Can not open SQL database with CDatabase

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I had created a sql database with SQL 2008 express and the database is saved in a folder (not network). In my MFC application, I wish to open this database but it always prompts SQL server login dialog. I wonder why it cant get the database open?

CDatabase database;
	CString SqlString;
	CString sDriver = "SQL Server";
	CString sDsn;
	CString sFile = "C:\\MyFolder\\Libraries.mdf";
	
	sDsn.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s",sDriver,sFile);

	// Open the database
	if(database.Open(NULL,false,false,sDsn))
	  AfxMessageBox("database opened!");
        else{
         .....
        }

Can someone tell me why?

Posted 10-Jun-12 22:25pm

sally8998

Updated 10-Jun-12 22:32pm

Sridhar Patnayak

v2

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barneyman · Accepted Answer · 2012-06-11T14:13:00

Solution 1

you don't access a SQL DB through the MDF file, you do it through SQL server, so your connection string is wrong

You'll need SQL2008 installed on your local machine to access that DB

Have a look at this[^] for examples

Posted 11-Jun-12 14:13pm

barneyman

Comments

sally8998 11-Jun-12 20:56pm

Dear barneyman, I had got SQL2008 express installed in my system. I checked the web you suggested, if the database is in my local machine, what should i put for the "server" for the connection string? Thanks!

barneyman 11-Jun-12 20:58pm

your machine name, or 'localhost' if you want to deploy this on other machines without having to change the DSN

sally8998 11-Jun-12 21:47pm

It still failed even I changed it to:

CDatabase database;
CString SqlString;
CString sDriver = "SQL Server";
CString sDsn, sMc;
sMc.Format("localhost");
CString sFile = "C:\\MyFolder\\Libraries.mdf";

sDsn.Format("ODBC;DRIVER={%s};Server=%s;Database=%s;Trusted_Connection=yes",sDriver,sMc,sFile);

// Open the database
if(database.Open(NULL,false,false,sDsn))
AfxMessageBox("database opened!");

barneyman 11-Jun-12 21:59pm

sFile should be the name of the database, as SQL sees it (Libraries, I'd guess), *not* the pathname to the file

sally8998 12-Jun-12 0:12am

Finally I make it! The server and database were not correct. Thanks, barneyman!