Hibernate- 子查询

01.搭建开发环境

02.子查询

package com.gordon.test;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import com.gordon.domain.Publisher;
import com.gordon.utils.HibernateUtil;

/**
 * 子查询
 *
 * @author Administrator
 */
public class TestDemo6 {
	/**
	 * 子查询
	 * 查询结果：
		Hibernate:
		    select
		        publisher0_.id as id1_1_,
		        publisher0_.name as name2_1_
		    from
		        t_publisher publisher0_
		    where
		        (
		            select
		                count(*)
		            from
		                t_book books1_
		            where
		                publisher0_.id=books1_.publisher_id
		        )>1
		Hibernate:
		    select
		        books0_.publisher_id as publishe4_0_0_,
		        books0_.id as id1_0_0_,
		        books0_.id as id1_0_1_,
		        books0_.name as name2_0_1_,
		        books0_.price as price3_0_1_,
		        books0_.publisher_id as publishe4_0_1_
		    from
		        t_book books0_
		    where
		        books0_.publisher_id=?
		电子工业出版社3
		Hibernate:
		    select
		        books0_.publisher_id as publishe4_0_0_,
		        books0_.id as id1_0_0_,
		        books0_.id as id1_0_1_,
		        books0_.name as name2_0_1_,
		        books0_.price as price3_0_1_,
		        books0_.publisher_id as publishe4_0_1_
		    from
		        t_book books0_
		    where
		        books0_.publisher_id=?
		北京大学出版社2
		Hibernate:
		    select
		        books0_.publisher_id as publishe4_0_0_,
		        books0_.id as id1_0_0_,
		        books0_.id as id1_0_1_,
		        books0_.name as name2_0_1_,
		        books0_.price as price3_0_1_,
		        books0_.publisher_id as publishe4_0_1_
		    from
		        t_book books0_
		    where
		        books0_.publisher_id=?
		人民邮电出版社2
	 */
	@Test
	public void run1() {
		Session session = HibernateUtil.getCurrentSession();
		Transaction transaction = session.beginTransaction();

		String hql = "from Publisher p where (select count(*) from p.books) > 1";

		List<Publisher> list = session.createQuery(hql).list();
		for (Publisher publisher : list) {
			System.out.println(publisher.getName() + publisher.getBooks().size());
		}

		transaction.commit();
	}
}