mysql - 尝试在 Spring Boot 中更新时间表时出错

我是 Spring Boot Ad 的新手，目前正在从事时间表生成支持项目。添加时间表在我的系统中正常工作，现在我想更新时间表。但是，当我尝试加载 upadteTimeTableView 时，它显示错误

org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/updateTimeTable.html]") Caused by: org.attoparser.ParseException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "updateTimeTable" - line 18, col 46)

updateTimeTable Thymeleaf View

    <!DOCTYPE html>
<html xmlns:th="https://www.thymeleaf.org">
<head>
    <link rel="stylesheet" type="text/css" href="static/css/timeTableMapping.css" th:href="@{/css/timeTableMapping.css}">
    <meta charset="UTF-8">
    <title>Update Time Table</title>
</head>
<body>



</form>
<div class="container2">
    <form action="#" th:action="@{/timeTableMapping/saveAll}" th:object="${timeTableMapping}" method="post">
        <table border="0" cell[adding="10">
            <tr>
                <td><h1>Time Table:</h1></td>

                <td>
                    <select th:field="*{time_table_code}">
                        <option value="">Choose..</option>
                        <option th:each="timeTable: ${timeTables}" th:value="${timeTable.name}" th:text="${timeTable.name}"/>
                    </select>
                </td>
            </tr>
        </table>

        <table border="1" >
            <thead>
            <tr>
            </tr>
            <br>
            <th></th>
            <th>Monday</th>
            <td style="background-color: cornflowerblue;"></td >
            <td style="background-color: cornflowerblue;"></td>
            <td style="background-color: cornflowerblue;"></td>
            <th>Tuesday</th>
            <td style="background-color: cornflowerblue;"></td >
            <td style="background-color: cornflowerblue;"></td>
            <td style="background-color: cornflowerblue;"></td>
            <th>Wednesday</th>
            <td style="background-color: cornflowerblue;"></td >
            <td style="background-color: cornflowerblue;"></td>
            <td style="background-color: cornflowerblue;"></td>
            <th>Thursday</th>
            <td style="background-color: cornflowerblue;"></td >
            <td style="background-color: cornflowerblue;"></td>
            <td style="background-color: cornflowerblue;"></td>
            <th>Friday</th>
            <td style="background-color: cornflowerblue;"></td >
            <td style="background-color: cornflowerblue;"></td>
            <td style="background-color: cornflowerblue;"></td>



            </thead>
            <tbody>

            <th:block th:each="time : ${times}">
                <tr>

                    <th th:text="${ time.start }+':00 - ' + ${ time.end }+':00'"></th>

                    <th:block th:each="day : ${days}">
                        <td>
                            <select th:field="*{subject_code}">
                                <option value=""></option>
                                <option th:each="subject: ${subjects}" th:value="${subject.subject_code}" th:text="${subject.name}"/>
                        <td><input type="text"  th:value="${day.name}" name="day" style="display:none;width:0px" /></td>
                        <td><input type="text"  th:value="${time.start}" name="start" style="display:none;width:0px" /></td>
                        <td><input type="text"  th:value="${time.end}" name="end" style="display:none;width:0px" /></td>


                        </select>
                        </td>
                    </th:block>

                </tr>


            </th:block>

            <tr>
                <td colspan="2">
                    <button type="submit">Save</button>
                </td>
            </tr>

            </tbody>
        </table>
    </form>
</div>

</body>
</html>

timeTableMapping 模型

@Entity
@Table(name="timetablemappings")
@EntityListeners(AuditingEntityListener.class)
public class TimeTableMapping {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String day;
    private String start;
    private String end;
    private String subject_code;
    private String time_table_code;

    public TimeTableMapping () {
    }





    public TimeTableMapping(String day, String start, String end, String subject_code, String time_table_code) {
        this.day = day;
        this.start = start;
        this.end = end;
        this.subject_code = subject_code;
        this.time_table_code = time_table_code;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getDay() {
        return day;
    }

    public void setDay(String day) {
        this.day = day;
    }

    public String getStart() {
        return start;
    }

    public void setStart(String start) {
        this.start = start;
    }

    public String getEnd() {
        return end;
    }

    public void setEnd(String end) {
        this.end = end;
    }

    public String getSubject_code() {
        return subject_code;
    }

    public void setSubject_code(String subject_code) {
        this.subject_code = subject_code;
    }

    public String getTime_table_code() {
        return time_table_code;
    }

    public void setTime_table_code(String time_table_code) {
        this.time_table_code = time_table_code;
    }
}

timeTableMapping Controller

@Controller
public class TimeTableMappingController {
    @Autowired
    private  TimeTableMappingDAO timeTableMappingDAO;

    @Autowired
    private TimeTableDAO timeTableDAO;

    @Autowired
    private SubjectDAO subjectDAO;

    @Autowired
    private StudentGroupDAO studentGroupDAO;

    @Autowired
    private DayDAO dayDAO;

    @Autowired
    private TimeDAO timeDAO;



    @RequestMapping("/timeTableMapping")
    public String viewHomePage(Model model){
        List<TimeTableMapping> timeTableMappingDetails= timeTableMappingDAO.findAll();
        model.addAttribute("timeTableMappingDetails",timeTableMappingDetails);
        return "timeTableMapping";
    }


    @RequestMapping(value="/timeTableMapping/saveAll",method= RequestMethod.POST)
    public String saveTimeTable(@ModelAttribute("timeTableMapping") TimeTableMapping timeTableMapping){

