Is it not possible to open M.S. access file?

koahnig

See also your other post and the documentation It is an example there.

I would recommend trying with a small example and a less complicated name for the file path.

rockon209

@mrjj
I am using following code
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
db.setDatabaseName("DRIVER={Microsoft Access Driver(*.accdb)};FIL={MS Access};DBQ=C:.........\Database1.accdb");

if(db.open())
qDebug() << "oK";
else
qDebug() << db.lastError();

and i am getting the following error
QSqlError("0", "QODBC3: Unable to connect", "[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified")

@koahnig
I saved my file on my desktop, i think thats the most easy path and the above code is the simplest i guess.

hskoglund

Hi, try using an absolute filepath in the DBQ clause, for example:
;DBQ=c:\\myfolder\\Database1.accdb

rockon209

@hskoglund
i tried absolute filepath also but i am getting the same error

hskoglund

I see. Did you use double backslashes?

rockon209

@hskoglund
yes i tried with double backslashes and also with forward slashes. but same error

hskoglund

Hmm, create a folder called MyFolder on your C: , copy your Database1.accdb file into it and try:

db.setDatabaseName("Driver=Microsoft Access Driver (*.mdb, *.accdb); DBQ=C:\\MyFolder\\Database1.accdb;";

mrjj

Also, did you VERIFY that odbc is available and working ?
https://www.isunshare.com/windows-10/5-ways-to-open-odbc-data-source-administrator-in-windows-10.html

This might not be related to Qt at all.

If you never worked with ODBC before, please study a bit
http://www.dummies.com/programming/sql/how-to-use-odbc-to-access-sql-data/

rockon209

@hskoglund

I tried what you suggested but getting the same error.

@mrjj

Yes the odbc is available and wroking.
and i just access the the file locally not via any server my file is in the same computer where i am writing the code

hskoglund

Hi, I googled a bit and found this thread

So if you do not have Microsoft Office installed you need to download the driver for MS Access .accdb files

Andy314

Indeed you must install the Access ODBC driver. The driver is independent from installed Office !
(Be aware Windows like to kill this driver after windows-update. So you must reinstall it sometimes.)

Then you must look in the ODBC tool from windows to find out the correct driver name. This is the correct for me (is not the same as you use):
"DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};"

rockon209

@hskoglund

i already tried downloaded and intalled the drivers, even though i have M.S Office installed on my computer. But getting the same error.

Andy314

Hi @rockon209
which Qt Version do you use?

rockon209

@Andy314
I am using Qt 5.7.0

Andy314

Hi @rockon209
the QtCompany had the idea to do not distribute the binarys for the ODBC driver anymore. That was in Version 5.5 and 5.6 I think. I initiated a discussion about it. The result was that the driver should be integrated again. I dont know if this is in 5.7 really the case.

Look if you have in the path like C:\Qt2\5.6\msvc2015\plugins\sqldrivers
the qsqlodbc files.

rockon209

@Andy314

yes the file is present in the path.

Andy314

Hello @rockon209,
oh I am happy :-)

Now your Problem:
It must work ! I use it since 1 year.

We must find the error systhematic.
First you should try a connection via the windows Windows-ODBC tool.
I there is something wrong we must not look on Qt.

rockon209

@Andy314
How to do that bcoz i new to this database access. I dont know how it works. Could you help me?

Andy314

Hi @rockon209

Search in Windows for "ODBC".
Open the Program, dont know the english name. Something like "ODBC-Datasource 32-bit"
Tabpage Drivers: Is there a entry like Microsoft Access Driver (*.mdb, *.accdb) ?

more later...

Devopia53

@rockon209

Hi.

Perhaps, you have a very minor problem.
Compare the connection strings below.

db.setDatabaseName("Driver={Microsoft Access Driver(*.mdb, *.accdb)}; DBQ=C:/MyFolder/Database1.accdb;"); // It's not OK!

db.setDatabaseName("Driver={Microsoft Access Driver (*.mdb, *.accdb)}; DBQ=C:/MyFolder/Database1.accdb;"); // It's OK!

The ODBC driver is installed by default on Windows.