June 2018
Intermediate to advanced
596 pages
12h 39m
English
Content preview from Java EE 8 Development with Eclipse - Third Edition
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Configuring many-to-many relationships
We will now configure Course and Student entities for a many-to-many relationship (a course can have many students, and one student can take many courses).
Many-to-many relations could be unidirectional or bidirectional. For example, you may only want to track students enrolled in the courses (so the Course entity will have a list of students) and not students taking the courses (the Student entity does not keep a list of courses). This is an unidirectional relationship where only the Course entity knows about the students, but the Student entity does not know about the courses).
In a bidirectional relationship, each entity knows about the other one. Therefore, the Course entity will keep a list of students ...
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