Ich bin neu bei Hibernate und habe eine Frage zu HQL Left Join.

Ich versuche, zwei Tische zu betreten, Patient und Anbieter, und erhalte weiterhin "Pfad für Beitritt erwartet!" Fehler in der zweiten Tabelle. Schätzen Sie es, wenn jemand in dieser Angelegenheit helfen kann!

Hier ist die Zuordnung der 2 Tabellen / Klassen:

patient.hbm.xmL:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.ccg.db.test">
    <class name="patient" table="patient">
        <id name="patientId" column="patientId" type="int">
            <generator class="native"/>
        </id>
        <property name="patientName" type="string" >
           <column name="patientName" /> 
        </property>
        <property name="providerId" type="string" >
            <column name="provId" /> 
        </property>
        <many-to-one name="provider" column="providerId" class="provider" /> 
    </class>
</hibernate-mapping>

provider.hbm.xml:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.ccg.db.test">
    <class name="provider" table="provider">
        <id name="providerId" column="providerId">
            <generator class="native" />
        </id>
        <property name="providerName" column="providerName" />
    </class>
</hibernate-mapping>

pojo:

patient.java

package com.ccg.db.test;

import java.io.Serializable;
import java.util.List;
import org.hibernate.Session;

public class patient 
implements Serializable
{
    private int patientId;
    private String patientName;
    private String providerId; // foreign key to provider

    private static final long serialVersionUID = 81073;

    public static void load(Session session, List<String> values){
        patient PatientInfo = new patient(); 

        PatientInfo.setPatientId(Integer.parseInt(values.get(0)));
        PatientInfo.setPatientName( values.get(1));
        PatientInfo.setProviderId( values.get(2) );

        session.save( PatientInfo );
    }

    /**
    * @return the PatientId
    */
    public int getPatientId() {
        return patientId;
    }

    /**
    * @param PatientId the PatientId to set
    */
    public void setPatientId(int PatientId) {
        this.patientId = PatientId;
    }

    /**
    * @return the PatientName
    */
    public String getPatientName() {
        return this.patientName;
    }

    /**
    * @param PatientName the PatientName to set
    */
    public void setPatientName(String PatientName) {
        this.patientName = PatientName;
    }

    /**
    * @return the ProvId
    */
    public String getProviderId() {
        return this.providerId;
    }

    /**
    * @param id the ProviderId to set
    */
    public void setProviderId( String id ) {
        this.providerId = id;
    }

    /**
    * @return the ProvId
    */
    public String getProvider() {
        return this.providerId;
    }

    /**
    * @param id the ProviderId to set
    */
    public void setProvider( String id ) {
        this.providerId = id;
    }  

    /**
    * @param args
    */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    }
}

provider.java:

package com.ccg.db.test;

import java.io.Serializable;
import java.util.List;

import org.hibernate.Session;

public class provider 
implements Serializable
{
    private String providerId;
    private String providerName;

    //private int patientId;
    //private int providerSpec; 

    private static final long serialVersionUID = 81073;

    public static void load(Session session, List<String> values){
        provider ProviderInfo = new provider(); 

        ProviderInfo.setProviderId( values.get(0) );
        ProviderInfo.setProviderName( values.get(1));
        //ProviderInfo.setProviderSpec( Integer.parseInt(values.get(2)) );

        session.save( ProviderInfo );
    }

    /**
    * @return the ProviderName
    */
    public String getProviderName() {
        return providerName;
    }

    /**
    * @param ProviderName the ProviderName to set
    */
    public void setProviderName(String name) {
        this.providerName = name;
    }

    /**
    * @return the ProvId
    */
    public String getProviderId() {
        return this.providerId;
    }

    /**
    * @param id the ProvId to set
    */
    public void setProviderId( String id ) {
        this.providerId = id;
    }

    /*
    public int getPatientId() {
        return this.patientId;
    }

    public void setPatientId( int id ) {
        this.patientId = id;
    }
    */

    /**
    * @param args
    */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    }
}

Hier ist die linke Join-Abfrage:

select
    pat.patientId, pat.patientName
from
    patient as pat 
left join
    provider as pro 
where
    pat.providerId = pro.providerId

und hier ist das Ergebnis:

0:50:08,479 INFO query:156 - Query = outerJoin
10:50:08,479 INFO query:157 - select
pat.patientId, pat.patientName
from
patient as pat 
left join
provider as pro 
where
pat.providerId = pro.providerId

10:50:08,698 ERROR PARSER:33 - Path expected for join!
10:50:08,698 ERROR PARSER:33 - Invalid path: 'pro.providerId'
10:50:08,698 ERROR PARSER:33 - right-hand operand of a binary operator was null
10:50:08,698 ERROR query:184 - Problem generating query.
org.hibernate.hql.ast.QuerySyntaxException: Path expected for join! [select
pat.patientId, pat.patientName
from
com.ccg.db.test.patient as pat 
left join
provider as pro 
where
pat.providerId = pro.providerId
]
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:31)
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:24)
at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:59)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:235)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
at org.hibernate.engine.query.HQLQueryPlan.(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
at com.ccg.db.query.QueryManager.query(QueryManager.java:163)
at com.ccg.db.query.QueryManager.query(QueryManager.java:139)
at com.ccg.db.query.QueryManager.main(QueryManager.java:80)