Question

我想删除用户是其所有者的所有组，但此时它不起作用。我认为在映射User.hbm.xml或Group.hbm.xml的层面上缺少某些东西，但我不知道。错误是“无法删除或更新父行：外键约束失败（sharedmap。groupe，CONSTRAINT FK_gq7win10rtxufsxu1n5istm2p FOREIGN KEY（user_id）REFERENCES {{ 1}}（user））“

以下是有关的类和文件xml：

User.java

id

userDAO的

public class User {

    /** Attributs */ 


    @XmlTransient
    private Set<Group> proprietaire;

    /** Constructeur */ 
    public User() {
    }

    public User(String telephone, String pseudo, String email) {
        super();
        this.pseudo = pseudo;
        this.telephone = telephone;
        this.email = email;
    }


    public Set<Group> getProprietaire() {
        return proprietaire;
    }

    public void setProprietaire(Set<Group> proprietaire) {
        this.proprietaire = proprietaire;
    }

    ...

}

User.hbm.xml

public class UserDao {

    private static SessionFactory sessionFactory = SessionConfiguration.getFactory();

    /**
     * Method to ADD a user in the database
     * 
     * @param user
     * @return user_id
     */
    public static Integer addUser(User user) {
        Integer userID = null;
        Session session = sessionFactory.openSession();
        Transaction tx = null;

        try {
            tx = session.beginTransaction();
            userID = (Integer) session.save(user);          
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
        return userID;
    }

    /**
     * 
     * Method to DELETE a user from the records
     * 
     * @param telephone
     */
    public static void deleteUser(String telephone) {
        Session session = sessionFactory.openSession();
        Transaction tx = null;
        String query = "select u from User u where u.telephone = :telephone";
        User user = (User) session.createQuery(query)
                .setString("telephone", telephone).uniqueResult();
        try {
            tx = session.beginTransaction();
            session.delete(user);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }
}

Group.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping>
   <class name="modele.User" table="user">
      <meta attribute="class-description">
         This class contains the user detail. 
      </meta>
      <id name="id" type="int" column="id">
         <generator class="native"/>
      </id>
      <property name="pseudo" column="pseudo" type="string"/>
      <property name="telephone" column="telephone" type="string" not-null="true" unique="true"/>
      <property name="email" column="email" type="string"/>

      <!--  Mapping Set<Demande> demandes -->
      <set name="demandes" cascade="save-update,delete" lazy="false">
         <key column="demandeur_id"/>        
         <one-to-many class="modele.Demande"/>
      </set>

      <!--  Mapping Set<Invitation> aInvite -->
      <set name="aInvite" cascade="save-update,delete" lazy="false">
         <key column="inviteur_id"/>
         <one-to-many class="modele.Invitation"/>
      </set>

      <set name="notifications" cascade="save-update,delete" lazy="false">
         <key column="user_id"/>
         <one-to-many class="modele.Notification"/>
      </set>


      <set name="groups"  table="participation" lazy="false" inverse="true">
         <key column="user_id"/>
         <many-to-many column="group_id" class="modele.Group"/>
      </set>

     <!--  Mapping Set<Group> proprietaire -->
      <set name="proprietaire" cascade="save-update,delete" lazy="false">
         <key column="user_id"/>
         <one-to-many class="modele.Group"/>
      </set>      

   </class>
</hibernate-mapping>

UserDaoTest.java

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping>
   <class name="modele.Group" table="groupe">
      <meta attribute="class-description">
         This class contains the publicEvent detail. 
      </meta>
      <id name="id" type="int" column="id">
         <generator class="native"/>
      </id>
      <property name="description" column="description" type="string"/>
      <property name="hashtag" column="hashtag" type="string"/>
      <property name="password" column="password" type="string"/>
      <!--  Mapping ArrayList<Marqueur> marqueurs -->

      <set name="marqueurs" cascade="save-update,delete" lazy="false">
         <key column="group_id"/>
         <one-to-many class="modele.Marqueur"/>
      </set>
      <!--  Mapping Set<Invitation> invitations -->
      <set name="invitations" cascade="save-update,delete" lazy="false">
         <key column="group_id"/>
         <one-to-many class="modele.Invitation"/>
      </set>

      <!--  Mapping Set<Demande> demandes -->
      <set name="demandes" cascade="save-update,delete" lazy="false">
         <key column="group_id"/>
         <one-to-many class="modele.Demande"/>
      </set>

      <!--  Mapping User proprietaire -->
      <many-to-one name="proprietaire" class="modele.User" column="user_id" not-null="true"/>

      <!--  Mapping ArrayList<User> invites -->
      <set name="invites" table="participation" lazy="false">
         <key column="group_id"/>
         <many-to-many column="user_id" class="modele.User"/>
      </set>

   </class>
</hibernate-mapping>

Answer 1

请尝试将inverse = true添加到用户文件集名称，并使用cascade = all“，delete-orphan

删除用户时删除组。另外请非常小心你如何在Hibernate中删除用户：

在删除用户之前必须刷新会话链接到您的用户的所有组必须从所有活动会话和二级缓存中逐出。

无法删除或更新父行：外键约束失败（hibernate xml mapping）

1 个答案: