Win a copy of Pragmatic AI this week in the Artificial Intelligence forum!
  • 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Jeanne Boyarsky
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
Sheriffs:
  • Paul Clapham
  • Junilu Lacar
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Ganesh Patekar
  • Tim Moores
  • Pete Letkeman
  • Stephan van Hulst
Bartenders:
  • Carey Brown
  • Tim Holloway
  • Joe Ess

what does hiobernate Session's update work ?  RSS feed

 
Ranch Hand
Posts: 316
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am confused how hibernate Session's build-in method update(Object) actually works. Suppose I have a table like

STUDENT(ID, name, address, phone)

where ID is the Oracle sequence ID, and in the hibernate mapping xml file I have <id name="id" column="ID" type="long">
<generator class="sequence">
<param name="sequence">STUDENT_SEQ</param>
</generator>
</id>

And in code I have

******
Student student = new Student();
student.setName();
student.setAddress();
student.setPhone();

... // hibernate session creation
... // session stuff
session.update(student);

*********

Now, what does "update" exactly do here ? Since "ID" is the PK and it is generated by oracle sequence, it will never be identical. So how can I actually "update" a row ? for example if there is a row (john, 100 main st, 222-123-1234) before I run the code and I intend to update this row for "john" by changing the address and phone number to (john, 200 main st, 111-222-3333). But since hibernate creates a new ID for it and ID is PK, it is not supposed to "update" the row I think.. It should only "insert" this new row. but that's not what I want. So how can I update that row (what I actually want to do is "updte STUDENT set s.address =:address, s.phone := phone where s.name = :name", but that information seems not be incorporated in a simple "session.update(student)"...)
 
Greenhorn
Posts: 17
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi, have you tried using



instead
 
Raj Ohadi
Ranch Hand
Posts: 316
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Originally posted by chloe wong:
Hi, have you tried using



instead



No, I haven't. but Since I saw lot of sample codes from books used

"session.update" I think I would like to understand that well first. Could you help me with the questions I asked in the first post ?
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!