Selenium is a suite of tools for browser automation, and it is not specifically designed for testing databases. However, you can use Selenium to write test cases that interact with your database through the application interface, such as by using the WebDriver API to simulate user actions on a web page and verifying the resulting effects on the database.  If you want to directly access and query a database from your test code, you can use a database API or library for your programming language. For example, you might use the MySQL library for MySQL, the psycopg2 library for PostgreSQL, or the pymongo library for MongoDB.  It's also worth noting that Selenium is mainly used for testing the user interface of web applications, and it is not the best tool for testing the backend or server-side logic of your application. You might want to consider using a different tool or library for testing your database or other server-side components.