JDBC basic

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>

public class DBUtil {
public static Connection getConnection() throws ClassNotFoundException,
SQLException {
// JDBC driver name and database URL
final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
final String DB_URL = "jdbc:mysql://127.0.0.1:3309/lily";

// Database credentials
final String USER = "root";
final String PASS = "123";

// Register JDBC driver
// no need for JDBC 4+
// Class.forName(JDBC_DRIVER);

// Open a connection
System.out.println("Connecting to database...");
Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
return conn;
}

public static void executeSelect(Connection conn) throws SQLException {
System.out.println("Creating statement...");
Statement stmt = conn.createStatement();
String sql;
sql = "SELECT id, username FROM users";
ResultSet rs = stmt.executeQuery(sql);
// Extract data from result set
while (rs.next()) {
// Retrieve by column name
int id = rs.getInt("id");
String username = rs.getString("username");

// Display values
System.out.print("ID: " + id);
System.out.print(" username: " + username);
System.out.println();
}
// Clean-up environment
rs.close();
stmt.close();
}

public static void main(String[] args) throws ClassNotFoundException,
SQLException {
Connection conn = getConnection();
executeSelect(conn);

}
}