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Parent/Child Update

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LorenzoR

Post subject: Parent/Child Update

Posted: Tue Oct 12, 2010 3:48 am

Newbie

Joined: Tue Oct 12, 2010 3:22 am
Posts: 3

I have the following classes and a question regarding how to update the Article class when I add a new comment.

Code:

public class Article {
   ...
   
   @OneToMany(mappedBy = "article")
   private Set<Comment> comments;
}

public class Comment {
   ...
   
   @ManyToOne(cascade=CascadeType.ALL)
   @JoinColumn(name="ARTICLE_ID")
   private Article article;
}

Right now I'm doing this, but I want to know if I can somehow omit the save(comment) and let Hibernate do it.

Code:

Comment comment = new Comment(...);
article.addComment(comment);
getSession().save(comment);
getSession().merge(article);

I want to know if it is possible to have some mapping that allow me to do something like this:

Code:

Comment comment = new Comment(...);
article.addComment(comment);
getSession().merge(article);

Last edited by LorenzoR on Tue Oct 12, 2010 4:02 am, edited 2 times in total.

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LorenzoR

Post subject: Re: Parent/Child Update

Posted: Tue Oct 12, 2010 3:57 am

Newbie

Joined: Tue Oct 12, 2010 3:22 am
Posts: 3

Solved! All I had to do was change this:

Code:

@OneToMany(mappedBy = "article")

For this:

Code:

@OneToMany(mappedBy = "article", cascade = CascadeType.ALL)

But now I get this from console when, for example, an article has 6 comments:

Code:

Hibernate: insert into COMMENT (ARTICLE_ID, DATE, TEXT) values (?, ?, ?)
Hibernate: update ARTICLE set TEXT=?, TITLE=? where ARTICLE_ID=?
Hibernate: update COMMENT set ARTICLE_ID=?, DATE=?, TEXT=? where COMMENT_ID=?
Hibernate: update COMMENT set ARTICLE_ID=?, DATE=?, TEXT=? where COMMENT_ID=?
Hibernate: update COMMENT set ARTICLE_ID=?, DATE=?, TEXT=? where COMMENT_ID=?
Hibernate: update COMMENT set ARTICLE_ID=?, DATE=?, TEXT=? where COMMENT_ID=?
Hibernate: update COMMENT set ARTICLE_ID=?, DATE=?, TEXT=? where COMMENT_ID=?

And more lines of Hibernate: update COMMENT... each time I add a new comment. Is that correct?

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vijaybangy

Post subject: Re: Parent/Child Update

Posted: Tue Oct 12, 2010 8:37 am

Newbie

Joined: Tue Feb 02, 2010 10:37 am
Posts: 13

LorenzoR,
You have to put inverse="true" in comments field of Article class.

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LorenzoR

Post subject: Re: Parent/Child Update

Posted: Tue Oct 12, 2010 3:43 pm

Newbie

Joined: Tue Oct 12, 2010 3:22 am
Posts: 3

Thanks for the answer vijaybangy, but I have read in the documentation that mappedby is equivalent to inverse=true.

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