关于java：Hibernate多对多数据检索

public class User {
private Integer userID;
private String  userLoginEmail;
private String  password;
private Set<Contact> contactSet = new HashSet<Contact>();
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}

public class Contact implements Serializable {
private Integer contactID;
private String  givenName;
private String  familyName;
private Set<User>   userSet = new HashSet<User>();
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}

<class name="User" table="USERACCOUNT">
    <id column="USER_ID" length="500" name="userID">
        <generator class="increment" />
    </id>
    <property column="USER_LOGIN_EMAIL" generated="never" lazy="false" length="100" name="userLoginEmail" />
    <property column="USER_FIRSTNAME" generated="never" lazy="false" length="100" name="userFirstName" />
    <property column="USER_LASTNAME" generated="never" lazy="false" length="100" name="userLastName" />
    <set name="contactSet" table="USER_CONTACT" inverse="false" lazy="false" fetch="select" cascade="all">
        <key column="USER_ID"/>
        <many–to–many column="CONTACT_ID" class="com.smallworks.model.Contact"/>
    </set>
</class>

 <class name="Contact" table="CONTACT">
  <id column="CONTACT_ID" length="500" name="contactID">
   <generator class="increment"/>
  </id>
  <property column="GIVEN_NAME" generated="never" lazy="false"  length="100" name="givenName"/>
  <property column="FAMILY_NAME" generated="never" lazy="false" length="100" name="familyName"/>

  <!– many to many mapping with the User via User_Contact table –>
  <set inverse="true" lazy="false" name="userSet" sort="unsorted" table="USER_CONTACT">
    <key column="USER_ID"/>
    <many–to–many class="com.smallworks.model.Contact" column="CONTACT_ID" unique="false"/>
  </set>
</class>

List contactList = session.createQuery("from Contact").list();

// First, retrieve the user you want.
User user = (User) session.get(User.class, user_id_you_want);
// Second, get the contacts of that given user and add them to a list (optional)
List contacts = new ArrayList();
contacts.addAll(user.getContactSet());
return contacts;