why get me this error about connection to SQL? help plz?

Hello
why get me this error about connection to SQL
my Code:

http://doc.qt.io/qt-4.8/QSqlDatabase db=QSqlDatabase::addDatabase(QODBC);

Errror :(

http://doc.qt.io/qt-4.8/D:\QtSDK\QtCreator\bin\Project7000\example\DBApp-build-desktop-Qt_4_8_0_for_Desktop_-_MinGW__Qt_SDK__Debug\..\DBApp\main.cpp:10: error: 'QODBC' was not declared in this scope

please Help me!!! :confused:

my code :

Code:

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#include <QtCore/QCoreApplication>
#include <QtSql>
#include <QDebug>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString servername="HAL//SQLEXPRESS";
    QString dbname="Booklet";
    QSqlDatabase db=QSqlDatabase::addDatabase(QODBC);
    db.setConnectOptions();
    //QString dsn=QString("DRIVER=(SQL Native Client);SERVER=%1;DATABASE=%2;UID=sa;PWD=").arg(se  rverName).arg(dbName);
    QString dsn=QString("DRIVER=(SQL Native Client);SERVER=%1;DATABASE=%2;Trusted_Connection=Y  es;").arg(servername).arg(dbname);
    db.setDatabaseName(dsn);
    if(db.open())
    {
        qDebug()<< "opened!";
        db.close();
    }
    else{qDebug()<<"Error="<<db.lastError().text();}
    return a.exec();
}

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Code:

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QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");

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thankful , But not loaded my Database ??? Why???
Attachment 8937

my database in SQL server 2008 Pictures:
Attachment 8938

thanks...

No idea, some missing odbc libraries, no QODBC driver compiled?

this is location my database?
I do not know where is the problem?

Attachment 8940

The problem is spelt out plainly in your first screen shot:

Quote:

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QSqlDatabase: QODBC driver not loaded
QSqlDatabase: available drivers:

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You have no Qt database plugins available to your program. It cannot, therefore, load the QODBC driver you ask for.

If this is your build environment then you need to build the QODBC plugin
If this is a deployed program then you need to deploy the QODBC database plugin in the correct location.

everything is equal standard but i dont know where to put the lines ????

cd %QTDIR%\src\plugins\sqldrivers\odbc
qmake odbc.pro
nmake

Did I just say? thanks...

You need to install the Qt source code for your Qt 4.8.x version if you have not got it already. %QTDIR% refers to the top of the source tree.

The commands need to be typed into a command prompt that is configured for Qt. The Qt SDK puts an icon to launch such a command prompt in the Windows Start menu so use that if you have it. If not, the Qt bin folder containing qmake.exe and the bin folder of your compiler must be on the PATH of a standard command prompt.

help me : this error is new when my project is Run...
cannot mix incompatible Qt Library<version 0x40704> with this library <version 0x40800>

Attachment 8956

thanks...

if you say Qt 4.7 to Uninstall. I do not know how should I clean it ? can not find the icon 4.7?

You are mixing Qt libraries with different versions -- 4.7.4 and 4.8.0

How do I do this?
How do not mix?

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Added after 10 minutes:

How do i do the work that this two version dont mix????
plz help...

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Added after 24 minutes:

How do i do the work that this two version dont mix????
plz help...

Quote:

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Originally Posted by complexcoding

How do I do this?
How do not mix?

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You check versions of the libraries you are using and replace those from 4.7.4 with those from 4.8.0 or the other way round. If you built your sql plugin against 4.8.0 then you can't use it with 4.7.4 libraries.

This is a clip from Qt installation of my system and Run my project. Please download the File. thanks...
http://www.4shared.com/rar/ILnhLBUe/Qt_online.html

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Added after 1 49 minutes:

Please help me!