小编Jay*_*pta的帖子

我正在研究的项目与DAOs下面的项目有类似的结构:

/** 
* Base DAO class
*/
@Transactional    
public class JPABase {

  @PersistenceContext
  private EntityManager entityManager;

  public void persist(Object entity) {
    entityManager.persist(entity);
  }
 //some more methods in here
}

和

/** 
* Generic DAO class implementation
*/
@Transactional 
public abstract class GenericDao extends JpaBase {
   //some methods in here
}

和

/** 
* Specialized DAO class
*/
@Repository
@Transactional
public class PersonDao extends GenericDao {
  //some methods in here
}

到现在为止,该项目使用的编译时编织,但而配置也改为使用<context:load-time-weaver/>与-javaagent:/opt/tomcat7-1/lib/spring-instrument.jar.

由于已经应用了这种改变,因此不再编织JpaBase's和 …

我有这样的数据

     X3    X4    X5    X6     X7   X24   X25   X26    X39    X40    X41    X54    X55    X56    X69    X70    X71
1 step1 step2 step3 step4 step10 step2 step3 step4 step10 step10 step10 step10 step10 step10 step10 step10 step10

我想删除重复的列。所以期望的输出是

  X3    X4    X5    X6     X7
1 step1 step2 step3 step4 step10