How to add and delete folders in the database in php

With the continuous development and popularity of Web applications, the database has become the most critical part for developers. As a language widely used in web development, PHP also has very rich and powerful support for database operations. In PHP, we can add and delete folders in the database by writing corresponding code. This article will introduce the specific implementation process.

1. Preparation

Before starting to write PHP code, we need to install the necessary software and prepare the relevant environment. The specific steps are as follows:

1. Install PHP and related extensions

First, we need to install PHP locally or on the server. Taking Windows as an example here, just download the corresponding PHP installation package and install it.

Next, you need to install some necessary PHP extensions, such as mysqli, PDO and other extensions. These extensions can be enabled by setting them in the php.ini configuration file. Under the Windows operating system, the php.ini file is usually located in \php\php.ini in the PHP installation directory.

2. Install the database

Next, we need to install the database. For MySQL, you can download the corresponding installation package from the official website and install it.

After installing the database, you need to ensure that you can connect to the database through PHP code. The code example is as follows:

// Database connection configuration
$host = "localhost";
$username = "root";
$password = "" ;
$database = "test_db";

//Connect to the database
$conn = mysqli_connect($host, $username, $password, $database);
if (!$conn ) {

die("连接数据库失败: " . mysqli_connect_error());

} else {

echo "成功连接到数据库";

}
?>

In the above code, we can see that the MySQL database is connected through the mysqli_connect() function, And detect whether the connection is successful. If the connection is successful, "Successfully connected to the database" will be output. Otherwise, a specific error message will be output.

2. Adding folders

Next, we will introduce how to add folders in the database in PHP.

1. Create a form to add a folder

First, we need to create an HTML form to add a folder to the database. The code example is as follows:

<meta> 
<title>添加文件夹</title>

    文件夹名：        
     

In the above code, we created a form and specified the form submission address through the action attribute, which is add_folder.php page. The form contains an input box to accept the folder name entered by the user.

2. Write PHP script

Next, we need to write a PHP script to add the folder name submitted by the user to the database. The code example is as follows:

// Database connection configuration
$host = "localhost";
$username = "root";
$password = "" ;
$database = "test_db";

//Accept data submitted by users
$folder_name = $_POST['folder_name'];

//Execute SQL statements
$sql = "INSERT INTO folders (name) VALUES ('$folder_name')";
if (mysqli_query($conn, $sql)) {

echo "新文件夹添加成功";

} else {

echo "添加新文件夹失败: " . mysqli_error($conn);

}

//Close the database connection
mysqli_close($conn);
?>

In the above code, we first pass $_POST['folder_name'] Get the folder name submitted by the user and then use the INSERT statement to add the folder name to the database. If the addition is successful, "New folder added successfully" is output, otherwise a specific error message is output. Finally, close the database connection.

3. Deleting folders

In addition to adding folders, we also need to delete folders in the database. The specific steps are as follows:

1. Create a link to delete the folder

First, we need to create a link to delete the folder in the database. The code example is as follows:

">Delete

In the above code, we create a link and pass The GET method passes the folder ID to be deleted to the delete_folder.php page.

2. Write a PHP script

Next, we need to write a PHP script to delete the folder with the specified ID from the database. The code example is as follows:

// Database connection configuration
$host = "localhost";
$username = "root";
$password = "" ;
$database = "test_db";

//Accept passed parameters
$id = $_GET['id'];

//Execute SQL statement
$sql2 = "DELETE FROM folders WHERE id=$id";
if (mysqli_query($conn, $sql2)) {

echo "文件夹删除成功";

} else {

echo "文件夹删除失败: " . mysqli_error($conn);

}

// Close the database connection
mysqli_close($conn);
?>

In the above code, we obtain the passed folder ID through $_GET['id'], and use the DELETE statement to delete the folder from the database. If the deletion is successful, "Folder deletion successful" is output, otherwise a specific error message is output.

4. Summary

Through the introduction of this article, we have implemented the adding and deleting operations of folders in the database in PHP. Of course, this is just a simple example. In actual development, many aspects need to be considered, such as SQL injection, verification of input data, etc., which require in-depth understanding and practice by developers.

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