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我正在使用播放框架 2.0 和 Intellij。我试图让用户上传一个文档，然后将其保存为 Oracle 数据库中的 blob 对象。我正在使用 play 的方法从用户那里获取文件。然后在控制器中，我将它发送到模型类，我将文件保存在数据库中。问题是“附件”字段在保存到数据库时始终为空，我不知道为什么。我尝试将文件对象读取为字节字符串，然后将其转换为 blob 对象（我还将附件字段转换为 Blob 类型），但该 blob 对象也是空的。我怎样才能做到这一点？

//控制器代码 

public  static Result ValidateQuestion() {
    Form<Questions> filledForm = questionForm.bindFromRequest();

    if (filledForm.hasErrors()) {
        return badRequest(createQuestion.render(questionForm,fillCourseList(),fillSemesterList()));
    }
    else {
        Http.MultipartFormData body = request().body().asMultipartFormData();
        Http.MultipartFormData.FilePart attachment = body.getFile("attachment");
        if(attachment!=null) {
            Attachmenttable.create(1, "other", attachment.getFile());
        }
        return redirect(routes.TeacherController.TeacherDashboard());
    }

}

//模型类代码

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator = "s_attachmenttable")
public int attachment_id;

@Constraints.Required
public int question_id;

@Constraints.Required
public String name;

@Transient
public File attachment;

public Attachmenttable(int spurning_id, String name, File attachment) {
    this.spurning_id = spurning_id;
    this.nafn = nafn;
    this.vidhengi = vidhengi;
}

public static Attachmenttable create(int question_id, String name, File attachment) {

  Attachmenttable attachmenttable = new Attachmenttable(question_id, name, attachment);
    attachmenttable.save();
    return attachmenttable;
}
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