0
私はこのリンクhttp://www.tutorials4u.net/struts2-tutorial/struts2_crud_example.htmlを使用してレコードを更新しようとしていますが、更新する代わりに新しいレコードを挿入しています。私はすでにから多くのことをしようとしたとして、それらのどれも私のために働いていないが、この記事では私はAddStudentAction.javaHIbernate saveorUpdate（）更新中に新しいレコードを挿入
...質問と回答を掲載、重複としてそれをマークする前に、私の質問を読むためにを要求していてください。
public class AddStudentAction extends ActionSupport implements ModelDriven<Student> { public AddStudentAction() { // TODO Auto-generated constructor stub } Student student = new Student(); private String firstName; private int id; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstNameSearch(String firstName) { this.firstName = firstName; } List<Student> students = new ArrayList<Student>(); List<Student> studentFirstNames = new ArrayList<Student>(); public List<Student> getStudentFirstNames() { return studentFirstNames; } public void setStudentFirstNames(List<Student> studentFirstNames) { this.studentFirstNames = studentFirstNames; } StudentDAO dao = new StudentDAO(); public Student getStudent() { return student; } public void setStudent(Student student) { this.student = student; } public List<Student> getStudents() { return students; } public void setStudents(List<Student> students) { this.students = students; } public StudentDAO getDao() { return dao; } public void setDao(StudentDAO dao) { this.dao = dao; } @Override public Student getModel() { // TODO Auto-generated method stub return student; } @Override public String execute() { // TODO Auto-generated method stub dao.addStudent(student); String f = student.getFirstName(); String l = student.getLastName(); int m = student.getMarks(); System.out.println(f + l + m + "Inside execute method"); return "success"; } public String updateStudent() { dao.addStudent(student); return "success"; } public String listStudents() { students = dao.getStudents(); return "success"; } public String editStudent() { HttpServletRequest request = (HttpServletRequest) ActionContext .getContext().get(ServletActionContext.HTTP_REQUEST); student = dao.listStudentById(Integer.parseInt((request .getParameter("id")))); student.setId(Integer.parseInt((request.getParameter("id")))); System.out.println(request.getParameter("id") + "id in editStudent"); dao.updateStudent(student); return SUCCESS; } StudentDAO.java
public class StudentDAO {
@SessionTarget
Session session;
@TransactionTarget
Transaction transaction;
public void addStudent(Student student) {
try {
session.saveOrUpdate(student);
} catch (Exception e) {
e.printStackTrace();
}
}
public void updateStudent(Student student) {
try {
session.saveOrUpdate(student);
session.flush();
} catch (Exception e) {
e.printStackTrace();
}
}
public Student listStudentById(int Id) {
Student student = null;
try {
student = (Student) session.get(Student.class, Id);
} catch (Exception e) {
}
return student;
}
}
Student.java
package com.struts2hibernatepagination.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "student")
public class Student {
@Id
@GeneratedValue
@Column(name = "id")
private int id;
@Column(name = "last_name")
private String lastName;
@Column(name = "first_name")
private String firstName;
private int marks;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public int getMarks() {
return marks;
}
public void setMarks(int marks) {
this.marks = marks;
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<package name="default" extends="hibernate-default">
<action name="addStudent" method="execute"
class="com.struts2hibernatepagination.action.AddStudentAction">
<interceptor-ref name="defaultStackHibernateStrutsValidation">
<param name="validation.excludeMethods">listStudents</param>
<param name="validation.excludeMethods">fetchStudentList</param>
</interceptor-ref>
<result name="success" type="redirect">
listStudents
</result>
<result name="input">/student.jsp</result>
</action>
<action name="editStudent"
class="com.struts2hibernatepagination.action.AddStudentAction"
method="editStudent">
<interceptor-ref name="basicStackHibernate" />
<result name="success">/student.jsp</result>
</action>
</package>
hibernate.cfg.xmlの
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">admin12345</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.1.3:3306/nupur</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping class="com.struts2hibernatepagination.hibernate.Student" />
</session-factory>
</hibernate-configuration>
student.jsp
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
<s:head />
</head>
<body>
<a href="searchStudent.jsp">Search</a>
<s:form action="addStudent">
<s:actionerror />
<s:textfield name="firstName" label="First Name" />
<s:textfield name="lastName" label="Last Name" />
<s:textfield name="marks" label="Marks" />
<s:submit value="Save" />
<hr />
<table border="2">
<tr bgcolor="cyan">
<th><u>First Name</u></th>
<th><u>Last Name</u></th>
<th><u>Marks</u></th>
<th><u>Edit</u></th>
<th><u>Delete</u></th>
</tr>
<s:iterator value="students">
<tr>
<td><s:property value="firstName" /></td>
<td><s:property value="lastName" /></td>
<td><s:property value="marks" /></td>
<td><s:url id="editURL" action="editStudent">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{editURL}">Edit</s:a></td>
<td><s:url id="deleteURL" action="deleteStudent">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{deleteURL}">Delete</s:a></td>
</tr>
</s:iterator>
</table>
</s:form>
<s:form action="fetchStudentList">
<s:submit value="Show"></s:submit>
</s:form>
</body>
</html>
は...私を助けてください
IdがaddStudent（）
public String editStudent() {
HttpServletRequest request = (HttpServletRequest) ActionContext
.getContext().get(ServletActionContext.HTTP_REQUEST);
dao.listStudentById(Integer.parseInt((request.getParameter("id")))); return SUCCESS;
} //AddStudetnAction class method
public void addStudent(Student student) {
try {
System.out.println(student.getId() + "In DAO addStudent");// returning null
session.saveOrUpdate(student);
} catch (Exception e) {
e.printStackTrace();
}
//StudentDAO class method
ザ・に来ていませんStudentDAOのaddStudent()は、あなたがアップしたい場合は、それは
ありがとうございました。私は同じ変更を行い、以前の回答として投稿しました。 – Nupur