spring启动，thymeleaf-delete按钮不工作

我试图创建一个功能性的delete按钮，使用自定义查询从数据库的表中删除一行。
我所做的每件事都会让我犯错误或无法工作。
存储库：

public interface ConsultationRepository extends Repository<Consultation, Integer> {

    @Modifying
    @Query("DELETE FROM Consultation c WHERE c.id =:id")
    @Transactional
    public String deleteConsultation(@Param("id") String consultationId);

    void save(Consultation consultation) throws DataAccessException;

    List<Consultation> findByChildId(Integer childId);

}

控制器：

@Controller
class ConsultationController {

    private final ConsultationRepository consultations;

    private final ChildRepository childs;

    public ConsultationController(ConsultationRepository consultations, ChildRepository childs) {
        this.consultations = consultations;
        this.childs = childs;
    }

    @InitBinder
    public void setAllowedFields(WebDataBinder dataBinder) {
        dataBinder.setDisallowedFields("id");
    }

    @ModelAttribute("consultation")
    public Consultation loadChildWithVisit(@PathVariable("childId") int childId, Map<String, Object> model) {
        Child child = this.childs.findById(childId);
        child.setConsultationsInternal(this.consultations.findByChildId(childId));
        model.put("child", child);
        Consultation consultation = new Consultation();
        child.addConsultation(consultation);
        return consultation;
    }

    @GetMapping("/parents/*/childs/{childId}/consultations/new")
    public String initNewConsultationForm(@PathVariable("childId") int childId, Map<String, Object> model) {
        return "childs/createOrUpdateConsultationForm";
    }

    @PostMapping("/parents/{parentId}/childs/{childId}/consultations/new")
    public String processNewConsultationForm(@Valid Consultation consultation, BindingResult result) {
        if (result.hasErrors()) {
            return "childs/createOrUpdateConsultationForm";
        }
        else {
            this.consultations.save(consultation);
            return "redirect:/parents/{parentId}";
        }
    }

    @RequestMapping(value = "/delete_consultation", method = RequestMethod.GET)
    public String handleDeleteConsultation(@RequestParam(name="consultationId") String consultationId) {
        consultations.deleteConsultation(consultationId);
        return "redirect:/parents";
    }

}

带thymeleaf的html:：

<!DOCTYPE html>

<html xmlns:th="https://www.thymeleaf.org"
  th:replace="~{fragments/layout :: layout (~{::body},'parents')}">

  <body>

    <h2>Informatii parinte</h2>

    <table class="table table-striped" th:object="${parent}">
      <tr>
        <th>Nume si prenume</th>
        <td><b th:text="*{firstName + ' ' + lastName}"></b></td>
      </tr>
      <tr>
        <th>Adresa</th>
        <td th:text="*{address}" /></td>
      </tr>
      <tr>
        <th>Orasul</th>
        <td th:text="*{city}" /></td>
      </tr>
      <tr>
        <th>Telefon</th>
        <td th:text="*{telephone}" /></td>
      </tr>
    </table>

    <a th:href="@{{id}/edit(id=${parent.id})}" class="btn btn-default">Actualizeaza informatii parinte</a>
    <a th:href="@{{id}/childs/new(id=${parent.id})}" class="btn btn-default">Adauga copil</a>

    <br />
    <br />
    <br />
    <h2>Copii si consultatii</h2>

    <table class="table table-striped">

      <tr th:each="child : ${parent.childs}">
        <td valign="top">
          <dl class="dl-horizontal">
            <dt>Nume si prenume</dt>
            <dd th:text="${child.name}" /></dd>
            <dt>Data nasterii</dt>
            <dd
              th:text="${#temporals.format(child.birthDate, 'yyyy-MM-dd')}" /></dd>
            <dt>Genul</dt>
            <dd th:text="${child.type}" /></dd>
          </dl>
        </td>
        <td valign="top">
          <table class="table-condensed">
            <thead>
              <tr>
                <th>Data consultatiei</th>
                <th>Descriere</th>
              </tr>
            </thead>
            <tr th:each="consultation : ${child.consultations}">
              <td th:text="${#temporals.format(consultation.date, 'yyyy-MM-dd')}"></td>
              <td th:text="${consultation?.description}"></td>

              <td><a
                  th:href="@{/delete_consultation(consultationId=${consultation.consultationId})}" 
                  class="btn btn-danger">
                  Sterge consultatie</a></td>

            </tr>
            <tr>
              <td><a
                th:href="@{{parentId}/childs/{childId}/edit(parentId=${parent.id},childId=${child.id})}">
                Actualizeaza informatii copil
                </a></td>
              <td><a
                th:href="@{{parentId}/childs/{childId}/consultations/new(parentId=${parent.id},childId=${child.id})}">
                Adauga consultatie</a></td>
            </tr>
          </table>
        </td>
      </tr>
    </table>
  </body>
</html>

我的方法不好？还是有其他更好的方法让它开始工作？

spring启动，thymeleaf-delete按钮不工作

暂无答案！

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