Laravel查询结果子数组没有说服力

Question

please help me in my project at school. How can i query in laravel controller something like this situation. I have three tables: Shipping_table and Shipping_products and tbl_products, now my table structure is this:

Shipping table:

Ship_ID (INT AUTO INC)
AMOUNT (DOUBLE,2)
NAME (VARCHAR)
SHIP_DATE (DATE)
RECEIVER (VARCHAR)

Shipping_products:

ID (INT AUTO INC)
Ship_id (foreign key from shipping table)
Product_id

Products_table:

Product_id (Auto Inc)
name(varchar)
Qty(int)
Description (varchar)

now what i want is having a query result like this: I want to get all in the shipping table and in sub-array i want to get the products that is being listed in shipping_products with the desired shipping id.

Something a result like this: EXAMPLE I HAVE 2 Shipping_table values

Array(2) {
 [0] Array(4) {
  ['Ship_id'] "1"
  ['Amount'] "10000"
  ['Ship_date'] "1995-12-11"
  ['Ship_products'] Array(3)
      ['id'] "1" Array(2)
           ['product_id'] "5"
           ['name'] "Product 1"
      ['id'] "2" Array(2)
           ['product_id'] "6"
           ['name'] "Product 2"
      ['id'] "3" Array(2)
           ['product_id'] "10"
           ['name'] "Product 15"

 }
 [1] Array(4) {
   ['Ship_id'] "2"
   ['Amount'] "15000"
   ['Ship_date'] "1995-12-15"
   ['Ship_products'] Array(2)
      ['id'] "1" Array(2)
           ['product_id'] "5"
           ['name'] "Product 1"
      ['id'] "2" Array(2)
           ['product_id'] "6"
           ['name'] "Product 2"
 }
}

Answer 1

The SQL part is easy (using JOINS)

SELECT * 
FROM Shipping S
LEFT JOIN Shipping_Products SP
  ON SP.Ship_Id=S.Ship_Id
LEFT JOIN Products P
  ON P.Product_id=SP.Product_id

The php part is more complicated, as you have to get the results in a loop and detect changes in Ship_id and Product_id and put in the resulting array.

Since this is homework .. I'll leave it as an exercise ...

---

THIS IS A QUICK ALGORITHM EXAMPLE - untested but logically sound.

$cur_ship = '';
$cur_prod = '';
$results  = array();
foreach ($resultset as $key => $row) {
   if ($cur_ship != $row['Ship_id']) {
      $cur_ship = $row['Ship_id'];
      $cur_prod = '';
      $results[$cur_ship] = array();
      // Fill ship info from $row
   }
   if ($cur_prod != $row['Product_id']) {
      $cur_prod = $row['Product_id'];
      $results[$cur_ship][$cur_prod] = array();
      // Fill Product info from $row
   }
   // FILL OUR $results[$cur_ship][$cur_prod] from $row
}