parent-child

问题 At the time my TreeItem in TreeTableView looks flat and like this: //////////////////row////////////////////////////// for (Entry<String, String> entryRow : dc.getSortedfuncAll().entrySet()) { root.getChildren().add(new TreeItem<String>(entryRow.getValue())); } // ////////////////treetable//////////////////////////// final TreeTableView<String> treeTableView = new TreeTableView<>(root); AUF_1086686287581_9999 AUF_1086686329972_10049 AUF_1079023138936_6682 AUF_1087981634453_7022 AUF

问题 How do I calculate a node's depth in a parent-child model under MySQL? I'll need the depth to, among other things, create the indent in my list (coded with PHP). 回答1: That depends on the actual implementation of your hierarchy in the database. If you are using nested sets model (http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/) you can retrieve the full parent-to-child path via a single select. Update : Ok, since you're going with adjacency list model I suggest to store

问题 Im trying to pause the display of a child element when it's parent is hovered over. Html: <span> <div>This Is The Child</div> Some Text in the span </span> Css: span { position: relative; } span div { display: none; width: 0px; opacity: 0; transition: width 5s; -webkit-transition: width 5s; transition: opacity 5s; -webkit-transition: opacity 5s; } span:hover div { display: inline-block; width: 150px; opacity: 1; }​ As of right now, when the span is hovered, the div has no delay before it is

问题 I have core data nested contexts setup. Main queue context for UI and saving to SQLite persistent store. Private queue context for syncing data with the web service. My problem is the syncing process can take a long time and there are the chance that the syncing object is deleted in the Main queue context. When the private queue is saved, it will crash with the "Core Data could not fulfill faulted" exception. Do you have any suggestion on how to check this issue or the way to configure the

问题 I have handle and pid of main process / window. I want to get the children of the process / window - only the visual windows with title. to achieve what I want, I used the following: [DllImport("user32.dll")] private static extern int EnumWindows(EnumWindowsProc ewp, int lParam); [DllImport("user32.dll", SetLastError = true)] static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId); [DllImport("user32.dll")] private static extern bool IsWindowVisible(int hWnd);

问题 I'm currently using a standard one-to-one relationship to handle parent/child relationships: class Category < ActiveRecord::Base has_one :category belongs_to :category end Is there a recommended way to do it or is this ok? 回答1: You will need to tweak the names you are using to get this working - you specify the name of the relationship, and then tell AR what the class is: class Category < ActiveRecord::Base has_one :child, :class_name => "Category" belongs_to :parent, :class_name => "Category

问题 I have a xml structure as follows: <rurl modify="0" children="yes" index="8" name="R-URL"> <status>enabled</status> <rurl-link priority="3">http</rurl-link> <rurl-link priority="5">http://localhost:80</rurl-link> <rurl-link priority="4">abc</rurl-link> <rurl-link priority="3">b</rurl-link> <rurl-link priority="2">a</rurl-link> <rurl-link priority="1">newlinkkkkkkk</rurl-link> </rurl> Now, I want to remove a child node, where text is equal to http. currently I am using this code: while

问题 I want you to know before I get started that I have been looking at all of the sub sub menu questions and I didn't see anything that could help the code I already have laid out. I appreciate any help at all that anybody can give me. So, I am trying to add a sub sub menu and I thought I had figured it out, but I don't think I quite understand how to get the child combinators to work. If you could take a look at that part of the code specifically, you would be on my 'saint list.' ETA: Oh yeah,

问题 Would someone kindly assist me with the following? I have two DataGridView objects that each display a DataTable, where the two datatables are related with the following code: DataSet dSet = new DataSet(); DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects); DataTable ChildList = ListToDataTable(_listOfAllTrackObjects); dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList}); DataColumn parentRelationColumn = ParentList.Columns["AlbumId"]; DataColumn childRelationColumn =

问题 Would someone kindly assist me with the following? I have two DataGridView objects that each display a DataTable, where the two datatables are related with the following code: DataSet dSet = new DataSet(); DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects); DataTable ChildList = ListToDataTable(_listOfAllTrackObjects); dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList}); DataColumn parentRelationColumn = ParentList.Columns["AlbumId"]; DataColumn childRelationColumn =