使用struts2时如何设置操作链接以删除从表中加载的表中的行 [英] How to setup an action link to delete the row from the table loaded from the table when using struts2

问题描述

我想从存储在数据库中的表中永久删除一行，该表正在显示在 jsp 页面上.我有一个链接 Delete(对于每一行)，只需单击一下即可删除该行.

I want to delete a row persistently from a table stored in the database which is being displayed on the jsp page. I have a link Delete (for each row) to delete the row on a single click.

我的jsp代码是:

    <s:iterator value="topperList" >
      <tr>
         <td><s:property value="uid"/></td>
         <td><s:property value="name"/></td>
         <td><s:property value="password"/></td>
         <td><s:property value="sex" /></td>
         <td><s:property value="age" /></td>
         <td><s:property value="city" /></td>
         <td><s:property value="abuse" /></td>
         <td><s:property value="lastlogin" /></td>
         <td><s:property value="points" /></td>
         <td><s:property value="joined" /></td>
         <td><s:property value="email" /></td>
         <s:url id="url" action="delete" >
           <s:param name="uid"><s:property value="uid" /></s:param>
         </s:url>
         <td><s:a href="%{url}">Delete</s:a></td>
      </tr> 
  </s:iterator>

我的动作类代码是:

private Integer uid;

public Integer getUid() {
    return uid;
}

public void setUid(Integer uid) {
    this.uid = uid;
}
public String delete() {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Users user = (Users) session.load(Users.class, this.getUid());
        if (null != user) {
            session.delete(user);
        }
        session.getTransaction().commit();
           return SUCCESS;
    }

struts.xml 中的动作代码:

action code in struts.xml :

<action name="delete" class="com.rambo.action.FindToppers" method="delete" >
        <result name="success">buser.jsp</result>
    </action>

但我得到了错误:

org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [beans.Users#0]

我看到表 USERS 中有一个适当的行，uid=56.但它显示没有具有标识符的行存在.但是我没有收到任何服务器错误日志.有人能指出可能是什么问题吗?

I have seen there is a proper row in table USERS with uid=56. But it shows No row with the identifier exists. However i am not getting any server error logs. Can some one point out what can be the problem.

推荐答案

我想我看到了问题所在.问题是动作中的属性cid是null(你可以做一个System.out.println(cid)).如果 null 被打印，您可能必须使用 ParameterAware 来捕获 url 参数.

I think I see the problem. The problem is that the attribute cid in the action is null (you can do a System.out.println(cid)). If null is printed probably you will have to catch the url parameters with ParameterAware.

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