Re: Vb 6 and access 2000 in LAN - Visual Basic Discussion Boards

arunendra wrote:
1.How to configure the machine

Access is NOT a good shareable database. It was meant to be a Desktop database. It'll work, but you have to maintain (compact and repair) that database religously! Also, maintenance on the database will take it offline until the maintenance is complete. This means that your application cannot run until your done!

This depends on your machine environment. I highly recommend reading up on Windows networking and security first. But, the basic thing is to setup a Share on the server and put your database files on that share. Then, each workstation has to map a drive to that Share. Excatly how this is done depends on if your machines are in a workgroup or domain. How you setup the Share and NTFS security also depends on this configuration.

arunendra wrote:
2.I have used file dsn for crystal report

I don't use Crystal Reports, so I couldn't tell you...

arunendra wrote:
3.what will be the ado conect string for the clients to connect to the database in the lan?

The same as what your using now. Only you'll have to specify the network drive letter you mapped setting up Windows networking, and specify the full path to the .MDB file.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Thanks Dave for your reply.
I know Access is not for sharing but the requirement is such that i have to use access. I have a code , therefore, in my application which will automatically run the compact database service everyday at a specific time.
I actually need the code to perform what I need. for eg, if the folder in which the database resides is called "x', and the name of the mdb file is "data.mdb", then, how do I make sure that users can open from other locations,
i have set read & execute,list folder contents,read, write permission for everyone and also have set the same permission for the mdb file. have i done something wrong?

also i have tried the following code for connecting from the client :

Connect_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\machine_name\x\data.mdb;Persist Security Info=False;Jet OLEDB:Database Password=bill1234"
con.open connect_string

but when run from another machine i get the following error msg :
( not exact!!) "the \\machine_name\x\data.mdb can not be opened as this may be not permitted or exclusively locked"

Regarding the crystal report problem, i think i need to know only one thing, i.e. how to share the file dsn that i have used for the crystal report. to be specific, how should i configure the file dsn that i already have in the machine where i have the database, i think that will make the reports available in the client machines. so, can you help me for sharing the file dsn in proper manner.

Regadrs
Arunendra

N.B. I will soon want to learn how to connect to a sql server database in a workgroup and also in a domain, i think you can help me out in that also, but currently please get me out of this.

-- modified at 11:16 Friday 14th April, 2006

arunendra wrote:
if the folder in which the database resides is called "x', and the name of the mdb file is "data.mdb", then, how do I make sure that users can open from other locations,

Have you setup a share on folder X?? A UNC path takes the format \\machineName\shareName\folder\filename. In your case, if you create a Share on folder X and called that share "Data", then the UNC path would be \\machine_name\Data\mydata.mdb.

As for the FileDSN, the default location for the file is C:\Program Files\Common Files\ODBC\Data Sources. I would suggest copying the FileDSN to that folder on each client machine.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Thanks again for such a quick reply.
First of all what is UNC? I have given permission a set of permission to that folder (x) and the mbd (data) which i have given in the earlier letter.
Mostly i have given all the permissions except for the full control. do u think it will be sufficient?

second, regarding file dsn, will this problem solve, if i just copy the actual dsn (say mydsn.dsn) file and paste them in each location ( the location you have given)? Or may I try using the odbc manager in each pc and just add the dsn from the remote pc? what should i do?

Regards
arunendra

arunendra wrote:
First of all what is UNC?

UNC stands for Universal Naming Convention. If you sis not create a SHARE, which you have never mentioned you did, then the security setup won't make a difference. You MUST MUMST MUST MUST create a SHARE on the X folder. Right click the X folder, click on "Sharing...", then click on "Share this folder". Give the share a name...

Yes, you can copy the FileDSN file over to the client workstations and it'll work.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Thanks Dave.
I am out of my setup and so couldnt try it, but I will follow your instructions and will report it back.
In the mean while, can you help me in a very different subject, as I found this to be amazing, I never thought I will find someone who will answer my questions, and so I am bursting with all the queries, I am sorry for that , but i am trying my best to filter them and send you something that is absolutely impossible for me to do.
I have a code for compacting which uses jet engine,(there was a code which was working fine but was in DAO, and I found some errors occuring in my project and also in the crystal report, so i thought of going on with ado only), the code if changed a little works fine, i dont remeber what changes i had done but it can't put the password back to the newly created mdb file, so i am sending the original code i got , please see what I have to do.
''''''''''''''''''''' the code '''''''''''''''''''''''''''''''''''''
Public Function CompactAndRepairDB(sSource As String, _
sDestination As String, _
Optional sSecurity As String, _
Optional sUser As String = "Admin", _
Optional sPassword As String, _
Optional lDestinationVersion As Long) As Boolean

