hierarchy

Let's say you have the following table: items(item_id, item_parent) ... and it is a self-referencing table - item_parent refers to item_id . What SQL query would you use to SELECT all items in the table along with their depth where the depth of an item is the sum of all parents and grand parents of that item. If the following is the content of the table: item_id item_parent ----------- ----------- 1 0 2 0 3 2 4 2 5 3 ... the query should retrieve the following set of objects: {"item_id":1,"depth":0} {"item_id":2,"depth":0} {"item_id":3,"depth":1} {"item_id":4,"depth":1} {"item_id":5,"depth":2}

I have a Table that stores Hierarchical information using the Adjacency List model. (uses a self referential key - example below. This Table may look familiar ): category_id name parent ----------- -------------------- ----------- 1 ELECTRONICS NULL 2 TELEVISIONS 1 3 TUBE 2 4 LCD 2 5 PLASMA 2 6 PORTABLE ELECTRONICS 1 7 MP3 PLAYERS 6 8 FLASH 7 9 CD PLAYERS 6 10 2 WAY RADIOS 6 What is the best method to "flatten" the above data into something like this? category_id lvl1 lvl2 lvl3 lvl4 ----------- ----------- ----------- ----------- ----------- 1 1 NULL NULL NULL 2 1 2 NULL NULL 6 1 6 NULL NULL 3

Hi I have a table which references itself and I need to be able to select the parent and all it's child records from a given parent Id. My table is as follows: ID | ParentID | Name ----------------------- 1 NULL A 2 1 B-1 3 1 B-2 4 2 C-1 5 2 C-2 So for the above example I'd like to be able to pass in a value of 1 and get all the records above. So far, I've come up with the following recursive table-valued-function but it's not behaving as expected (only returning the first record). CREATE FUNCTION [dbo].[SelectBranches] ( @id INT ,@parentId INT ) RETURNS @branchTable TABLE ( ID INT ,ParentID

This one has me stumped. I need to call an activity method from within a custom layout class. The problem with this is that I don't know how to access the activity from within the layout. ProfileView public class ProfileView extends LinearLayout { TextView profileTitleTextView; ImageView profileScreenImageButton; boolean isEmpty; ProfileData data; String name; public ProfileView(Context context, AttributeSet attrs, String name, final ProfileData profileData) { super(context, attrs); ...... ...... } //Heres where things get complicated public void onClick(View v) { //Need to get the parent

I have an array that looks like the following: [ 'applicant' => [ 'user' => [ 'username' => true, 'password' => true, 'data' => [ 'value' => true, 'anotherValue' => true ] ] ] ] What I want to be able to do is convert that array into an array that looks like: [ 'applicant.user.username', 'applicant.user.password', 'applicant.user.data.value', 'applicant.user.data.anotherValue' ] Basically, I need to somehow loop through the nested array and every time a leaf node is reached, save the entire path to that node as a dot separated string. Only keys with true as a value are leaf nodes, every other

I have a package like this package/ __init__.py subpackage1/ __init__.py moduleA.py moduleB.py moduleC.py moduleD.py subpackage2/ __init__.py moduleX.py moduleY.py moduleZ.py In moduleB.py, I am importing from moduleA import bar In moduleA, I am importing from moduleB import foo I am getting ImportError. ImportError: cannot import name foo What could be the problem here ? and to avoid this problem, what should I do ? and what should I write in _ init _ .py pf package, subpackage1, subpackage2 ? _ init _ .py of subpackage1 from moduleA import * from moduleB import * from moudleC import * from

C# | .NET 4.5 | Entity Framework 5 I have data coming back from a SQL Query in the form of ID,ParentID,Name. I'd like to take that data and parse it into a Hierarchical JSON string. So far it seems to be much more of a daunting task than it should be. Since I'm using Entity the data comes back nicely to me as an IEnumerable. Now I believe I just need some form of recursion, but I'm not quite sure where to start. Any help is appreciated. Data Returns as id parentId name 1 1 TopLoc 2 1 Loc1 3 1 Loc2 4 2 Loc1A Code is public static string GetJsonLocationHierarchy(long locationID) { using

Let say we have a class Category { ID, Name, ParentID } and a List 1, 'Item 1', 0 2, 'Item 2', 0 3, 'Item 3', 0 4, 'Item 1.1', 1 5, 'Item 3.1', 3 6, 'Item 1.1.1', 4 7, 'Item 2.1', 2 Can we using LINQ to render a tree like: Item 1 Item 1.1 Item 1.1.1 Item 2 Item 2.1 Item 3 Item 3.1 Any help is appreciated! Here's the "LINQ-only" version: Func<int, int, string[]> build = null; build = (p, n) => { return (from x in categories where x.ParentID == p from y in new[] { "".PadLeft(n)+ x.Name }.Union(build(x.ID, n + 1)) select y).ToArray(); }; var lines = build(0, 0); Yes, it's recursive LINQ. Per NVA