QT5 and SQLite3 "No query Unable to fetch row" - qt

Question

i have a problem with my SQLite Database in QT5. I have table called "mytable" and im trying to save, change or load data there. The table looks like this (CODE):
"mytable" ("id" INTEGER PRIMARY KEY NOT NULL , "name" VARCHAR NOT NULL , "akcie" INTEGER NOT NULL )
Then im trying to work with this database like this (CODE):
void MainWindow::on_pushButton_save_clicked()
{
QString jmeno, IDcko, ak;
IDcko = ui->lineEdit_ID->text();
jmeno = ui->lineEdit_Name->text();
ak = ui->lineEdit_Akcie->text();
open_connection();
QSqlQuery query;
query.prepare("INSERT INTO mytable(id, name, akcie) VALUES(id= \'"+ IDcko +"\', name= \'"+ jmeno +"\', akcie= \'"+ ak +"\')");
if(query.exec())
{
QMessageBox::information(this, tr("SAVED"), tr("Some text."));
close_connection();
}
else
{
QMessageBox::critical(this, tr("NOT SAVED"), query.lastError().text());
qDebug() << query.lastError().text();
}
}
In the same file im opening connection like this (CODE):
bool MainWindow::open_connection()
{
QSqlDatabase database;
database = QSqlDatabase::addDatabase("QSQLITE");
database.setDatabaseName("‪..\\added\\test_table.sqlite");
if(!database.open())
{
qDebug() << "not opened connection";
return false;
}
else
{
qDebug() << "opened connection";
return true;
}
}
And im still getting error: "No query Unable to fetch row", i have been looking for the answer really hard but nothing worked. Could it be because of some includes or am I doing something wrong?
Thank you in advance for your help!

Answer 1

You are not preparing the query right. Use bindings like:
query.prepare("INSERT INTO mytable(id, name, akcie) VALUES(:id, :name, :akcie)");
query.bindValue(":id", IDcko);
query.bindValue(":name", jmeno);
query.bindValue(":akcie", ak);

Answer 2

You did not execute the query. You should use bindings like:
query.prepare("INSERT INTO mytable(id, name, akcie) VALUES(?, ?, ?)");
query.addBindValue(IDcko);
query.addBindValue(jmeno);
query.addBindValue(ak);
query.exec();
or, like #Miki mentioned, with the help of query.bindValue(":id", IDCko) function.
The last way will be to write the query text straightly (without the need to separately call query.exec():
query("INSERT INTO mytable(id, name, akcie) VALUES(id= \'"+ IDcko +"\', name= \'"+ jmeno +"\', akcie= \'"+ ak +"\')");