Dim sCompactPart1 As String
Dim sCompactPart2 As String
Dim oJet As JRO.JetEngine

' Put together the provider string for the source database
sCompactPart1 = "Provider=Microsoft.Jet.OLEDB.4.0" & _
";Data Source=" & sSource & _
";User Id=" & sUser & _
";Password=" & sPassword

' If the database has a user-level security file, add the
' details
If sSecurity <> "" Then
sCompactPart1 = sCompactPart1 & _
";Jet OLEDB:System database=" & sSecurity & ";"
' Else
' sCompactPart1 = sCompactPart1 & _
' ";Jet OLEDB:System database=false ;"
End If

' Put together the provider string for the destination
' database
sCompactPart2 = "Provider=Microsoft.Jet.OLEDB.4.0" & _
";Data Source=" & sDestination & ";Persist Security Info=False;Jet OLEDB:Database Password=bill1234"

' The destination database will end up in the latest version
' of jet, unless a specific version has been requested;
' 1 = Jet 1.0, 2 = Jet 1.1, 3 = Jet 2.x, 4 = Jet 3.x,
' 5 = Jet 4.x etc
If lDestinationVersion <> 0 Then
sCompactPart2 = sCompactPart2 & _
";Jet OLEDB:Engine Type=" & lDestinationVersion
End If

' Compact and repair the database
Set oJet = New JRO.JetEngine
oJet.CompactDatabase sCompactPart1, sCompactPart2
Set oJet = Nothing

CompactAndRepairDB = True
End Function

this code produces the following error number :-2147217843
and the following error msg :
"Cannot start your application. The workgroup information file is missing or opened exclusively by another user."
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Regards
arunendra

First, the database cannot be opened by ANYTHING. Not one of your client machines, not Access, ... NOTHING can have the database open already.

Second, if there is a workgroup file for the database, it has to be in the same folder as the .MDB file.

Next, we'll just simplify your code a bit:

' sSrcPath is the source database file path
' sDstPath is the source database file path
' sUser is the username to use to login to the source database
' sPassword is the sUser's password
' sSystemPassword is the Database Password to use to login to the source
'                 and reset in the destination databases

Public Function CompactAndRepairDB( _
        sSrcPath As String, _
        sDstPath As String, _
        Optional sUser As String = "Admin", _
        Optional sPassword As String, _
        Optional sSystemPassword As String) _
            As Boolean
 
    Dim srcConn As String
    srcConn = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};User Id={1};Password={2};Jet OLEDB:Database Password={3}", sSource, sUser, sPassword, sSystemPassword)
 
    Dim dstConn As String
    dstConn = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Jet OLEDB:Engine Type=5;Jet OLEDB:Database Password={1}", sDestination, sSystemPassword)
 
    Dim JRO As New JRO.JetEngine
    JRO.CompactDatabase(srcConn, dstConn)
 
    Return True
End Function

If you wanted to use this in more applications, I'd rewrite it to be more flexible. Right now, it'll only work on databases that have a Database Password set.

Oh!! Don't forget to rename the source database to a temp name and rename the destination database back to the same name as the original source!!

Dave Kreskowiak
Microsoft MVP - Visual Basic

Thanks dave!
But in the code you sent string.format part is showing a compile error and the error says : "expected ("
is it problem in my vb? do i have to do something to rectify this error?

and also, i want everyone to open the database, ofcourse through the software so that they can insert/update/delete/select records. for that i have used following code for opening the connection :
connect_string is string type data
Connect_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\Flexnet\TECHNOPACK\technopack.mdb;Persist Security Info=False;Jet OLEDB:Database Password=bill1234"
con.execute str

and for selecting data i have used :
dim str as string
str="
str="select * from Stock"
set rec=nothing
rec.Open str, Con, adOpenStatic, adLockOptimistic, adCmdText

and for any update/delete/insert i have first built the string and then
simply executed the statement by con.execute str where con is the adodb connection.

for that machine where the database will reside i have used the following
string :
'con is the adodb connection
Connect_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & app.path & "\TECHNOPACK\technopack.mdb;Persist Security Info=False;Jet OLEDB:Database Password=bill1234"
con.execute str

