Connecting to SQL Server from VB6

Posted on 2007-11-23
Medium Priority
Last Modified: 2012-05-05

I'm trying to connect to a SQL Server (2005) database from Visual Basic 6.0.  The attached code produces no errors, yet never fills the dataset.

Thanks in advance for your help.

Dim thisWorkspace As DAO.Workspace
    Set thisWorkspace = CreateWorkspace("", "admin", "", dbUseODBC)
    Dim thisConnection As DAO.Connection
    Set thisConnection = thisWorkspace.OpenConnection("", , , "ODBC;DATABASE=KnowledgeTracker;DSN=KTracker")
    Set gdbKnowledgeTracker = thisConnection.Database
    Dim rs As DAO.Recordset
    Dim sSQL As String
    sSQL = "SELECT * FROM Problems"
    Set rs = gdbKnowledgeTracker.OpenRecordset(sSQL)

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Question by:NigelRocks
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LVL 10

Assisted Solution

3_S earned 900 total points
ID: 20340368
Hello NigelRocks,

this works from VB6 to sql server 2000. I do not have MS sql 2005
Change SQLSERVER with your servername and databasename with the databasename you want to use

set thisconnection = new adodb.connection
set rs = new adodb.recordset
thisconnecton.open = "Provider=sqloledb;Network Library=DNETLIB;datasource=SQLSERVER,1433;Initial catalog=KnowledgeTracker;Trusted Connection=Yes;Encrypt=YES"
rs.activeconnection = thisconnection
rs.source = "SELECT * FROM Problems"
rs.open , , adOpenForwardOnly, adLockReadOnly
'Use your recordset
set rs = nothing
set thisConnection = nothing

Author Comment

ID: 20340526
Are you sure that what you posted is VB6 code?  My compiler choked on this:

    Dim thisConnection As Connection
    Set thisConnection = New Adodb.Connection

LVL 10

Assisted Solution

3_S earned 900 total points
ID: 20344384

but you have to add the following reference in VB6
Microsoft ActiveX Data Objects 2.8 Library
2.8 can vary depending the version of MDAC you have installed. (2.8 is default win xp)

Control the following line in you code
Dim thisConnection as ADODB.Connection

wiht databasename I mean the initial catalog, I gues in your case this is KnowledgeTracker
good luck
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LVL 66

Expert Comment

by:Jim Horn
ID: 20345605
>My compiler choked on this: ...  Set thisConnection = New Adodb.Connection

That's because DAO does not have a Connection object, only a Database object.  ADO (ADODB) has a connection object.

The code 3_S posted for you using ADO only should work for you.

Author Comment

ID: 20346224
I added the Microsoft ActiveX Data Objects 2.8 Library reference.

I got a "variable not defined" error on this line;
thisconnecton.Open = "Provider=sqloledb;Network Library=DNETLIB;datasource=SQLSERVER,1433;Initial catalog=KnowledgeTracker;Trusted Connection=Yes;Encrypt=YES"

These two lines above it define the object:
Dim thisConnection As ADODB.Connection
 Set thisConnection = New ADODB.Connection

If this code has worked for you, there must be something VERY different about our IDEs.

LVL 10

Expert Comment

ID: 20352472
Did you copy paste the line with the 'variable not defined' error
thisconnecton is not the variable you defined:  thisConnection is  (letter i is missing in you posted code)

You can check this by typing thisconnection and then the point.  If no propositions are made then you typed your variable wrong.
I would also recommend that you always add option explicit to every form/module/class you add in a project.  With this option you must declare every variable else you get compiler error to warn you.

I use VB6 with sp5
LVL 10

Expert Comment

ID: 20352481
Sorry. The i was a typo of mine in thisConnection

Author Comment

ID: 20352572
Yes, it was a typo.

I also got an error on:

thisConnection.Open = "  "

It has to be

thisConnection.Open(" ")

I'll get back to you about what happens.
LVL 66

Expert Comment

by:Jim Horn
ID: 20352591
{very wild guess}

Lose the = sign

thisconnecton.open "Provider=sqloledb;Network Library=DNETLIB;datasource=SQLSERVER,1433;Initial catalog=KnowledgeTracker;Trusted Connection=Yes;Encrypt=YES"

Author Comment

ID: 20352609
It doesn't like this line:

thisConnection.Open ("Provider=sqloledb;Network Library=DNETLIB;datasource=SQLSERVER,1433;Initial catalog=KnowledgeTracker;Trusted Connection=Yes;Encrypt=YES")

Where in the above string would I tell it what server to use?

LVL 66

Accepted Solution

Jim Horn earned 600 total points
ID: 20352635
http://www.connectionstrings.com is an excellent resource for peicing together connection strings.

{another wild guess, I'm on a roll....}

Lose the parentheses as well, as they imply that you are trying to return a value/reference.

thisConnection.Open "Provider=sqloledb;Network Library=DNETLIB;datasource=SQLSERVER,1433;Initial catalog=KnowledgeTracker;Trusted Connection=Yes;Encrypt=YES"

Author Comment

ID: 20353011
This is the string that did it:

thisConnection.Open "Driver={SQL Server};Server=COPS14\COPSDEV;Database=KnowledgeTracker;Trusted_Connection=Yes;"

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