Italian community of Lazarus and Free Pascal

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, db, FileUtil, ZConnection, ZDataset, Forms, Controls,
  Graphics, Dialogs, DBGrids, DbCtrls, StdCtrls;

type

  { TForm1 }

  TForm1 = class(TForm)
    Button1: TButton;
    DataSource1: TDataSource;
    DBEdit1: TDBEdit;
    DBGrid1: TDBGrid;
    DBMemo1: TDBMemo;
    DBNavigator1: TDBNavigator;
    DBText1: TDBText;
    ZConnection1: TZConnection;
    ZQuery1: TZQuery;
    Q_Inserimento: TZQuery;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    function GetLastId(): integer;
  private
    { private declarations }
  public
    { public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.Button1Click(Sender: TObject);
var
   LastId: integer;
begin
     LastId:=Self.GetLastId()+1;
     Self.Q_Inserimento.SQL.Text:='INSERT INTO utenti(Id, Cognome,Nome,Citta)VALUES(' + IntToStr(LastId) + ',''Cognome' + IntToStr(LastId) + ''',''Nome' + IntToStr(LastId) + ''',''Città' + IntToStr(LastId) + ''');';
     Self.Q_Inserimento.ExecSQL;
     Self.ZQuery1.Refresh;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
     //svuoto la tabella
     Self.Q_Inserimento.SQL.Text:='DELETE FROM utenti;';
     Self.Q_Inserimento.ExecSQL;
     Self.ZQuery1.Refresh;
end;

function TForm1.GetLastId(): integer;
var
   ret: integer;
begin
     ret:=0;
     Self.Q_Inserimento.SQL.Text:='select Id as MaxId from utenti group by Id order by Id desc;';
     Self.Q_Inserimento.Open;
     if not Self.Q_Inserimento.EOF then
     begin
          Self.Q_Inserimento.First;
          ret:=Self.Q_Inserimento.FieldByName('MaxId').AsInteger;
     end;
     Self.Q_Inserimento.Close;
     result:=ret;
end;

end.

procedure TForm1.FormCreate(Sender: TObject);
begin
     //svuoto la tabella
     Self.Q_Inserimento.SQL.Text:='DELETE FROM utenti;';
     Self.Q_Inserimento.ExecSQL;
     Self.ZQuery1.Refresh;
end;

function TForm1.GetLastId(): integer;
var
   ret: integer;
begin
     ret:=0;
     Self.Q_Inserimento.SQL.Text:='select Id as MaxId from utenti group by Id order by Id desc;';
     Self.Q_Inserimento.Open;
     if not Self.Q_Inserimento.EOF then
     begin
          Self.Q_Inserimento.First;
          ret:=Self.Q_Inserimento.FieldByName('MaxId').AsInteger;
     end;
     Self.Q_Inserimento.Close;
     result:=ret;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
   LastId: integer;
begin
     LastId:=Self.GetLastId()+1;
     Self.Q_Inserimento.SQL.Text:='INSERT INTO utenti(Id, Cognome,Nome,Citta)VALUES(' + IntToStr(LastId) + ',''Cognome' + IntToStr(LastId) + ''',''Nome' + IntToStr(LastId) + ''',''Città' + IntToStr(LastId) + ''');';
     Self.Q_Inserimento.ExecSQL;
     Self.ZQuery1.Refresh;
end;