unit1.pas

万能查询控件WNQuery2.0(带源码),Delphi+ADO功能强大.

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, Grids, DBGrids, ADODB, WNADOCQuery;

type
  TForm1 = class(TForm)
    w: TWNADOCQuery;
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    Button1: TButton;
    ADOQuery1: TADOQuery;
    Button2: TButton;
    W1: TWNADOCQuery;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  qstr: string;
begin
  if w.Execute(true) then
  begin
    qstr := 'select * from tab where ' + w.QUeryTerm;
    showmessage(qstr);
    with ADOQuery1 do
    begin
      Close;
      SQL.Text := Qstr;
      Open;
    end;
  end;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  w.ConnectionString := 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=' + ExtractFileDir(Application.ExeName) + '\qq.mdb;Persist Security Info=False';
  ADOQuery1.ConnectionString := w.ConnectionString;
  w1.ConnectionString := w.ConnectionString;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  qstr: string;
begin
  if w.Execute(False) then
  begin
    qstr := 'select * from tab where ' + w.QUeryTerm;
    showmessage(qstr);
    with ADOQuery1 do
    begin
      Close;
      SQL.Text := Qstr;
      Open;
    end;
  end;
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  qstr: string;
begin
  if w1.Execute(true) then
  begin
    qstr := 'select * from tab where ' + w.QUeryTerm;
    showmessage(qstr);
    with ADOQuery1 do
    begin
      Close;
      SQL.Text := Qstr;
      Open;
    end;
  end;
end;

end.