我想知道你是否可以帮助我
基本上我已经创建了一个数据库,它将数据添加到表中的两条数据中,将其余列留空,我想要做的是能够使用更多数据来更新这些记录空白列,我怎样才能实现这一点?
这是我的代码 atm,但我只是收到一个空点错误,并且不知道我做得是否正确
这是用户界面
<p>
Student Number : <!--More for me than anything -->
<h:inputText value="#{editMarkingBean.markSectionTwo.studentNumber}" />
</p>
这是输入学号的地方,这就是我要更新的内容,包含该学号的记录(不可能有多个相同的用户名)
<p:spinner id="ajaxspinner80-100" value="#{editMarkingBean.markSectionTwo.markSectionTwo}"
stepFactor="1" min="80" max="100" disabled="#{formBean.number != 8}">
<p:ajax update="ajaxspinnervalue" process="@this" />
</p:spinner>
这是我要添加到列 markSectionTwo
保存按钮
<p:commandButton action="#{editMarkingBean.markSectionTwo}" value="#{bundle.buttonSave}" update=":growl" icon="ui-icon-disk"/>
支持 bean:
private MarkingService markingService;
@Inject
private MarkingFacade markingFacade;
public void markSectionTwo() {
this.markingFacade.edit(this.markSectionTwo);
this.setMessage("Mark Saved");
}
这是创建表的实体
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String studentNumber,markingStage, markingCompleted, markSectionOne, markSectionTwo, markSectionThree, markSectionFour, markSectionFive, overalMark, plagorism, feedback, comments;
我收到错误
WARNING: javax.el.PropertyNotFoundException: /lecturer/marking/marking-section-two.xhtml @109,82 value="#{editMarkingBean.markSectionTwo.markSectionTwo}": Target Unreachable, 'null' returned null
如何根据学号更新记录?
谢谢大家
编辑
这是完整的 editMarkingController 类
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package sws.control;
import java.util.Date;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Inject;
import javax.inject.Named;
import sws.business.MarkingService;
import sws.entities.Marking;
import sws.persistance.MarkingFacade;
/**
*
* @author Richard
*/
@Named(value = "editMarkingBean")
@ViewScoped
public class EditMarkingController {
private String searchString;
private String ordering;
private String criteria;
private String match;
private Date today;
private String caseMatch;
private int spinnerField;
private Marking markSectionOne;
private Marking studentNumber;
private Marking markSectionTwo;
private MarkingService markingService;
@Inject
private MarkingFacade markingFacade;
/*
public String markSectionOne() {
//supposing the data in markSectionOne is filled...
this.markingFacade.create(markSectionOne);
this.setMessage("Mark Saved");
//after saving...
markSectionOne = new Marking();
// now navigating to the next page
return "/lecturer/marking/marking-section-two";
}
*/
public void editMark() {
this.markingFacade.edit(this.markSectionTwo);
this.setMessage("Mark Saved");
}
public void markSectionTwo() {
this.markingFacade.edit(this.markSectionTwo);
this.setMessage("Mark Saved");
}
private void setMessage(String message) {
FacesContext fc = FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(message, ""));
}
public Marking getMarkSectionTwo() {
return markSectionTwo;
}
public void setMarkSectionTwo(Marking markSectionTwo) {
this.markSectionTwo = markSectionTwo;
}
public String getSearchString() {
return searchString;
}
public void setSearchString(String searchString) {
this.searchString = searchString;
}
public String getOrdering() {
return ordering;
}
public void setOrdering(String ordering) {
this.ordering = ordering;
}
public String getCriteria() {
return criteria;
}
public void setCriteria(String criteria) {
this.criteria = criteria;
}
public String getMatch() {
return match;
}
public void setMatch(String match) {
this.match = match;
}
public Date getToday() {
return today;
}
public void setToday(Date today) {
this.today = today;
}
public String getCaseMatch() {
return caseMatch;
}
public void setCaseMatch(String caseMatch) {
this.caseMatch = caseMatch;
}
public int getSpinnerField() {
return spinnerField;
}
public void setSpinnerField(int spinnerField) {
this.spinnerField = spinnerField;
}
public Marking getMarkSectionOne() {
return markSectionOne;
}
public void setMarkSectionOne(Marking markSectionOne) {
this.markSectionOne = markSectionOne;
}
public Marking getStudentNumber() {
return studentNumber;
}
public void setStudentNumber(Marking studentNumber) {
this.studentNumber = studentNumber;
}
public MarkingService getMarkingService() {
return markingService;
}
public void setMarkingService(MarkingService markingService) {
this.markingService = markingService;
}
public MarkingFacade getMarkingFacade() {
return markingFacade;
}
public void setMarkingFacade(MarkingFacade markingFacade) {
this.markingFacade = markingFacade;
}
}
完整的标记服务
import java.util.List;
import javax.ejb.EJB;
import javax.inject.Inject;
import sws.entities.Marking;
import sws.entities.ProjectIdea;
import sws.persistance.MarkingFacade;
import sws.persistance.PersonFacade;
/**
*
* @author Richard
*/
public class MarkingService {
@EJB
private MarkingFacade markingFacade;
