Spring Data JPA 创建Entity实体 @OneToMany

@OneToMany注解有mapperedBy字段

@ManyToOne注解没有mapperedBy字段

Student类

@Entity
@Table(name="student")
@Data
public class Student {
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Long id;
	
	@Column(name="name")
	private String name;
	
	@Column(name="age")
	private Integer age;
	
	//JoinColumn注解中name指的是实体对应表中的字段名，
	//该字段对应的是Clazz类
	@ManyToOne
	@JoinColumn(name="yourClazz")
	private Clazz myClazz;
}

 Clazz类

@Entity
@Table(name="clazz")
@Data
public class Clazz {
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Long id;
	
	@Column(name="name")
	private String name;
	
	//mappedBy的值为Student类中 Clazz类型变量的变量名
	@OneToMany(mappedBy="myClazz")
	private Set<Student> students;
}