java - JPQl 查询有错误

Question

Query query=entityManager.createQuery("Select e from StudentQualification e where e.student=:id");
@Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private Integer id;
    @ManyToOne
    @JoinColumn(name="student_id")
    private Student student;
    @ManyToOne
    @JoinColumn(name="qualification_type")
    private QualificationType qualificationType;
    @Column(name="obtain_marks")
    private Integer obtainMarks;
    @Column(name="total_marks")
    private Integer totalMarks;
    @Column(name="institute")
    private String institute;
    @Column(name="year_of_completion")

查询执行时出错:参数值 [1] 与预期类型不匹配 [com.autosoft.fortune.model.Student (n/a)] 我的查询在上面，之后我的类属性我应该做什么

Answer 1

i am also doing this"query.setParameter("id", studentId);" in my next line of code

查看您的 SQL 是什么:

 Select e from StudentQualification e where e.student=:id"
                                            ^^^^^^^^^

e.student 的类型为 Student private Student student;而不是简单的整数。

因此，请为学生对象提供填充的 id 来进行查询，而不是 id。