如何使用Hibernate

Question

我想加入使用HQL两个表或严格标准

表是连接两张表

• 车表（cartId，BOOKID，customeremailid，数量）
• 书籍表（BOOKID ，BOOKNAME，bookPrice，bookQuantity）

我的SQL查询是这样

select count(c.cartId) as cartId,b.bookName as bookName,c.customeremailid as customeremailid,sum(b.bookPrice)as c.price,c.quantity from Book b,Cart c where c.customeremailid='"+customeremailid+"' and b.bookId=c.bookid 

，这将给中cartId计数和bookPrice

我正在存储这个结果和成List<Cart>

以下是cart POJO变量

private int bookid,cartId; 
    private String customeremailid,bookName,bookDescription,image; 
    private int quantity; 
    private long price; 

HQL查询：

String sql="select count(c.cartId) as cartId,b.bookName as bookName,c.customeremailid as customeremailid,sum(b.bookPrice)as price,c.quantity from Book b,Cart c where c.customeremailid='"+customeremailid+"' and b.bookId=c.bookid"; 
      Query q=s.createSQLQuery(sql); 
      Cartlist=q.setResultTransformer(Transformers.aliasToBean(Cart.class)).list(); 


      for(Cart c :Cartlist) 
      { 
       System.out.println("in cart : "+c.getCartId()); 
       System.out.println("in cart : "+c.getPrice()); 
      } 

Iam not ge拟合如何做到这一点在Hibernate中

好心建议 感谢

Answer 1

加入使用下面的Hibernate标准的示例代码：

List cats = sess.createCriteria(Cat.class) 
    .createAlias("kittens", "kt") 
    .createAlias("mate", "mt") 
    .add(Restrictions.eqProperty("kt.name", "mt.name")) 
    .list(); 

参考：https://docs.jboss.org/hibernate/orm/3.5/reference/en/html/querycriteria.html#querycriteria-associations