hibernate query method summary

 

1. Use the Criteria class to query

eg：

  public StoreOrderConsume getByCode(String consumeCode){
      Criteria criteria = this.getSessionFactory().getCurrentSession().
createCriteria(StoreOrderConsume.class);
      criteria.add(Restrictions.eq("consumerCode", consumeCode));
      @SuppressWarnings("unchecked")
List<StoreOrderConsume> storeOrderConsumes = criteria.list();
      if(!CollectionUtils.isEmpty(storeOrderConsumes)){
         return storeOrderConsumes.get(0);
      }
      return null;
  }

   2. Use Query query

    2.1 hql statement query

 eg：

public List<StoreOrderConsume> getList() {
   String sql = " FROM StoreOrderConsume WHERE num >1";
   Query query = this.getHibernateTemplate().getSessionFactory().getCurrentSession()
.createQuery(sql.toString());
   return ( List<StoreOrderConsume>) query.list();
}

2.2 Querying tea with sql statement

eg:

@Override
public Integer getConsumerCountByOrderPrdId(Integer orderPrdId) {
   String sql = "  SELECT COUNT(id)  FROM store_order_consume WHERE STATUS=0
AND order_prd_id= "+ orderPrdId;
   Query query = this.getHibernateTemplate().getSessionFactory().getCurrentSession()
.createSQLQuery(sql.toString());
   return Integer.parseInt(query.list().get(0)+"");
}

The difference between using hql statement and sql statement is  whether createSQLQuery     has SQL.SQL.

 

3. hibernate query parameter return encapsulation

 3.1 Using Transformers to transform entities

eg：

(List<ConsumeListVo>) query.setResultTransformer(Transformers.aliasToBean(ConsumeListVo.class))
.list());

 

3.2 Single field conversion using  addScalar  method   

@Override
public List<String> getConsumeBuyerMobile() {
   String sql = "SELECT DISTINCT o.buyer_mobile AS buyerMobile FROM store_order o,store_order_prd p " +
         "WHERE o.id=p.order_id AND o.order_type =1 AND  p.order_status = 2 AND " +
         "TIMESTAMPDIFF(MONTH,o.pay_time,NOW()) >1 ";
Query query = this.getHibernateTemplate().getSessionFactory().getCurrentSession().createSQLQuery(sql.toString())
         .addScalar("buyerMobile", StringType.INSTANCE);
List <String> list = query.list();
   return list;
}

 

4. Hibernate paging query

query.setFirstResult((orderListMessDo.getPageNum()-1)*orderListMessDo.getPageSize());

query.setMaxResults(orderListMessDo.getPageSize());

5. Bring in parameters using  query.setParameter

public int updateDeliverTime(Integer orderId) throws Exception {
    String sql = "UPDATE store_order SET remind_time=NOW() WHERE status=1 AND id=:orderId";
Query query = this.getHibernateTemplate().getSessionFactory().getCurrentSession().createSQLQuery(sql.toString());
query.setParameter("orderId",orderId);
    return query.executeUpdate();
}

6. The method that hibernate uses in query is  query.setParameterList( "ids" , ids) ; 

 

public int updateMult(List<Integer> ids) {
   String hql = "update ServiceOrder mso set mso.isDel = 1 where mso.id in(:ids)";
Query query= this.currentSession().createQuery(hql);  
query.setParameterList("ids", ids); 
   return query.executeUpdate();
}