在f：param

编程问答 2022-06-06

问题描述

有没有办法将整个List 作为f：param传递？

我有两个通过双向OneToMany / ManyToOne关系连接的数据库。首先，我具有元素及其属性（名称除外），它通过id与第二个数据库连接，第二个数据库使用不同的语言命名（每种语言都有其自己的id。

我还有两页。首先，我在第一个数据库中搜索符合条件的元素。结果显示在数据表中，最后一列带有“编辑”按钮。

当您单击该行中的“编辑”按钮时，它将在第二页上将您发送给您，该页面上应显示两个数据库中该元素的属性。

使用f：param可以将id发送到其他页面，但是在页面上尚未设置id的加载值，因此无法从第二个数据库加载值（我得到nullpointerexception）。如果我将ID设置为静态。它会加载，但始终相同。

我使用postgresql，primefaces和Wildfly17。如果我忘了提些什么，请告诉我。

我的代码：

SmPestEditable.xhtml：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui">
<f:metadata>
    <f:viewParam name="id" value="#{smPestsEditable.id}" />
    <f:viewParam name="code" value="#{smPestsEditable.code}" />
    <f:viewParam name="lname" value="#{smPestsEditable.latinName}" />
    <f:viewParam name="irecog" value="#{smPestsEditable.imgRecognition}" />
    <f:viewAction action="#{smPestsEditable.onload}" />
</f:metadata>

<h:messages />
<h:head></h:head>
<h:body>
<style type="text/css">
    .ui-row-editor .ui-row-editor-pencil {
        margin-left:8px;
    }
</style>
    <h:form id="pestsListEdit">
        <p:growl id="msgs" showDetail="true" />

        <p:panel id="SearchPest" header="EDIT PEST" toggleable="true"
            closable="true" toggleSpeed="500" closeSpeed="500" widgetVar="panel"
            style="margin-bottom:20px">

            <p:panelGrid columns="2">

                <h:outputLabel for="Id" value="Id" />
                <h:outputText  value="#{request.getParameter('id')}"/>
                <h:outputLabel for="slo" value="lo" />
                <h:outputText  value="#{request.getParameter('id')}"/>
                <h:outputLabel for="Code" value="Code" />
                <p:inputText id="Code" value="#{smPestsEditable.code}" label="Code" />                          
                <h:outputLabel for="lnme" value="Latin Name" />
                <p:inputText id="LatinName" value="#{smPestsEditable.latinName}" label="latin" />                           

                    
                <f:facet name="footer">
                    <p:commandButton value="CHECK"
                        actionListener = "#{smPestsEditable.saveButton}"            
                        action = "SmPestsList?faces-redirect-true" />
                    <p:linkButton outcome="SmPestsList" value="CLOSE"
                        style="margin-right:20px;">
                    </p:linkButton>
                </f:facet>
            </p:panelGrid>

        </p:panel>
        <p:dataTable var="ime" value="#{smPestsEditable.imena}">
            <p:column headerText="ID PEST NAME">
                <h:outputText value="#{ime.idPestName}" />
            </p:column>
            <p:column headerText="LANGUAGE">
                <h:outputText value="Srpski"
                    rendered="#{ime.idLanguage eq 12}" />
                <h:outputText value="Français"
                    rendered="#{ime.idLanguage eq 13}" />
                <h:outputText value="Italiano"
                    rendered="#{ime.idLanguage eq 8}" />
                <h:outputText value="English"
                    rendered="#{ime.idLanguage eq 4}" />
                <h:outputText value="Português"
                    rendered="#{ime.idLanguage eq 9}" />
                <h:outputText value="Deutsch"
                    rendered="#{ime.idLanguage eq 11}" />
                <h:outputText value="Magyar"
                    rendered="#{ime.idLanguage eq 10}" />
                <h:outputText value="Português"
                    rendered="#{ime.idLanguage eq 14}" />
                <h:outputText value="Yкраїнський"
                    rendered="#{ime.idLanguage eq 15}" />
            </p:column>
            <p:column headerText="DISPLAY NAME">
                <p:inplace id="name">
                    <p:inputText value="#{ime.name}" label="Name" />
                </p:inplace>
            </p:column>
        </p:dataTable>



