Solved

Paradox table not refreshing

Posted on 2003-11-10
2
214 Views
Last Modified: 2012-05-04
I have a Delphi 5 application accessing a paradox dataabase. The database is on a server. I want to get the next invoice number from a table and then incrament it number by one. The application works fine on a single machine but when I try to access the the next number from a different machine the paradox table has not been updates. It is only updatede when the application is turned off. I am using the following sql

insert into invoiceno
  (InvoiceNo)
values
  (:InvoiceNo)  

select max(InvoiceNo) as newNumber from InvoiceNo

Is there a reason why the table does not update across the network. I have cached updates set to false

Thanks
0
Comment
Question by:fisace
2 Comments
 
LVL 27

Assisted Solution

by:kretzschmar
kretzschmar earned 200 total points
ID: 9714419
>It is only updatede when the application is turned off. I am using
>the following sql

usually caused by misconfigured bde-settings

checks
- netdirpath
  - pointed to a shared directory (read/write access rights)
  - this entry must be char by char the same on all clients

- databasepath (where the tables resides)
  - this entry must be char by char the same on all clients
    (also the driveletter must be the same on all clients)

- local share
    - if above not helps after check and maybe readjustment,
      try the opposite value of this parameter

hope this helps

meikl ;-)  

0
 
LVL 17

Accepted Solution

by:
geobul earned 300 total points
ID: 9714489
Hi,

In a multiuser environment I suggest you to create a new table with one record only (and perhaps one field) containing the last given invoice number. Then your application should use a transaction for getting the next number this way:

var InvoiceNo: integer;
begin
...
Database1.StartTransaction;
try
  // get current number
  Query1.Close;
  Query1.SQL.Text := 'SELECT InvoiceNum FROM Table2'; // Table2 is that table
  Query1.Open;
  InvoiceNo := Query1.Field[0].AsInteger;
  Query1.Close;
  // increment the number
  Inc(InvoiceNo);
  // save the new number
  Query1.SQL.Text := 'UPDATE Table2 SET InvoiceNum = ' + IntToStr(InvoiceNo);
  Query1.ExecSQL;
  // do your insert here - insert new record in the invoice table with InvoiceNo
  // ...
  Database1.Commit;
except
  Database1.Rollback;
end;

Regards, Geo
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Delivering innovative fully-managed cloud services for mission-critical applications requires expertise in multiple areas plus vision and commitment. Meet a few of the people behind the quality services of Concerto.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

930 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now