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Parent/Child problem

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kumarhanu

Post subject: Parent/Child problem

Posted: Mon Sep 04, 2006 9:32 am

Newbie

Joined: Mon Sep 04, 2006 9:26 am
Posts: 2

I have two tables: first table contains course,unit,lesson details.
second table contains many-to-one relationship between course and units. It means a course contains many units and a unit contains many lessons.

First Table:

Id content content
Name Type
1 course1 course
2 lesson1 lesson
3 lesson2 lesson
4 unit1 unit
5 unit2 unit

Second Table:

Id refId
2 1
3 1
4 2
5 2

For this scenario, how to write hbm file and mapping java class files.

Any help would be greatly appreciated.

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cmarques

Post subject:

Posted: Mon Sep 04, 2006 3:54 pm

Newbie

Joined: Mon Sep 04, 2006 12:24 pm
Posts: 1

Although you mentioned parent/child and one-to-many relationships, this looks like a regular many-to-many relationship.

The mapping would be something like:

Code:

<set name="units" lazy="true" table="table2">
            <key column="courseId"/>
            <many-to-many class="Unit" column="unitId"/>
</set>

Have a look at the online documentation, they have many examples.

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