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我被困在问题上，我使用 spring MVC 和 spring-data 制作了一个正常的项目，其中我有 dao 层、服务层、控制器和视图层。在这个项目中，我有Department, employee,employeeproject桌子。当我删除部门时，对应的员工表列departmentId设置为空。所以这在从 UI 中删除部门时正确反映在数据库中，但是当我再次通过getALlEmployee按钮看到员工时，那时部门的先前值仍显示在UI 而不是值在数据库中为空。当我重新启动服务器时，值没有显示为什么会这样？

这是我在所有三层中的函数 getAllEmployee()

在 DAO 层

   /**
     * Get the all employee detail from the database
     * 
     * @return list of employees
     */
    @Override
    public List<Employee> getAllEmployees() {
        List<Employee> employeeList = employeeRepository.findAll(new Sort(
                Direction.ASC, "employeeNumber"));

        return employeeList;
    }

在服务层

    @Override
    public List<EmployeeBO> getAllEmployees() {
        List<EmployeeBO> employeeBOList = null;
        List<Employee> employeeList = employeeDAO.getAllEmployees();
        if (employeeList != null && employeeList.size() != 0) {
            employeeBOList = new ArrayList<EmployeeBO>();
            for (Employee employee : employeeList) {
                employeeBOList.add(convertEmployeeEntityToBO(employee));
            }
        }

     return employeeBOList;

并在控制器中

@RequestMapping(value = "/GetAllEmployee", method = RequestMethod.GET)
public ModelAndView getAllEmployee(
        @ModelAttribute("employeeBO") EmployeeBO employeeBO) {
    ModelAndView modelAndView = new ModelAndView();
    List<EmployeeBO> list = employeeService.getAllEmployees();
    modelAndView.addObject("employeeBO", employeeBO);
    modelAndView.addObject("listEmployeeBO", list);
    modelAndView.setViewName("EmployeeList");
    return modelAndView;
}

部门班波佐

    @Entity
@Table(name = "department")
public class Department extends BaseObject {

    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "DEPARTMENT_ID")
    private String departmentId;
    @Column(name = "DEPARTMENT_NAME")
    private String departmentName;
    @Column(name = "DEPARTMENT_LOCATION")
    private String departmentLocation;
    @OneToMany
    @JoinColumn(name = "DEPARTMENT_ID", insertable = false, updatable = false)
    Collection<Employee> employeeList = new ArrayList<Employee>();

员工波佐班

    @Entity
@Table(name = "employee")
public class Employee extends BaseObject {

    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "EMPLOYEE_NUMBER")
    private long employeeNumber;
    @Column(name = "FIRST_NAME")
    private String firstName;
    private String title;
    @Column(name = "DEPARTMENT_ID")
    private String departmentId;
    @Column(name = "MOBILE_NUMBER")
    private long mobileNumber;
    @Column(name = "DATE_OF_BIRTH")
    @Temporal(TemporalType.DATE)
    private Date dateOfBirth;

    @OneToMany(mappedBy = "employee", cascade = CascadeType.ALL, orphanRemoval = true)
    Collection<EmployeeProject> employeeProjectList = new ArrayList<EmployeeProject>();

这两个班级部门和员工 pozo 班级有 setter getter

部门仓库接口

    import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import com.nousinfo.tutorial.model.Department;

/**
 * Repository interface for {@link Department} instances. Provides basic CRUD
 * operations due to the extension of {@link JpaRepository}. Includes custom
 * implemented functionality by extending {@link JpaRepository}.
 * 
 * @author ankurj
 */
public interface DepartmentRepository extends JpaRepository<Department, String> {
    /**
     * Find all Department with the given department Name. This method will be
     * translated into a query by constructing it directly from the method name
     * as there is no other query declared.
     * 
     * @param name
     *            departmentName to be find
     * @return list of departments
     */
    public List<Department> findByDepartmentNameLike(String name);

    /**
     * 
     * update the employee with the given departmentId. This method will be
     * translated into a query using the one declared in the {@link Query}
     * annotation declared one.
     * 
     * @param departmentId
     *            departmentId to be set
     * @param deptId
     *            departmentId is to deleted
     * @return integer value
     */
    @Modifying
    @Query("UPDATE Employee set DEPARTMENT_ID = :departmentId WHERE DEPARTMENT_ID = :deptId")
    public int updateEmployeeDepartmentId(
            @Param("departmentId") String departmentId,
            @Param("deptId") String deptId);
}
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