import java.sql.*;
import java.util.*;

public class Main {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/book";

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

public static void main(String[] args) {
    Connection conn = null;
    Statement stmt = null;
    Scanner scn = new Scanner(System.in);
    String book_name = null, author = null, comment = null;

    try {
        // STEP 2: Register JDBC driver
        Class.forName("com.mysql.jdbc.Driver");

        // STEP 3: Open a connection
        System.out.print("\nConnecting to database...");
        conn = DriverManager.getConnection(DB_URL, USER, PASS);
        System.out.println(" SUCCESS!\n");

        // STEP 4: Ask for user input
        System.out.print("Enter book's name: ");
        book_name = scn.nextLine();

        System.out.print("Enter book's author: ");
        author = scn.nextLine();

        System.out.print("Enter your comments: ");
        comment = scn.nextLine();

        // STEP 5: Excute query
        System.out.print("\nInserting records into table...");
        stmt = conn.createStatement();

        String sql = "INSERT INTO books (book_name, author, comment)" +
                "VALUES (?, ?, ?)";

        PreparedStatement preparedStatement = conn.prepareStatement(sql);
        preparedStatement.setString(1, book_name);
        preparedStatement.setString(2, author);
        preparedStatement.setString(3, comment);
        preparedStatement.executeUpdate();

        System.out.println(" SUCCESS!\n");

    } catch(SQLException se) {
        se.printStackTrace();
    } catch(Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if(stmt != null)
                conn.close();
        } catch(SQLException se) {
        }
        try {
            if(conn != null)
                conn.close();
        } catch(SQLException se) {
            se.printStackTrace();
        }
    }
    System.out.println("Thank you for your patronage!");
  }
}