qt connect to oracle database on windows - c++

Question

On Windows 7 I installed qt creator and now I am trying to connect to the oracle database. I installed oracle client and plsql/developer and everything works fine. In qt creator I have error:
QsqlDatabase: QOCI driver not loaded
This qt documentation does not work for me. Is it clear tutorial how to do it on different platforms and situations?

Answer 1

Ok. I found solution.
Documentation says
set INCLUDE=%INCLUDE%;c:\oracle\oci\include
set LIB=%LIB%;c:\oracle\oci\lib\msvc
cd %QTDIR%\src\plugins\sqldrivers\oci
qmake oci.pro
nmake
If you are not using a Microsoft compiler, replace nmake with make in
the line above.
but make or nmake didn't work for me. Because I have not installed Microsoft Visual c++ on my machine.
I made instruction how to do this:
At first don't forget to install qt sources. During the installation check Sources checkbox.
then download and install oracle client win32_11gR2_client.zip. choose Runtime option during installation.(even if you are using 64 bit os download 32 bit version on oracle client). It creates c:\app\user\product\client_1... directory
then open qt minGW command line(start ->all peograms -> qt[version] -> [version] -> MinGW [version] -> Qt [version] for Desktop MinGW [version]) and move to the oci source folder:
cd C:\Qt\Qt[version]\[version]\Src\qtbase\src\plugins\sqldrivers\oci
then as documentation says include OCI(Oracle call interface) path and library:
set INCLUDE=%INCLUDE%;c:\app\user\product[version]\client_1\oci\include
set LIB=%LIB%;c:\app\user\product[version]\client_1\oci\lib\msvc
5.compile oci driver by executing these two lines:
qmake oci.pro
mingw32-make
it will creates two .dll files for you qsqloci.dll(release version) and qsqlocid.dll(debug version)
last step is to copy these two files into qtcreator installation folder.
go to the:
C:\Qt\Qt[version]\[version]\Src\qtbase\plugins\sqldrivers
and copy these files into:
C:\Qt\Qt[version]\[version]\mingw[version]\plugins\sqldrivers
and you are ready to go. to check connection try this code:
#include <QCoreApplication>
#include <QtSql>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("MY_IP_OR_HOST_NAME");
db.setDatabaseName("XE");
db.setUserName("test");
db.setPassword("test_password");
if (!db.open())
{
qDebug() << db.lastError().text();
}
else{
qDebug() << "Wow opened";
}
return a.exec();
}

Answer 2

You should use QODBC instea of QOCI.

Answer 3

gogagubi's answer is good, but step 4 does not work for me because set INCLUDE and LIB does not work for mingw32-make.
It need to set INCPATH and LIBS in oci.pro or use:
qmake "INCPAH +=c:\app\user\product[version]\client_1\oci\include
LIBS +=-Lc:\app\user\product[version]\client_1\oci\lib\msvc" oci.pro
Add the following lines to the oci.pro:
INCPATH +=c:\app\user\product[version]\client_1\oci\include
LIBS+=-Lc:\app\user\product[version]\client_1\oci\lib\msvc

Answer 4

ciao tutto;
you can connect to oracle db with QODBC driver if it exist;(default in Qt windows is exist) Like below:
QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");
db.setConnectOptions();
db.setDatabaseName("Driver={Microsoft ODBC for Oracle};Server=127.0.0.1:1521;Uid=ep;Pwd=605605");
if(!db.open())
exit(0);
QSqlQuery query(db);
query.exec("select * from t");
while(query.next())
QMessageBox::information(0,"",query.value(1).toString());
this is connected and allow to execurte query;
buona fortuna;