thanks folks, after a lot of playing about the following seems to work (to
get the parents and the children objs), Im just worried though that in a
table with a lot of associated users, that hibernate is 'eagerly' building
up a huge object graph before I call the 'gets, or is it lazy by default
@Table(name = "user")
public class User implements Serializable {
private Long id;
private String username;
private User superior;
private Set<User> subordinates = new HashSet<User>();
@OneToMany(mappedBy="superior")
public Set<User> getSubordinates() {
return subordinates;
}
public void setSubordinates(Set<User> subordinates) {
this.subordinates = subordinates;
}
@ManyToOne
@JoinColumn
public User getSuperior() {
return superior;
}
public void setSuperior(User superior) {
this.superior = superior;
}
tibi wrote:
>
> that is correct.
> and when you add the @manytoone
> the type will change from blob to int
> and will be to foreign key to superior
>
> tibi
>
>
> emmettwalsh wrote:
>> but I have to have a superior column as that will hold the id to the
>> 'parent' user ...?
>>
>>
>>
>> emmettwalsh wrote:
>>
>>> Hi, can anyone help me with this seemingly simple relationship Im trying
>>> to model
>>>
>>> Basically I have a User class/object - which maps to a User table. I
>>> want
>>> each user to contain a reference to a superior User and also a reference
>>> to a List of subordinate users.
>>>
>>> When I load a user from the database I want all this information
>>> contained
>>> in the User object without having to do any extra queries, but unsure if
>>> its possible, here is what I have so far. Can anyone tell me if I am on
>>> thr right track ...
>>>
>>>
>>> @Entity
>>> @Table(name = "user")
>>> public class User implements Serializable {
>>>
>>> private Long id;
>>> private String username;
>>>
>>> private User superior;
>>> private Set<User> subordinates = new HashSet<User>();
>>>
>>> @OneToMany(mappedBy="user",cascade=CascadeType.ALL)
>>> public Set<User> getSubordinates() {
>>> return subordinates;
>>> }
>>>
>>>
>>> @Column(nullable=true)
>>> public User getSuperior() {
>>> return superior;
>>> }
>>>
>>>
>>> the annotations created a tinyblob for some reason for the superior
>>> field
>>>
>>> mysql> desc user;
>>> +----------+-------------+------+-----+---------+----------------+
>>> | Field | Type | Null | Key | Default | Extra
>>> |
>>> +----------+-------------+------+-----+---------+----------------+
>>> | id | bigint(20) | NO | PRI | NULL |
>>> auto_increment
>>> |
>>> | superior | tinyblob | YES | | NULL |
>>> |
>>> | username | varchar(50) | NO | UNI | NULL | |
>>> +----------+-------------+------+-----+---------+----------------+
>>> 3 rows in set (0.00 sec)
>>>
>>>
>>>
>>>
>>
>>
>
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