package com.lab;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.List;

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import javax.servlet.http.*;

import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import com.lab.jdo.MessageBean;

/**
 * JDOを使った登録と参照
 */
@SuppressWarnings("serial")
public class GAELabsServlet extends HttpServlet {
	
	/* (注意)インスタンス内に１つじゃないとエラーとなる */
	final static PersistenceManagerFactory pmFactory = JDOHelper.getPersistenceManagerFactory("transactions-optional");
	
	public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		
		// Googleアカウントを取得
		UserService userService = UserServiceFactory.getUserService();
		User author = userService.getCurrentUser();
		// メッセージ
		String message = "テストtest!!!";
		Date now = new Date();
		
		/* データ登録 */
		PersistenceManager pmReg = pmFactory.getPersistenceManager();
		
		// 登録対象のクラス
		MessageBean messageBean = new MessageBean(author, message, now);
		
        try {
        	pmReg.makePersistent(messageBean);
        } finally {
        	// pmReg.close();
        }
		
		
		//////////////////////////////////////////////////
		
        /* データ参照 */
		PersistenceManager pmRef = pmFactory.getPersistenceManager();
		
		try {
			// JDOQLで取得
	        String query = "select from " + MessageBean.class.getName() + " order by date desc range 1, 100";
	        List<MessageBean> mesasgeBeanList = (List<MessageBean>) pmRef.newQuery(query).execute();
	        
	        if (!mesasgeBeanList.isEmpty()) {
	        	for (MessageBean m : mesasgeBeanList) {
	        		resp.getWriter().println(m.getId() + ", " + m.getDate() + ", " + m.getAuthor() + ", " + m.getMessage() + "<br>");
	        	}
	        }
		} finally {
			pmRef.close();
		}
        
	}
}


////////////////////////////////////////////////////////////////////////

package com.lab.jdo;

import java.util.Date;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.users.User;

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class MessageBean {

	@PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Long id;
    @Persistent
    private User author;
    @Persistent
    private String message;
    @Persistent
    private Date date;
	
    public MessageBean(User author, String message, Date date) {
    	this.author = author;
    	this.message = message;
    	this.date = date;
    }

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public User getAuthor() {
		return author;
	}

	public void setAuthor(User author) {
		this.author = author;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

}