图书模型中添加父表关联: public function BookClass(){ return $this->_______(BookClass::class) };
时间: 2024-03-16 15:46:12 浏览: 13
在图书模型中添加父表关联,可以使用belongsTo方法,代码如下:
```
public function BookClass(){
return $this->belongsTo(BookClass::class);
}
```
这样就可以将图书模型关联到BookClass模型,并通过BookClass模型获取父表信息。
相关问题
php简易版图书管理系统
以下是一个用PHP语言编写的简易版图书管理系统的示例:
```php
<?php
// 定义Book类
class Book {
private $title;
private $author;
public function __construct($title, $author) {
$this->title = $title;
$this->author = $author;
}
public function getTitle() {
return $this->title;
}
public function getAuthor() {
return $this->author;
}
}
// 创建图书数组
$books = array(
new Book("Book 1", "Author 1"),
new Book("Book 2", "Author 2"),
new Book("Book 3", "Author 3")
);
// 查询所有图书
function getAllBooks($books) {
foreach ($books as $book) {
echo "Title: " . $book->getTitle() . ", Author: " . $book->getAuthor() . "<br>";
}
}
// 添加图书
function addBook($books, $title, $author) {
$newBook = new Book($title, $author);
$books[] = $newBook;
echo "Book added successfully!";
}
// 修改图书
function updateBook($books, $index, $title, $author) {
if (isset($books[$index])) {
$books[$index] = new Book($title, $author);
echo "Book updated successfully!";
} else {
echo "Invalid book index!";
}
}
// 调用函数演示图书管理系统功能
getAllBooks($books);
addBook($books, "Book 4", "Author 4");
updateBook($books, 1, "Updated Book 2", "Updated Author 2");
```
mysql图书管理系统设计面向对象为大学高校,请把代码和做出的表格向我展示出来
很抱歉,我是一个纯文本的AI语言模型,无法提供图形化的展示。但是我可以为您提供一份MySQL图书管理系统的代码示例和相应的表结构设计。
代码示例:
```
<?php
class Book {
private $conn;
public function __construct($host, $user, $password, $database) {
$this->conn = mysqli_connect($host, $user, $password, $database);
if (!$this->conn) {
die("Connection failed: " . mysqli_connect_error());
}
}
public function addBook($title, $author, $publisher, $publish_date, $isbn, $price) {
$sql = "INSERT INTO books (title, author, publisher, publish_date, isbn, price) VALUES ('$title', '$author', '$publisher', '$publish_date', '$isbn', '$price')";
if (mysqli_query($this->conn, $sql)) {
return true;
} else {
return false;
}
}
public function deleteBook($isbn) {
$sql = "DELETE FROM books WHERE isbn='$isbn'";
if (mysqli_query($this->conn, $sql)) {
return true;
} else {
return false;
}
}
public function updateBook($isbn, $title, $author, $publisher, $publish_date, $price) {
$sql = "UPDATE books SET title='$title', author='$author', publisher='$publisher', publish_date='$publish_date', price='$price' WHERE isbn='$isbn'";
if (mysqli_query($this->conn, $sql)) {
return true;
} else {
return false;
}
}
public function searchBook($keyword) {
$sql = "SELECT * FROM books WHERE title LIKE '%$keyword%' OR author LIKE '%$keyword%' OR publisher LIKE '%$keyword%' OR isbn LIKE '%$keyword%'";
$result = mysqli_query($this->conn, $sql);
$books = array();
while ($row = mysqli_fetch_assoc($result)) {
$books[] = $row;
}
return $books;
}
}
?>
```
表结构设计:
```
CREATE TABLE books (
id INT(11) NOT NULL AUTO_INCREMENT,
title VARCHAR(255) NOT NULL,
author VARCHAR(255) NOT NULL,
publisher VARCHAR(255) NOT NULL,
publish_date DATE NOT NULL,
isbn VARCHAR(255) NOT NULL,
price DECIMAL(10, 2) NOT NULL,
PRIMARY KEY (id)
);
```
以上代码示例和表结构设计仅供参考,具体实现还需要根据实际需求进行修改和完善。
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