How to use PHP code to operate MySQL database

The high integration of PHP and MySQL is the first choice for developing web applications, because most content management systems, e-commerce websites and other web applications need to interact with databases. MySQL is one of the most popular relational databases, and PHP can be used to operate MySQL. In some cases, you may need to delete a MySQL database or table. Below we will introduce how to use PHP code to operate a MySQL database, focusing on how to delete a database from a MySQL database.

Step 1: Connect to the MySQL database

In PHP, you need to use the mysqli or PDO extension to connect to the MySQL database. For the mysqli extension, you need to use the mysqli_connect function to connect to the MySQL database as follows:

$con = mysqli_connect("localhost","my_user","my_password","my_db");

Of course, you need to replace localhost, my_user, my_password and my_db with actual database related information.

Step 2: Write code to delete the database

Open a file (such as delete.php) and add the following code to the file:

<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
//删除数据库
$sql = "DROP DATABASE my_database";
if(mysqli_query($con,$sql)){
    echo "数据库删除成功";
} else{
    echo "Error deleting database: " . mysqli_error($con);
}
mysqli_close($con);
?>

This will delete the name The MySQL database for "my_database". If the deletion is successful, "Database deletion successful" will be output, otherwise an error message will be output.

Step 3: Run the PHP code

Upload the delete.php file to the web server and open it in the web browser (such as http://example.com/delete.php) . If all goes well, you will see a "Database deleted successfully" message.

Note: In actual applications, you must ensure that you have the appropriate permissions to delete a MySQL database or table. At the same time, deleting a database or table will completely delete all data in it, such as tables, views, stored procedures, events, etc. Therefore, you must be very careful when doing this.

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