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JavaRanch » Java Forums » Databases » Object Relational Mapping
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Bad cascade

Mike Okri
Ranch Hand

Joined: Jun 22, 2011
Posts: 83
I have a many-to-many mapping between student and course and I have cascade="all" on the students-to-courses mapping as shown below. When I delete a student, hibernate cascades the delete to all of the students courses. My problem is that some of these deleted courses are also shared by other students. How do I ensure that deleting student_A will delete only courses that belong only to student_A and not courses that are shared with student_B.


Ogeh Ikem
Ranch Hand

Joined: May 13, 2002
Posts: 180
cascade="all", cascade="delete", and cascade="all-delete-orphans" should be avoided when dealing with many-to-many associations, or else, problems like this will arise.
 
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subject: Bad cascade
 
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