更新方法struts 2-hibernate-jpa

Question

struts.xml 这是 Struts 类

请告诉我使用strut2 hibernate JPA 更新的正确方法关于按 id 更新

<struts>

<package name="com.Attendance" extends="struts-default">

    <action name="RegTeacher" class="com.Attendance.TeacherAction" >

    <result name="success">/Admin/success.jsp</result>

    <result name="error">/Admin/RegistrationTeacher.jsp</result>

    <result name="input">/Admin/RegistrationTeacher.jsp</result>

    </action>

    <action name="EditTeacher" class="com.Attendance.TeacherAction" 

    method="FindById">

    <result name="success">/Admin/UDTeacher.jsp</result>

    <result name="input">/Admin/ShowAllTeacher.jsp</result>

    </action>

    <action name="UDTeacher" class="com.Attendance.TeacherAction" 

    method="Update">

    <result name="success">/Admin/success.jsp</result>

    <result name="error">/Admin/UDTeacher.jsp</result>

    <result name="input">/Admin/UDTeacher.jsp</result>

    </action>

   </package>

   <constant name="struts.action.excludePattern" 

   value="/CheckCode,/CheckRegistrationAdmin," />

  </struts>`

RegTeacher 这是模型/实体类

请告诉我用strut2 hibernate JPA更新的正确方法关于按id更新

  ` package com.Attendance;

   import javax.persistence.*;

   @Entity

   @Table(name="Teacher")

   public class RegTeacher{

   @Id

   @GeneratedValue(strategy=GenerationType.AUTO)

   @Column(name = "id", nullable = false)

   private int id;

   @Column(name = "LecturerName",unique=true,nullable=false)

   private String Name;

   @Column(name= "email",unique=true,nullable=false)

   private String email;

   @Column(name= "pass",nullable=false)

   private String Password;

   @Column(name="Course",nullable=false)

   private String CourseT;

   @Column(name= "ClassName",nullable=false)

   private String CName;

 /** setter and getter **/

  }`

TecaherAction 这是 Action 类

Answer 1

从错误中可以清楚地看出Duplicate entry 'Rajan' for key 'LecturerName'，您尝试的实体Update被视为重复。原因是每次都调用execute方法来保存实体而不是更新它。TeacherAction您的问题的解决方案是调用动作类的特定（特定于 jsp 页面）方法。尝试在UpdateTeacher.jsp中添加以下代码行<s:form action="RegTeacher" method="Update" theme="simple" >提示：我建议遵循编码标准，使每个人都可以轻松跟踪和理解代码。