Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Try the following code in your aspx or ascx file:</p> <pre><code>&lt;asp:Treeview ID="TreeView1" runat="server" /&gt; </code></pre> <p>And in the codebehind to populate it:</p> <pre><code>private void PopulateTreeView() { DataSet ds = new DataSet(); //(populate the dataset with the table) //Use LINQ to filter out items without a parent DataTable parents = ds.Tables[0].AsEnumerable() .Where(i =&gt; i.Field&lt;object&gt;("parentid") == DBNull.Value) .CopyToDataTable(); //Use LINQ to filter out items with parent DataTable children = ds.Tables[0].AsEnumerable() .Where(i =&gt; i.Field&lt;object&gt;("parentid") != DBNull.Value) .OrderBy(i =&gt; i.Field&lt;int&gt;("parentid")) .CopyToDataTable(); //Add the parents to the treeview foreach(DataRow dr in parents) { TreeNode node = new TreeNode(); node.Text = dr["name"].ToString(); node.Value = dr["id"].ToString(); TreeView1.Nodes.Add(node); } //Add the children to the parents foreach(DataRow dr in children) { TreeNode node = new TreeNode(); node.Text = dr["name"].ToString(); node.Value = dr["id"].ToString(); TreeNode parentNode = FindNodeByValue(dr["parentid"].ToString()); if(parentNode != null) parentNode.ChildNodes.Add(node); } } private TreeNode FindNodeByValue(string value) { foreach(TreeNode node in TreeView1.Nodes) { if(node.Value = value) return node; TreeNode pnode = FindNodeRecursion(node, value); if(pnode != null) return pnode; } return null; } private TreeNode FindNodeRecursion(TreeNode parentNode, string value) { foreach(TreeNode node in parentNode.ChildNodes) { if(node.Value = value) return node; TreeNode pnode = FindNodeRecursion(node, value); if(pnode != null) return pnode; } return null; } </code></pre> <p>There might be a better way to do this and I haven't tested it, but it should work. Or you could always try out <a href="http://demos.telerik.com/aspnet-ajax/treeview/examples/overview/defaultcs.aspx" rel="nofollow">Telerik</a> or another third party tool that makes data binding for these types of controls super easy.</p>
    singulars
    1. This table or related slice is empty.
    1. POTreeview from sql table
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USWill P.
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload