Solved

Borland BDE & NetDir

Posted on 1997-03-26
4
474 Views
Last Modified: 2012-05-04
I have 2 computers on a Windows '95 (peer to peer) network.

The paradox tables are stored on computer 1 and computer 2 accesses the data from this computer.
The NetDir on computer 1 points to 'C:\' and the NetDir on computer 2 points to 'T:\' which is a mapping of computer 1 'C:\'.

I have created an alias 'ARROW' pointing to this directory on both computers.

The problem is when I update a record on one computer I can't see the change until I exit out completely from the application I have written in Delphi and then come back in.
Also there is no record locking etc.

Regards
Eric Kay
0
Comment
Question by:Eric Kay
4 Comments
 
LVL 3

Expert Comment

by:sperling
ID: 1335004
You should always make sure that the mappings are equal seen from all machines.

Use
  Subst T: C:\
in autoexec.bat on one, map T: to C:\ on the other.

This is, in my opinion, a flaw in the design of Paradox, but I guess we'll have to live with it...


Regards,

Erik.
0
 

Author Comment

by:Eric Kay
ID: 1335005
Still doesn't work. I found that you need to set LOCAL SHARE to true on each computer on the Peer to Peer network.  The reason is that dedicated servers notify clients of record/file locking wheras on a Peer to Peer network this functionality is not present.
0
 

Accepted Solution

by:
gdj earned 100 total points
ID: 1335006
The easiest way to deal with multi-user that I have found.  It has the main advantage of ease of distribution.

Don't use an Alias.  for example you are storing the data on computer 1in the directory   C:\MYPROG\DATA

At runtime read an ini (or registry) location for these datafiles.  Also create a setup program to write the ini file.

var
  DataFiles : String

DataFiles := ReadFromINI {ie on computer 1 read in C:\MYPROG\DATA\    on computer 2 you read in T:\MYPROG\DATA\   }
Session.NetDir := DataFiles;
Table1.DatabaseName := Datafiles;
Table1.TableName := 'Customer.db"
try
  Table1.Active := True;
...


This creates the .net file in the data directory.  Because both computer already have to point to the same location for the data, you might alwell use the same location to point to the .net file.

Local Share MUST be set to true on all computers (BDE32CFG)

Paradox sharing only works if the program in written in the same version of Delphi.

If all else fails run the BDE on both computers.  If that works you know its a problem with your code, not the BDE configuration.
0
 
LVL 1

Expert Comment

by:jackb022197
ID: 1335007
I ran into similar problems: Make sure that the path for both NetDir's is identical (incl. drive letter).
These paths are stored in de *.net and/or *.lck files created by the BDE. If the paths are not identical, record locking will not work as it should.
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

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…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

911 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

15 Experts available now in Live!

Get 1:1 Help Now