如何获取数据并在PHP中使用id插入？

Question

I make shopping site in php and I have one issue of product data.

First I make **product** datatabe below.

    CREATE TABLE IF NOT EXISTS `product` (                                    
       `product_id` int(11) NOT NULL AUTO_INCREMENT,                               
       `product_sales_id` int(11) NOT NULL,                                        
       `product_name` varchar(100) NOT NULL,                                        
       `product_price` varchar(5000) NOT NULL,                                       
       `image_name` varchar(300) NOT NULL,                                               
       PRIMARY KEY (`product_id`)
    )


And Second table **product sales** below :

    CREATE TABLE IF NOT EXISTS `product_sales` (                                  
       `product_sales_id` int(11) NOT NULL,                                          
    )

Below page it admin site page when select product to insert in database and 
show in product page.

Add_Product.php : 

    <?php 
        include_once('include/connection.php');
        include_once('include/function.php');
    ?>

    <?php 
        if(isset($_POST['submit'])){
            $product_name = mysqli_real_escape_string($conn,$_POST['product_name']);
            $product_price = mysqli_real_escape_string($conn,$_POST['product_price']);  
            $image_name = mysqli_real_escape_string($conn, basename( $_FILES["product_image"]["name"]));

            $target_dir = "upload/";
            $target_file = $target_dir . basename($_FILES["product_image"]["name"]);
            $uploadOk = 1;
            $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
            $filetype = $_FILES["product_image"]["type"];

            $image_upload = move_uploaded_file($_FILES["product_image"]["tmp_name"], $target_file);

            if($image_upload){
                mysqli_query($conn,"INSERT INTO product(product_name,product_price,image_name) VALUES ('".$product_name."','".$product_price."','".$image_name."')");   
            }

        }
    ?>

I make on more page product sell page but i do not know how to make this Above show I make table product_sales and his id store in product table how to add product_sales in database and show in page using id through.

Answer 1

Change the product_sales_id in product_sales table into primary key and add product_id field as a foreign key in product_sales table.

Once the product is sold, you can store the product_id in the product_sales table.

And you can fetch the sold product details from product table using product_id which is present in the product_sales table using join query.