Qt SQLite no query or parameter count mismatch - c++

Question

Juggling between receiving 2 different errors.
void summary::on_pushButton_saveSummary_clicked()
{
if(db.open())
{
query.exec("insert or replace into [PN:"+partNum+" CN:"+chargeNum+"](total, defects, rust) values(1, 2, 3)");
if (!query.exec())
{
qDebug() << query.lastError();
qDebug() << query.exec()<<endl;
}
}
else
{
qDebug() << db.lastError();
}
}
The above gives error: QSqlError("", "Unable to fetch row", "No query")
While:
void summary::on_pushButton_saveSummary_clicked()
{
if(db.open())
{
qDebug() << "db open";
int a = 3;
int b = 1;
int c = 3;
query.prepare("insert into [PN:"+partNum+" CN:"+chargeNum+"](total, defects, rust) values(:total, :defects, :rust)");
query.bindValue(":total", a);
query.bindValue(":defects", b);
query.bindValue(":rust", c);
if (!query.exec())
{
qDebug() << query.lastError();
qDebug() << query.exec()<<endl;
}
}
else
{
qDebug() << db.lastError();
}
}
Yields: QSqlError("", "Parameter count mismatch", "")
The Constructor has:
db.setDatabaseName("/home/igraves/Databases/testdb");
db.open();
QString partNum = "134345";
QString chargeNum = "3452";
query.prepare("create table if not exists [PN:"+partNum+" CN:"+chargeNum+"](total int, defects int, rust int)");
query.exec();
The table is being create, I can see it. So I am guessing syntax? Although it is as the Qt wiki writes it...
Edit:
Adding some .h stuff
QString partNum;
QString chargeNum;
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
QSqlQuery query;
Answer: It was my QString variables being temporary, after the constructor was done, they went out of scope. Changed my .h
QString partNum = "124124";
QString chargeNum = "234234";

Answer 1

I see at least the following errors:
You do not set the database path.
Do not open the database when creating the table.
"134345" and "3452" are being assigned to temporary variables instead of class members
Considering the above, the following must be in the constructor:
partNum = "134345";
chargeNum = "3452";
db.setDatabaseName("/path/of/database.db");
if(db.open())
query.exec(QString("create table if not exists [PN:%1 CN:%2](total int, defects int, rust int)")
.arg(partNum)
.arg(chargeNum));