@ManyToMany java spring boot

Question

这是学生实体

@Entity
@Table(name = "STUDENTS")
public class Student extends BaseEntity {

  @Column(name = "student_index")
  public String index;
  public String firstName;
  public String lastName;
  @ManyToMany
  public List<Course> courses;
}

这是课程实体

@Entity
@Table(name = "COURSES")
public class Course extends BaseEntity {

  public String name;
  @ManyToMany
  public List<Student> students;

}

在DataBase中将生成哪些表？

Answer 1

必须有表STUDENTS、COURSES、STUDENTS_COURSES、COURSES_STUDENTS

@ManyToMany将会被混淆，并将创建两个表STUDENTS_COURSES、COURSES_STUDENTS

为了避免这种情况，需要提供选项mappedBy ie。@ManyToMany(mappedBy = "STUDENTS")它将只创建一个表STUDENTS_COURSES