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  • Hibernate异常:identifier of an instance of 错误

    今天写项目时,在使用hibernate封装的插入方法时,由于需要同时保存多个数据,导致出现identifier of an instance of

    如下代码 :(由于最大最小分数不同所以需要插入两条数据)

    ExamScoreDivide examScoreDivide=new ExamScoreDivide();
            ExamCourse examCourse=new ExamCourse();
            examCourse.setExamCourseId(examCourseId);
            
            Exam exam=new Exam();
            exam.setExamId(examId);
            
            
            examScoreDivide.setDivideId(StringUtil.getUuid());
            examScoreDivide.setMinScore(minScore1);
            examScoreDivide.setMaxScore(maxScore1);
            examScoreDivide.setExamCourse(examCourse);
            examScoreDivide.setExam(exam);
            examScoreDivide.setCreator(userInfo.getUserName());
            examScoreDivide.setCreateTime(DateUtil.currentDate());
            examScoreDivide.setDivideName(divideName);
            gradExamScoreDivideService.save(examScoreDivide);
    
    examScoreDivide.setDivideId(StringUtil.getUuid());
            examScoreDivide.setMinScore(minScore2);
            examScoreDivide.setMaxScore(maxScore2);
            examScoreDivide.setExamCourse(examCourse);
            examScoreDivide.setExam(exam);
            examScoreDivide.setCreator(userInfo.getUserName());
            examScoreDivide.setCreateTime(DateUtil.currentDate());
            examScoreDivide.setDivideName(divideName);
            gradExamScoreDivideService.save(examScoreDivide);

    但结果报该错误,后来知道了原因:

    报错的原因是,在没有给对象examScoreDivide 分配初始的内存地址的时候,就进行对象生成,不管生成多少个,都是多个对象的内存指针指向一个内存地址,所以hibernate在存储时就会保存。放在内存里面每次new就等一个新的内存空间,所以不会报错。

    解决后的代码:

    ExamScoreDivide examScoreDivide=new ExamScoreDivide();
    		ExamCourse examCourse=new ExamCourse();
    		examCourse.setExamCourseId(examCourseId);
    		
    		Exam exam=new Exam();
    		exam.setExamId(examId);
    		
    		
    		examScoreDivide.setDivideId(StringUtil.getUuid());
    		examScoreDivide.setMinScore(minScore1);
    		examScoreDivide.setMaxScore(maxScore1);
    		examScoreDivide.setExamCourse(examCourse);
    		examScoreDivide.setExam(exam);
    		examScoreDivide.setCreator(userInfo.getUserName());
    		examScoreDivide.setCreateTime(DateUtil.currentDate());
    		examScoreDivide.setDivideName(divideName);
    		gradExamScoreDivideService.save(examScoreDivide);
    		
    		
    		ExamScoreDivide examScoreDivide1=new ExamScoreDivide();
    		ExamCourse examCourse1=new ExamCourse();
    		examCourse1.setExamCourseId(examCourseId);
    		
    		Exam exam1=new Exam();
    		exam1.setExamId(examId);
    		
    		examScoreDivide1.setDivideId(StringUtil.getUuid());
    		examScoreDivide1.setMinScore(minScore2);
    		examScoreDivide1.setMaxScore(maxScore2);
    		examScoreDivide1.setExamCourse(examCourse1);
    		examScoreDivide1.setExam(exam1);
    		examScoreDivide1.setDivideName(divideName);
    		examScoreDivide1.setCreator(userInfo.getUserName());
    		examScoreDivide1.setCreateTime(DateUtil.currentDate());
    		gradExamScoreDivideService.save(examScoreDivide1);
    

      

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  • 原文地址:https://www.cnblogs.com/FanJava/p/8204136.html
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