hibernate 通用泛型DAO

package org.lzpeng.dao;
import java.io.Serializable;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.criterion.Criterion;
import org.springside.modules.orm.hibernate.Page;
/**
*
* @version 2009-1-10
* @author lzpeng
*
*/
public interface IGenericDAO<T, PK extends Serializable> {
public void save(T entity);
public void delete(T entity);
public void delete(PK id);
public List<T> findAll();
public Page<T> findAll(Page<T> page);
/**
* 按id获取对象.
*/
public T get(final PK id);
/**
* 按HQL查询对象列表.
*
* @param hql
* hql语句
* @param values
* 数量可变的参数
*/
public List find(String hql, Object... values);
/**
* 按HQL分页查询. 暂不支持自动获取总结果数,需用户另行执行查询.
*
* @param page
* 分页参数.包括pageSize 和firstResult.
* @param hql
* hql语句.
* @param values
* 数量可变的参数.
*
* @return 分页查询结果,附带结果列表及所有查询时的参数.
*/
public Page<T> find(Page<T> page, String hql, Object... values);
/**
* 按HQL查询唯一对象.
*/
public Object findUnique(String hql, Object... values);
/**
* 按HQL查询Intger类形结果.
*/
public Integer findInt(String hql, Object... values);
/**
* 按HQL查询Long类型结果.
*/
public Long findLong(String hql, Object... values);
/**
* 按Criterion查询对象列表.
*
* @param criterion
* 数量可变的Criterion.
*/
public List<T> findByCriteria(Criterion... criterion);
/**
* 按Criterion分页查询.
*
* @param page
* 分页参数.包括pageSize、firstResult、orderBy、asc、autoCount.
* 其中firstResult可直接指定,也可以指定pageNo. autoCount指定是否动态获取总结果数.
*
* @param criterion
* 数量可变的Criterion.
* @return 分页查询结果.附带结果列表及所有查询时的参数.
*/
public Page<T> findByCriteria(Page page, Criterion... criterion);
/**
* 按属性查找对象列表.
*/
public List<T> findByProperty(String propertyName, Object value);
/**
* 按属性查找唯一对象.
*/
public T findUniqueByProperty(String propertyName, Object value);
/**
* 根据查询函数与参数列表创建Query对象,后续可进行更多处理,辅助函数.
*/
public Query createQuery(String queryString, Object... values);
/**
* 根据Criterion条件创建Criteria,后续可进行更多处理,辅助函数.
*/
public Criteria createCriteria(Criterion... criterions);
/**
* 判断对象的属性值在数据库内是否唯一.
*
*/
public boolean isPropertyUnique(String propertyName, Object newValue,
Object orgValue);
/**
* 通过count查询获得本次查询所能获得的对象总数.
*
* @return page对象中的totalCount属性将赋值.
*/
public int countQueryResult(Page<T> page, Criteria c);
}

实现类代码

package org.lzpeng.dao.impl;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.CriteriaSpecification;
import org.hibernate.criterion.Criterion;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.util.Assert;
import org.lzpeng.dao.IGenericDAO;
import org.springside.modules.utils.BeanUtils;
import org.springside.modules.orm.hibernate.Page;
import org.springside.modules.orm.hibernate.QueryParameter;
/**
* Hibernate的范型基类.
* <p>
* 可以在service类中直接创建使用.也可以继承出DAO子类
* </p>
* 修改自Springside SimpleHibernateTemplate
*
* @param <T>
* DAO操作的对象类型
* @param <PK>
* 主键类型
*
*
*/
@SuppressWarnings("unchecked")
public class GenericDAOImpl<T, PK extends Serializable> extends
HibernateDaoSupport implements IGenericDAO<T, PK> {
protected Logger logger = LoggerFactory.getLogger(getClass());
protected SessionFactory sessionFactory;
protected Session session;
protected Class<?> entityClass;
public GenericDAOImpl() {
this.entityClass = (Class<?>) ((ParameterizedType) getClass()
.getGenericSuperclass()).getActualTypeArguments()[0];
}
public GenericDAOImpl(SessionFactory sessionFactory, Class<T> entityClass) {
super.setSessionFactory(sessionFactory);
this.entityClass = entityClass;
}
public void save(T entity) {
Assert.notNull(entity);
super.getHibernateTemplate().saveOrUpdate(entity);
logger.info("save entity: {}", entity);
}
public void delete(T entity) {
Assert.notNull(entity);
super.getHibernateTemplate().delete(entity);
logger.info("delete entity: {}", entity);
}
public void delete(PK id) {
Assert.notNull(id);
delete(get(id));
}
public List<T> findAll() {
return findByCriteria();
}
public Page<T> findAll(Page<T> page) {
return findByCriteria(page);
}
public T get(final PK id) {
if(super.getHibernateTemplate() == null){
System.out.println("asdfasdf");
}
return (T) super.getHibernateTemplate().get(entityClass, id);
}
public List find(String hql, Object... values) {
return createQuery(hql, values).list();
}
public Page<T> find(Page<T> page, String hql, Object... values) {
Assert.notNull(page);
if (page.isAutoCount()) {
logger.warn("HQL查询暂不支持自动获取总结果数,hql为{}", hql);
}
Query q = createQuery(hql, values);
if (page.isFirstSetted()) {
q.setFirstResult(page.getFirst());
}
if (page.isPageSizeSetted()) {
q.setMaxResults(page.getPageSize());
}
page.setResult(q.list());
return page;
}
/**
* 按HQL查询唯一对象.
*/
public Object findUnique(String hql, Object... values) {
return createQuery(hql, values).uniqueResult();
}
public Integer findInt(String hql, Object... values) {
return (Integer) findUnique(hql, values);
}
public Long findLong(String hql, Object... values) {
return (Long) findUnique(hql, values);
}
public List<T> findByCriteria(Criterion... criterion) {
return createCriteria(criterion).list();
}
public Page<T> findByCriteria(Page page, Criterion... criterion) {
Assert.notNull(page);
Criteria c = createCriteria(criterion);
if (page.isAutoCount()) {
page.setTotalCount(countQueryResult(page, c));
}
if (page.isFirstSetted()) {
c.setFirstResult(page.getFirst());
}
if (page.isPageSizeSetted()) {
c.setMaxResults(page.getPageSize());
}
if (page.isOrderBySetted()) {
if (page.getOrder().endsWith(QueryParameter.ASC)) {
c.addOrder(Order.asc(page.getOrderBy()));
} else {
c.addOrder(Order.desc(page.getOrderBy()));
}
}
page.setResult(c.list());
return page;
}
/**
* 按属性查找对象列表.
*/
public List<T> findByProperty(String propertyName, Object value) {
Assert.hasText(propertyName);
return createCriteria(Restrictions.eq(propertyName, value)).list();
}
public T findUniqueByProperty(String propertyName, Object value) {
Assert.hasText(propertyName);
return (T) createCriteria(Restrictions.eq(propertyName, value))
.uniqueResult();
}
public Query createQuery(String queryString, Object... values) {
Assert.hasText(queryString);
super.getSession().createQuery(queryString);
Query queryObject = super.getSession().createQuery(queryString);
if (values != null) {
for (int i = 0; i < values.length; i++) {
queryObject.setParameter(i, values[i]);
}
}
return queryObject;
}
public Criteria createCriteria(Criterion... criterions) {
Criteria criteria = super.getSession().createCriteria(entityClass);
for (Criterion c : criterions) {
criteria.add(c);
}
return criteria;
}
public boolean isPropertyUnique(String propertyName, Object newValue,
Object orgValue) {
if (newValue == null || newValue.equals(orgValue))
return true;
Object object = findUniqueByProperty(propertyName, newValue);
return (object == null);
}
public int countQueryResult(Page<T> page, Criteria c) {
CriteriaImpl impl = (CriteriaImpl) c;
// 先把Projection、ResultTransformer、OrderBy取出来,清空三者后再执行Count操作
Projection projection = impl.getProjection();
ResultTransformer transformer = impl.getResultTransformer();
List<CriteriaImpl.OrderEntry> orderEntries = null;
try {
orderEntries = (List) BeanUtils.getFieldValue(impl, "orderEntries");
BeanUtils.setFieldValue(impl, "orderEntries", new ArrayList());
} catch (Exception e) {
logger.error("不可能抛出的异常:{}", e.getMessage());
}
// 执行Count查询
int totalCount = (Integer) c.setProjection(Projections.rowCount())
.uniqueResult();
if (totalCount < 1)
return -1;
// 将之前的Projection和OrderBy条件重新设回去
c.setProjection(projection);
if (projection == null) {
c.setResultTransformer(CriteriaSpecification.ROOT_ENTITY);
}
if (transformer != null) {
c.setResultTransformer(transformer);
}
try {
BeanUtils.setFieldValue(impl, "orderEntries", orderEntries);
} catch (Exception e) {
logger.error("不可能抛出的异常:{}", e.getMessage());
}
return totalCount;
}
}

使用方法代码

1.service中直接使用
GenericDAOImpl<User, Integer> userDAO = new GenericDAOImpl<User, Integer>(sessionFactory, User.class);
2.继承出子DAO
interface IUserDAO extends IGenericDAO<User, Integer>
class UserDAOImpl extends GenericDAOImpl<User, Integer> implements IUserDAO

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hibernate 通用泛型DAO

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