parent-child

问题 Source Table Folder Table:- folder_id,folder_name,parent_id --------------------------------- 1,7-Zip,NULL 2,7z,1 3,Lang,1 File Table:- file_id,file_name,folder_id --------------------------------- 1,7-zip.chm,1 2,7-zip.dll,1 3,7z.dll,3 4,af.txt,3 when i inserted data, the data structure was like below (Size of DS is 1) [1,7-Zip, childFolders[[2,7z],[3,Lang,childFolders[], childFiles[[3,7z.dll],[4,af.txt]]]], childfiles[[1,7-zip.chm],[2,7-zip.dll]]] when retrieved the data from the data base

问题 I am currently trying to print a message from a child process after calling execlp() within the child. However, nothing appears on the terminal after the call to execlp(). What causes my printf() calls to not display anything, and how can this be resolved? 回答1: After a successful execlp() call, no code in your previous program will ever run again. The process's memory space is overwritten with the new process. If you still need to do some management with the child, then you will want to call

问题 I have seen similar but not Exactly the same requests. If I had the following table Parent Child 1 2 1 3 4 3 5 1 6 1 5 7 8 9 I selected "1" I would expect back all records where one is the parent or child but also all related parents and children for instance row "5 , 7" because 5 is the parent of "1" so the result set for 1 would be Parent Child 1 2 1 3 4 3 5 1 6 1 5 7 So it would NOT include the row Parent Child 8 9 This is as close as I can get so far ;WITH LinksDown AS ( SELECT * FROM

问题 I'm trying to create a table with collapsible columns, but can't get the table body to collapse with the headers. Here's a fiddle which makes it clear what I'm trying to do: https://jsfiddle.net/ufw4f5qc/9/ and here's a fiddle what I tried which is producing an error: https://jsfiddle.net/oafw74hz/2/ The issue is most likely to do with scope of child and parent. I'm passing in a variable from parent to child using props, but it seems like the child does not take it. Am I binding the prop

问题 I am trying to use AutoMapper to map some DTO (data contract) objects received from a web service into my business objects. The root DTO object contains a collection of child objects. My business object also has a child collection of child business objects. In order to get AutoMapper to work, I had to include a setter on the collection property in my business object or the collection would always be empty. In addition, I had to add a default constructor to the collection type. So, it appears

问题 I have a C++ program that acts as a watchdog over others. If it detects that a process is no longer running, it restarts it via system . The problem is, if I kill the watchdog process, any processes it has started up also die. void* ProcessWatchdog::worker(void* arg) { //Check if process is running if( !processRunning ) system("processName /path/to/processConfig.xml &"); } The new child process gets started correctly, and runs without any problems. But when the parent (now this

问题 I want to get all the child and grandchild categories of a parent category upto any level. My table structure goes like this. Can anyone suggest me how to get all the child categories (i.e. Samsung and S3 of phone category). 回答1: You need recursivity. Create a function like this (assuming you use active records): function getCategoriesByParentId($category_id) { $category_data = array(); $category_query = $this->db->query("SELECT * FROM categories WHERE parent_category = '" . (int)$category_id

问题 I am trying to add a child object to a collection of children, but I want to make sure the the latest will be the first. Here is what I am trying to do: GameObject - (My new object here) - GameObject - GameObject - GameObject Here is the code I am using to instantiate my prefab: GameObject messageObj = Instantiate(storyPrefab) as GameObject; messageObj.name = "Story"; messageObj.transform.parent = wallGrid.transform; messageObj.transform.localScale = new Vector3(1,1,1); Hope this makes sense.

问题 I have a product category table with the following fields: cat_id (PK) Cat_name Cat_desc Parent_Cat_Id Now when a user wants to add a product he should be able to select multiple categories from a listbox(multiselection enabaled). But to let the user know the hierarchy of the categories, I need to display them in the following style: parent category 1 parent category 1->sub category 1 parent category 1->sub category 1->sub-sub category 1 parent category 1->sub category 1->sub-sub category 2

问题 Aim To prompt the data of the current user such as name , address , neighbourhood by acquiring them through the Data Tree within Firebase Database Picture of the Data Tree Desrciption The "London" and "Washington" child within the Data Tree are added in by the Admin account, which means that they are not fixed and that an additional child such as "New York" can be added. Which would mean that the newly edited Data Tree will have under "Users", there will be "London", "Washington", and "New