How to perform database testing in Selenium?

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class DatabaseTest {

    @Test
    public void verifyUserInDatabase() throws Exception {
        // JDBC connection
        String dbUrl = "jdbc:mysql://localhost:3306/testdb";
        String dbUser = "root";
        String dbPassword = "password";

        Connection conn = DriverManager.getConnection(dbUrl, dbUser, dbPassword);
        Statement stmt = conn.createStatement();

        // Query the database
        ResultSet rs = stmt.executeQuery("SELECT * FROM users WHERE email=''test@example.com''");

        // Validate result
        if (rs.next()) {
            String name = rs.getString("name");
            String email = rs.getString("email");
            System.out.println("User found: " + name + " — " + email);
            Assert.assertEquals(email, "test@example.com");
        } else {
            Assert.fail("User not found in database!");
        }

        rs.close();
        stmt.close();
        conn.close();
    }
}

@Test
public void registrationCreatesUserInDB() throws Exception {
    // Step 1: Register via browser (Selenium)
    driver.get("https://example.com/register");
    driver.findElement(By.id("name")).sendKeys("Test User");
    driver.findElement(By.id("email")).sendKeys("testuser@example.com");
    driver.findElement(By.id("password")).sendKeys("Password123");
    driver.findElement(By.id("registerBtn")).click();

    // Wait for success message
    WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(10));
    wait.until(ExpectedConditions.titleIs("Registration Successful"));

    // Step 2: Verify in database (JDBC)
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/app", "root", "pass");
    ResultSet rs = conn.createStatement().executeQuery(
        "SELECT COUNT(*) AS cnt FROM users WHERE email=''testuser@example.com''"
    );
    rs.next();
    int count = rs.getInt("cnt");
    Assert.assertEquals(count, 1, "User should exist in database after registration");
    conn.close();
}