抽象业务类
java 代码
/**
* 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
转http://www.javaeye.com/topic/14657
java 代码
/**
* 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
转http://www.javaeye.com/topic/14657
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criteria.setProjection(null);
List items = criteria.setFirstResult(startIndex).setMaxResults(pageSize).list();
------------------------------
要是穿进来的DetachedCritera本身就有 Projection, 被你这么 criteria.setProjection(null); 会咋样?