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package com.itcast.service.base;
import java.util.LinkedHashMap;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.itcast.util.QueryResult;
/**
 * Õë¶ÔËùÓÐʵÌåbeanµÄÒ»¸ö³éÏóÀ࣬ËùÓеÄʵÌåbean°üÀ¨ProductType,ProductµÈµÈ
 * @author lucky
 *
 */
@Transactional
public abstract class DaoSupport implements DAO {
 
 @PersistenceContext protected EntityManager em;
 
 //µ÷ÓÃÏÂÃæµÄpublic <T> void delete(Class<T> entityClass,Object[] entityids·½·¨
 public <T> void delete(Class<T> entityClass,Object entityid) {
  delete(entityClass,new Object[]{entityid});
 }
 public <T> void delete(Class<T> entityClass,Object[] entityids) {
  for(Object id:entityids){
   em.remove(em.getReference(entityClass, id));
  }
 }
 @Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)//˵Ã÷ÔÚÖ´Ðи÷½·¨µÄʱºò²»ÐèÒª½øÐÐÊÂÎñ´¦Àí
 public <T> T find(Class<T> entityClass, Object entityid) {
  return em.find(entityClass, entityid);
 }
 /**
  * ¿ÉÒÔ×Ô¶¯¹ÜÀïÖ÷¼üidµÄÉú³É£¬µ«Ç°ÌáÊÇidÊÇ×Ô¶¯Éú³ÉµÄ
  * ÈôidÊÇuuidµÄ»°£¬jpa¾Í²»Ö§³Ö×Ô¶¯¹ÜÀíÖ𽥵ŦÄÜ£¬×ÓÀà¾Í±ØÐëÖØд¸Ã·½·¨£¬ÊÖ¶¯Ìí¼ÓÖ÷¼ü
  */
 public  void save(Object entity) {
  em.persist(entity);
 }
 
 public void update(Object entity) {
  em.merge(entity);
 }
 
 @SuppressWarnings("unchecked")
 @Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)
 /**
  * ²éѯµÄÖÕ¼«×îÇ¿°æ£¬¼È¿ÉÒÔ·ÖÒ³£¬ÓÖ¿ÉÒÔ°´Ðò²éѯ£¬»¹¿ÉÒÔÓвéѯÌõ¼þ£¬ÆäËûµÄ²éѯ¶¼Ê¹ÓÃÕâ¸ö²éѯ·½·¨
  * orderby Óï¾ä¸ñʽ£ºorder by key1 asc