looks good. standard is lazy
emmettwalsh wrote:
> 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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