    </h:form>
</h:body>
</html>

SmPestEditable.java：

package si.david;
import java.sql.SQLException;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.enterprise.context.RequestScoped;
import javax.faces.annotation.ManagedProperty;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityResult;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.FieldResult;
import javax.persistence.Query;
import javax.persistence.SqlResultSetMapping;
import javax.persistence.TypedQuery;

import si.david.SmPests;
import si.david.SmPestsNames;

import org.hibernate.annotations.CreationTimestamp;
import org.junit.Before;
import org.primefaces.event.RowEditEvent;

    @Named(value="smPestsEditable")
    @RequestScoped
    public class SmPestsEditable {
        
        
    private List<SmPestsNames> pests = new ArrayList<SmPestsNames>();
    private EntityManager em =null;
    private EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
    private int stevilka;
    private int id;
    private int idPest=55;
    private String sloName;
    
    SmPests zuzek1=loadPestById(idPest);
    private String code = zuzek1.getCode();
    private String oldCode = code;

    private String latinName = zuzek1.getLatinName();
    private String oldLatinName = latinName;
    private String refLink = zuzek1.getRefLink();
    private String oldRefLink = refLink;
    private Integer imgRecognition = zuzek1.getImgRecognition();
    private Integer oldImgRecognition = imgRecognition;
    private Integer hideScore = zuzek1.getHideScore();
    private Integer oldHideScore = hideScore;
    private Integer recognitionModel = zuzek1.getRecognitionModel();
    private Integer oldRecognitionModel = recognitionModel;
    private Double alarmThresholdUp = zuzek1.getAlarmThresholdUp();
    private Double oldAlarmThresholdUp = alarmThresholdUp;
    private Double alarmThresholdLow = zuzek1.getAlarmThresholdLow();
    private Double oldAlarmThresholdLow = alarmThresholdLow;
    List<SmPestsNames> imena = zuzek1.getSmPestsNames();    
    private Long idPestName;
    private int idLanguage;
    private String name;
    private LocalDateTime dInsert;
    private Long idInserter;
    private LocalDateTime dUpdate;
    private Long idUpdater;
    SmPests zuzek;
    
    
    public void onload() {
        try  {
            System.out.println(" ONLOAD: id "+id);
            System.out.println(" idpest "+idPest);
            }  catch (Exception e)   {
                System.out.println(" Can’t find  id!");
            }           
    }
    public void saveButton() {
        System.out.println("SAVE button");  
        try  {
            pestsNames(id);
            System.out.println("Sprintano pestnames(id)");
            
        }  catch (Exception e)   {
            System.out.println("Ujej!");
        }
    }

    public void pestsNames(int id) {
        EntityManager em =null;
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        em = emf.createEntityManager();
        SmPests zuzek = em.find(SmPests.class,id);
        try  {
            List<SmPestsNames> imena = zuzek.getSmPestsNames(); 
            for(SmPestsNames s : imena) {
                System.out.print(s.getIdPestName());
                System.out.print(" | "+s.getIdLanguage());
                System.out.println(" | "+s.getName());}
        }  catch (Exception e)   {
            System.out.println("Ujej!");
        }
    }
    
    private SmPests loadPestById(int id) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        EntityManager em = emf.createEntityManager();
        SmPests zuzek = em.find(SmPests.class,id);
        return zuzek;
    }
}

SmPestList.xhtml：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui">
<h:head></h:head>
<h:body>
<style type="text/css">
    .ui-row-editor .ui-row-editor-pencil {
        margin-left:8px;
    }
</style>
    <h:form id="pestsList">
        <p:growl id="msgs" showDetail="true" />

        <p:panel id="SearchPest" header="Search for pests" toggleable="true"
            closable="true" toggleSpeed="500" closeSpeed="500" widgetVar="panel"
            style="margin-bottom:20px">