public List<Marking> getAllMarks() {
return markingFacade.findAll();
}
}
和complte标记实体
/* * 要更改此许可证 header ,请在项目属性中选择许可证 header 。 * 要更改此模板文件,请选择“工具”|“模板 * 并在编辑器中打开模板。 */
package sws.entities;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
/**
*
* @author Richard
*/
@Entity(name = "MARKING")
public class Marking implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String studentNumber,markingStage, markingCompleted, markSectionOne, markSectionTwo, markSectionThree, markSectionFour, markSectionFive, overalMark, plagorism, feedback, comments;
public String getStudentNumber() {
return studentNumber;
}
public void setStudentNumber(String studentNumber) {
this.studentNumber = studentNumber;
}
public String getMarkingStage() {
return markingStage;
}
public void setMarkingStage(String markingStage) {
this.markingStage = markingStage;
}
public String getMarkingCompleted() {
return markingCompleted;
}
public void setMarkingCompleted(String markingCompleted) {
this.markingCompleted = markingCompleted;
}
public String getMarkSectionOne() {
return markSectionOne;
}
public void setMarkSectionOne(String markSectionOne) {
this.markSectionOne = markSectionOne;
}
public String getMarkSectionTwo() {
return markSectionTwo;
}
public void setMarkSectionTwo(String markSectionTwo) {
this.markSectionTwo = markSectionTwo;
}
public String getMarkSectionThree() {
return markSectionThree;
}
public void setMarkSectionThree(String markSectionThree) {
this.markSectionThree = markSectionThree;
}
public String getMarkSectionFour() {
return markSectionFour;
}
public void setMarkSectionFour(String markSectionFour) {
this.markSectionFour = markSectionFour;
}
public String getMarkSectionFive() {
return markSectionFive;
}
public void setMarkSectionFive(String markSectionFive) {
this.markSectionFive = markSectionFive;
}
public String getOveralMark() {
return overalMark;
}
public void setOveralMark(String overalMark) {
this.overalMark = overalMark;
}
public String getPlagorism() {
return plagorism;
}
public void setPlagorism(String plagorism) {
this.plagorism = plagorism;
}
public String getFeedback() {
return feedback;
}
public void setFeedback(String feedback) {
this.feedback = feedback;
}
public String getComments() {
return comments;
}
public void setComments(String comments) {
this.comments = comments;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Marking)) {
return false;
}
Marking other = (Marking) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "sws.entities.Marking[ id=" + id + " ]";
}
public void setmarkSectionOne(String markSectionOne) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
编辑2:
我添加了一个后构造
@PostConstruct
public void markSectionTwo() {
this.markingFacade.edit(this.markSectionTwo);
markSectionTwo = new Marking();
this.setMessage("Mark Saved");
}
但现在我收到错误消息 http 500 error
javax.servlet.ServletException: WELD-000049 Unable to invoke public void sws.control.EditMarkingController.markSectionTwo() on sws.control.EditMarkingController@44de1491
root cause
org.jboss.weld.exceptions.WeldException: WELD-000049 Unable to invoke public void sws.control.EditMarkingController.markSectionTwo() on sws.control.EditMarkingController@44de1491
root cause
java.lang.reflect.InvocationTargetException
root cause
javax.ejb.EJBException
root cause
java.lang.IllegalArgumentException: Object: null is not a known entity type.
当我尝试加载页面时
编辑3
我已经解决了这个问题,但现在我只能添加记录,我想做的是合并记录,所以如果studentNumber与表中已有的相同,则将markSectionTwo更新为这个值而不是在数据库中为其创建新行
private Marking markSectionTwo;
private MarkingService markingService;
@Inject
private MarkingFacade markingFacade;
@PostConstruct
public void init() {
this.markSectionTwo = new Marking();
}
public String markSectionTwo() {
//supposing the data in markSectionOne is filled...
//markSectionOne.setMarkSectionOne("markSectionOne");
//markSectionTwo.setMarkSectionTwo("markSectionTwo");
this.markingFacade.edit(markSectionTwo);
this.setMessage("Mark Saved");
//after saving...
markSectionTwo = new Marking();
this.setMessage("Mark Saved");
// now navigating to the next page
return "/lecturer/marking/marking-section-two";
}
private void setMessage(String message) {
FacesContext fc = FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(message, ""));
}
最佳答案
您的错误消息
javax.el.PropertyNotFoundException (...) #{editMarkingBean.markSectionTwo.markSectionTwo}"
基本上说你必须有
- 一个名为 editMarkingBean 的托管 Bean
- 托管 Bean 中名为 markSectionTwo 的对象,具有适当的 getter 和 setter
- 对象 markSectionTwo 中名为 markSectionTwo 的属性,具有适当的 getter 和 setter
所以 EL 试图调用的是
editMarkingBean.getMarkSectionTwo().getMarkSectionTwo()
请检查您的所有类,如果可能,请发布问题中的所有相关部分,例如类名称(所有)、托管 bean 范围注释、getter 和 setter 以及属性。
关于java - 更新数据库中的记录 - JSF JPA 等,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21920337/