Changing a field from a table depending on a mysql query - php

Question

The prototype software I am creating uses the MVC framework.
I am trying to change the allowed field in the entrylog table to either "Y" (Yes) or "N" (no) depending on whether a card associated with a driver is authorised or not.
The four tables involved are card, driver, state and the entrylog table. Also there is a card_driver table which associates a card with a driver.
CREATE TABLE IF NOT EXISTS `card` (
`id` int(11) NOT NULL auto_increment,
`startdate` date NOT NULL,
`enddate` date NOT NULL,
`state_id` int(11) NOT NULL,
`referred_as` varchar(40) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `driver` (
`id` int(11) NOT NULL auto_increment,
`title` varchar(40) default NULL,
`supplier_id` int(11) NOT NULL,
`referred_as` varchar(40) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `card_driver` (
`card_id` int(11) NOT NULL,
`driver_id` int(11) NOT NULL
);
CREATE TABLE IF NOT EXISTS `state` (
`id` int(11) NOT NULL auto_increment,
`referred_as` varchar(40) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `entrylog` (
`id` int(11) NOT NULL auto_increment,
`vehicle_id` int(11) NOT NULL,
`driver_id` int(11) NOT NULL,
`venue_id` int(11) NOT NULL,
`supplier_id` int(11) NOT NULL,
`deliverydate` date NOT NULL,
`allowed` binary(1) NOT NULL default 'N',
PRIMARY KEY (`id`)
);
In the driver table I currently have code which checks the authorisation of a selected drivers associated card. I would like to apply this similiar code to the entry log, so that when using a form to enter a delivery it determines the 'allowed' field automatically. The code to check the drivers authorisation in the driver table is as follows:
if ($name == driver) {
?>
<? include('common.php') ?>
<?php
if(isset($_POST['check']))
{
$conn = mysql_connect($server, $db_user, $db_pass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$id = $_POST['id'];
$sql ="SELECT *
FROM driver AS d
INNER
JOIN card_driver AS cd
ON cd.driver_id = d.id
INNER
JOIN card AS c
ON c.id = cd.card_id
WHERE d.ID = $id";
mysql_select_db('damp');
$result = mysql_query( $sql, $conn );
$row = mysql_fetch_assoc($result);
switch($row['state_id'])
{
case "1":
echo "<strong><font color=\"green\">Authorisation Granted!</font></strong>";
break;
case "2":
echo "<strong><font color=\"red\">Your card has expired and authorisation is denied</font></strong>";
break;
case "3":
echo "<strong><font color=\"red\">Your card has been cancelled and authorisation is denied</font></strong>";
break;
default:
echo "<strong><font color=\"red\">The Card ID does not exist</font></strong>";
}
Thank you for any help or advise you can give me.
EDIT : Code from controller_create.php
if ($class_obj == "entrylog")
{
$id = $_POST['id'];
$driverid = MyActiveRecord::FindById('driver',$this_obj->driver_id);
$query = mysql_query("SUPDATE entrylog el
INNER JOIN driver AS d ON d.driver_id = el.driver_id
INNER JOIN card_driver AS cd ON cd.driver_id = d.id
INNER JOIN card AS c ON c.id = cd.card_id
SET el.allowed = CASE WHEN c.state_id = 1
THEN 'Y'
ELSE 'N'
END
WHERE el.ID = $entryLogId");
mysql_select_db('damp');
}

Answer 1

Not entirely clear on what you're asking but the following may help:
UPDATE entrylog el
INNER JOIN driver AS d ON d.id = el.driver_id
INNER JOIN card_driver AS cd ON cd.driver_id = d.id
INNER JOIN card AS c ON c.id = cd.card_id
SET el.allowed = CASE WHEN c.state_id = 1
THEN 'Y'
ELSE 'N'
END
WHERE el.ID = $entryLogId
From your most recent comment it sounds like this value should be calculated as part of your INSERT though, rather than an UPDATE later.