Hibernate Criteria的嵌套查询

假设有Artist和Track实体，是1对多的关系，现在我们想使用Criteria查询所有artist中，其对应的Track实体集合中，有名为track1的Track实体所对应的Artist

比较乱，用SQL来举例

只有artist1和artist2对应的track集合中1有名为“track1”的记录，我们就要找出artist1和artist2来

create   table  artist(id  varchar ( 20 ),name  varchar ( 20 ));
create   table  track (id  varchar ( 20 ),name  varchar ( 20 ),artist_id  varchar ( 20 ));

insert   into  artist  values (" 1 ","artist1");
insert   into  artist  values (" 2 ","artist2");
insert   into  artist  values (" 3 ","artist3");


insert   into  track  values (" 1 ","track1"," 1 ");
insert   into  track  values (" 2 ","track2"," 1 ");
insert   into  track  values (" 3 ","track3"," 1 ");

insert   into  track  values (" 4 ","track1"," 2 ");

insert   into  track  values (" 5 ","track4"," 3 ");
insert   into  track  values (" 6 ","track5"," 3 ");

 

 pojo:

 

package  RelationCriteria;

import  java.util.Set;

public   class  Artist  ... {
   private String id;
   private String name;
   private Set tracks;
public String getId() ...{
    return id;
}
public void setId(String id) ...{
    this.id = id;
}
public String getName() ...{
    return name;
}
public void setName(String name) ...{
    this.name = name;
}
public Set getTracks() ...{
    return tracks;
}
public void setTracks(Set tracks) ...{
    this.tracks = tracks;
}
}



package  RelationCriteria;

public   class  Track  ... {
   private String id;
   private String name;
   private Artist artist;
public String getId() ...{
    return id;
}
public void setId(String id) ...{
    this.id = id;
}
public String getName() ...{
    return name;
}
public void setName(String name) ...{
    this.name = name;
}
public Artist getArtist() ...{
    return artist;
}
public void setArtist(Artist artist) ...{
    this.artist = artist;
}
}

 

Artist.hbm.xml

 

<? xml version="1.0" encoding="utf-8" ?>
<! DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<!--  
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
< hibernate-mapping  package ="RelationCriteria"   >
     < class  name ="RelationCriteria.Artist"  table ="artist"  lazy ="true" >
        < id  name ="id"  column ="id" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >
        < property  name ="name"  column ="name" ></ property >
        < set  name ="tracks"  lazy ="true"  inverse ="true"  outer-join ="false" >
          < key  column ="artist_id" ></ key >
          < one-to-many  class ="RelationCriteria.Track" />
        </ set >
       </ class >
</ hibernate-mapping >

 

Track.hbm.xml

 

<? xml version="1.0" encoding="utf-8" ?>
<! DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<!--  
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
< hibernate-mapping  package ="RelationCriteria"   >
   
     < class  name ="RelationCriteria.Track"  table ="track"  lazy ="true" >
        < id  name ="id"  column ="id"  unsaved-value ="null" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >

        < property  name ="name"  column ="name" ></ property >
        < many-to-one  name ="artist"  
                    column ="artist_id"
                    outer-join ="true"  
                    class ="RelationCriteria.Artist" ></ many-to-one >
       </ class >
</ hibernate-mapping >

 

Hibernate.cfg.xml

 

<? xml version='1.0' encoding='UTF-8' ?>
<! DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >

<!--  Generated by MyEclipse Hibernate Tools.                    -->
< hibernate-configuration >

< session-factory >
     < property  name ="connection.username" > root </ property >
     < property  name ="connection.url" >
        jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312 &amp; useUnicode=true
     </ property >
     < property  name ="dialect" >
        org.hibernate.dialect.MySQLDialect
     </ property >
     < property  name ="myeclipse.connection.profile" > mysql </ property >
     < property  name ="connection.password" > 1234 </ property >
     < property  name ="connection.driver_class" >
        com.mysql.jdbc.Driver
     </ property >
     < property  name ="hibernate.dialect" >
        org.hibernate.dialect.MySQLDialect
     </ property >
     < property  name ="hibernate.show_sql" > true </ property >
     < property  name ="current_session_context_class" > thread </ property >
     < mapping  resource ="RelationCriteria/Artist.hbm.xml"   />
     < mapping  resource ="RelationCriteria/Track.hbm.xml"   />

</ session-factory >

</ hibernate-configuration >

 

测试代码：

 

package  RelationCriteria;

import  java.io.File;
import  java.util.Iterator;
import  java.util.List;

import  org.hibernate.Criteria;
import  org.hibernate.Session;
import  org.hibernate.SessionFactory;
import  org.hibernate.Transaction;
import  org.hibernate.cfg.Configuration;
import  org.hibernate.criterion.Expression;

;

public   class  Test  ... {


    public static void<spa>