How to read QSqlQuery data from pointer

[SherifOmran]

Hello guys,

I wrote this code to read data returned from the sql query. Inside the QuerydB fn, data is read correct however in the main, it returns empty. Any idea?

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MainForm::MainForm(QWidget *parent) :
QMainWindow(parent,Qt::MSWindowsFixedSizeDialogHint),
ui(new Ui::MainForm)

{

QString SettingFile = qApp->property("SettingFile").toString();


QString query="SELECT dBpath FROM setting";
QSqlQuery queryop;
int r;
qDebug() << "queryop& " << &queryop;
QuerydB(query,qApp->property("SettingFile").toString(),&queryop,&r);

// Load database Setting file path from dB and check their existance
qDebug() << "length of query is " << r;
qDebug() << "queryop& " << &queryop;
while (queryop.next())
{
QString Stored_dBPath = queryop.value(0).toString();
Stored_dBPath = Stored_dBPath +qApp->property("SettingFileName").toString();
qDebug()<< "loop" << Stored_dBPath;
bool dBFileExist=QFile::exists(Stored_dBPath);
if (dBFileExist) { ui->logindBList->addItem(Stored_dBPath); }
}

}
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void MainForm::QuerydB(QString Query, QString dataBaseFile, QSqlQuery *result_p, int numRows)
{
/ Query: SQL query ex: insert, ... etc
dataBaseFile: filename including path to the database
result: pointer to the QSqlQuery that holds the data
lens: pointer to the number of rows in the output data
*/

dataBaseFile = QDir::toNativeSeparators(dataBaseFile);
database = new QSqlDatabase();
//set database driver to QSQLITE
*database = QSqlDatabase::addDatabase("QSQLITE");
//dbname=qApp->property("SettingFile").toString();
database->setDatabaseName(dataBaseFile);

if(!database->open())
{
    QMessageBox::warning(0,"Error","Couldn't open setting database");
    return;
}


 // read data
QSqlQuery result (Query);

// result.prepare(Query);
// result.exec ();
int r=0;
qDebug() << "result& " << &result;

result_p=&result;

while (result.next())
{
    QString Stored_dBPath = result.value(0).toString();
    qDebug()<< "fn" << Stored_dBPath;
    r++;
}
result.first();

 //close database;
// QString connname = database->connectionName();


 database->close();
 database->removeDatabase(dataBaseFile);
 delete database;

  *numRows = r;


 return;

}
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