Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

´«ÖDz¥¿Íjavaѧϰ jpa½ø½×_ejb³õ²½


ÎÒ½ñÌìѧϰÁËÐìÀÏʦ½²µÄejb3µÄ֪ʶ£¬ÎÒ×öÁ˼òµ¥µÄ±Ê¼Ç£º
       ÉÏÎç½²µÄÊÇjpaµÄ֪ʶ£¬ÏÂÎç½²µÄÊÇEJB3µÄ֪ʶ£º
       JPQLÓï¾ä£ºhibernateµÄHQLÓï¾äÒ»Ñù¡£
¼òµ¥²éѯ:
  Query query = em.createQuery("SELECT c from Customer c");
  return query.getResultList();
ÃüÃû²éѯ
  @Entity
  @NamedQuery(name = "findCustomerByName",
              query = "SELECT c from Customer c
                                WHERE c.name
                                LIKE :name ")
       ·ÖÒ³:
  query = em.createNamedQuery("findCustomerByName");
  query.setParameter("name", "t,om");
  query.setMaxResults(10);
  query.setFirstResult(3);
  List customers = query.getResultList();
ÉèÖòÎÊý:
  SELECT o from Order i WHERE i.orderNo = ?1
  query.setParameter(1, 100.00);
  SELECT o from Order i WHERE o.price = :price
  query.setParameter("price", 100.00);
µ¥¸öʵÌå¼ìË÷
  query.getSingleResult();
²éѯ¼¯ºÏ:
  WHERE c.orders IS EMPTY
  WHERE CONCAT(c.fname, c.lname) = 't,om'
  SELECT c.id, c.name from Customer c
¶à̬²éѯ
  SELECT c from Customer c WHERE c.name LIKE :name
·Ö×é
  SELECT o.customer, COUNT(o.id) from Order o
                                     GROUP BY o.customer
ÅÅÐò
  order by
×Ó²éѯ
  SELECT o from Order I WHERE o.customer


Ïà¹ØÎĵµ£º

ÔÚEclipseÖн«Java Projectת»»³ÉDynamic Web Project


±à¼­¹¤³ÌµÄ.projectÎļþ£º
Ìí¼Ó
<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
µ½
<natures>

& ......

Java Concurrent°üѧϰ֮BlockingQueue

BlockingQueueÊÇÒ»¸ö½Ó¿Ú£¬Ëü´ÓQueue¼Ì³Ð¶øÀ´£¬
°üº¬ÁËQueueµÄËùÓй¦ÄÜ£¬²¢ÔÚQueueµÄ»ù´¡ÉÏÌṩÁË2¸öÐµĹ¦ÄÜ£º
    1. ¼ìË÷ÔªËØÊ±µÈ´ý¶ÓÁбäΪ·Ç¿Õ
    2. ´æ´¢ÔªËØÊ±µÈ´ý¿Õ¼ä±äµÃ¿ÉÓá£
 
ÏÂÃæ³­Â¼Ò»Ð©JDKÎĵµÖйØÓÚBlockingQueueµÄ½éÉÜ£º
BlockingQueue ¿ÉÒÔÊÇÏÞ¶¨ÈÝÁ¿µÄ¡£ËüÔ ......

´«ÖDz¥¿Íjavaѧϰ hibernateÓ³Éä


ÎÒ½ñÌìѧϰÁËÐìÀÏʦ½«µÄhibernate¿ò¼Ü֪ʶ£¬ÎÒ×öÁ˼òµ¥µÄ±Ê¼Ç£º
       ¼¯ºÏÊôÐÔ´óÖ·ÖΪ¶þÖÖ£º
µ¥´¿µÄ¼¯ºÏÊôÐÔ£¬ÏñList,Set»òÊý×éµÈ¼¯ºÏÊôÐÔ¡£
              2,Map¼¯ºÏÊôÐÔ£¬Ã¿¸öÊôÐÔÖµ¶àÓÐÏà¶ÔÓ¦µÄKeyÓ³Éä¡£
&nb ......

´«ÖDz¥¿Íjavaѧϰ hibernate»º´æ

½ñÌìÎÒѧϰÁËÐìÀÏʦ½²µÄHiberbate»º´æÖªÊ¶£¬ÎÒÉÏ¿Î×öÁ˼òµ¥µÄ±Ê¼Ç£º
»º´æÀàÐÍ
     Ò».ÊÂÎñ·¶Î§:λÓÚµ±Ç°¹¤×÷µ¥Ôª,²»Äܲ¢·¢·ÃÎÊ
     ¶þ.½ø³Ì·¶Î§:¶à¸ö¹¤×÷µ¥Ôª¹²Ïí,¿É²¢·¢·ÃÎÊ,¿É´æ´¢ÊµÀý±¾ÉíÒ²¿É´æÉ¢ÁÐÊý¾Ý,È»ºóÔÚ
         & ......

Java SEÖеÄÏß³Ì

1.´´½¨Ïß³Ì
     ·½Ê½Ò»£ºÍ¨¹ýThreadµÄ×ÓÀà´´½¨£¬´ËʱÐèÒªÔÚThreadÀàµÄ×ÓÀàÖÐÖØÐ´¸¸ÀàµÄpublic void run()·½·¨
     ·½Ê½¶þ£ºÖ±½ÓʹÓÃThreadÀà´´½¨
                     ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