Cascade query for Hibernate single entity

In fact, one-to-many and many-to-one and 2-entity usage is the same, now take the user as an example:

Java code:

Package Com.test.bean;

Import Java.util.Set;

public class User
{
Private Integer ID;
Private String FirstName;
Private String LastName;
Private Integer ParentID;
private int age;
Private Set Childrens;
private user user;

Public Set Getchildrens () {
return childrens;
}

public void Setchildrens (Set childrens) {
This.childrens = childrens;
}

Public User GetUser () {
return user;
}

public void SetUser (user user) {
This.user = user;
}

Public Integer getId ()
{
return ID;
}

public void SetId (Integer ID)
{
This.id = ID;
}

Public String Getfirstname ()
{
return FirstName;
}

public void Setfirstname (String firstname)
{
This.firstname = FirstName;
}

Public String Getlastname ()
{
return lastname;
}

public void Setlastname (String lastname)
{
This.lastname = LastName;
}

public int Getage ()
{
return age;
}

public void Setage (int.)
{
This.age = age;
}

Public Integer Getparentid () {
return parentid;
}

public void Setparentid (Integer parentid) {
This.parentid = ParentID;
}

}

The corresponding HBM files:

<?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" >

<class name= "Com.test.bean.User" table= "Users" >
<id name= "id" type= "java.lang.Integer" column= "id" >
<generator class= "Increment" ></generator>
</id>

<property name= "FirstName" type= "string" column= "FirstName"
Length= ">"
</property>
<property name= "LastName" Type= "string" column= "LastName"
Length= ">"
</property>
<property name= "Age" type= "Java.lang.Integer" column= "Age" ></property>

<set name= "childrens" inverse= "true"
Lazy= "false" where= "age=4" >
<key>
<column name= "ParentID"/>
</key>
<one-to-many class= "Com.test.bean.User"/>
</set>
<many-to-one name= "user" column= "parentid" class= "Com.test.bean.User" ></many-to-one>

</class>

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