JDBC sample

package jdbctest;

//STEP 1. Import required packages
import java.sql.*;

public class JdbcTest {

    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/db_lighthouse";

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

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            //STEP 2: Register JDBC driver
            Class.forName("com.mysql.jdbc.Driver");

            //STEP 3: Open a connection
            System.out.println("Connecting to a selected database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            System.out.println("Connected database successfully...");

            //STEP 4: Execute a query
            System.out.println("Creating statement...");
            stmt = conn.createStatement();

            String sql = "SELECT * FROM tbl_users";
            ResultSet rs = stmt.executeQuery(sql);
            //STEP 5: Extract data from result set
            while (rs.next()) {
                //Retrieve by column name
                int id = rs.getInt("id");
                String uname = rs.getString("uname");
                String fname = rs.getString("fname");
                String lname = rs.getString("lname");

                //Display values
                System.out.print("ID: " + id);
                System.out.print(", Username: " + uname);
                System.out.print(", First: " + fname);
                System.out.println(", Last: " + lname);
            }
            rs.close();
        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            //Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            //finally block used to close resources
            try {
                if (stmt != null) {
                    conn.close();
                }
            } catch (SQLException se) {
            }// do nothing
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException se) {
                se.printStackTrace();
            }//end finally try
        }//end try
        System.out.println("Goodbye!");
    }

}