5.7 ing component attributes: The child attributes of the component attributes are of the basic type.

Component PropertiesThe persistence class is not a basic data type, nor a string, date, or other scalar type variable, but a composite type object. During the persistence process, it is only treated as a value type, rather than referencing another persistent entity.

To map component attributes, Hibernate provides<Component.../>Each <component.../> element maps a component property. When you use <component.../> to map component attributes, you must specify a name attribute to specify the attribute name of the component.

A custom class usually has its own attributes. If its attributes are of the basic type, string type, or date type, you can set it to <component... /> Add <property... /> child meta maps child attributes of component attributes. If the sub-attribute is not of the basic type, string type, or date type, the following sub-elements can appear in the <component.../> element:

Child element of <component.../>

<Component.../>	If the sub-attribute is of another component type, use the <component.../> sub-element again in <component.../> to map
Set ing Element	If the sub-attribute is of the array type or set type, you can... /> use <set... />, <list... />, <map... /> And other sub-elements map these set attributes.
Associate a ing Element	If the sub-attribute is referenced by another persistent instance, you can... />, use <role-to-one... />, <one-to-one... />.

Delete the table in the test database first:

Create a new web project and write the code:

Person. Java:

public class Person {private int id;private int age;private Name name;public int getId() {return id;}public void setId(int id) {this.id = id;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Name getName() {return name;}public void setName(Name name) {this.name = name;}}

Name. Java:

public class Name {private String firstname;private String lastname;private Person owner;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 Person getOwner() {return owner;}public void setOwner(Person owner) {this.owner = owner;}}

Person. HBM. xml:

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">    
Test. Java:

Public class test {public static void main (string [] ARGs) {person p1 = new person (); p1.setage (20); Name name1 = new name (); name1.setfirstname (""); name1.setlastname (""); p1.setname (name1); person P2 = new person (); p2.setage (25); Name name2 = new name (); name2.setfirstname ("Cao"); name2.setlastname ("Mengde"); p2.setname (name2); Session session = hibernatesessionfactory. getsession (); transaction TXT = session. begintransaction (); Session. save (P1); Session. save (P2); TXT. commit (); hibernatesessionfactory. closesession ();}}
Run test. Java to view the database: