应用Hibernate3的DetachedCriteria实现分页查询
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分页支持类:
- package com.javaeye.common.util;
- import java.util.List;
- public class PaginationSupport {
- public final static int PAGESIZE = 30;
- private int pageSize = PAGESIZE;
- private List items;
- private int totalCount;
- private int[] indexes = new int[0];
- private int startIndex = 0;
- public PaginationSupport(List items, int totalCount) {
- setPageSize(PAGESIZE);
- setTotalCount(totalCount);
- setItems(items);
- setStartIndex(0);
- }
- public PaginationSupport(List items, int totalCount, int startIndex) {
- setPageSize(PAGESIZE);
- setTotalCount(totalCount);
- setItems(items);
- setStartIndex(startIndex);
- }
- public PaginationSupport(List items, int totalCount, int pageSize, int startIndex) {
- setPageSize(pageSize);
- setTotalCount(totalCount);
- setItems(items);
- setStartIndex(startIndex);
- }
- public List getItems() {
- return items;
- }
- public void setItems(List items) {
- this.items = items;
- }
- public int getPageSize() {
- return pageSize;
- }
- public void setPageSize(int pageSize) {
- this.pageSize = pageSize;
- }
- public int getTotalCount() {
- return totalCount;
- }
- public void setTotalCount(int totalCount) {
- if (totalCount > 0) {
- this.totalCount = totalCount;
- int count = totalCount / pageSize;
- if (totalCount % pageSize > 0)
- count++;
- indexes = new int[count];
- for (int i = 0; i < count; i++) {
- indexes[i] = pageSize * i;
- }
- } else {
- this.totalCount = 0;
- }
- }
- public int[] getIndexes() {
- return indexes;
- }
- public void setIndexes(int[] indexes) {
- this.indexes = indexes;
- }
- public int getStartIndex() {
- return startIndex;
- }
- public void setStartIndex(int startIndex) {
- if (totalCount <= 0)
- this.startIndex = 0;
- else if (startIndex >= totalCount)
- this.startIndex = indexes[indexes.length - 1];
- else if (startIndex < 0)
- this.startIndex = 0;
- else {
- this.startIndex = indexes[startIndex / pageSize];
- }
- }
- public int getNextIndex() {
- int nextIndex = getStartIndex() + pageSize;
- if (nextIndex >= totalCount)
- return getStartIndex();
- else
- return nextIndex;
- }
- public int getPreviousIndex() {
- int previousIndex = getStartIndex() - pageSize;
- if (previousIndex < 0)
- return 0;
- else
- return previousIndex;
- }
- }
package com.javaeye.common.util;import java.util.List;public class PaginationSupport {public final static int PAGESIZE = 30;private int pageSize = PAGESIZE;private List items;private int totalCount;private int[] indexes = new int[0];private int startIndex = 0;public PaginationSupport(List items, int totalCount) {setPageSize(PAGESIZE); setTotalCount(totalCount);setItems(items);setStartIndex(0);}public PaginationSupport(List items, int totalCount, int startIndex) { setPageSize(PAGESIZE);setTotalCount(totalCount);setItems(items);setStartIndex(startIndex);}public PaginationSupport(List items, int totalCount, int pageSize, int startIndex) { setPageSize(pageSize);setTotalCount(totalCount);setItems(items);setStartIndex(startIndex);}public List getItems() {return items;}public void setItems(List items) {this.items = items;}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public int getTotalCount() {return totalCount;}public void setTotalCount(int totalCount) {if (totalCount > 0) {this.totalCount = totalCount;int count = totalCount / pageSize;if (totalCount % pageSize > 0)count++;indexes = new int[count];for (int i = 0; i < count; i++) {indexes[i] = pageSize * i;}} else {this.totalCount = 0;}}public int[] getIndexes() {return indexes;}public void setIndexes(int[] indexes) {this.indexes = indexes;}public int getStartIndex() {return startIndex;}public void setStartIndex(int startIndex) {if (totalCount <= 0)this.startIndex = 0;else if (startIndex >= totalCount)this.startIndex = indexes[indexes.length - 1];else if (startIndex < 0)this.startIndex = 0;else {this.startIndex = indexes[startIndex / pageSize];}}public int getNextIndex() {int nextIndex = getStartIndex() + pageSize;if (nextIndex >= totalCount)return getStartIndex();elsereturn nextIndex;}public int getPreviousIndex() {int previousIndex = getStartIndex() - pageSize;if (previousIndex < 0)return 0;elsereturn previousIndex;}}
抽象业务类
- /**
- * Created on 2005-7-12
- */
- package com.javaeye.common.business;
- import java.io.Serializable;
- import java.util.List;
- import org.hibernate.Criteria;
- import org.hibernate.HibernateException;
- import org.hibernate.Session;
- import org.hibernate.criterion.DetachedCriteria;
- import org.hibernate.criterion.Projections;
- import org.springframework.orm.hibernate3.HibernateCallback;
- import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
- import com.javaeye.common.util.PaginationSupport;
- public abstract class AbstractManager extends HibernateDaoSupport {
- private boolean cacheQueries = false;
- private String queryCacheRegion;
- public void setCacheQueries(boolean cacheQueries) {
- this.cacheQueries = cacheQueries;
- }
- public void setQueryCacheRegion(String queryCacheRegion) {
- this.queryCacheRegion = queryCacheRegion;
- }
- public void save(final Object entity) {
- getHibernateTemplate().save(entity);
- }
- public void persist(final Object entity) {
- getHibernateTemplate().save(entity);
- }
- public void update(final Object entity) {
- getHibernateTemplate().update(entity);
- }
- public void delete(final Object entity) {
- getHibernateTemplate().delete(entity);
- }
- public Object load(final Class entity, final Serializable id) {
- return getHibernateTemplate().load(entity, id);
- }
- public Object get(final Class entity, final Serializable id) {
- return getHibernateTemplate().get(entity, id);
- }
- public List findAll(final Class entity) {
- return getHibernateTemplate().find("from " + entity.getName());
- }
- public List findByNamedQuery(final String namedQuery) {
- return getHibernateTemplate().findByNamedQuery(namedQuery);
- }
- public List findByNamedQuery(final String query, final Object parameter) {
- return getHibernateTemplate().findByNamedQuery(query, parameter);
- }
- public List findByNamedQuery(final String query, final Object[] parameters) {
- return getHibernateTemplate().findByNamedQuery(query, parameters);
- }
- public List find(final String query) {
- return getHibernateTemplate().find(query);
- }
- public List find(final String query, final Object parameter) {
- return getHibernateTemplate().find(query, parameter);
- }
- public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria) {
- return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, 0);
- }
- public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int startIndex) {
- return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, startIndex);
- }
- public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int pageSize,
- final int startIndex) {
- return (PaginationSupport) getHibernateTemplate().execute(new HibernateCallback() {
- public Object doInHibernate(Session session) throws HibernateException {
- Criteria criteria = detachedCriteria.getExecutableCriteria(session);
- int totalCount = ((Integer) criteria.setProjection(Projections.rowCount()).uniqueResult()).intValue();
- criteria.setProjection(null);
- List items = criteria.setFirstResult(startIndex).setMaxResults(pageSize).list();
- PaginationSupport ps = new PaginationSupport(items, totalCount, pageSize, startIndex);
- return ps;
- }
- }, true);
- }
- public List findAllByCriteria(final DetachedCriteria detachedCriteria) {
- return (List) getHibernateTemplate().execute(new HibernateCallback() {
- public Object doInHibernate(Session session) throws HibernateException {
- Criteria criteria = detachedCriteria.getExecutableCriteria(session);
- return criteria.list();
- }
- }, true);
- }
- public int getCountByCriteria(final DetachedCriteria detachedCriteria) {
- Integer count = (Integer) getHibernateTemplate().execute(new HibernateCallback() {
- public Object doInHibernate(Session session) throws HibernateException {
- Criteria criteria = detachedCriteria.getExecutableCriteria(session);
- return criteria.setProjection(Projections.rowCount()).uniqueResult();
- }
- }, true);
- return count.intValue();
- }
- }
/** * Created on 2005-7-12 */package com.javaeye.common.business;import java.io.Serializable;import java.util.List;import org.hibernate.Criteria;import org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.criterion.DetachedCriteria;import org.hibernate.criterion.Projections;import org.springframework.orm.hibernate3.HibernateCallback;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import com.javaeye.common.util.PaginationSupport;public abstract class AbstractManager extends HibernateDaoSupport {private boolean cacheQueries = false;private String queryCacheRegion;public void setCacheQueries(boolean cacheQueries) {this.cacheQueries = cacheQueries;}public void setQueryCacheRegion(String queryCacheRegion) {this.queryCacheRegion = queryCacheRegion;}public void save(final Object entity) {getHibernateTemplate().save(entity);}public void persist(final Object entity) {getHibernateTemplate().save(entity);}public void update(final Object entity) {getHibernateTemplate().update(entity);}public void delete(final Object entity) {getHibernateTemplate().delete(entity);}public Object load(final Class entity, final Serializable id) {return getHibernateTemplate().load(entity, id);}public Object get(final Class entity, final Serializable id) {return getHibernateTemplate().get(entity, id);}public List findAll(final Class entity) {return getHibernateTemplate().find("from " + entity.getName());}public List findByNamedQuery(final String namedQuery) {return getHibernateTemplate().findByNamedQuery(namedQuery);}public List findByNamedQuery(final String query, final Object parameter) {return getHibernateTemplate().findByNamedQuery(query, parameter);}public List findByNamedQuery(final String query, final Object[] parameters) {return getHibernateTemplate().findByNamedQuery(query, parameters);}public List find(final String query) {return getHibernateTemplate().find(query);}public List find(final String query, final Object parameter) {return getHibernateTemplate().find(query, parameter);}public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria) {return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, 0);}public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int startIndex) {return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, startIndex);}public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int pageSize,final int startIndex) {return (PaginationSupport) getHibernateTemplate().execute(new HibernateCallback() {public Object doInHibernate(Session session) throws HibernateException {Criteria criteria = detachedCriteria.getExecutableCriteria(session);int totalCount = ((Integer) criteria.setProjection(Projections.rowCount()).uniqueResult()).intValue();criteria.setProjection(null);List items = criteria.setFirstResult(startIndex).setMaxResults(pageSize).list();PaginationSupport ps = new PaginationSupport(items, totalCount, pageSize, startIndex);return ps;}}, true);}public List findAllByCriteria(final DetachedCriteria detachedCriteria) {return (List) getHibernateTemplate().execute(new HibernateCallback() {public Object doInHibernate(Session session) throws HibernateException {Criteria criteria = detachedCriteria.getExecutableCriteria(session);return criteria.list();}}, true);}public int getCountByCriteria(final DetachedCriteria detachedCriteria) {Integer count = (Integer) getHibernateTemplate().execute(new HibernateCallback() {public Object doInHibernate(Session session) throws HibernateException {Criteria criteria = detachedCriteria.getExecutableCriteria(session);return criteria.setProjection(Projections.rowCount()).uniqueResult();}}, true);return count.intValue();}}
用户在web层构造查询条件detachedCriteria,和可选的startIndex,调用业务bean的相应findByCriteria方法,返回一个PaginationSupport的实例ps。
ps.getItems()得到已分页好的结果集
ps.getIndexes()得到分页索引的数组
ps.getTotalCount()得到总结果数
ps.getStartIndex()当前分页索引
ps.getNextIndex()下一页索引
ps.getPreviousIndex()上一页索引
- 应用Hibernate3的DetachedCriteria实现分页查询
- 应用Hibernate3的DetachedCriteria实现分页查询
- 应用Hibernate3的DetachedCriteria实现分页查询
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