[Mapping] Clause order-by dans le fichier de mapping

Bonjour,

J'ai une question à propos de la clause "order-by" dans une requete "one-to-many". J'ai une base de données contenant 3 tables : A, B et C. Le code des classes Java correspondant aux tables est le suivant :

Classe A:

Code:

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package database;
 
import java.util.Set;
 
public class A implements java.io.Serializable {
 
    private Integer id;
    private Set<B> listB;
 
    public A() {
    }
 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public Set<B> getListB() {
        return listB;
    }
 
    public void setListB(Set<B> listB) {
        this.listB = listB;
    }
 
}

Classe B :

Code:

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package database;
 
public class B implements java.io.Serializable {
 
    private Integer id;
    private A a;
    private C c;
 
    public B() {
    }
 
    public Integer getId() {
        return this.id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public A getA() {
        return a;
    }
 
    public void setA(A a) {
        this.a = a;
    }
 
    public C getC() {
        return c;
    }
 
    public void setC(C c) {
        this.c = c;
    }
}

Classe C :

Code:

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package database;
 
public class C implements java.io.Serializable {
 
    private Integer id;
    private int num;
 
    public C() {
    }
 
    public Integer getId() {
        return this.id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public int getNum() {
        return this.num;
    }
 
    public void setNum(int num) {
        this.num = num;
    }
}

Les fichiers de mapping sont les suivants :

Table A :

Code:

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="database">
    <class name="A" table="A">
        <id
            column="id"
            name="Id"
            type="integer"
        >
            <generator class="increment" />
        </id>
        <set name="listB" cascade="all, delete-orphan" inverse="true" lazy="true" fetch="select" order-by="c.Id asc">
            <key column="a_id"/>
            <one-to-many class="B"/>
        </set>
    </class>
</hibernate-mapping>

Table B :

Code:

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="database">
    <class name="B" table="B">
        <id
            column="id"
            name="Id"
            type="integer"
        >
            <generator class="increment" />
        </id>
        <many-to-one name="a" class="A" fetch="select">
            <column name="a_id" not-null="true" />
        </many-to-one>
        <many-to-one name="c" class="C" fetch="select">
            <column name="c_id" not-null="true" />
        </many-to-one>
    </class>
</hibernate-mapping>

Table C :

Code:

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="database">
    <class name="C" table="C">
        <id
            name="Id"
            type="integer"
            column="id"
        >
            <generator class="increment"/>
        </id>
        <property
            name="Num"
            column="num"
            type="integer"
            not-null="true"
            length="10"
        />
    </class>
</hibernate-mapping>

Ma question concerne la clause "order-by" dans le fichier A.hbm. J'aimerais
ordonner ma liste, non pas selon c.Id, mais selon c.Num, comme par exemple :

Code:

<set name="listB" cascade="all, delete-orphan" inverse="true" lazy="true" fetch="select" order-by="c.Num asc">

Cependant, lorsque j'écris ça, j'obtiens cette erreur :

Code:

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Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not initialize a collection: [database.A.listB#1]
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.loader.Loader.loadCollection(Loader.java:2069)
    at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:62)
    at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:628)
    at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
    at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1853)
    at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
    at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
    at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)
    at Test.main(Test.java:36)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'listb0_.c.Num' in 'order clause'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2322)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1849)
    at org.hibernate.loader.Loader.doQuery(Loader.java:718)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
    at org.hibernate.loader.Loader.loadCollection(Loader.java:2062)
    ... 8 more

Je commence à peine l'utilisation d'hibernate, j'ai vu des posts à propos de l'utilisation de la classe "Criteria", mais je ne vois pas comment je peux l'utiliser dans mon fichier de mapping.
A moins que je doive coder la requête dans le Java, mais dans ce cas, où dois-je le faire ?

Merci d'avance,

Lauriane