Have i done something wrong? Please note that i want every pc to have the same right, so that everyone can use the database. and for the compacting the database i will provide that option only in the machine where the database will reside.
and also if possible please send the compacting code you were talking about.
Regadrs
Arunendra

-- modified at 12:11 Saturday 15th April, 2006
N.B. just now i have found something!! the code for the client doesnt run until i get into that particular machine where the database stored with a user id and password, so my question is can i integrate that machine user id and password in my code? i tried to get into the machine with the following command from the run -> \\machine_name; it asked for user id and password, i gave them and then the shared resources appeared. then i tried to open the exe and the exe worked!! so is my question! am i right?? and can this be a way of connecting in the workgroup for running my software?

arunendra wrote:
But in the code you sent string.format part is showing a compile error and the error says : "expected (". Is it problem in my vb? do i have to do something to rectify this error?

I forgot, you're using VB6. The code I posted is for VB.NET. Here's the VB6 translated portions:

    Dim srcConn As String
    srcConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & sSource & _
        ";User Id=" & sUser & _
        ";Password=" & sPassword & _
        ";Jet OLEDB:Database Password=" & sSystemPassword
 
    Dim dstConn As String
    dstConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & sDestination & _
        ";Jet OLEDB:Engine Type=5" & _
        ";Jet OLEDB:Database Password=" & sSystemPassword

arunendra wrote:
N.B. just now i have found something!! the code for the client doesnt run until i get into that particular machine where the database stored with a user id and password, so my question is can i integrate that machine user id and password in my code?

Can it be put into the code? Yes. Is it a good idea?? HELL NO!! Don't even think of doing this!

Map a drive letter to the network share before you try to launch the .EXE. The process of mapping the drive will ask for the users name and password, adding a FAR MORE MANAGEABLE layer of security to your application. If you put it in your code, your code can then NOT be transfered to another environment, being explicitly tied to this exact network setup. Not a good idea...

Then, in your connection string, supply the full path to the database file using the drive letter that was mapped, i.e.: F:\Technopack.mdb.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Thanks Dave for your continuous support!
1.for the first part (comapcting), the string (source) now looks like the following when it is passed to the function:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=;User Id=Admin;password= ;Jet OLEDB:Database Password=bill1234
is the formation right?

2. the part : oJet.CompactDatabase(srcConn, dstConn), gives a compiler error
"expected:="; if i remove the brackets, there is no error, will it work?

3. if i try like that (with out bracket and with the string formed above, and when run,when the compactdatabase part comes, the error msg occures :
"object variable or with block variable not set"
what shall i do?

for the second part, can you build a complete connect string, for eg if the machine where the database is present is called "machine one", and the database mdb file is in the d drive of that machine (d:\datafolder\data.mdb), and if that folder is shared as "datafolder_shared", with the permission of "modify/read/execute and write" for a group of users and full control for the administrators, then what should be the string to connect from another machine :
should it be something like the following :

Connect_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\machine one\datafolder_shared\data.mdb;Persist Security Info=False;Jet OLEDB:Database Password=bill1234"

or

Connect_String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\machine one\datafolder_shared:\data.mdb;Persist Security Info=False;Jet OLEDB:Database Password=bill1234"

or something else?
you want me to map a drive, but how to do and in which machine i have to do? i have so, given the full situation, plz tell me a bit more. I am sorry as i dont know much of computer administration, so i give you some trouble, i hope you will pull me out of this.
Regards
Arunendra

arunendra wrote:
1.for the first part (comapcting), the string (source) now looks like the following when it is passed to the function:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=;User Id=Admin;password= ;Jet OLEDB:Database Password=bill1234
is the formation right?

Nope. You didn't supply a path to the database you want to compact. Notice that Data Source doesn't have anything after it?

arunendra wrote:
2. the part : oJet.CompactDatabase(srcConn, dstConn), gives a compiler error
"expected:="; if i remove the brackets, there is no error, will it work?

Remove the paranthesis and it'll work. It's been about 6 years since I've used VB6. I forgot, if your don't use the return value, you don't supply paranthesis around the arguments your passing to the function.

arunendra wrote:
3. if i try like that (with out bracket and with the string formed above, and when run,when the compactdatabase part comes, the error msg occures :
"object variable or with block variable not set"
what shall i do?

Because you didn't supply the Data Source parameter in question 1. How is it supposed to know which database to compact if that Data Source is blank???

arunendra wrote:
you want me to map a drive, but how to do and in which machine i have to do?

