asked on

Need to checksum a record before it enters a database table

Hi guys,

I have data that enters a *.dbf table. But before that I need to checksum this data if it meets a certain aritmetical formula. The data enteres the *.dbf table through a DBEdit object.

How do I do this?

Greetings,
Blash

ASKER CERTIFIED SOLUTION

Mohammed Nasman

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blash

ASKER

Thank you Mohammed.
It does the job.

Now how do I exit properly from this procedure, without
geting the error message,
with an 'exception'?

Mohammed Nasman

Hello Blash

I'm glad that work fine with you, but tell me what's the error message that you got?, could u plz tell me the error messages, and if you can post ur code to see that's wrong with it

Mohammed

blash

ASKER

Access violation at address 0045FCF2 in module 'P1NALOPR.EXE'.Read of address FFFFFFFF

blash

ASKER

unit U1zbnzpr;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, StdCtrls, Mask, DBCtrls, Db, DBTables, Grids, DBGrids,
FMXUtils;

type
TForm1 = class(TForm)
Panel1: TPanel;
Panel2: TPanel;
Panel3: TPanel;
Panel4: TPanel;
Label1: TLabel;
DBEdit1: TDBEdit;
Label2: TLabel;
DBEdit2: TDBEdit;
Label3: TLabel;
DBEdit3: TDBEdit;
Label4: TLabel;
DBEdit4: TDBEdit;
DBEdit5: TDBEdit;
Label5: TLabel;
Label6: TLabel;
Label8: TLabel;
Label9: TLabel;
DBEdit6: TDBEdit;
Label10: TLabel;
DBEdit7: TDBEdit;
Label11: TLabel;
DBEdit8: TDBEdit;
Label12: TLabel;
DBEdit9: TDBEdit;
Label13: TLabel;
DBEdit10: TDBEdit;
Label14: TLabel;
DBEdit11: TDBEdit;
Label15: TLabel;
Label16: TLabel;
Label17: TLabel;
Label18: TLabel;
StaticText1: TStaticText;
Label19: TLabel;
Label20: TLabel;
Label21: TLabel;
Label22: TLabel;
Label23: TLabel;
Label24: TLabel;
Label25: TLabel;
DBEdit16: TDBEdit;
DBEdit17: TDBEdit;
DBEdit18: TDBEdit;
DBEdit19: TDBEdit;
DBMemo1: TDBMemo;
DBMemo2: TDBMemo;
DBMemo3: TDBMemo;
DBMemo4: TDBMemo;
DBEdit20: TDBEdit;
DBEdit21: TDBEdit;
DBEdit22: TDBEdit;
DBEdit23: TDBEdit;
Label26: TLabel;
Label27: TLabel;
Label28: TLabel;
Label29: TLabel;
Label30: TLabel;
Label31: TLabel;
Label32: TLabel;
Label33: TLabel;
DBEdit24: TDBEdit;
DBEdit25: TDBEdit;
DBEdit26: TDBEdit;
DBEdit27: TDBEdit;
DBEdit28: TDBEdit;
DBEdit29: TDBEdit;
DBEdit30: TDBEdit;
DBEdit31: TDBEdit;
Image1: TImage;
DataSource1: TDataSource;
Table1: TTable;
DBGrid1: TDBGrid;
DBEdit32: TDBEdit;
Label34: TLabel;
Label35: TLabel;
Label36: TLabel;
Label37: TLabel;
Table2: TTable;
DataSource2: TDataSource;
Button1: TButton;
Database1: TDatabase;
Query1: TQuery;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Table2AfterCancel(DataSet: TDataSet);
procedure Table2AfterPost(DataSet: TDataSet);
procedure Table2BeforePost(DataSet: TDataSet);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
DBEdit9.Text := FormatDateTime('dd.mm.yyyy',Now);
FMXUtils.CopyFile('c:\windows\desktop\zbnalgl0.dbf','c:\windows\desktop\temp\');
RenameFile('c:\windows\desktop\temp\zbnalgl0.dbf', 'c:\windows\desktop\zbnalgl.dbf');
Table2.TableName:= 'zbnalgl.dbf';
Table2.Active:=True;
//

//
end;

procedure TForm1.Button1Click(Sender: TObject);
var t:ttable;
begin
Table2.Post;
Table2.Close;
//moe
Table1.Open;
Table2.Open;
//od EE
//
Table2.Edit;
DBEdit9.Text:=DateToStr(Date);
Table2.Post;
//
t := ttable.create(nil);
try
query1.open; //this query contains the sql-statement
t.databasename := query1.databasename;
t.tablename := 'c.dbf';
t.batchmove(query1,BatCopy); //this will create the table and insert the records from tableA
finally
query1.close;
t.free; //release object instance
end;
//moe
Table2.Close;
//moe2
end;

procedure TForm1.Table2AfterCancel(DataSet: TDataSet);
begin
Table2.Active:=False;
end;

procedure TForm1.Table2AfterPost(DataSet: TDataSet);
begin
Table2.Active:=False;
end;

procedure TForm1.Table2BeforePost(DataSet: TDataSet);
begin
if StrToInt(DBEdit7.Text)<50 then
begin
ShowMessage('Vrednosta mora da e pogol. od 50');
Table2.Cancel;
end;
end;

end.