Datatable parent child relationship c#
WebJan 16, 2024 · I want to write a simple application that takes data from a database and formats it to a Json file. The catch is, that the views from which I'm getting the data are supposed to be changeable. That means the Json can't be serialized from a rootclass. Also, I need to make sure if the tables have a parent/child connection this is depicted as well. WebJun 20, 2014 · 3 Answers Sorted by: 7 You could use this approach: Get all the items from the database (without filling the SubItems). Build a Lookup of parent ids and items with that parent id. Loop through the items and associate each item with the subitems using the lookup. Code:
Datatable parent child relationship c#
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WebJun 18, 2013 · ParentDataGridView.DataSource = parentBindingSource; ChildDataGridView.DataSource = childBindingSource; // (Most of) your code here: DataSet dSet = new DataSet (); DataTable ParentList = ListToDataTable (_listOfAllAlbumObjects); DataTable ChildList = ListToDataTable (_listOfAllTrackObjects); dSet.Tables.AddRange … WebMar 15, 2003 · If you update just one DataTable, there is no big deal in creating the code for the DataAdapter, but if you work on more than one table, and these tables have a parent-child relationship, the update/insert process can be a little tricky, specially if the parent table has an IDENTITY/AutoNumber column.
WebOct 29, 2024 · 1 Answer. Sorted by: 1. In LINQ it looks something like: collection .GroupBy (e => new { e.Parent, e.Child } ) .Select (g => new { g.Key.Parent, g.Key.Child, g.Count () }); GroupBy doesn't really group in the SQL sense of the word because it preserves the row data. As the result of this group you get something like a dictionary where the item ... WebJan 11, 2024 · There is just one step remaining - when the site label is updated in the parent table, we need to reflect that in the child table. We can do that using the …
WebJul 22, 2016 · Here's the important part, considering that you already have a DataSet containing two DataTables and a DataRelation: 'Bind the parent source to the parent table. Me.BindingSource1.DataSource = data Me.BindingSource1.DataMember = "Parent" 'This is the name of the parent DataTable. 'Bind the child source to the relationship. WebOct 13, 2016 · There are 2 methods in my mind: 1) The Loop Method i) Loop & find the Base/root nodes (nodes with parent as 0) ii) Loop & find the nodes with the base nodes as their parent iii) Add them to the base node's children collection However the above method is best applicable for a tree of depth 2, meaning the root & their immediate child levels.
WebSep 15, 2024 · In the ADO.NET DataSet, the relationship between tables is implemented using a DataRelation. When you create a DataRelation, the parent-child relationships …
WebSep 15, 2024 · If a relationship exists between tables in a DataSet, you can create a DataView containing rows from the related child table by using the CreateChildView method of the DataRowView for the rows in the parent table. camp hidden valley white hall mdWebDecember 2024 Answer . Since you are not using Editor there isn't much you need to do with the master/parent table. It needs to have the select extension and set for single row selection. The child table will use the ajax.data option to … camp hidden meadowsWebSep 15, 2024 · In a relational representation of data, individual tables contain rows that are related to one another using a column or set of columns. In the ADO.NET DataSet, the relationship between tables is implemented using a DataRelation. When you create a DataRelation, the parent-child relationships of the columns are managed only through … camp hickory hill new yorkWebCreate DataRelation between child and parent tables and set it to cascade on updates. That way whenever parent Id changes, all children will be updated. Dim rel = ds.Relations.Add (parentTab.Columns ("Id"), childTab.Columns ("ParentId")) rel.ChildKeyConstraint.UpdateRule = Rule.Cascade first united methodist church humboldt tnWebNov 2, 2007 · You would put both of those results into a single DataSet as DataTables, and then create a relation between the two (on the CustomerID column). Now, in our DataSet, we have a parent-child relation and each row in the parent Customers DataTable will have related child rows in the Products DataTable. first united methodist church huntsville alWebFeb 15, 2024 · var result = dbContext.TestParents .Where (parent => ...) // if you don't want all testParents .Select (parent => new { // select only the properties you plan to use Id = parent.Id, Name = parent.Name, Children = parent.TestChildren .Where (child => child.TestTag.Name = "My Test Tag Name") .Select (child => new { Name = … camp hidden falls girl scoutsWebJun 21, 2016 · I have a DataTable of the CaseNotes that I need to display. The Parent/Child is defined as: If the row has a ParentNoteID then it is a childNode of that note otherwise it is a rootNode. It could also be a parent note(but not a rootNode) if another row has it's ID as it's ParentNoteID. first united methodist church imperial ne