        String[] dayArray = timeTableMapping.getDay().split(",");
        String[] subArray = timeTableMapping.getSubject_code().split(",");
         String[] startArray = timeTableMapping.getStart().split(",");
        String[] endArray = timeTableMapping.getEnd().split(",");

        String[] uniqueDay = Arrays.stream(dayArray).distinct().toArray(String[]::new);
        String[] uniqueStart = Arrays.stream(startArray).distinct().toArray(String[]::new);
        String[] uniqueEnd = Arrays.stream(endArray).distinct().toArray(String[]::new);


        List<TimeTableMapping> tempList = new ArrayList<>();
        int count=0;
        for(int j=0;j<uniqueStart.length;j++) {

            for(int i = 0 ; i < uniqueDay.length; i++) {
                TimeTableMapping tempTimeTable = new TimeTableMapping();
                tempTimeTable.setStart(uniqueStart[j]);
                System.out.println(uniqueStart[j]);

                tempTimeTable.setEnd(uniqueEnd[j]);
                tempTimeTable.setTime_table_code(timeTableMapping.getTime_table_code());
                tempTimeTable.setDay(uniqueDay[i]);
                tempTimeTable.setSubject_code(subArray[count]);
                tempList.add(tempTimeTable);
                count++;

            }
        }

        timeTableMappingDAO.saveAll(tempList);
        return  "redirect:/timeTableMapping";
    }


    @RequestMapping("/timeTableMapping/new")
    public String addTimeTableMapping(Model model){
        System.out.println("hey");
        System.out.println("hey");
        TimeTableMapping timeTableMapping =new TimeTableMapping();
        model.addAttribute("timeTableMapping",timeTableMapping);

        List<TimeTable> timeTableDetail = timeTableDAO.findAll();
        model.addAttribute("timeTables", timeTableDetail);

        List<Subject> subjectDetail = subjectDAO.findAll();
        model.addAttribute("subjects", subjectDetail);

        List<Day> dayDetails = dayDAO.findAll();
        model.addAttribute("days",dayDetails);

        List<Time> timeDetails = timeDAO.findAll();
        model.addAttribute("times",timeDetails);

        return "addTimeTableMapping";
    }


    @RequestMapping("/timeTableMapping/edit/{id}")
    public ModelAndView updateTimeTable(@PathVariable(name="id")Long id){
        ModelAndView mav=new ModelAndView(("updateTimeTableMapping"));

        //mav.addObject("timeTableMapping", new TimeTableMapping());

        TimeTableMapping timeTableMapping = timeTableMappingDAO.findById(id);
        mav.addObject("timeTableMapping",timeTableMapping);

        List<TimeTable> timeTableDetails = timeTableDAO.findAll();
        mav.addObject("timeTables", timeTableDetails);

        List<Subject> subjectDetails = subjectDAO.findAll();
        mav.addObject("subjects", subjectDetails);

        List<StudentGroup> studentGroupDetails = studentGroupDAO.findAll();
        mav.addObject("studentGroups",studentGroupDetails);

        List<Day> dayDetails = dayDAO.findAll();
        mav.addObject("days",dayDetails);

        List<Time> timeDetails = timeDAO.findAll();
        mav.addObject("times",timeDetails);

        return  mav;
    }

    @RequestMapping("/timeTableMapping/delete/{id}")
    public String deleteProduct(@PathVariable(name="id") Long id){
        timeTableDAO.delete(id);
        return  "redirect:/timeTable";
    }
}

timeTableMappingDAO

@Service
public class TimeTableMappingDAO {

    @Autowired
    TimeTableRepository timeTableRepository;

    @Autowired
    TimeTableMappingRepository timeTableMappingRepository;


    //to save a time table
    public TimeTableMapping save(TimeTableMapping timeTableMapping){
        return timeTableMappingRepository.save(timeTableMapping);
    }


    public void saveAll(List<TimeTableMapping> timeTableMapping){
        timeTableMappingRepository.saveAll(timeTableMapping);
    }

        //to search all 
    public List<TimeTableMapping> findAll(){
        return timeTableMappingRepository.findAll();
    }

    //get a machine by id
    public TimeTableMapping findById(Long id){
        return timeTableMappingRepository.findById(id).orElse(null);
    }


    //delete
    public void delete(Long id){
        timeTableMappingRepository.deleteById(id);
    }


}

timeTableMapping 存储库

@Repository
public interface TimeTableMappingRepository extends JpaRepository<TimeTableMapping, Long> {
}

这是请求 http://localhost:8080/timeTable/edit/919

更新1

错误是语法错误，已正确更新文件。感谢所有试图提供帮助的人

最佳答案

我已经看到了你的堆栈跟踪并找到了该行

省略了 89 个公共(public)框架原因是:java.lang.IllegalStateException:BindingResult 和 bean 名称“timeTableMapping”的普通目标对象都不能作为 org.springframework.web.servlet.support.BindStatus 的请求属性。(BindStatus.java: 153) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

这里的问题是您将一个对象绑定(bind)到表单，您没有通过 Controller 传递或传递空对象。也许指定的 id 在数据库中不可用，因此从您调用此页面的任何位置都可以添加一个空对象，如下所示

1) 如果您使用 ModelAndView 类，则只需在 modelAndView 中添加一个空对象 modelAndView.addObject("timeTableMapping", new TimeTableMapping());

2)如果您使用模型类，则只需在模型中添加一个空对象
model.addAttribute("timeTableMapping", new TimeTableMapping());

关于mysql - 尝试在 Spring Boot 中更新时间表时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58281672/

mysql - 尝试在 Spring Boot 中更新时间表时出错

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