Examples to explain how to modify the database name in PHP

PHP is a widely used server scripting language for creating dynamic web pages. When you write a website using PHP, you often need to access a database to store and retrieve data. Sometimes you may need to change the database name for various reasons. In this article, we will introduce how to modify the PHP database name (DB Name) to ensure the normal operation of the website.

1. Understand the PHP database connection method

In PHP, there are three commonly used methods to connect to the database: MySQLi, PDO and MySQL functions. Different methods can be used to connect to different databases, including MySQL, SQL Server and Oracle, etc. This article will introduce how to use mysqli to connect to a MySQL database. First, you need to set up a database connection in your PHP code. The following is a sample code to connect to a MySQL database:

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

2. Modify the database name that PHP is connected to

To change the name of the connected database, you can follow the steps below:

1. Open the code file for connecting PHP to the MySQL database.
2. Look for join statements, usually at the beginning or top of the file.
3. Find the $dbname variable and change it to the new database name.
4. Save the file and reload the PHP file.

The following is a sample code to change the database name to "myNewDB":

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myNewDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

3. Notes

1. After modifying the database name, you need to Update any query code that uses the database.
2. If you change the table name in the database, you need to update the table name in the query code.
3. If you change your username and/or password, you will need to update the connection code.
4. If you are deploying your website using a framework, CMS, or other third-party software, you will need to check the documentation to learn how to change the database name.

In short, modifying the PHP database name is a simple process. You only need to change the $dbname variable in the connection code. If you follow the steps above and take care to avoid query errors caused by changing the database name, you can ensure the normal operation of the website.

The above is the detailed content of Examples to explain how to modify the database name in PHP. For more information, please follow other related articles on the PHP Chinese website!