Hibernate One-to-many and Many-to-one

Think, and many to one is the foreign key to the other side of the primary key, such as the student's foreign key to the teacher's primary key ID, so just aggregate a teacher object properties. That's it.

One-to-many is the primary key to the other side of the foreign key, such as the teacher ID on the student's foreign key Teacherid, the department ID of the employee's foreign key deptid, so is to increase the Set property, which is the teacher's collection. This is a one-to-many

　　

　　

This How to remember, many to one is the foreign key to others primary key, the foreign key can be more than one field, so is ' more '. One-to-many is the primary key to others foreign key, and the primary key only a field, so is ' one '

　　

Multi-and outside

One-to-master

　　

　　

Hibernate One-to-many and Many-to-one