Win a copy of GANs in ActionE this week in the AI forum
or WebAssembly in Action in the JavaScript 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:
  • Campbell Ritchie
  • Bear Bibeault
  • Paul Clapham
  • Jeanne Boyarsky
  • Knute Snortum
Sheriffs:
  • Liutauras Vilda
  • Tim Cooke
  • Junilu Lacar
Saloon Keepers:
  • Ron McLeod
  • Stephan van Hulst
  • Tim Moores
  • Tim Holloway
  • Carey Brown
Bartenders:
  • Joe Ess
  • salvin francis
  • fred rosenberger

Join using Hibernate

 
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All,

I m trying to join two tables say hiber_employee(id,empId,name,designation) and hiber_company(companyid,empid,grade,salary).
but i dont want to store the joined values into a new table.
i have made three persistence classes for each table and 1 POJO for the join.
my hiber_join.hbm.xml file looks like..

<hibernate-mapping >
<class name="join.Hiber_Join" >
<id name="joinId" type="int" unsaved-value="null">
<column name="ID" sql-type="number" not-null="true"/>
<generator class="hilo"/>
</id>
<property name="empId"/>
<property name="name"/>
<property name="grade"/>
<property name="salary"/>
<property name="designation"/>
</class>
<class name="join.Hiber_Company" table="hiber_company">
<id name="companyId" type="int" unsaved-value="null">
<column name="COMPANY_ID" sql-type="number" not-null="true"/>
<generator class="hilo"/>
</id>
<property name="empId"/>
<property name="grade"/>
<property name="salary"/>
</class>
<class name="join.Hiber_Employee" table="hiber_employee">
<id name="id" type="int" unsaved-value="null">
<column name="ID" sql-type="number" not-null="true"/>
<generator class="hilo"/>
</id>
<property name="name"/>
<property name="empId"/>
<property name="desgn"/>
</class>
</hibernate-mapping>

is this the right way of writing .hbm.xml in case of join...??
 
Greenhorn
Posts: 6
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hello,

You don't do joins in Hibernate, Hibernate does it for you. You should read the Hibernate reference manual (http://www.hibernate.org/hib_docs/v3/reference/en/html/), it explains everything you need to know...

Regards,
Jan
 
Ranch Hand
Posts: 1071
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It looks like you're trying to design your classes around the database. What you should be doing is design the classes then map them to the database. It looks to me like you should only have two classes, somthing like:

From there you could build your Company.hbm.xml and Employee.hbm.xml
 
Politics n. Poly "many" + ticks "blood sucking insects". Tiny ad:
Java file APIs (DOC, XLS, PDF, and many more)
https://products.aspose.com/total/java
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!