基於JavaWeb的學生成績管理系統

import java.util.List;

import org.apache.log4j.Logger;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.CriteriaSpecification;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.bjpowernode.common.dao.BaseDao;

@Repository("baseDao")
public class BaseDaoImpl implements BaseDao {

private Logger logger = Logger.getLogger(this.getClass());

@Autowired
private SessionFactory sessionFactory;

public Session getSession() {
// 事務必須是開啓的(Required)，否則獲取不到
return sessionFactory.getCurrentSession();
}



@Override
public <T> void saveOrUpdate(T entity){
try{
this.getSession().saveOrUpdate(entity);
this.getSession().flush();
}catch(RuntimeException e){
logger.error("保存或更新實體異常",e);
throw e;
}

}


@SuppressWarnings("unchecked")
@Override
public <T> T get(Class<T> entityClass, String id) {
return (T) this.getSession().get(entityClass, id);
}

@Override
public int getRowCountByDetachedCriteria(DetachedCriteria condition) {
Criteria criteria = condition.getExecutableCriteria(this.getSession());
Long totalCount = (Long) criteria.setProjection(Projections.rowCount()).uniqueResult();
return totalCount == null ? 0 : totalCount.intValue();
}

@SuppressWarnings("unchecked")
@Override
public <T> List<T> findByDetachedCriteria(DetachedCriteria condition, int page, int rows) {
Criteria criteria = condition.getExecutableCriteria(this.getSession());
criteria.setFirstResult((page - 1) * rows).setMaxResults(rows);
criteria.setResultTransformer(CriteriaSpecification.ROOT_ENTITY);
return criteria.list();
}

@Override
public <T> void save(T entity) {
try{
this.getSession().save(entity);
this.getSession().flush();
}catch(RuntimeException e){
logger.error("保存實體異常",e);
throw e;
}
}

@Override
public <T> void update(T entity){
try{
this.getSession().update(entity);
this.getSession().flush();
}catch(RuntimeException e){
logger.error("更新實體異常",e);
throw e;
}
}

@Override
public <T> void delete(T entity) {
try{
this.getSession().delete(entity);
this.getSession().flush();
}catch(RuntimeException e){
logger.error("刪除實體異常",e);
throw e;
}
}


}