package sql;
import java.sql.*;
import java.util.ArrayList;

class Category {
    private static int catId;
    private static String catName;
    private static int catParent;

    Category(int id, String name, int parent) {
        catId = id;
        catName = name;
        catParent = parent;
        System.out.println(parent);
    }

    public void print() {
        System.out.println("|- " + catParent);
    }
}

public class SqlTask {
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/task";
    static final String USER = "root";
    static final String PASS = "";

    public static void main(String[] args) {
        ArrayList<Category> categories = new ArrayList<Category>();

        Connection conn = null;
        Statement stmt = null;
        int id;
        int parent;
        String name;
        String sql;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);

            System.out.println("Creating statement...");
            stmt = conn.createStatement();

            sql = "SELECT id, name, parent FROM category";
            ResultSet rs = stmt.executeQuery(sql);

            while(rs.next()){
                id  = rs.getInt("id");
                name = rs.getString("name");
                parent = rs.getInt("parent");

                System.out.print("ID: " + id);
                System.out.print(", name: " + name);
                System.out.println(", parent: " + parent);
                categories.add(new Category(id, name, parent));
            }

            for (Category _cat : categories) {
                _cat.print();
            }

            rs.close();
            stmt.close();
            conn.close();
        } catch(SQLException se) {
            se.printStackTrace();
        } catch(Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if(stmt!=null)
                    stmt.close();
            } catch(SQLException se2) {
            }
            try {
                if(conn!=null)
                    conn.close();
            } catch(SQLException se) {
                se.printStackTrace();
            }
        }
        System.out.println("Goodbye!");
    }

}