在以下情況下如果發生失敗則如何回滾

Question

以下是根據一些約束將“書目表”，“學生表”和“保存”到“學生書”的映射的類。

class SaveMyDataService {
     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveBooks(List < Book > bookList) {

        /*
        some operation on bookList and then saving each Book Object individually
         */

    }
     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveStudent(List < Student > studentList) {

        /*
        some operation on studentList and then saving each Student Object individually
         */

    }

     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveStudentBookMapping() {

        List < Book > bookList = Book.getAll();
        List < Student > studentList = Studnet.getAll();

        for (int i = 0; i < studnetList.size(); i++) {
            StudentBookMapping obj = new StudentBookMapping();
            /*
            after some operation we map the Book & Student and save the StudentBookMapping Object
             */
            obj.save();
        }

    }

}

該服務類調用SaveMyDataService和其他服務的方法來獲取數據，然后在可能發生異常的情況下進行一些評估，在這種情況下，我希望回滾所有數據，例如Books，Students及其映射，但無法解決。

class FetchAllNewBooksAndStudent{

    def saveMyDataService;
    def xmlParsingSerivice;
    def evaluationService;

    getStudentAndBooksData()
    {
        try{
        /*
            Some IO operations to get the Student & Book List from XML
        */
        List<Student> studList = xmlParsing.getStudList();
        List<Book> bookList = xmlParsing.getBookList();

        // here we call the save book service
        saveMyDataService.saveBooks(bookList);

        // here we call the save Student service
        saveMyDataService.saveStudent(studList);


        // here we call the mapping service to map the Student & Books
        saveMyDataService.saveStudentBookMapping();

        /*
            after this I do some Evaluation operation but here might be chances of getting exception in such a case I want to rollback all the above entries made like books, student & their mapping but its not working out 
        */

        evaluationService.evaluate();


        }
        catch(Exception e)
        {
            log.error e.getMessage();
        }

    }
}

該作業每隔4小時運行一次，以檢查Student / Books / StudentBookMapping的新數據，並調用fetchAllNewBooksAndStudent類的getStudentAndBooksData服務

class RegularBookStudentCheckJob{

    def fetchAllNewBooksAndStudent;

    static triggers = {
        simple repeatInterval: Long.parseLong(ConfigHolder.config.REGULAR_BOOK_STUDENT_CHECK_JOB_REPEAT_INTERVAL), // here value is 4hrs
        startDelay : 60000
    }


    def execute(){

        if(String.valueOf(ConfigHolder.config.RUN_BOOK_STUDENT_CHECK_JOB).equalsIgnoreCase("true"))
        {
            fetchAllNewBooksAndStudent.getStudentAndBooksData();
        }

    }


}

在這里，我的問題是在評估失敗的情況下，我期望所有數據都完全回滾，但仍無法解決，請讓我知道我在哪里出錯。

在此先感謝您的幫助！

Answer 1

在調用save（）方法時，傳遞failOnError：true的參數，即； 保存（failOnError：true）