How can I put the id of the school_year? - php

Question

My problem is when I save my student_votes like this:
I want that instead of the year will be save I would like to save the id. For an example, if today's year is 2016 then it will be save 2000(because it is the id of the year 2015). The first image is the studentvotes table,
it should be like syearid =2000 if the year is 2015 or if 2016 will be syearid =2001
here's my code:
<?php
require_once('auth.php');
include('connection/connect.php');
$idnum=$_POST['idnum'];
$stat='voted';
$sqla = "UPDATE student
SET status=?
WHERE idno=?";
$qa = $db->prepare($sqla);
$qa->execute(array($stat,$idnum));
$edittable=$_POST['votes'];
$a=1;
$N = count($edittable);
$YearNow=Date('Y');
for($i=0; $i < $N; $i++)
{
$sql = "UPDATE candidates,student,school_year
SET votes=votes+?
WHERE candid =? AND school_year.syearid = candidates.syearid
AND school_year.from_year like $YearNow ";
$q = $db->prepare($sql);
$q->execute(array($a,$edittable[$i]));
//I think because of this code
$sqlas = "INSERT INTO studentvotes(candid,idno,syearid) VALUES (:m,:n,:o)";
$qs = $db->prepare($sqlas);
$qs->execute(array(':m'=>$edittable[$i],':n'=>$idnum,':o'=>$YearNow));
}
header("location: notification.php?". http_build_query($query));
mysql_close($con);
?>
Need Help guys! thanks

Answer 1

I got your question finally:
after:
$qa->execute(array($stat,$idnum));
put something like: (I am not sure what database layer you use, this is mysqli example)
/** #var mysqli $con */
$years = array();
$data = $con->query('SELECT syearid, from_year FROM school_year')->fetch_all(MYSQLI_ASSOC);
foreach($data as $row)
$years[$row['syearid']] = $row['from_year'];
and update your
$qs->execute(array(':m'=>$edittable[$i],':n'=>$idnum,':o'=>$YearNow));
to
$qs->execute(array(':m'=>$edittable[$i],':n'=>$idnum,':o'=>$years[$YearNow]));
you can also query this after your operations:
UPDATE studentvotes AS sv
JOIN school_year AS sy ON sv.syearid = sy.syearid
SET sv.syearid = sy.from_year
and btw, please, put those preparations above the for loop, main purpose of prepare statements is efficiency
$q = $db->prepare("UPDATE candidates,student,school_year
SET votes=votes+?
WHERE candid =? AND school_year.syearid = candidates.syearid AND school_year.from_year like $YearNow");
$qs = $db->prepare("INSERT INTO studentvotes(candid,idno,syearid) VALUES (:m,:n,:o)");
for($i=0; $i < $N; $i++)
{
$q->execute(array($a, $edittable[$i]));
$qs->execute(array(':m'=>$edittable[$i],':n'=>$idnum,':o'=>$YearNow));
}