http://blog.csdn.net/wangshfa/article/details/27323297
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public interface BatchDao<T> { |
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public void batchInsert(List<T> list); |
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|
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public void batchUpdate(List<T> list); |
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} |
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public interface ReceiptDao extends PagingAndSortingRepository<Receipt, Long>, BatchDao<Receipt> { |
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|
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// start回单录入 |
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Page<Receipt> findByUserId(Long userId, Pageable pageable); |
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} |
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import java.util.List; |
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import javax.persistence.EntityManager; |
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import javax.persistence.PersistenceContext; |
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import org.hibernate.Query; |
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import org.hibernate.ScrollableResults; |
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import org.hibernate.Session; |
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import org.springframework.transaction.annotation.Transactional; |
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import com.ygsoft.cxpt.dao.BatchDao; |
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import com.ygsoft.util.dwz.Page; |
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/** |
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* |
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* @author <a href="mailto:[email protected]">ketayao</a> Version 1.1.0 |
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* @since 2012-8-27 上午10:55:41 |
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*/ |
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public abstract class AbstractDao implements BatchDao{ |
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@PersistenceContext |
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protected EntityManager em; |
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@Transactional |
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public void batchInsert(List list) { |
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for (int i = 0; i < list.size(); i++) { |
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em.persist(list.get(i)); |
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if (i % 30 == 0) { |
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em.flush(); |
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em.clear(); |
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} |
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} |
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} |
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|
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@Transactional |
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public void batchUpdate(List list) { |
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for (int i = 0; i < list.size(); i++) { |
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em.merge(list.get(i)); |
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if (i % 30 == 0) { |
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em.flush(); |
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em.clear(); |
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} |
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} |
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} |
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/** |
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* Hibernate使用游标分页的一个通用查询分页方法 |
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* 描述 |
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* @param queryString |
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* @param parameters |
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* @param page |
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* @return |
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*/ |
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@SuppressWarnings("unchecked") |
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public List findPageByQuery(final String queryString, |
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final Object[] parameters, final Page page) { |
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Session session = (Session) em.getDelegate(); |
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Query query = session.createQuery(queryString); |
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// 判断有无条件参数的情况 |
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if (parameters != null) { |
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for (int i = 0; i < parameters.length; i++) { |
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query.setParameter(i, parameters[i]); |
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} |
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} |
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// 使用游标来得到总条数 |
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ScrollableResults sr = query.scroll(); |
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sr.last(); |
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int totalCount = sr.getRowNumber(); |
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// 索引加1 |
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int totalRec = totalCount + 1; |
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page.setTotalCount(totalRec); |
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int startIndex = (page.getPageNum() - 1) * page.getNumPerPage(); |
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query.setFirstResult(startIndex); |
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query.setMaxResults(page.getNumPerPage()); |
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List reList = query.list(); |
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return reList; |
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} |
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} |
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import com.ygsoft.cxpt.entity.FmisItem; |
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/** |
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* |
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* @author <a href="mailto:[email protected]">ketayao</a> |
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* Version 1.1.0 |
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* @since 2012-9-7 下午5:28:58 |
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*/ |
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@Repository |
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public class FmisItemDaoImpl extends AbstractDao<FmisItem> { |
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} |
时间： 2024-08-26 20:23:14