[x]
Posted via EE Mobile

Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.
Question
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!
9.2

fill treeview fast from two tables with 10000 records

Asked by Peev711 in Delphi Programming

hw can a put the data from a two tables in a treeview fast.
the first tables have a 600 records , secon 9000 recors
first one have fields group_id , parent_id,Name
second - group_id ,group_kod,Name
I loock some code and its work but veri slow,about two min.
h>w can this code work fast 
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101:
102:
103:
104:
105:
106:
107:
108:
109:
110:
111:
112:
113:
114:
115:
116:
117:
118:
119:
120:
121:
122:
123:
124:
125:
126:
127:
128:
129:
130:
131:
132:
133:
134:
135:
136:
137:
138:
139:
140:

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, DB, ZAbstractRODataset, ZAbstractDataset,
  ZDataset, ZConnection,  ExtCtrls;
 
 
type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Button1: TButton;
    ZConnection1: TZConnection;
    ZQuery1: TZQuery;
    ZQuery2: TZQuery;
    procedure Button1Click(Sender: TObject);
  private
  Procedure  Load_Tree ;
      { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
Type
  PDataRec = ^TData;
  TData = Record
                       ID  : Integer;
                       PID : Integer;
                       Text: String[150];
                      end;
 
function FindParent(ATreeView : TTreeView; ID : Integer) : TTreeNode;
var i : integer;
begin
  result := nil;
  i := 0;
  while (i < ATreeView.Items.Count) and
        (assigned(ATreeView.Items[i].Data)) and
        (PDataRec(ATreeView.Items[i].Data)^.ID <> ID) do
    inc(i);
  if i < ATreeView.Items.Count then
    result := ATreeView.Items[i];
end;
 
 
Procedure TForm1.Load_Tree;
var
  ANode : TTreeNode;
  RecordCache : PDataRec;
  RecordCacheList : TList;
  I, PreviousCount : Integer;
begin
  TreeView1.Items.Clear ;
  ZQuery1.Close;
  ZQuery1.SQL.Text := 'Select * from NGroups order by group_id';
  RecordCacheList := TList.Create;
  try
    ZQuery1.Open;
      while not ZQuery1.Eof do
    begin
      RecordCache := New(PDataRec);
      RecordCache^.ID := ZQuery1.FieldByName('GROUP_ID').AsInteger;
      RecordCache^.PID := ZQuery1.FieldByName('Parent_ID').AsInteger;
      RecordCache^.Text := ZQuery1.FieldByName('Name').AsString;
      RecordCacheList.Add(RecordCache);
      ZQuery1.Next;
    end;
    ZQuery1.Close;
    PreviousCount := RecordCacheList.Count;
    i := 0;
    While i < RecordCacheList.Count do
    begin
      If PDataRec(RecordCacheList.Items[i])^.PID = 0 then
      begin
        ANode := TreeView1.Items.AddChild(NIL,PDataRec(RecordCacheList.Items[i])^.Text);
        ANode.Data := RecordCacheList.Items[i];
        RecordCacheList.Delete(i);
      end
      else inc(i);
    end;
    While (RecordCacheList.Count > 0) and (PreviousCount <> RecordCacheList.Count) do
    begin
      i := 0;
      PreviousCount := RecordCacheList.Count;
      while i < RecordCacheList.Count do
      begin
        ANode := FindParent(TreeView1,PDataRec(RecordCacheList.Items[i])^.PID);
        if Anode <> NIL then
        begin
          ANode := TreeView1.Items.AddChild(ANode,PDataRec(RecordCacheList.Items[i])^.Text);
          ANode.Data := RecordCacheList.Items[i];
          RecordCacheList.Delete(i);
        end
        else inc(i);
      end;
    end;
    if RecordCacheList.Count > 0 then
      raise exception.Create('XXXX!');
  finally
    RecordCacheList.Free;
  end;
  Form1.Caption := Inttostr(TreeView1.Items.Count) ;
I := 0 ;
TreeView1.DoubleBuffered := true;
 
  ZQuery2.SQL.Clear ;
  ZQuery2.SQL.Text := 'Select group_kod,group_id,name from NGRP where group_id = :n';
    TreeView1.Items.BeginUpdate ;
  while i < TreeView1.Items.Count do
  begin
    begin
      ZQuery2.ParamByName('n').AsInteger := PDataRec(TreeView1.Items[i].Data)^.ID;
      ZQuery2.Open;
      While Not ZQuery2.Eof do
       begin
        New(RecordCache);
        RecordCache^.ID := ZQuery2.FieldByName('group_kod').AsInteger;
        RecordCache^.PID := 0;
        RecordCache^.Text := ZQuery2.FieldByName('group_kod').AsString +' - '+ZQuery2.FieldByName('Name').AsString;
        ANode := TreeView1.Items.AddChild(TreeView1.Items[i],RecordCache^.Text);
        ANode.Data := RecordCache;
        ANode.ImageIndex := 2;
        ANode.SelectedIndex := 3;
        ZQuery2.Next;
       end;
      ZQuery2.Close;
    end;
    inc(i);
    TreeView1.Items.EndUpdate ;
  end;
 
end;
[+][-]02/20/09 10:59 AM, ID: 23695053Accepted Solution

View this solution now by starting your 30-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

About this solution

Zone: Delphi Programming
Sign Up Now!
Solution Provided By: rllibby
Participating Experts: 3
Solution Grade: A
 
[+][-]02/20/09 09:26 AM, ID: 23694130Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]02/20/09 01:17 PM, ID: 23696326Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]02/20/09 02:04 PM, ID: 23696771Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 30-day free trial to view this Expert Comment or ask the Experts your question.

 
 
Loading Advertisement...
20091111-EE-VQP-92 - Hierarchy / EE_QW_3_20080625