unit1.pas

用firebird制作嵌入式数据库

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, DBGrids, DB, DBClient, SimpleDS, SqlExpr,
  DBXpress;

type
  TForm1 = class(TForm)
    SQLConnection1: TSQLConnection;
    SimpleDataSet1: TSimpleDataSet;
    datasource1: TDataSource;
    btnConnect: TButton;
    btnCommit: TButton;
    btnQuery: TButton;
    DBGrid1: TDBGrid;
    lbl1: TLabel;
    procedure btnConnectClick(Sender: TObject);
    procedure btnQueryClick(Sender: TObject);
    procedure btnCommitClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnConnectClick(Sender: TObject);
begin
  if SQLConnection1.Connected=true then
    SQLConnection1.Connected:=false;
  SQLConnection1.Params.Clear;
  SQLConnection1.Params.Values['user_name']:='sysdba';
  SQLConnection1.Params.values['password']:='masterkey';
  sqlConnection1.Params.Values['SQLDialect']:='3';
  SQLConnection1.Params.Values['database']:=extractfilepath(paramstr(0))+'data\demo.fdb';
  SQLConnection1.Connected:=true;
  showmessage('连接成功');
end;

procedure TForm1.btnQueryClick(Sender: TObject);
begin
  if not sqlConnection1.Connected then
  begin
    showmessage('请先连接');
    exit;
  end;
    
  SimpleDataSet1.DataSet.CommandText:='select * from STUDENT';
  simpleDataSet1.Open;
end;

procedure TForm1.btnCommitClick(Sender: TObject);
begin
  if simpleDataSet1.ApplyUpdates(-1)>0 then
    showmessage('提交数据不成功!')
  else
    showmessage('提交数据成功!');
end;

end.