package com.squins;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Servlet implementation class DataSourceServlet
 */
@WebServlet("/DataSourceServlet")
public class DataSourceServlet extends HttpServlet {

    /**
	 * 
	 */
	
	private static final long serialVersionUID = 1L;
	@Resource(lookup = "java:/MySqlDS")
    private DataSource dataSource;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    	
        response.setContentType("text/html");

        PrintWriter out = response.getWriter();
        out.println("<h1>Hello world!</h1>");

        try (
                
        		Connection connection = dataSource.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT COUNT(*) FROM book");
             ResultSet resultSet = preparedStatement.executeQuery();
        ) {

            while (resultSet.next()) {
                out.println("You have " + resultSet.getInt(1) + " record(s) in your table.");
              //  out.println(""+InitialContext.doLookup("java:/MySqlDS"));
            }
        } catch (SQLException e) {
            throw new IllegalStateException("Failed to fetch number of books", e);
        }
    }

}