动态读取记录而不使用getter [英] fetch records dynamically without getter

问题描述

我使用struts2框架动态地获取记录。
例如。
考试1有6个科目。
ExamId 2有8个科目。
考试3有2个科目。
等
但问题是我没有getSubject1（）setSubject1（）..... getSubjectN（）setSubjectN（）

<
现在的问题是我应该如何检索它，而不是setter和getters.I使用JQuery Jtable
reference： http://www.simplecodestuffs.com/crud-operations-in-struts-2 -using-jtable-jquery-plugin-via-ajax /

My Bean class

 @Entity 
 public class SubjectBean 
 {
 @Id 
 @GeneratedValue 
 private int SubjectId; 
 private String paperCode; 
 int totalNumber; 
 
 @OneToMany（cascade = CascadeType.ALL）
私人收藏< Subject> subjectList; 
 
 private int examId; 
 //所有
的setter和getters 
 
 
 $ b 
 Subject class 
  @Entity 
 public class Subject 
 {
 @Id 
 @GeneratedValue 
 private int Id; 
 private String subjectId; 
 private int capacity; 
 // setters and getters 
} 
  
动作类别。
  class CrudAction 
 {
 public String insert（）throws IOException 
 {
 
 String examid =（String）httpSession.getAttribute（examId）; 
 Integer examId = Integer.parseInt（examid）; 
 
地图< String，String []> requestParams = request.getParameterMap（）; 
 
 //使用hibernate插入数据
 
返回success; 
} 
 punlic String getAll（）
 {
 //我怎样才能访问？ 
 
 
 
 $ div $解析方案

你忽略了Struts2和OGNL的基本面。这是 XY问题的完美案例。

你需要的唯一东西就是集合/列表的getter和setter，显然必须在类级别而不是方法级别声明，否则一旦方法执行结束，它就会被销毁。因为在你的情况下，Collection / List在另一个对象内，那么这个对象必须在类级别声明，你也需要getter / setter：

  class CrudAction {
 private SubjectBean sb; 
 // getter和setter 
  

另外使用List来排序并使用 []符号和点符号以在IteratorStatus对象的帮助下在页面中指定它

 < s：iterator value =sb.subjectListstatus =ctr> 
    < / s：iterator> 
  

I am fetching records dynamically using struts2 framework. eg. ExamId 1 has 6 subject. ExamId 2 has 8 subject. ExamId 3 has 2 subject. etc. but the problem is i dont have getSubject1() setSubject1().....getSubjectN() setSubjectN()

[EDITED] Now issue is how should i retreive it wihtout setters and getters.I am using JQuery Jtable reference : http://www.simplecodestuffs.com/crud-operations-in-struts-2-using-jtable-jquery-plugin-via-ajax/

My Bean class

 @Entity
public class SubjectBean
{
 @Id
 @GeneratedValue
 private int SubjectId;
 private String paperCode;
 int totalNumber;

 @OneToMany(cascade=CascadeType.ALL)
 private Collection<Subject> subjectList;

 private int examId;
     //setters and getters of all
}

Subject class

   @Entity
public class Subject
{
 @Id
 @GeneratedValue
 private int Id;
 private String subjectId;
 private int capacity;
  //setters and getters
}

action class.

class  CrudAction
{
 public String insert() throws IOException
 {

    String examid =(String) httpSession.getAttribute("examId");
    Integer examId =Integer.parseInt(examid);

    Map<String, String[]> requestParams = request.getParameterMap();

    //inserting data using hibernate

     return "success";
 }
 punlic String getAll()
 {
       // how can i access?
  }
}

解决方案

You are ignoring fundamentals of both Struts2 and OGNL. And this is a perfect case of the XY problem.

The only things you need are the getter and the setter for the Collection/List, that obviously must be declared at class level, not method level, or it'll be destroyed once the method execution is over. Since in your case the Collection/List is inside another object, then that object must be declared at class level, and you will need getter/setter for it too:

class CrudAction {
    private SubjectBean sb;
    // getter and setter

Also use a List to have order and use the [] notation and the dot notation to specify it in page, with the help of IteratorStatus object

<s:iterator value="sb.subjectList" status="ctr">
    <s:property value="sb.subjectList[%{#ctr.index}].id" />
    <s:hidden    name="sb.subjectList[%{#ctr.index}].id" />
    <s:textfield name="sb.subjectList[%{#ctr.index}].subjectId" />
    <s:textfield name="sb.subjectList[%{#ctr.index}].capacity" type="number" />
</s:iterator>

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