[SOLVED] database opened .. database not open

so i was one day programming using Qt
i tried creating a class file name 'database' and added 3 methods
'createConnection', 'execute' and 'close'

in my main.cpp

Code:

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#include <QtGui/QApplication>
#include "mainwindow.h"
#include "../library/database.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    database myDb;
    myDb.createConnection("QSQLITE","../healthdex/resources/recipes.sqlite");
    myDb.execute("SELECT * FROM recipe");
    myDb.close();
 
 
    MainWindow w;
    w.show();
 
    return a.exec();
}

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for the first try it worked! then after clicking the debug button again
it returned errors

Code:

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Database Opened 
QSqlQuery::exec: database not open
There is an error QSqlError(-1, "Driver not loaded", "Driver not loaded")

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i included the files in my project so you can see the 'database' class that i created
Attachment 5981

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Added after 27 minutes:

tried adding ..

Code:

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if(database::querier.exec(query, this->db)){

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and

Code:

---

if(database::querier.exec(query, database::db)){

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in line 26 but it returned 'no matching function for call...'

fixed it by adding

Code:

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database::querier = QSqlQuery::QSqlQuery(database::db);

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above the

Code:

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if(database::querier.exec(query)){

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:)

One needs to use QSqlDatabase::addDatabase() to load the database driver first.