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hybernate doubt

sudha javvadi
Ranch Hand

Joined: Mar 23, 2007
Posts: 97
Hi all,

How to map a class with more than one table?If the data is in multiple tables then how to map those tables with a single class?

thanks,
Sudha.
Thirumurugan Sivaji
Greenhorn

Joined: Mar 03, 2009
Posts: 20
Hi,

Place as many classes as you want inside the hibernate mapping file as follows,
<hibernate-mapping>
<class name="event.Employee" table="employee">
<id name="id" >
<generator class="increment"></generator>
</id>
<property name="empId" column="EMP_ID"/>
<property name="empName" column="EMP_NAME"/>
<property name="empPwd" column="EMP_PASSWORD"/>
</class>
<class name="event.Employee" table="dept">
<id name="id" >
<generator class="increment"></generator>
</id>
<property name="empId" column="EMP_ID"/>
</class>
</hibernate-mapping>


Warm Regards,

Thirumurugan Sivaji

gopal ramana
Greenhorn

Joined: Feb 04, 2009
Posts: 2
Hi ,


Using the <join> element, it is possible to map properties of one class to several tables.

please refer Hibernate_reference.pdf 3.2 , page no:78


Warm Regards,
Ramana
Vikas Kapoor
Ranch Hand

Joined: Aug 16, 2007
Posts: 1374
Thirumurugan,

Please keep below points while replying.
Read The Question.
Use Code Tags.

It is not at all good practice to have more than one mapping into your mapping files. So each mapping file should contain only one class mapping.

sudha,

you can create two mapping files(*.hbm.xml) and put class mapping with same class name and different table name.
If you find any difficulties, you can always come back. Please show us some efforts.
 
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subject: hybernate doubt