显示2个不同实体表的数据表需要从数据库表中获取另一列值

Question

我需要从 UI jsf 的单个数据表中的 LangDef 实体类中获取语言名称的列值。请让我尽快

<p:dataTable id="dataTable" emptyMessage="#{res.NO_RECORDS_FOUND}" var="lab" value="#{labelsMB.listData}" editable="true" editMode="cell" paginator="true" rows="10" paginatorTemplate="  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"   rowsPerPageTemplate="5,10,15"> 
<p:column headerText="#{res.CAPTION_DET}" sortBy="#{lab.captionDet}" filterBy="#{lab.captionDet}" filterMatchMode="contains" filterStyle="width: 360px;">
                                        <p:cellEditor>
                                            <f:facet name="output">
                                                <h:outputText value="#{lab.captionDet}" />
                                            </f:facet>
                                            <f:facet name="input">
                                                <h:inputText value="#{lab.captionDet}" style="width:96%"/>
                                            </f:facet>
                                        </p:cellEditor>
                                    </p:column>
                                    <p:column headerText="#{res.LABEL_NO}" sortBy="#{lab.iasLabelsPK.labelNo}" filterBy="#{lab.iasLabelsPK.labelNo}">
                                        <p:outputLabel value="#{lab.iasLabelsPK.labelNo}" />
                                    </p:column>
                                    <p:column headerText="#{res.LANGUAGE_NO}" sortBy="#{lab.iasLabelsPK.langNo}" filterBy="#{lab.iasLabelsPK.langNo}" width="100">
                                        <p:outputLabel value="#{lab.iasLabelsPK.langNo}" />
                                    </p:column>
                                    <p:column headerText="#{res.LANGUAGE_NAME}" sortBy="#{lab.???????}" filterBy="#{lab.?????}" width="130">
                                        <p:outputLabel value="#{lab...?????}" />
                                    </p:column>
 </p:dataTable>

IAS_LABELS DAO 实体：

public interface ILabelsDAO extends CrudRepository<IasLabels, IasLabelsPK>{        
    @Query List<IasLabels> findAll(); 
}

LabelService 服务类

@Service
@Transactional
public class LabelService {

    static Logger logger = Logger.getLogger(LabelService.class);

    @Autowired
    private ILabelsDAO labelRepo;

    public ILabelsDAO getLabelRepo() {
        return labelRepo;
    }

    public void setLabelRepo(ILabelsDAO labelRepo) {
        this.labelRepo = labelRepo;
    }

    public List<IasLabels> getAllLabels() {
        if (this.getLabelRepo() != null) 
            return this.getLabelRepo().findAll();
        return null;
    }

    public Iterable<IasLabels> saveData(List<IasLabels> originalValue) {
        return labelRepo.save(originalValue);
    }

}

LabelsMB ManagedBean 实施

@ManagedBean
@SessionScoped
public class LabelsMB {

    static Logger logger = Logger.getLogger(LabelsMB.class);

    List<IasLabels> labelsList = null;

    @ManagedProperty(value = "#{labelService}")
    private LabelService labelService;

    public LabelService getLabelService() {
         return labelService;
    }

    public void setLabelService(LabelService labelService) {
        this.labelService = labelService;
    }


    public List<IasLabels> getListData() {
        if (labelsList == null || labelsList.isEmpty()) {
            if (this.getLabelService() != null) {
                labelsList = this.getLabelService().getAllLabels();
            }
        }
        return labelsList;
}

LangDef 实体类

@Entity
@Table(name = "LANG_DEF")
@XmlRootElement
@NamedQueries({
        @NamedQuery(name = "LangDef.findAll", query = "SELECT l FROM LangDef l"),
        @NamedQuery(name = "LangDef.findByLangNo", query = "SELECT l FROM LangDef l WHERE l.langNo = :langNo"),
        @NamedQuery(name = "LangDef.findByLangName", query = "SELECT l FROM LangDef l WHERE l.langName = :langName"),
        @NamedQuery(name = "LangDef.findByRepExt", query = "SELECT l FROM LangDef l WHERE l.repExt = :repExt"),
        @NamedQuery(name = "LangDef.findByLangDflt", query = "SELECT l FROM LangDef l WHERE l.langDflt = :langDflt"),
        @NamedQuery(name = "LangDef.findByLangDir", query = "SELECT l FROM LangDef l WHERE l.langDir = :langDir"),
        @NamedQuery(name = "LangDef.findByFlgSt", query = "SELECT l FROM LangDef l WHERE l.flgSt = :flgSt"),
        @NamedQuery(name = "LangDef.findByLangExt", query = "SELECT l FROM LangDef l WHERE l.langExt = :langExt")})
public class LangDef implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @NotNull
    @Column(name = "LANG_NO")
    private Short langNo;
    @Size(max = 60)
    @Column(name = "LANG_NAME")
    private String langName;
    @Size(max = 10)
    @Column(name = "REP_EXT")
    private String repExt;
    @Column(name = "LANG_DFLT")
    private Short langDflt;
    @Column(name = "LANG_DIR")
    private Short langDir;
    @Column(name = "FLG_ST")
    private Short flgSt;
    @Size(max = 10)
    @Column(name = "LANG_EXT")
    private String langExt;

    public LangDef() {
    }

    public LangDef(Short langNo) {
     this.langNo = langNo;
    }

    public Short getLangNo() {
        return langNo;
    }

    public void setLangNo(Short langNo) {
       this.langNo = langNo;
    }

    public String getLangName() {
        return langName;
    }

    public void setLangName(String langName) {
        this.langName = langName;
    }
}

我需要从 UI jsf 的单个数据表中的 LangDef 实体类中获取语言名称的列值。请让我尽快

Answer 1

你只需要像下面这样改变你的代码

在 xhtml 中：

<p:column headerText="#{res.LANGUAGE_NAME}" sortBy="#{lab.langDef.langName}"    filterBy="#{lab.langDef.langName}" width="130">
              <p:outputLabel value="#{lab.langDef.langName}" />
</p:column>

实体IasLabels：

@Entity
@Table(name = "LAS_LABELS")
public class IasLabels implements Serializable {

    private LangDef langDef;


    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "LANG_NO", nullable = false)
    public LangDef getLangDef() {
        return this.langDef;
    }

    public void setLangDef(LangDef langDef) {
        this.langDef = langDef;
    }
}

希望对你有所帮助..

已编辑：

你需要在你的spring配置文件中添加以下内容

@Autowired
SessionFactory sessionFactory;

@Override
public void addInterceptors(InterceptorRegistry registry) {
            registry.addWebRequestInterceptor(openSessionInViewInterceptor());
}

@Bean
public OpenSessionInViewInterceptor openSessionInViewInterceptor(){
        OpenSessionInViewInterceptor openSessionInterceptor = new OpenSessionInViewInterceptor();
        openSessionInterceptor.setSessionFactory(sessionFactory);
        return openSessionInterceptor;
}