u_litest.~pas

ListBox的一个基本操作,将ListBox2的内容添加到ListBox1里面的一个简单的操作,希望对一些新手有帮助.

unit U_litest;

interface

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

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    ListBox2: TListBox;
    Button1: TButton;
    Button2: TButton;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    Label1: TLabel;
    procedure FormShow(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormShow(Sender: TObject);
begin
 try
  adoquery1.SQL.Clear ;
  adoquery1.Close;
  adoquery1.SQL.Add('select * from na1 order by na1');
  adoquery1.Open;
  listbox2.Clear;
while not adoquery1.Eof do
  begin
  listbox2.Items.Add(adoquery1.FieldValues['na1']);
  adoquery1.Next;
  end;
  finally
   adoquery1.Close;
  end;
 try
  adoquery1.SQL.Clear ;
  adoquery1.Close;
  adoquery1.SQL.Add('select * from na2 order by na2');
  adoquery1.Open;
  listbox1.Clear;
while not adoquery1.Eof do
  begin
  listbox1.Items.Add(adoquery1.FieldValues['na2']);
  adoquery1.Next;
  end;
  finally
    adoquery1.Close;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
 var
  strkc,strsql:string;
  i:integer;
begin
  if listbox2.ItemIndex =-1 then
    begin
     showmessage('请先选定要添加的记录');
     listbox2.SetFocus;
     exit;
    end;
   strkc:=listbox2.Items[listbox2.ItemIndex] ;
for i:=0 to listbox1.Items.Count -1 do
   begin
    if strkc=listbox1.Items[i] then
    begin
    showmessage('已有此记录');
    exit;
    end;
  end;
   strsql:='insert into na2(na2) values('''+strkc+''')';
  try
   adoquery1.SQL.Clear ;
   adoquery1.Close;
   adoquery1.SQL.Add(strsql);
   adoquery1.ExecSQL;
   listbox1.Items.Add(strkc) ;
  except
 end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
strkc,strsql:string;
begin
 if listbox1.ItemIndex =-1 then
   begin
    showmessage('请先选定要移除的记录');
    listbox1.SetFocus;
    exit;
   end;
    strkc:=listbox1.Items[listbox1.ItemIndex] ;
    strsql:='delete from na2 where  na2='''+strkc+''' ';
   try
    adoquery1.SQL.Clear ;
    adoquery1.Close;
    adoquery1.SQL.Add(strsql);
    adoquery1.ExecSQL;
    listbox1.Items.Delete(listbox1.ItemIndex);
  except
  end;
end;

end.