            <p:panelGrid columns="2">

                <h:outputLabel for="Code" value="Code" />
                <p:inputText id="Code" value="#{smPestsList.code}" label="Code" />
                <h:outputLabel for="Latin" value="Latin Name" />
                <p:inputText id="Latin" value="#{smPestsList.latinName}"
                    label="Latin name" />
                <h:outputLabel for="Recog" value="Image Recognition" />
                <p:selectOneMenu id="selectOne">
                    <f:selectItem itemLabel="" itemValue="" />
                    <f:selectItem itemLabel="SEGMENTATION" itemValue="1899" />
                    <f:selectItem itemLabel="R-CNN" itemValue="1900" />
                    <f:selectItem itemLabel="NONE - COPY MARKINGS" itemValue="1951" />
                </p:selectOneMenu>


                <f:facet name="footer">
                    <p:commandButton value="Search"
                        action="#{smPestsList.searchButton}" icon="ui-icon-check"
                        update=":pestsList:pestsTbl" />
                    <p:commandButton value="Search and Izpis"
                        action="#{smPestsList.pestsNames}" icon="ui-icon-check"
                        update=":pestsList:pestsTbl" />
                    <p:commandButton value="Search and Izpis arg"
                        action="#{smPestsList.pestsName(74)}" icon="ui-icon-check"
                        update=":pestsList:pestsTbl" />
                    <p:linkButton outcome="SmPestsEdit" value="Add"
                        style="margin-right:20px;">
                    </p:linkButton>
                    
                </f:facet>
            </p:panelGrid>

        </p:panel>

        <p:dataTable id="pestsTbl" var="zuzek" value="#{smPestsList.pests}" editable="true"
            style="margin-bottom:40px">
            <f:facet name="header">
           PESTS
       </f:facet>
            <p:column headerText="Id">
                <h:outputText value="#{zuzek.idPest}" />
            </p:column>
            <p:column headerText="Code">
                <h:outputText value="#{zuzek.code}" />
            </p:column>
            <p:column headerText="Latin Name">
                <h:outputText value="#{zuzek.latinName}" />
            </p:column>
            <p:column>
            <p:linkButton outcome="SmPestsEditable" update="pestsListEdit" value="Edit" style="font-size:3em" title="edit">
                <f:param name="id" value="#{zuzek.idPest}" />
                <f:param name="code" value="#{zuzek.code}" />
                <f:param name="lname" value="#{zuzek.latinName}" />
            </p:linkButton>
            <p:button outcome="SmPestsEditable" icon="pi pi-trash" style="margin-right:5px;" title="delete">
                <f:param name="id" value="30" />
            </p:button>
            </p:column>
        </p:dataTable>


    </h:form>
</h:body>
</html>

SmPestList.java：

package si.david;
import java.sql.SQLException;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.enterprise.context.RequestScoped;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.inject.Named;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityResult;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.FieldResult;
import javax.persistence.Query;
import javax.persistence.SqlResultSetMapping;
import javax.persistence.TypedQuery;

import si.david.SmPests;
import si.david.SmPestsNames;

import org.hibernate.annotations.CreationTimestamp;
import org.junit.Before;
import org.primefaces.event.RowEditEvent;
import org.primefaces.event.SelectEvent;

    @Named(value="smPestsList")
    @RequestScoped
    public class SmPestsList {
    private List<SmPests> pests = new ArrayList<SmPests>();
    
    private EntityManager em =null;
    private EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
    private int idPest;
    private String latinName;
    private String code;
    private String srpName;
    private Long srpId;
    private String fraName;
    private Long fraId;
    private String itaName;
    private Long itaId;
    private String engName;
    private Long engId;
    private String espName;
    private Long espId;
    private String deuName;
    private Long deuId;
    private String magName;
    private Long magId;
    private String porName;
    private Long porId;
    private String ukrName;
    private Long ukrId;
    private List<SmPestsNames> smPestsNames = new ArrayList<SmPestsNames>();
    
