confs.Add(confNode);
}
else
{
foreach (TreeNode partNode in confNode.Nodes)
{
if (!partNode.Nodes.GetEnumerator().MoveNext())
{
parts.Add(partNode);
}
else
{
foreach (TreeNode streamNode in partNode.Nodes)
{
if ((streamNode.Tag as Stream).Bytes <= 1)
{
streams.Add(streamNode);
}
}
}
}
}
}
}
}
}
#endregion
#region Transact on DB for Delete:
// - conferences
int[] confIDs = new int[confs.Count];
for (int cnt = 0; cnt < confIDs.Length; ++cnt)
{
confIDs[cnt] = ((confs[cnt] as TreeNode).Tag as Conference).ConferenceID;
}
DBHelper.DeleteConferences(confIDs);
// - participants
int[] partIDs = new int[parts.Count];
for (int cnt = 0; cnt < partIDs.Length; ++cnt)
{
partIDs[cnt] = ((parts[cnt] as TreeNode).Tag as Participant).ParticipantID;
}
DBHelper.DeleteParticipants(partIDs);
// - streams
int[] streamIDs = new int[streams.Count];
for (int cnt = 0; cnt < streamIDs.Length; ++cnt)
{
streamIDs[cnt] = ((streams[cnt] as TreeNode).Tag as Stream).StreamID;
}
DBHelper.DeleteStreams(streamIDs);
#endregion
// Delete from UI
RemoveNodes(confs);
RemoveNodes(parts);
RemoveNodes(streams);
// Find Conferences w/o end times
// (for simplicity, just get them from the DB again)
Conference[] allConfs = DBHelper.GetConferences();
foreach (Conference conf in allConfs)
{
if (conf.End == DateTime.MinValue)
{
DBHelper.CreateConferenceEndTime(conf.ConferenceID);
}
}
}
