Java tutorial
/** * Copyright (c) 2005-2010 springside.org.cn * * Licensed under the Apache License, Version 2.0 (the "License"); * * $Id: HibernateDao.java 1205 2010-09-09 15:12:17Z calvinxiu $ */ package cn.newtouch.util.hibernate; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.apache.commons.lang.StringUtils; import org.hibernate.Criteria; import org.hibernate.Query; import org.hibernate.SessionFactory; import org.hibernate.criterion.CriteriaSpecification; import org.hibernate.criterion.Criterion; import org.hibernate.criterion.Disjunction; import org.hibernate.criterion.MatchMode; import org.hibernate.criterion.Order; import org.hibernate.criterion.Projection; import org.hibernate.criterion.Projections; import org.hibernate.criterion.Restrictions; import org.hibernate.impl.CriteriaImpl; import org.hibernate.transform.ResultTransformer; import org.springframework.util.Assert; import cn.newtouch.util.ReflectionUtils; import cn.newtouch.util.hibernate.PropertyFilter.MatchType; /** * ?SpringSideHibernat DAO. * * ,?. ?Service,?DAO?,?. * * @param <T> * DAO? * @param <PK> * * * @author calvin */ public class HibernateDao<T, PK extends Serializable> extends SimpleHibernateDao<T, PK> { /** * Dao?. ??Class. eg. public class UserDao extends * HibernateDao<User, Long>{ } */ public HibernateDao() { super(); } /** * ?Dao, ServiceHibernateDao. Class. eg. * HibernateDao<User, Long> userDao = new HibernateDao<User, * Long>(sessionFactory, User.class); */ public HibernateDao(final SessionFactory sessionFactory, final Class<T> entityClass) { super(sessionFactory, entityClass); } // -- --// /** * ?. */ public Page<T> getAll(final Page<T> page) { return findPage(page); } /** * HQL. * * @param page * ?. ???orderBy?. * @param hql * hql?. * @param values * ????,?. * * @return , ??. */ @SuppressWarnings("unchecked") public Page<T> findPage(final Page<T> page, final String hql, final Object... values) { Assert.notNull(page, "page?"); Query q = createQuery(hql, values); if (page.isAutoCount()) { long totalCount = countHqlResult(hql, values); page.setTotalCount(totalCount); } setPageParameterToQuery(q, page); List result = q.list(); page.setResult(result); return page; } /** * HQL. * * @param page * ?. ???orderBy?. * @param hql * hql?. * @param values * ???,??. * * @return , ??. */ @SuppressWarnings("unchecked") public Page<T> findPage(final Page<T> page, final String hql, final Map<String, ?> values) { Assert.notNull(page, "page?"); Query q = createQuery(hql, values, page); if (page.isAutoCount()) { long totalCount = countHqlResult(hql, values); page.setTotalCount(totalCount); } setPageParameterToQuery(q, page); List result = q.list(); page.setResult(result); return page; } /** * Criteria. * * @param page * ?. * @param criterions * ???Criterion. * * @return .??. */ @SuppressWarnings("unchecked") public Page<T> findPage(final Page<T> page, final Criterion... criterions) { Assert.notNull(page, "page?"); Criteria c = createCriteria(criterions); if (page.isAutoCount()) { long totalCount = countCriteriaResult(c); page.setTotalCount(totalCount); } setPageParameterToCriteria(c, page); List result = c.list(); page.setResult(result); return page; } /** * ?Query,. */ protected Query setPageParameterToQuery(final Query q, final Page<T> page) { Assert.isTrue(page.getPageSize() > 0, "Page Size must larger than zero"); // hibernatefirstResult??0 q.setFirstResult(page.getFirst() - 1); q.setMaxResults(page.getPageSize()); return q; } /** * ?Criteria,. */ protected Criteria setPageParameterToCriteria(final Criteria c, final Page<T> page) { Assert.isTrue(page.getPageSize() > 0, "Page Size must larger than zero"); // hibernatefirstResult??0 c.setFirstResult(page.getFirst() - 1); c.setMaxResults(page.getPageSize()); if (page.isOrderBySetted()) { String[] orderByArray = StringUtils.split(page.getOrderBy(), ','); String[] orderArray = StringUtils.split(page.getOrder(), ','); Assert.isTrue(orderByArray.length == orderArray.length, "???,????"); for (int i = 0; i < orderByArray.length; i++) { if (Page.ASC.equals(orderArray[i])) { c.addOrder(Order.asc(orderByArray[i])); } else { c.addOrder(Order.desc(orderByArray[i])); } } } return c; } /** * countHql. * * ???hql?,??hql?count?. */ protected long countHqlResult(final String hql, final Object... values) { String countHql = prepareCountHql(hql); try { Long count = findUnique(countHql, values); return count; } catch (Exception e) { throw new RuntimeException("hql can't be auto count, hql is:" + countHql, e); } } /** * countHql. * * ???hql?,??hql?count?. */ protected long countHqlResult(final String hql, final Map<String, ?