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我想分配一個產品到一個類別，我想到的唯一的解決方案是分配主鍵（在類別中的類別ID）與外鍵（類別ID在類產品）。PHP分配主鍵和外鍵
我需要做一些SQL代碼或更改index.php中的代碼嗎？
該代碼是向讀者展示我所做的！
類
public class Category {
public int Id{get;set;}
public string Name {get;set;}
}
public class Product{
public int Id{get;set;}
public int CategoryId{get;set;}
public String Brand {get;set;}
public String Name {get;set;}
public decimal Price{get;set;
}
MyDatabase的SQL
CREATE TABLE IF NOT EXISTS `product` (
`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`category_id` INT NOT NULL ,
`brand` VARCHAR(100) NOT NULL ,
`name` VARCHAR(100) NOT NULL ,
`barcode` INT NOT NULL,
`price` DECIMAL NOT NULL
) ENGINE = INNODB;
INSERT INTO `product` (`id`, `category_id`, `brand`, `name`,`barcode`,`price`) VALUES
(1,1,'Coca Cola','Coke',123456789,0.99)
CREATE TABLE IF NOT EXISTS `category` (
`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`category_name` VARCHAR(100) NOT NULL
) ENGINE = INNODB;
INSERT INTO `category` (`id`, `category_name`) VALUES
(1,'Drinks')
的index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="row">
<h3>PHP CRUD Grid</h3>
</div>
<div class="row">
<p>
<a href="create.php" class="btn btn-success">Create</a>
</p>
<table class="table table-striped table-bordered">
<thead>
<tr>
<th>Id</th>
<th>CategoryId</th>
<th>Brand</th>
<th>Name</th>
<th>Barcode</th>
<th>Price</th>
</tr>
</thead>
<tbody>
<?php
include_once 'database.php';
$pdo = Database::connect();
$sql = 'SELECT * FROM product ORDER BY id DESC';
foreach ($pdo->query($sql) as $row) {
echo '<tr>';
echo '<td>'. $row['id'] . '</td>';
echo '<td>'. $row['category_id'] . '</td>';
echo '<td>'. $row['brand'] . '</td>';
echo '<td>'. $row['name'] . '</td>';
echo '<td>'. $row['barcode'] . '</td>';
echo '<td>'. $row['price'] . '</td>';
echo '<td width=250>';
echo '<a class="btn" href="read.php?id='.$row['id'].'">Read</a>';
echo ' ';
echo '<a class="btn btn-success" href="update.php?id='.$row['id'].'">Update</a>';
echo ' ';
echo '<a class="btn btn-danger" href="delete.php?id='.$row['id'].'">Delete</a>';
echo '</td>';
echo '</tr>';
}
?>
</tbody>
</table>
<div class="container">
<div class="row">
<h3>PHP CRUD Grid</h3>
</div>
<div class="row">
<p>
<a href="createCategory.php" class="btn btn-success">Create</a>
</p>
<table class="table table-striped table-bordered">
<thead>
<tr>
<th>CategoryId</th>
<th>Category Name</th>
</tr>
</thead>
include_once 'database.php';
<?php
$sql2 = 'SELECT * FROM category ORDER BY id DESC';
foreach ($pdo->query($sql2) as $row) {
echo '<tr>';
echo '<td>'. $row['id'] . '</td>';
echo '<td>'. $row['category_name'] . '</td>';
echo '<td width=250>';
echo '<a class="btn" href="readCategory.php?id='.$row['id'].'">Read</a>';
echo ' ';
echo '<a class="btn btn-success" href="updateCategory.php?id='.$row['id'].'">Update</a>';
echo ' ';
echo '<a class="btn btn-danger" href="deleteCategory.php?id='.$row['id'].'">Delete</a>';
echo '</td>';
echo '</tr>';
}
Database::disconnect();
?>
</tbody>
</table>
</div>
</div>
</body>
</html>
<!-- <div class="container">
<div class="row">
<h3>PHP CRUD Grid</h3>
</div>
<div class="row">
<p>
<a href="create.php" class="btn btn-success">Create</a>
</p>
<table class="table table-striped table-bordered">
<thead>
<tr>
<th>CategoryId</th>
<th>Catengory Name</th>
</tr>
</thead>
$sql2 = 'SELECT * FROM category ORDER BY id DESC';
foreach ($pdo->query($sql2) as $row) {
echo '<tr>';
echo '<td>'. $row['id'] . '</td>';
echo '<td>'. $row['category_name'] . '</td>';
echo '<td width=250>';
echo '<a class="btn" href="readCategory.php?id='.$row['id'].'">Read</a>';
echo ' ';
echo '<a class="btn btn-success" href="updateCategory.php?id='.$row['id'].'">Update</a>';
echo ' ';
echo '<a class="btn btn-danger" href="deleteCategory.php?id='.$row['id'].'">Delete</a>';
echo '</td>';
echo '</tr>';
</div>
}
Database::disconnect();
?>
</tbody>
</table> -->
如果您剛開始使用PHP開發並想要創建應用程序，請選擇一個 [開發框架]（http://codegeekz.com/best-php-frameworks-for-developers/），例如[Laravel] （http://laravel.com/），適合您的風格和需求。這些附帶的例子說明了如何做到你在這裏要求的。您提供的這些代碼將模型，視圖和控制器的關注融合在一起，難以遵循，而且對其他人來說很難理解。框架支持幫助促進理解和模塊化的約定。 – tadman
感謝您的建議，但我認爲現在對我來說已經太遲了。 – TykiMikk
也許對於這個特別的努力，但對於未來的企業，您可能想要學習其中的一個，因此您不必像在這裏一樣重新發明輪子。大多數框架都有一個自動處理關鍵分配和表間關係的ORM。通常只有一行或兩行代碼來建立一對多關聯。這裏你需要幾十個甚至更多。 – tadman