Python sqlite3 not updating some tables while others get updated - javascript

I am making a website with Python backend using flask and sqlite3. Most of my program is working, but I have a flask function that is called on a button click and executed in parallel with ajax request. It has 3 lines of sqlite updating 3 different table, but only the last one is making changes in the table. here is the function:
#app.route('/add_slot',methods=["POST","GET"])
def add_slot():
conn = sqlite3.connect("example.db")
sem = request.json["sem"]
sec = request.json["sec"]
sub = request.json["sub"]
teacher = request.json["teacher"]
room_no = request.json["room_no"]
time = int(request.json["time"])
day = int(request.json["day"])
cur = conn.execute("select assign_slot from teacher where teacher_name = '" + teacher + "'")
slots = cur.fetchall()[0][0]
slots = slots[:(day-1)*10 + time-1] + "1" + slots[(day-1)*10 + time:]
cur = conn.execute("select availability from room where room_no = " + room_no)
avail = cur.fetchall()[0][0]
avail = avail[:(day-1)*10 + time-1] + "0" + avail[(day-1)*10 + time:]
conn.execute("update room set availability = '" + avail + "' where room_no = " + room_no)
conn.execute("update teacher set assign_slot = '" + slots + "' where teacher_name = '" + teacher + "'")
conn.execute("update tt set subject_name = '" + sub + "', teacher_name = '" + teacher + "', room_no = " + room_no + " where semester = " + sem + " and section = '" + sec + "' and time_ = " + str(time) + " and day = " + str(day))
conn.commit()
conn.close()
return
And the JS code calling the function is:
The last sql line is working, which updates the table tt, but others don't. I tried executing the sql statements independently on the powershell, putting the same values for the variables as passed when the function is called, and they work in the powershell. So, why are they not working in the program?
function send_data(){
$.ajax({
type:'POST',
url:'/add_slot' ,
contentType: 'application/json;charset=UTF-8',
data : {'sec':document.getElementById("sec").value,'sem':document.getElementById("sem").value,'sub':document.getElementById("sub").value,'day':document.getElementById("sel1").value,'time':document.getElementById("sel2").value,'teacher':document.getElementById("sel3").value,'room_no':document.getElementById("sel_r").value}
});
close_popup();
initial_processing();
}

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How to insert an array with some repeating values into mysql using node.js

I'm trying to insert and values into my database and I thought having the same name for the inputs in my form would make it easier for me to insert them in bulk, I want to iterate OrderNo and quantity and insert them to a new column while keeping the other inputs such as fname the same until the values in OrderNo are done.
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This is the code that I have and currently it only accepts 1 OrderNo and quantity and when I try to order many products with different quantities it will say column count doesn't match
value count at row 1 (see attached photo below)
[the output i get from my forms *I didnt include in the screenshot the other output details such as email etc.][1]
is there a way to just iterate the OrderNo and quantity and insert them creating new columns but with the same fname and lname etc.? or do i need to use MySql cursor?
Note that my code works and inserts if i only have selected 1 order and 1 quantity in my forms
UPDATE
Attached here is what I wanna achieve. I wanna know a way to iterate or loop the OrderNo and quantity and insert them into their respective columns while keeping the other values the same like fname and lname.
I wanna achieve this

Fixed by iterating the OrderNo. Thanks so much Diogo
app.post("/send-data", (req,res)=>{
let order = req.body.OrderNo;
let quantity = req.body.quantity;
let first = req.body.fname,
last = req.body.lname,
contact = req.body.Contact,
email = req.body.emailAdd,
fb = req.body.facebook,
date = req.body.date,
delivery = req.body.delivery,
payment = req.body.payment,
time = req.body.time,
address = req.body.address;
[order].forEach((product, index, arr)=>{
const q = quantity[index];
let sql = "INSERT INTO foodorder.orders (" +
"food_id," +
" qty,"+
" customer_FName," +
" customer_LName," +
" customer_address," +
" customer_number," +
" customer_email," +
" customer_facebook," +
" order_date," +
" delivery_option," +
" mode_of_payment," +
" delivery_time" +
") VALUES (" +
con.escape(product) + `,` +
con.escape(q) + `,` +
con.escape(first) + `,` +
con.escape(last) + `,` +
con.escape(address) + `,` +
con.escape(contact) + `,` +
con.escape(""+email) + `,` +
con.escape(fb) + `,` +
con.escape(date) + `,` +
con.escape(delivery) + `,` +
con.escape(payment) + `,` +
con.escape(time) +
`)`;
con.query(sql, (err,result) => {
if(!err){
res.redirect('thankyou.html');
}
else{
res.status(404).send('ERROR. Please Go back and Order Again');
}
})
})
});

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