Java 更新表会从jsp页面中未绑定的列中删除数据
我有一个有很多列的表。当我使用@modeldattribute更新某些列时,jsp页面中未指定的列中的数据将被删除 范例Java 更新表会从jsp页面中未绑定的列中删除数据,java,hibernate,jsp,spring-mvc,Java,Hibernate,Jsp,Spring Mvc,我有一个有很多列的表。当我使用@modeldattribute更新某些列时,jsp页面中未指定的列中的数据将被删除 范例 @RequestMapping(value= "/studenteducation", method= RequestMethod.GET) public String setupUpdateEducationForm(Model model, @ModelAttribute("education") Student student){ student = stud
@RequestMapping(value= "/studenteducation", method= RequestMethod.GET)
public String setupUpdateEducationForm(Model model, @ModelAttribute("education") Student student){
student = studentService.getStudent(getStudentName());
model.addAttribute("education", student); //adding saved student data into model
return "studenteducation";
}
@RequestMapping(value= "/studenteducation", method= RequestMethod.POST)
public String studentEducationForm(Model model, @ModelAttribute("education") Student student, BindingResult result){
if(result.hasErrors()){
return "studenteducation";
}
student.setStudentId(getStudentName()); // inserting primary key
studentService.updateStudent(student); // updating student table
return "redirect:/";
}
问题是我没有绑定此更新中的所有列,因此只保留绑定列数据,而从数据库中删除其他列数据。我有15列,在这个jsp页面中绑定了5列
我的完整控制器代码:
@Controller
@RequestMapping("/user")
@SessionAttributes("education")
public class StudentController {
@Autowired
StudentService studentService;
Student student = new Student();
// Setup new Student form------------------------------------------------------------------
@RequestMapping(value= "/newuser", method= RequestMethod.GET)
public String setupAddStudentForm(Model model, @ModelAttribute("student") Student student){
return "registerstudent";
}
// Add new Student------------------------------------------------------------------
@RequestMapping(value= "/newuser", method= RequestMethod.POST)
public String sddStudent(Model model, @ModelAttribute("student") Student student, BindingResult result, SessionStatus sessionStatus){
if(result.hasErrors()){
return "registerstudent";
}
studentService.addStudent(student);
sessionStatus.setComplete();
return "redirect:/";
}
// Setup Edit Profile Form------------------------------------------------------------------
@RequestMapping(value= "/updateprofile", method= RequestMethod.GET)
public String setupStudentProfileForm(Model model, @ModelAttribute("profile") Student student ){
Student stu = studentService.getStudent(getStudentName());
model.addAttribute("name", student.getStudentId());
model.addAttribute("studentprofile", stu);
return "studentprofile";
}
// Update student profile------------------------------------------------------------------
@RequestMapping(value= "/updateprofile", method= RequestMethod.POST)
public String studentProfileForm(Model model, @ModelAttribute("profile") Student student, BindingResult result, SessionStatus sessionStatus ){
if(result.hasErrors()){
return "studentprofile";
}
student.setStudentId(getStudentName());
studentService.updateStudent(student);
sessionStatus.setComplete();
return "redirect:/";
}
// Setup Update Education Form------------------------------------------------------------------
@RequestMapping(value= "/studenteducation", method= RequestMethod.GET)
public String setupUpdateEducationForm(Model model, @ModelAttribute("education") Student student){
student = studentService.getStudent(getStudentName());
model.addAttribute("education", student);
return "studenteducation";
}
// Update Student Education------------------------------------------------------------------
@RequestMapping(value= "/studenteducation", method= RequestMethod.POST)
public String studentEducationForm(Model model, @ModelAttribute("education") Student student, BindingResult result, SessionStatus sessionStatus){
if(result.hasErrors()){
return "studenteducation";
}
student.setStudentId(getStudentName());
studentService.updateStudent(student);
sessionStatus.setComplete();
return "redirect:/";
}
我的学生模型id很大,我正在通过2个控制器进行更新。不同jsp页面中的学生配置文件和具有不同控制器的不同jsp页面中的教育。当我更新一部分时,另一部分会删除。这就是我的目的
在控制器类声明的顶部添加@SessionAttributes(“教育”)
在第一个方法中去掉@ModelAttribute(“教育”)Student
参数。将学生添加到该方法中的模型中
将SessionStatus
参数添加到POST处理程序方法中,并在完成后调用SessionStatus.setComplete()
你应该使用这个模式
如果不允许用户编辑此表单中的某些实体字段,则还应使用@InitBinder设置不允许的字段:
@InitBinder
public void setAllowedFields(WebDataBinder dataBinder) {
dataBinder.setDisallowedFields("foo");
}
这是SpringMVC和Hibernate协同工作的方式。当您在控制器方法un
@modeldattribute(“教育”)Student
中编写时,SpringMVC创建一个新对象并用表单数据填充它。所有其他字段保持其初始化值(通常为空)。
你可能会觉得这很愚蠢,但我从来没有在SpringMVC中找到一个好的、干净的方法来处理这个问题。常见的解决办法:
- 使用Neil McGuigan建议的
。问题在于,当您不再需要该属性时,该属性可以保持会话状态,并且显然不能用于无会话API使用SessionAttributes
- 在URL中传递id,并使用
将其转换为正确的转换器
对象。但是您必须在服务层之外调用持久性层李>学生