This is why I told you to read up on Windows networking before you tried this! You have to map a drive before you launch this application. This is done through login scripts or you can setup a persistant drive mapping on each client workstation, or map the drive using a batch file before the app is launched, ...

Dave Kreskowiak
Microsoft MVP - Visual Basic

Dear Dave!
Thanks for the help.

Now the source string looks like :
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\TECHNOPACK\technopack.mdb;User Id=Admin;password=;Jet OLEDB:Database Password=bill1234

and the destination string is like the following :
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\TECHNOPACK\tmptechnopack.mdb;Jet OLEDB:Engine Type=5;Jet OLEDB:Database Password=bill1234

The error was still on and after a little bit of searching i found that in my declaration of jro jetengine ,new keyword was missing, now the problem of compacting is over!!! Thanks!

For windows netwroking, can you give me any good location address from where I can get more about that.
I have also found that, if I try with permissions for "Everyone" (permissions to read,list,write and execute) my problem would be solved. Do you think it's a good idea?
furthermore, I dont see any user with this name or any group, but this word does work! can you explain a bit!
Regards
arunendra
N.B another thing! do you mind if I ask something else under this subject line. if yes then only i will ask.
thanks again for the help.
-- modified at 6:19 Monday 17th April, 2006

arunendra wrote:
I have also found that, if I try with permissions for "Everyone" (permissions to read,list,write and execute) my problem would be solved. Do you think it's a good idea?

Not really... Home and Small Office Networking with Windows XP[^]

arunendra wrote:
furthermore, I dont see any user with this name or any group, but this word does work! can you explain a bit!

What do you think "Everyone" means? It doesn't care what the username is, authenticated or otherwise.

arunendra wrote:
N.B another thing! do you mind if I ask something else under this subject line. if yes then only i will ask.

New line of questions = new post.

Dave Kreskowiak
Microsoft MVP - Visual Basic

how can i make program that will login in hotmail acount and take all email address in this email

--------------------

in othere words i have web site that have username as email and password

i want to program to test login to this account and all email address in this account

to send advertisment to this email

how can i do that ??

Palestine

Please don't cross post.

---
b { font-weight: normal; }

Do you really think we're going to tell you how to do something illegal?

Dave Kreskowiak
Microsoft MVP - Visual Basic

when i upload my webpages on server its giving error:

Server Error in '/' Application.
--------------------------------------------------------------------------------

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".



Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.



after changing the web.config file....
<customErrors mode="Off"/>
its giving the same error.

how can i make my login page as a indexpage.
its urgent plz

Turn customErrors to On so you will se what error you get and then you will be able to fix it.

And we don't care if it is urgent so don't bother writing that.

--------------------------------------------------------
My development blog
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!

i have an application developed in vb.net and msaccess during deployment i m facing following two problems
1.i want that my application is automatically run after installation plz tell me how it will?
2. when i make a shortcut of my application at user's desktop and program menu it opens the same location not call the exefile of the project.?
thnx in advance
plz reply me urgent my development is just hang due to these problems

plz reply me soon

naeeemkhan wrote:
2. when i make a shortcut of my application at user's desktop and program menu it opens the same location not call the exefile of the project.?

http://support.microsoft.com/kb/821766/en-us[^]

naeeemkhan wrote:
1.i want that my application is automatically run after installation plz tell me how it will?

I think you might need to use installshield.

can you be abit more specific and can you give some more details, i think it will then be easy to understand your problem

Try to spend some of your time to research with this website[^]. I hope you could find what you need with this software.

naeeemkhan wrote:
1.i want that my application is automatically run after installation plz tell me how it will?

Well, you could create a custom action for your installation project that ASKS first if the user wants to run the app after the install. Then, if so, just use the Process[^] class to launch it.

Docs[^] on custom actions...

naeeemkhan wrote:
2. when i make a shortcut of my application at user's desktop and program menu it opens the same location not call the exefile of the project?

Huh?? Are you saying that the shortcut you put into the install just opens the location of the .EXE?? Modify the shortcut in your installation and add the name of the .EXE to the path.

Dave Kreskowiak
Microsoft MVP - Visual Basic

-- modified at 10:56 Friday 14th April, 2006

hi guys i want the logic basically i am making a date sheet of university in vb. here i have date and four time slots against one date and correspondig their room allocation with couse please give me the logic how can i complete this task. with collection or three dimension array.

Regards
Msaqlain

First, you're going to have to show us that you actually attempted to do something on this homework assignment. We're not here to do your homework for you, just push you in the right direction.

Dave Kreskowiak
Microsoft MVP - Visual Basic