Posted on 2008-04-02 10:07
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hibernate
问题描述：实体类答案从属于实体类问题。（一对多）
效果-》
/**
* 添加 问题 和 选项
* @throws Exception
*/@Test
public void testQu() throws Exception {
Session session = HibernateUtil.currentSession();
Transaction tr = session.beginTransaction();
//级联添加
Set options = new HashSet();
Options op1 = new Options();
op1.setName("op1");
options.add(op1);
Options op2 = new Options();
op2.setName("op2");
options.add(op2);
Options op3 = new Options();
op3.setName("op3");
options.add(op3);
Problems problems = new Problems();
problems.setName("problem_1");
problems.setOptions(options);
problems.setTdesc("tdesc");
problems.setType(1);
Long ll = (Long)session.save(problems);
System.out.println(ll);
tr.commit();
mysql> select * from options ;
+----+------------+--------+------+---------+
| id | problemsid | answer | name | visible |
+----+------------+--------+------+---------+
| 1 | 1 | NULL | op2 | 0 |
| 2 | 1 | NULL | op3 | 0 |
| 3 | 1 | NULL | op1 | 0 |
+----+------------+--------+------+---------+
3 rows in set (0.00 sec)
mysql> select * from problems ;
+----+-----------+------+-------+------------+---------+
| id | name | type | tdesc | questionid | visible |
+----+-----------+------+-------+------------+---------+
| 1 | problem_1 | 1 | tdesc | NULL | 0 |
+----+-----------+------+-------+------------+---------+
1 row in set (0.00 sec)
//级联删除
tr.begin();
session.delete( session.get(Problems.class,ll) );
tr.commit();
mysql> select * from problems ;
Empty set (0.00 sec)
mysql> select * from options ;
Empty set (0.00 sec)
HibernateUtil.closeSession();
}
Options类
.......
/**
* @hibernate.many-to-one
* cascade = "save-update"
* column = "Problemsid"
* class = "com.zhongqi.domain.Problems"
* @return
*/
public Problems getProblems() {
return problems;
}
............
Problems 类
/**
* @hibernate.set
* cascade="all-delete-orphan"
* inverse = "false"
* lazy = "true"
* @hibernate.collection-key column = "problemsid"
* @hibernate.collection-one-to-many class = "com.zhongqi.domain.Options"
* @return
*/
public Set getOptions() {
return options;
}