> values) { String countHql = prepareCountHql(hql); try { Long count = findUnique(countHql, values); return count; } catch (Exception e) { throw new RuntimeException("hql can't be auto count, hql is:" + countHql, e); } } private String prepareCountHql(String orgHql) { String fromHql = orgHql; // select??order by???count,?. fromHql = "from " + StringUtils.substringAfter(fromHql, "from"); fromHql = StringUtils.substringBefore(fromHql, "order by"); String countHql = "select count(*) " + fromHql; return countHql; } /** * countCriteria. */ @SuppressWarnings("unchecked") protected long countCriteriaResult(final Criteria c) { CriteriaImpl impl = (CriteriaImpl) c; // Projection?ResultTransformer?OrderBy??,??Count? Projection projection = impl.getProjection(); ResultTransformer transformer = impl.getResultTransformer(); List<CriteriaImpl.OrderEntry> orderEntries = null; try { orderEntries = (List) ReflectionUtils.getFieldValue(impl, "orderEntries"); ReflectionUtils.setFieldValue(impl, "orderEntries", new ArrayList()); } catch (Exception e) { logger.error("??:{}", e.getMessage()); } // Count Long totalCountObject = (Long) c.setProjection(Projections.rowCount()).uniqueResult(); long totalCount = (totalCountObject != null) ? totalCountObject : 0; // ?Projection,ResultTransformerOrderBy?? c.setProjection(projection); if (projection == null) { c.setResultTransformer(CriteriaSpecification.ROOT_ENTITY); } if (transformer != null) { c.setResultTransformer(transformer); } try { ReflectionUtils.setFieldValue(impl, "orderEntries", orderEntries); } catch (Exception e) { logger.error("??:{}", e.getMessage()); } return totalCount; } // -- ?(PropertyFilter) --// /** * ,????. * * @param matchType * ??,????PropertyFilterMatcheType enum. */ public List<T> findBy(final String propertyName, final Object value, final MatchType matchType) { Criterion criterion = buildCriterion(propertyName, value, matchType); return find(criterion); } /** * ?. */ public List<T> find(List<PropertyFilter> filters) { Criterion[] criterions = buildCriterionByPropertyFilter(filters); return find(criterions); } /** * ?. */ public Page<T> findPage(final Page<T> page, final List<PropertyFilter> filters) { Criterion[] criterions = buildCriterionByPropertyFilter(filters); return findPage(page, criterions); } /** * ??Criterion,. */ protected Criterion buildCriterion(final String propertyName, final Object propertyValue, final MatchType matchType) { Assert.hasText(propertyName, "propertyName?"); Criterion criterion = null; // ?MatchTypecriterion switch (matchType) { case EQ: criterion = Restrictions.eq(propertyName, propertyValue); break; case LIKE: criterion = Restrictions.like(propertyName, (String) propertyValue, MatchMode.ANYWHERE); break; case LE: criterion = Restrictions.le(propertyName, propertyValue); break; case LT: criterion = Restrictions.lt(propertyName, propertyValue); break; case GE: criterion = Restrictions.ge(propertyName, propertyValue); break; case GT: criterion = Restrictions.gt(propertyName, propertyValue); } return criterion; } /** * ?Criterion,. */ protected Criterion[] buildCriterionByPropertyFilter(final List<PropertyFilter> filters) { List<Criterion> criterionList = new ArrayList<Criterion>(); for (PropertyFilter filter : filters) { if (!filter.hasMultiProperties()) { // ??. Criterion criterion = buildCriterion(filter.getPropertyName(), filter.getMatchValue(), filter.getMatchType()); criterionList.add(criterion); } else {// ??,or?. Disjunction disjunction = Restrictions.disjunction(); for (String param : filter.getPropertyNames()) { Criterion criterion = buildCriterion(param, filter.getMatchValue(), filter.getMatchType()); disjunction.add(criterion); } criterionList.add(disjunction); } } return criterionList.toArray(new Criterion[criterionList.size()]); } }