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would like to connect to an mdb file using DSN only

Posted on 2001-08-08
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Last Modified: 2006-11-17
hello everyone,
i have a database e:\user\sample.mdb,
i want to interact with this mdb thru adodb using
DSN <b>connection only</b>.

some people gave some codes but those were not working fine.

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Question by:karthikdd
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13 Comments
 
LVL 43

Expert Comment

by:TimCottee
ID: 6363917
Assuming you have the DSN set up correctly all you should need to do is this:

Dim cnn As ADODB.Connection
Set cnn = New ADODB.Connection
cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;DSN=MyDSN;"
cnn.Open

If you are using access 97, you could use provider string OLEDB.3.51 instead, 4.0 is required for access 2000.
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Author Comment

by:karthikdd
ID: 6363931
what is the purpose of the command cnn.open
will it open the tables in it.
how to open the tables in this.
let me know plz
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LVL 43

Expert Comment

by:TimCottee
ID: 6363946
All that the cnn (Connection Object) does is open a connection to the database itself, to open a recordset against a table use the following:

Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Set cnn = New ADODB.Connection
Set rst = New ADODB.Recordset
cnn.ConnectionString = "DSN=MyDSN;"
cnn.Open
rst.Open "MyTable",cnn,adOpenStatic,adLockOptimistic,adCmdTable
With rst
 .MoveFirst
 Do
   Msgbox .Fields("MyField").Value
   .MoveNext
 Loop Until .Eof
End With
rst.Close
cnn.Close
Set rst = Nothing
Set cnn = Nothing

This method opens an entire table, if you omit the last parameter (adCmdTable) you can also use any legitimate SQL statement in the first parameter:

rst.Open "Select * From MyTable Where MyField = 'Hello'",cnn,adOpenStatic,adLockOptimistic,

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Author Comment

by:karthikdd
ID: 6363966
got an error like this

ADO could not find the specific provider
in the line

cnn.open
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Author Comment

by:karthikdd
ID: 6363999
we got the answer.

but in the cnn.open method we used the following code below.

cnn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\user\sample.mdb;Persist Security Info=False"

but actually is it possible to use the DSN name there instead of the DataSource.

can anyone help in this.
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LVL 43

Expert Comment

by:TimCottee
ID: 6364001
Use
cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;DSN=MyDSN;"

For Access 2000 or

cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.3.51;DSN=MyDSN;"

For access 97
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Author Comment

by:karthikdd
ID: 6364038
the error is could not find instalable 'ISAM'
is the error which we get now.

where r u working??
you seem to be really knowledgable person that why??
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Expert Comment

by:TimCottee
ID: 6364073
karthikdd, I am based in the UK.
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LVL 43

Expert Comment

by:TimCottee
ID: 6364102
This does seem to be a problem, as I don't use DSNs as a rule, I haven't bothered much with this in the past. Generally speaking the method you found, specifying the database path explicitly in the connection string is a much better method. In the long run it gives you greater flexibility as you don't have to setup DSN entries for every machine on which the application is installed.
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Expert Comment

by:ifthenelse
ID: 6364309
hai try this



dim cn as adodb.connection

set cn = new adodb.connection

cn.open("dsnname")


thats it....

For table to be opened

Dim rec as recordset
set rec = new adodb.recordset

open table
rec.open"select * from tablename",cn


hope this would help you..

first you should create a dsn ...
 goto start menu
click on run
type odbcad32
now now click on add
... type a dsn name
...click on select
...click on the database name
... on our left side the database name would be highlighted
....click on that other wise it would not accept.
...ok
...ok
thats it ...

happy programming
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Expert Comment

by:ifthenelse
ID: 6367649
is your problem solved ....
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Expert Comment

by:DanRollins
ID: 7199834
Hi karthikdd,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:

    Refund points and save as a 0-pt PAQ.

karthikdd, Please DO NOT accept this comment as an answer.
EXPERTS: Post a comment if you are certain that an expert deserves credit.  Explain why.
==========
DanRollins -- EE database cleanup volunteer
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Netminder earned 0 total points
ID: 7213395
Per recommendation, points refunded and question closed.

Netminder
CS Moderator
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