    public void searchButton() {
        EntityManager em =null;
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        em = emf.createEntityManager();
        String query;
        SmPests zuzek1 = new SmPests();
        int parametri = 0;
        if(!code.isEmpty())  {
            parametri++;
        }
        if(!latinName.isEmpty())  {
            parametri++;
        }
System.out.println("parametri:" + parametri);           
        query ="SELECT DISTINCT s FROM SmPests s";
        if( getCode() != null && !"".equals(getCode()) ) {
            parametri ++;
        }
        if( getLatinName() != null && !"".equals(getLatinName()) ) {
            parametri ++;
        }               

        if(parametri >0) {
            query = query + " WHERE ";
            if( getCode() != null && !"".equals(getCode()) ) {
                parametri --;
                query = query +"(code LIKE UPPER('%" + getCode() + "%') OR code LIKE UPPER('" + getCode() + "%'))";
            }
            if( getCode() != null && !"".equals(getCode()) && getLatinName() != null && !"".equals(getLatinName()) ) 
                query = query + " AND ";
            if( getLatinName() != null && !"".equals(getLatinName()) ) {
                parametri --;
                query = query + "UPPER(latinName) LIKE '" + getLatinName() + "'";
            }
        }
        System.out.println("query: " + query);
        try {
            List<SmPests> results = em.createQuery(query,SmPests.class).getResultList();    
            for(SmPests s : results) {
                SmPests zuzek = new SmPests();
                zuzek.setIdPest(s.getIdPest());
                zuzek.setCode(s.getCode());
                zuzek.setLatinName(s.getLatinName());
                try  {
                    List<SmPestsNames> imena = zuzek.getSmPestsNames(); 
                    for(SmPestsNames t : imena) {
                        System.out.print(t.getIdPestName());
                        System.out.print(" | "+t.getIdLanguage());
                        System.out.println(" | "+t.getName());
                        }
                }  catch (Exception e)   {
                    System.out.println("Oops");
                }

                pests.add(zuzek);
        }} catch (Exception e) {
            System.out.println("doesn’t work”);
        }   
        
}
    public void izpisime() {
        System.out.println("pest data: ");
    }
    public void pestsName(int id) {
        EntityManager em =null;
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        em = emf.createEntityManager();
        String query;
        SmPests zuzek = em.find(SmPests.class,id);
        query ="SELECT DISTINCT s FROM SmPestNames s";
        try  {
            List<SmPestsNames> imena = zuzek.getSmPestsNames(); 
            for(SmPestsNames s : imena) {
                if(s.getIdLanguage()==1) {
                    sloId=s.getIdPestName();
                    sloName=s.getName();
                }
                System.out.print(s.getIdPestName());
                System.out.print(" | "+s.getIdLanguage());
                System.out.println(" | "+s.getName());}
        }  catch (Exception e)   {
            System.out.println("pesetsName(int id) doesn’t work");
        }
    }
    private SmPests loadPestById(int id) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        EntityManager em = emf.createEntityManager();
        SmPests zuzek = em.find(SmPests.class,id);
        System.out.println("naslooo");
        try  {
            System.out.print(zuzek.getIdPest());
            System.out.print(" | "+zuzek.getCode());
            System.out.print(" | "+zuzek.getLatinName());
            System.out.print(" | "+zuzek.getImgRecognition());
        }  catch (Exception e)   {
            System.out.println("Can’t fin pest id: " + id);
        }
        return zuzek;
    }
    private SmPestsNames loadNamesById(int id) {
        System.out.println("loading pest");
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("tvTutorialPU");
        EntityManager em = emf.createEntityManager();
        
SmPestsNames imena = em.find(SmPestsNames.class,id);
        System.out.println("naslooo");
        try  {
            System.out.print(imena.getIdPestName());
        }  catch (Exception e)   {
            System.out.println("Ni bla- ja!");
        }
        return imena;
    }
    
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

hibernate-onetomanyjavajavajpaprimefaces

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