我有以下类我试图使用JPA获得一对多的关系。 当发送的XML消息restcontroller，该消息同时存储父和子表，但是外键始终为空。 请让我知道，如果任何问题。
其中我使用来持久数据和下面其余服务是我张贴到该静止方法的示例XML。
@RequestMapping(value="/team/", method = RequestMethod.POST , headers="Accept=application/xml")
@ResponseStatus(value = HttpStatus.OK)
public void createTeam(@RequestBody Team team) throws Exception {
teamService.createTeam(team);
}
儿童类
@XmlRootElement
@Entity
public class Player {
@Id
@GeneratedValue
@Column(name = "player_id")
private long player_id;
@Column(unique=true , nullable = false)
private String name;
@ManyToOne
@JoinColumn(name = "team_id")
private Team team;
and setter and getters....
}
和我的父类
@XmlRootElement
@Entity(name ="team")
public class Team {
@Id
@GeneratedValue
@Column(name = "team_id")
private long team_id;
@Column(unique=true , nullable = false)
private String name;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "team")
private List<Player> player;
and setter and getter
}
@Service
@Transactional
public class TeamServiceImpl implements TeamService{
protected EntityManager entityManager;
public EntityManager getEntityManager() {
return entityManager;
}
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
@Override
public List<Team> getTeam() {
Query query = getEntityManager().createQuery("select a from team a");
List<Team> resultList = query.getResultList();
return resultList;
}
@Override
public void createTeam(Team team) {
getEntityManager().persist(team);
}
}
@Service
@Transactional
public class PlayerServiceImpl implements PlayerService {
protected EntityManager entityManager;
public EntityManager getEntityManager() {
return entityManager;
}
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
@Override
public List<Player> getPlayer() {
Query query = getEntityManager().createQuery("select a from Player a");
List<Player> resultList = query.getResultList();
return resultList;
}
@Override
public void createPlayer(Player player) {
getEntityManager().persist(player);
}
}
和我的XML
<team>
<name>CSK</name>
<Players>
<player>
<name>kholi</name>
</player>
<player>
<name>king</name>
</player>
<player>
<name>raja</name>
</player>
</Players>
</team>
下面是建立在团队入境后的结果我在表中看到。 请注意，在播放表TEAM_ID字段为空。 这是我的问题。 需要知道我可以修复它，使这一领域将得到TEAM_ID值。
mysql> select * from team;
+---------+-------+
| team_id | name |
+---------+-------+
| 1 | Delhi |
+---------+-------+
1 row in set (0.00 sec)
mysql> select * from player;
+-----------+--------+---------+
| player_id | name | team_id |
+-----------+--------+---------+
| 1 | kholi1 | NULL |
| 2 | king | NULL |
| 3 | raja | NULL |
| 4 | kholi | NULL |
| 5 | a | NULL |
| 6 | b | NULL |
| 7 | c | NULL |
| 8 | d | NULL |
| 9 | e | NULL |
| 10 | f | NULL |
| 11 | g | NULL |
| 12 | h | NULL |
| 13 | i | NULL |
| 14 | j | NULL |
| 15 | k | NULL |
| 16 | l | NULL |
| 17 | m | NULL |
| 18 | n | NULL |
| 20 | sdsdsd | NULL |
+-----------+--------+---------+
19 rows in set (0.00 sec)
