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GAE/J 開発環境でJDO入門
~5分で出来るとこまで編 for LT~




        bose.techie.jp
JDOってなんなんだよ><

vGAE/Jでアプリを作る時に提供されてるのは
 RDBではなくてBigTableってやつ。
 それをあれこれするAPIがJDOやJPAなんだ。
 § JDOやJPAは標準的なものだからね!
   GAE/J独自じゃないよ!
はいー どーん




開発環境
  の
 作り方
開発環境構築の参考URL




     画像自重

http://gihyo.jp/dev/column/01/java/2009/0415
 あたり読むといいと思うよ。自習してくれ!
こんなこと言われないように><




 はセリ自重
本題ですよー



 今日はJDOって
どうやって書くのを
 中心にささっと
  紹介します。
まずEntity

@PersistenceCapable(                                GAE/Jでは必須
   identityType = IdentityType.APPLICATION)            アプリで
                                                     主キー定義する
public class User {
                                                      という意味

   @PrimaryKey
   @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
   private Key key;

   @Persistent                                アプリケーションで
   private String userId;                      値を自動生成

   @Persistent
   private String password;

あとげったー、せったーね。
んで Daoね その1

public class UserDao {

  public void insert(PersistenceManager pm, User user){
     pm.makePersistent(user);
  }

  public void update(PersistenceManager pm, User user){
     insert(pm, user);
  }

  public User selectKey(PersistenceManager pm, Key key){
    return (User)pm.getObjectById(User.class, key);
  }

  public void delete(PersistenceManager pm, User user){
     pm.deletePersistent(user);
  }
んで Daoね その2

    public User selectUserId(PersistenceManager pm, String userId){

        Query query = pm.newQuery(User.class);
        query.declareParameters(quot;java.lang.String userIdquot;);
        query.setRange(0, 10);

         try {
             List<User> users = (List<User>) query.execute(userId);
             If(users != null && users.size() > 0){
                return users.get(0);
             } else {
                return null;
             }
        } finally {
          query.closeAll();
        }
    }
}
じゃあ 使うよ

User user = new User();
                                                   エンティティの操作を
user.setUserId(quot;pekoquot;);
user.setPassword(quot;pokopen!quot;);                     行う為のインタフェース
PersistenceManager persistenceManager =
    PMFactory.getPersistenceManager();
Transaction transaction = persistenceManager.currentTransaction();
transaction.begin();
try {                                                  トランザクション開始
   UserDao userDao = new UserDao();
   userDao.insert(persistenceManager,user);                    データ永続化
   user = userDao.selectUserId(persistenceManager,quot;pekoquot;);
   userDao.delete(persistenceManager,user);
   transaction.commit();
} catch (Exception e) {
                                                          データ検索
   e.printStackTrace();
} finally {
   if (transaction.isActive()){
                                                       データ削除
       transaction.rollback();
   }
                                                    トランザクションコミット
   persistenceManager.close();
}
                                               トランザクションロールバック
はセリ自重
はーい 注目! ここでCMです!

WEB+DB PRESSに
グルージェント荒川大先生の
BigTable/JDOに
関する記事が掲載。
精読してね><
             はセリ自重
壮大な
前フリ終了

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