spring JPA逐步保存实体

这里是实体类

 

package aop.web.teacher.rmodels; 
// Generated 11 Feb, 2011 3:57:41 PM by Hibernate Tools 3.2.2.GA 


import java.util.Date; 

import java.util.HashSet; 

import java.util.Set; 

import javax.persistence.CascadeType; 

import javax.persistence.Column; 

import javax.persistence.Entity; 

import javax.persistence.FetchType; 

import javax.persistence.Id; 

import javax.persistence.JoinColumn; 

import javax.persistence.ManyToOne; 

import javax.persistence.OneToMany; 

import javax.persistence.Table; 

import javax.persistence.Temporal; 

import javax.persistence.TemporalType; 


import org.hibernate.validator.constraints.NotEmpty; 

/** 
* AopTeacherMaster generated by hbm2java 
*/ 
@Entity 
@Table(name="aop_teacher_master" 
    ,schema="public" 
) 
public class AopTeacherMaster implements java.io.Serializable { 


    private long id; 
    private AopTeachersDistrictMaster aopTeachersDistrictMasterByCurrDistrict; 
    private AopInstitutionmaster aopInstitutionmaster; 
    private AopTeachersDistrictMaster aopTeachersDistrictMasterByPermDistrict; 
    @NotEmpty(message="Fathers name is mandatory") 
    private String fathersName; 
    @NotEmpty 
    private String currAddLine1; 
    private String currAddLine21; 
    private String currAddLine22; 
    private String currAddLine3; 
    private String currDevelopmentBlock; 
    private String currPoliceStation; 
    private String currCity; 
    private String currPin; 
    private String currState; 
    private String currCountry; 
    private String permAddLine1; 
    private String permAddLine21; 
    private String permAddLine22; 
    private String permAddLine3; 
    private String permDevelopmentBlock; 
    private String permPoliceStation; 
    private String permCity; 
    private String permPin; 
    private String permState; 
    private String permCountry; 
    private Date dateOfBirth; 
    private Character gender; 
    private Character maritalStatus; 
    private String religion; 
    private String caste; 
    private String landLineNumber; 
    private String mobileNumber; 
    private String email; 
    private String uidNum; 
    private String bankName; 
    private String bankBranch; 
    private String bankAccountNum; 
    private String gpfNum; 
    private Set aopTeachersSanctionedPostDetailsForCurrentIncumbentId = new HashSet(0); 
    private Set aopTeachersSanctionedPostDetailsForFirstIncumbentId = new HashSet(0); 

    public AopTeacherMaster() { 
    } 


    public AopTeacherMaster(long id) { 
     this.id = id; 
    }

现在我有一个2步向导等的过程，其中在第一屏幕用户输入的一些实体和实体的属性的被合并的概述，在第二步中，补充或剩余的属性被填充。

我使用的是spring 3基于注解的控制器，我使用实体类作为命令对象。

在第一个去实体获取与屏幕一个值，然后我发送合并的引用作为第二个屏幕的命令对象。

但是，第二个屏幕似乎填充了那里的条目，但是取消了第一个屏幕上的现有属性。

这里是相同

 

    @RequestMapping(value = "/insertteacher.html", method = RequestMethod.POST) 
    public 
    String testEm(@Valid AopTeacherMaster teacher, BindingResult result, 
      Map model) { 
     logger.info("Checking Teacher for error"); 
     if (result.hasErrors()) { 
      logger.info("User data has:" + result.getErrorCount() + " errors!"); 
      // //////////////////// 

      for (Object object : result.getAllErrors()) { 
       if (object instanceof FieldError) { 
        FieldError fieldError = (FieldError) object; 

        logger.error("Error on field::" + fieldError.getField() 
          + " || error type ::" + fieldError.getCode()); 
       } 

      } 
      model.put("smessage", "There was an error"); 
      return "teachersmasterInsert"; 
     } 
     logger.info("Attemped saving!"); 
     teacher=schoolMasterService.add(teacher);//recieved the reference after merge! Will be used for command object in the next screen 
     model.put("teacher", teacher);//This is the command object for second screen 
     model.put("smessage", "teacher inserted successfully"); 
     return "teachersmasterInsert2"; 

     // List myList=testDaoService.findAllTeachers(); 
     // for(Teachermaster t:myList){logger.info("Got::"+t.getId());} 

    } 


    @RequestMapping(value = "/insertteacher2.html", method = RequestMethod.POST) 
    public 
    String testEm2(@Valid AopTeacherMaster teacher, BindingResult result, 
      Map model) { 
     logger.info("Checking Teacher for error second insert"); 
     if (result.hasErrors()) { 
      logger.info("User data has:" + result.getErrorCount() + " errors!"); 
      // //////////////////// 

      for (Object object : result.getAllErrors()) { 
       if (object instanceof FieldError) { 
        FieldError fieldError = (FieldError) object; 

        logger.error("Error on field::" + fieldError.getField() 
          + " || error type ::" + fieldError.getCode()); 
       } 

      } 
      model.put("smessage", "There was an error"); 
      return "teachersmasterInsert"; 
     } 
     logger.info("Attemped saving!"); 
     teacher=schoolMasterService.add(teacher); 
     model.put("teacher", teacher); 
     model.put("smessage", "teacher second instance inserted successfully"); 
     return "teachersmasterInsert"; 

     // List myList=testDaoService.findAllTeachers(); 
     // for(Teachermaster t:myList){logger.info("Got::"+t.getId());} 

    }

这是做了正确的方式，控制器代码？否则我该如何实现这种增量保存？请建议！在此先感谢。

来源

2011-04-06 nightfly

以实现基于注解控制器向导的典型方法是将部分构造的对象存储在会话，只剩下最后一步后，将其保存：

@Controller 
// Model attribute with name "aopTeacherMaster" is transparently stored in the session 
@SessionAttribute("aopTeacherMaster") 
public class TeacherController { 
    ... 

    @RequestMapping(value = "/insertteacher2.html", method = RequestMethod.POST) 
    public String testEm2(@Valid AopTeacherMaster teacher, BindingResult result, Map model) { 
     ... 
     // No need to save teacher here 
    } 

    @RequestMapping(value = "/insertteacherLast.html", method = RequestMethod.POST) 
    public String testEmLast(@Valid AopTeacherMaster teacher, BindingResult result, 
     Map model, SessionStatus status) { 
     ... 
     // Save teacher at the last step 
     teacher=schoolMasterService.add(teacher); 
     // Remove it from the session 
     status.setComplete(); 
    } 
}

或者，如果你真的需要增量保存一些原因，您可以从数据库加载实体的当前状态，并手动从模型对象的数据复制字段。

来源

2011-04-06 07:28:15 axtavt

spring JPA逐步保存实体

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