spring data jpa batch批处理

1 public interface BatchDao<T> {
2     public void batchInsert(List<T> list);
3
4     public void batchUpdate(List<T> list);
5 }

 

1 public interface ReceiptDao extends PagingAndSortingRepository<Receipt, Long>, BatchDao<Receipt> {
2
3     // start回单录入
4     Page<Receipt> findByUserId(Long userId, Pageable pageable);
5
6 }

 

01 import java.util.List;
02
03 import javax.persistence.EntityManager;
04 import javax.persistence.PersistenceContext;
05
06 import org.hibernate.Query;
07 import org.hibernate.ScrollableResults;
08 import org.hibernate.Session;
09 import org.springframework.transaction.annotation.Transactional;
10
11 import com.ygsoft.cxpt.dao.BatchDao;
12 import com.ygsoft.util.dwz.Page;
13
14 /**
15  *
16  * @author <a href="mailto:[email protected]">ketayao</a> Version 1.1.0
17  * @since 2012-8-27 上午10:55:41
18  */
19
20 public abstract class AbstractDao implements BatchDao{
21
22     @PersistenceContext
23     protected EntityManager em;
24
25     @Transactional
26     public void batchInsert(List list) {
27         for (int i = 0; i < list.size(); i++) {
28             em.persist(list.get(i));
29             if (i % 30 == 0) {
30                 em.flush();
31                 em.clear();
32             }
33         }
34     }
35
36     @Transactional
37     public void batchUpdate(List list) {
38         for (int i = 0; i < list.size(); i++) {
39             em.merge(list.get(i));
40             if (i % 30 == 0) {
41                 em.flush();
42                 em.clear();
43             }
44         }
45     }
46
47     /**
48      * Hibernate使用游标分页的一个通用查询分页方法
49      * 描述
50      * @param queryString
51      * @param parameters
52      * @param page
53      * @return
54      */
55     @SuppressWarnings("unchecked")
56     public List findPageByQuery(final String queryString,
57             final Object[] parameters, final Page page) {
58
59         Session session = (Session) em.getDelegate();
60
61         Query query = session.createQuery(queryString);
62
63         // 判断有无条件参数的情况
64         if (parameters != null) {
65             for (int i = 0; i < parameters.length; i++) {
66                 query.setParameter(i, parameters[i]);
67             }
68         }
69
70         // 使用游标来得到总条数
71         ScrollableResults sr = query.scroll();
72         sr.last();
73         int totalCount = sr.getRowNumber();
74
75         // 索引加1
76         int totalRec = totalCount + 1;
77         page.setTotalCount(totalRec);
78
79         int startIndex = (page.getPageNum() - 1) * page.getNumPerPage();
80
81         query.setFirstResult(startIndex);
82         query.setMaxResults(page.getNumPerPage());
83
84         List reList = query.list();
85
86         return reList;
87     }
88 }

 

01 import com.ygsoft.cxpt.entity.FmisItem;
02
03 /**
04  *
05  * @author  <a href="mailto:[email protected]">ketayao</a>
06  * Version  1.1.0
07  * @since   2012-9-7 下午5:28:58
08  */
09 @Repository
10 public class FmisItemDaoImpl extends AbstractDao<FmisItem> {
11
12 }