delphi学习treeview中从表列名和数据添加为目录并双击自动选中

Posted 2020-09-16 delphi学习交流吧

 1 unit Unit2;
  2 
  3 interface
  4 
  5 uses
  6   Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  7   Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Data.DB, Data.Win.ADODB, Vcl.Grids,
  8   Vcl.DBGrids, Vcl.ComCtrls, Vcl.StdCtrls;
  9 
 10 type
 11   TForm2 = class(TForm)
 12     TreeView1: TTreeView;
 13     DBGrid1: TDBGrid;
 14     ADOConnection1: TADOConnection;
 15     ADOQuery1: TADOQuery;
 16     DataSource1: TDataSource;
 17     procedure FormShow(Sender: TObject);
 18     procedure TreeView1DblClick(Sender: TObject);
 19   private
 20     { Private declarations }
 21   public
 22     { Public declarations }
 23   end;
 24 
 25 var
 26   Form2: TForm2;
 27 
 28 implementation
 29 
 30 {$R *.dfm}
 31 
 32 procedure TForm2.FormShow(Sender: TObject);
 33 var
 34   I: Integer;
 35   node: TTreeNode;
 36   MyFuAdq,MyZiAdq: TADOQuery;
 37 begin
 38   MyFuAdq := TADOQuery.Create(nil);
 39   MyZiAdq := TADOQuery.Create(nil);
 40   try
 41     MyFuAdq.Connection := ADOConnection1;
 42     MyZiAdq.Connection := ADOConnection1;
 43     with MyFuAdq do
 44     begin
 45       SQL.Text := \'SELECT TOP 1 * FROM top_order\';
 46       Open;
 47     end;
 48 
 49     for I := 0 to MyFuAdq.FieldDefs.Count - 1 do
 50     begin
 51       node := TreeView1.Items.Add(nil, MyFuAdq.FieldDefs[I].Name); {字段名}
 52 
 53       //再次查询每列不同的数据
 54       with MyZiAdq do
 55       begin
 56         Close;
 57         SQL.Text := \'SELECT DISTINCT \'+MyFuAdq.FieldDefs[I].Name+ \' FROM top_order\';
 58         Open;
 59       end;
 60       while not MyZiAdq.Eof do
 61       begin
 62         TreeView1.Items.AddChild(node, MyZiAdq.FieldByName(MyFuAdq.FieldDefs[I].Name).AsString);
 63         MyZiAdq.Next;
 64       end;
 65     end;
 66 
 67 
 68   finally
 69     MyFuAdq.Free;
 70     MyZiAdq.Free;
 71   end;
 72 
 73 end;
 74 
 75 procedure TForm2.TreeView1DblClick(Sender: TObject);
 76 var
 77   MyAdq: TADOQuery;
 78   selectName,selectValue: string;
 79 begin
 80   MyAdq := TADOQuery.Create(nil);
 81   try
 82     MyAdq.Connection := ADOConnection1;
 83 
 84     //获取选中的内容
 85     selectName := TreeView1.Selected.Parent.Text;
 86     selectValue := TreeView1.Selected.Text;
 87 
 88     //选中
 89     with MyAdq do
 90     begin
 91       SQL.Text := \'UPDATE top_trade SET top_xuanzhong = 1 WHERE top_xuhao IN (SELECT DISTINCT top_xuhao FROM top_order WHERE \'+selectName+\' = \'+selectValue.QuotedString+\')\';
 92       ExecSQL;
 93     end;
 94 
 95 
 96     //查询
 97     with ADOQuery1 do
 98     begin
 99       Close;
100       SQL.Text := \'SELECT top_order.top_title,top_trade.top_xuhao,top_trade.top_xuanzhong FROM top_order FULL JOIN top_trade ON top_order.top_xuhao = top_trade.top_xuhao WHERE top_order.\'+selectName+\' = \'+selectValue.QuotedString;
101       Open;
102     end;
103   finally
104     MyAdq.Free;
105   end;
106 end;
107 
108 end.