#ifndef CONNECTION_H#define CONNECTION_H#include <QMessageBox>#include <QSqlDatabase>inline bool createConnection(){    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");    db.setDatabaseName("../cdcollection/cdcollection.dat");    if (!db.open()) {        QMessageBox::warning(0, QObject::tr("Database Error"),                             db.lastError().text());        return false;    }    return true;}inline void createTables(){    QSqlQuery query;    query.exec("CREATE TABLE artist ("               "id INTEGER PRIMARY KEY, "               "name VARCHAR(40) NOT NULL, "               "country VARCHAR(40))");    query.exec("CREATE TABLE cd ("               "id INTEGER PRIMARY KEY, "               "title VARCHAR(40) NOT NULL, "               "artistid INTEGER NOT NULL, "               "year INTEGER NOT NULL, "               "FOREIGN KEY (artistid) REFERENCES artist)");    query.exec("CREATE TABLE track ("               "id INTEGER PRIMARY KEY, "               "title VARCHAR(40) NOT NULL, "               "duration INTEGER NOT NULL, "               "cdid INTEGER NOT NULL)");}#endif