• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

Confused on the order of persisting

 
Ranch Hand
Posts: 42
Firefox Browser Tomcat Server Windows XP
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi guys,
I am new to hibernate and having a lot of confusions.

I created 3 classes.

User.java
Category.java
Expense.java

I have User and Category properties in Expense.java

Now when i am trying to persist only the expense object after setting the User and Category properties, i am getting TransientObjectException because i am not persisting the User and Category objects to the database.

But when I persist them before persisting the Expense object using session.save(), it works fine.

I have <many-to-one> association in Expense.hbm.xml for both User and Category, because multiple expenses can have single or many users with single or many categories.

So what is the case when we have to explicitly save these objects first and then the final object, and when is not the case.
What is the actual concept behind this? I want the User and the Category objects to automatically get persisted when i call session.save(expenseobject);

I am confused. Please help me.
 
Bartender
Posts: 1682
7
Android Mac OS X IntelliJ IDE Spring Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Take a look at the cascade attribute or annotation depeding if you are using XML or annotations. You can use CascadeType.PERSIST and CascadeType.MERGE to get the behaviour you are looking for.
 
In the renaissance, how big were the dinosaurs? Did you have tiny ads?
a bit of art, as a gift, the permaculture playing cards
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic