如何使用Hibernate

Question

我想加入使用HQL兩個表或嚴格標準

表是連接兩張表

• 車表（cartId，BOOKID，customeremailid，數量）
• 書籍表（BOOKID ，BOOKNAME，bookPrice，bookQuantity）

我的SQL查詢是這樣

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 

，這將給中cartId計數和bookPrice

我正在存儲這個結果和成List<Cart>

以下是cart POJO變量

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

HQL查詢：

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擬合如何做到這一點在Hibernate中

好心建議 感謝

Answer 1

加入使用下面的Hibernate標準的示例代碼：

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

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