sql约束违反异常

Question

我有一个由 MathematicsAnswer 引用的实体数学。如果对数学执行发布请求，我会得到 MathsAnswer 上的字段不能为空的异常。但我实际上确实在场上进行了级联。请我需要解决这个问题。 java.sql.SQLIntegrityConstraintViolationException: Column 'question_id' cannot be null

sql 架构：

CREATE TABLE MATHEMATICS(
id integer not null auto_increment,
year date not null,
question_no int not null,
question varchar(128) default null,
primary key(id)
) engine=InnoDb;

CREATE TABLE MATHS_ANSWER(
id integer not null auto_increment,
date date default null,
question_no int not null,
question_id int not null,
solution varchar(128) default null,
solution_url varchar(128) default null,
primary key(id),
foreign key(question_id) references MATHEMATICS(id) ON DELETE NO ACTION ON UPDATE NO ACTION
) engine = InnoDb;

实体类：

@Entity
        @Table(name = "Mathematics")
        public class Mathematics {

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private Integer id;
    
    @Column(name = "year")
    private Date year;
    
    @Column(name = "question_no")
    private Integer questionNo;
    
    @Column(name = "question")
    private String question;
    
    @OneToOne(mappedBy = "maths", fetch = FetchType.EAGER,cascade = CascadeType.ALL
            )
    private MathsAnswers answers = new MathsAnswers();//getters & setters

MathsAnswers.java：

 @Entity
            @Table(name = "Mathematics")
            public class Mathematics {
    
        @Id
        @Column(name = "id")
        @GeneratedValue(strategy = GenerationType.SEQUENCE)
        private Integer id;
        
        @Column(name = "year")
        private Date year;
        
        @Column(name = "question_no")
        private Integer questionNo;
        
        @Column(name = "question")
        private String question;
        
        @OneToOne(mappedBy = "maths", fetch = FetchType.EAGER,cascade = CascadeType.ALL
                )
        private MathsAnswers answers = new MathsAnswers();//getters & setters
            

jpaRepo：

@RepositoryRestResource(collectionResourceRel = "mathematics", path = "maths")
public interface MathsRepo extends JpaRepository<Mathematics, Integer> {

}

发布请求：

{
    "year":"2004-01-03",
    "questionNo":"4",
    "question":"How many weeks makes a year?"
}

Answer 1

为我的MathsAnswer 实体指定的表名错误；应该是 Mathsanswer 而不是 Mathematics。