LOGICAL OPERATION FOR PHP WITH MYSQL (INVENTORY SYSTEM)

[Edmhar]

Hi guys i want to ask how to get the value of the in the mysql for  example

i have a equipments like camera

so i have  tbl_equipments with field of  EquipmentID, EquipmentName, NoOfEquip,  

 

for example values

EquiptmentID : 1001
EquiptmentName: Camera
NoOfEquip: 15

So my customer can see if how many available camera from our website

EXAMPLE

A customer rent a camera for 5 pcs 

if i refresh the page the remaining  camera items is 10 

and i that customer back that item item

What maybe the code?

I have no idea to make this.

[ignace]

$quantity = 15;

$order_quantity = 5;


echo $quantity - $order_quantity;

[Edmhar]

$quantity = 15;
$order_quantity = 5;

echo $quantity - $order_quantity;

I will not set the 5 pcs in the code 

 

the number of order will be input sometimes it will be 1 or 2 etc. depends to the customer 

and how i will call this from mysql?

 

 

 

[Edmhar]

the order must not have set value it must be inputed by the admin who in charge in sales.

 

<?php

include 'connect.php';

//this item order must be input by officer in charge am i correct?


$itemorder = "";

$query ="SELECT * FROM tbl_equipment WHERE Equip_ID ='".$itemid."' AND Equip_name ='".$itemname."' AND EquipVolume = '".$itemstock."' ";
query

echo  $itemname;
echo  $itemid;


echo  $itemstock - $itemorder;

//for example  stock of camera is 15 and a customer rent 5 pcs so in my admin page i will input input the  number of order and  so the other customer will see after they refresh is 10 pcs ony
// It must have effect in my database so im thinking i will use UPDATE but i dont know how to input it in
// then if item went down to 0 it will show The item is 0 with UNAVAILBLE   



?>

<?php

$conn_err ='Cant Connect';

$mysql_host = 'localhost';
$mysql_itemid = 'root';

$mysql_db = 'mis';

if (!@mysql_connect($mysql_host, $mysql_itemid)||!@mysql_select_db($mysql_db))  {
  die($conn_err);


}

?>

this is my connect.php