為什么此Hibernate JPQL查詢無法工作？

Question

我在Hibernate和JPQL查詢中絕對是新手，嘗試啟動以下查詢時遇到一些問題。 情況如下，我有：

1）名為KMCountryArea的實體類，該實體類將KM_COUNTRY_AREA表映射到我的數據庫中：

@NamedQueries({
        //@NamedQuery(name = "kmCountryListByName", query = "SELECT c FROM KMCountryArea c WHERE c.nomeFolder  = :nomeFolder order by c.idCountryArea")
        @NamedQuery(name = "kmCountryListByName", query = "SELECT c FROM KMCountryArea c WHERE c.nomeFolder  = :nomeFolder order by c.idCountryArea")
})

/*@NamedQuery(name = "kmCountryListByName", query = "SELECT country FROM KMCountryArea country WHERE country.nomeFolder  = :nomeFolder order by country.idCountry")*/

@Entity
@Table(name = "KM_COUNTRY_AREA")
public class KMCountryArea implements Serializable {

    @Id
    @GeneratedValue
    private Long idCountryArea;

    @Column(name = "nomeFolder")
    private String nomeFolder;

    //@Column(name = "country")
    //@OneToOne(mappedBy = "country", cascade = CascadeType.ALL)
    @OneToOne
    private KMCountry country;

    public Long getIdCountryArea() {
        return idCountryArea;
    }

    public void setIdCountryArea(Long idCountryArea) {
        this.idCountryArea = idCountryArea;
    }

    public String getNomeFolder() {
        return nomeFolder;
    }

    public void setNomeFolder(String nomeFolder) {
        this.nomeFolder = nomeFolder;
    }

    public KMCountry getCountry() {
        return country;
    }

    public void setCountry(KMCountry country) {
        this.country = country;
    }
}

如您所見，此類和相關表只有3個字段：

• 行編號 ：

   @Id @GeneratedValue private Long idCountryArea; 

• 與表上的nomeFolder列匹配的nomeFolder字符串：

   @Column(name = "nomeFolder") private String nomeFolder; 

• 代表與我的項目中定義的另一個KMCountry實體類一對一關系的KMCountry國家 ，該實體類本身已將該字段定義為id private Long idCountry；

   @OneToOne private KMCountry country; 

實際上，此Hibernate實體類可在數據庫內部正確生成KM_COUNTRY表，這是我在數據庫內部看到的KM_COUNTRY表字段：

COLUMN NAME          DATA_TYPE           NULLABLE    DATA_DEFAULT   COLUMN_ID
--------------------------------------------------------------------------------
IDCOUNTRYAREA        NUMBER(19,0)          No           (null)             1    
NOMEFOLDER           VARCHAR2(255 CHAR)    Yes          (null)             2    
COUNTRY_IDCOUNTRY    NUMBER(19,0)          Yes          (null)             3    

我認為這是正確的，因為在我看來，定義到KMCountryArea實體類中的3個字段已正確映射到KM_COUNTRY表中。

因此，我已經在KM_COUNTRY表中手動插入了一行（通過插入查詢，然后執行此簡單的select查詢）（在作為DBMS IDE的Oracle SQL Developer中）：

select * from KM_COUNTRY_AREA where nomefolder = 'BRAZIL';

我得到以下正確的結果：

IDCOUNTRYAREA        NOMEFOLDER      COUNTRY_IDCOUNTRY
------------------------------------------------------------
     2                 BRAZIL              715

現在，我必須使用JPQL做類似此查詢的操作，但是要獲取一組行（在前面的情況下，它只有一個，但是我可以獲取更多行）我想獲取具有已定義ID的KMCountry對象的列表（實體）等於COUNTRY_IDCOUNTRY值。

因此，如您所見，我實現了這個名為query的JPQL ：

@NamedQuery(name = "kmCountryListByName", query = "SELECT c FROM KMCountryArea c WHERE c.nomeFolder  = :nomeFolder order by c.idCountryArea")

然后，在我的項目中，我定義了執行上一個查詢的DAO服務，實現了這個具體的類：

@Repository("kmCountryAreaService")
@Transactional(propagation = Propagation.NOT_SUPPORTED)
public class KMCountryAreaServiceImpl extends AbstractService implements KMCountryAreaService {

    public List<KMCountry> getCountryListByName(String folderName){
        List<KMCountry> list = getHibernateTemplate().findByNamedQuery("kmCountryListByName");
        return list;
    }

}

如您所見，它被定義為Spring存儲庫，並在其中實現了KMCountryAreaService接口，我只列出了CRUD實施的方法（在此工作階段，僅存在getCountryListByName（） ）

好的，然后在我的代碼中（到動作類中）執行以下操作：

List<KMCountry> kmCountryListAssociated = kmCountryAreaService.getCountryListByName("BRAZIL", folderName);

因此，我希望將KMCountry對象的列表檢索到KM_COUNTRY表中，該列表的NOMEFOLDER字段值等於BRAZIL 。

但實際上，使用調試器無法正常工作，我看到執行進入了getCountryListByName（）方法，但是當它嘗試執行以下語句時：

List<KMCountry> list = getHibernateTemplate().findByNamedQuery("kmCountryListByName");

引發一個異常（但是它的消息不會被打印到堆棧跟蹤中）。

我想念什么？ 我該如何解決這個問題？ 我發瘋了，試圖了解問題所在。

特納克斯

編輯1 ：

我已經修改了getCountryListByName（）方法來跟蹤執行情況，現在我的方法是：

public List<KMCountry> getCountryListByName(String nomeFolder) {

    List<KMCountry> list = null;

    try{
        list = getHibernateTemplate().findByNamedQuery("kmCountryListByName", nomeFolder);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return list;
}

得到的排他是：

java.lang.IndexOutOfBoundsException: Remember that ordinal parameters are 1-based!
    at org.hibernate.engine.query.ParameterMetadata.getOrdinalParameterDescriptor(ParameterMetadata.java:55)
    at org.hibernate.engine.query.ParameterMetadata.getOrdinalParameterExpectedType(ParameterMetadata.java:61)
    at org.hibernate.impl.AbstractQueryImpl.determineType(AbstractQueryImpl.java:397)
    at org.hibernate.impl.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:369)
    at org.springframework.orm.hibernate3.HibernateTemplate$33.doInHibernate(HibernateTemplate.java:985)
    at org.springframework.orm.hibernate3.HibernateTemplate$33.doInHibernate(HibernateTemplate.java:1)
    at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
    at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
    at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedQuery(HibernateTemplate.java:979)
    at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedQuery(HibernateTemplate.java:975)
    at egp.prc.km.services.KMCountryAreaServiceImpl.getCountryListByName(KMCountryAreaServiceImpl.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy377.getCountryListByName(Unknown Source)
    at egp.prc.km.actions.countryArea.CountryAreaAction.showMultiSelectCountry(CountryAreaAction.java:205)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
    at egp.prc.km.utils.interceptors.LiferayAjaxInterceptor.intercept(LiferayAjaxInterceptor.java:28)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.servlet.StrutsServlet.service(StrutsServlet.java:76)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

Answer 1

您沒有將folderName傳遞到查詢中。 嘗試這個

List<KMCountry> list = getHibernateTemplate().findByNamedQueryAndNamedParam("kmCountryListByName", "nomeFolder", folderName);