Retrieve multiple rows from multiple tables - php

Question

I am trying retrieve multiple rows from multiple tables but I think I am not doing it in the right way. The project is kind of a shop online, I have 3 tables in it: orders, orderdetails and services, which all are linked with an ID:
I have Order ID and Service ID in orderdetails' table, it means I inserts a row for each item on the basket linked to Service ID to see which service is, and Order Id to check for which order are. Example:
services table
-
service_id|name |price
------------------------
2 |Tech |100
------------------------
4 |Support|150
------------------------
10 |Mainten|50
------------------------
orders table
-
order_id|customer_id|name|lastname
----------------------------------
10 |16 |John|Smith
----------------------------------
orderdetails table
-
orderdetails_id|order_id|service_id|price|quantity
--------------------------------------------------
1 |10 |2 |100 |4
--------------------------------------------------
2 |10 |4 |150 |2
--------------------------------------------------
3 |10 |10 |50 |1
--------------------------------------------------
I inserts service's price on orderdetails table because maybe the services price can change AFTER a customer order it.
At this moment I have this query:
$query = $this->db->prepare(
'SELECT orders.*, orderdetails.*, services.*
FROM orders
LEFT JOIN orderdetails
ON orderdetails.order_id = orders.order_id
LEFT JOIN services
ON orderdetails.service_id = services.service_id
WHERE orders.order_id = ?
AND orders.customer_id = ?');
And I got this result:
stdClass Object
(
[order_id] => 10
[customer_id] => 16
[name] => Tech
[lastname] => Smith
[orderdetails_id] => 1
[service_id] => 2
[price] => 100
[quantity] => 4
)
stdClass Object
(
[order_id] => 10
[customer_id] => 16
[name] => Support
[lastname] => Smith
[orderdetails_id] => 2
[service_id] => 4
[price] => 150
[quantity] => 2
)
stdClass Object
(
[order_id] => 10
[customer_id] => 16
[name] => Mainten
[lastname] => Smith
[orderdetails_id] => 3
[service_id] => 10
[price] => 50
[quantity] => 1
)
I have two problems. The 1st problem is I have the same column name in orders table and services table. The 2nd is the query returns all the information (because I know I am not querying well), but I expect to receive something like this:
stdClass Object
(
[order_id] => 10
[customer_id] => 16
[name] => John
[lastname] => Smith
[orderdetails_id] => 1
[service_id] => 10
[price] => 50
[quantity] => 1
[service_name] => Mainten
[orderdetails_id2] => 2
[service_id2] => 4
[price2] => 150
[quantity2] => 2
[service_name2] => Support
[orderdetails_id3] => 3
[service_id3] => 2
[price3] => 100
[quantity3] => 4
[service_name3] => Tech
)
I mean, I am not an expert in SQL Queries, and I read a lot, but I think you guys could help me to figure it out this because I have other two tables to link with: customer-service-worker who will get the order to process, and area's table who will receive the order.
I use this code for getting the objects:
$array = array();
while($loop = $result->fetch_object()){ $array[] = $loop; }
return $array;

Answer 1

The problem is that you are using fetch_object() for getting the result but you are not renaming in the query the columns with the same name, and since you can't have two different object attributes with the same name the rest of columns are discarded.
You can either use other method for getting the values like fetch_row() or change the query to rename columns with the same name, for example:
SELECT orders.*, orderdetails_id, service_id, orderdetails.price as detail_price, quantity,
services.name as service_name, services.price as service_price
FROM orders
LEFT JOIN orderdetails ON orderdetails.order_id = orders.order_id
LEFT JOIN services ON orderdetails.service_id = services.service_id
WHERE orders.order_id = ?
As a side note if order_id is the primary key of orders you don't need to use customer_id in the where condition, and if the primary key is composed of both columns (i.e., you can have the same order ID for different customers) I recommend change it and use only order_id.