Solved

Need to checksum a record before it enters a database table

Posted on 2001-06-15
5
249 Views
Last Modified: 2010-04-06
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
0
Comment
Question by:blash
  • 3
  • 2
5 Comments
 
LVL 22

Accepted Solution

by:
Mohammed Nasman earned 50 total points
ID: 6194791
Hi Blash

  you can check about ur value in the even before post, and if the value not as you want to save you can cancel the operation

procedure TForm1.Table1BeforePost(DataSet: TDataSet);
begin
  If StrToInt(DBEdit2.Text) < 50 then
  begin
    ShowMessage('Value must be greeter than 50');
    Table1.Cancel;
  end;
end;

Best regards
Mohammed Nasman

 
0
 

Author Comment

by:blash
ID: 6201310
Thank you Mohammed.
It does the job.

Now how do I exit properly from this procedure, without
geting the error message,
with an 'exception'?
0
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 6201870
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
0
 

Author Comment

by:blash
ID: 6201948
Access violation at address 0045FCF2 in module 'P1NALOPR.EXE'.Read of address FFFFFFFF
0
 

Author Comment

by:blash
ID: 6202035
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.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
delphi prevent click fast 2 219
Connection between libmysql.dll and MySQL Versions 7 99
LAN or WAN ? 11 91
Graphics32 under Delphi 10.1 Berlin 2 66
The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question