Wu Yuxiong - natural born flyweight JAVA EE enterprise application development Struts2Sping4Hibernate Integrated Development Study Notes: Hibernate_1-N (composite-id)

<?xml version="1.0" encoding="GBK"?>
<project name="hibernate" basedir="." default="">
    <property name="src" value="src"/>
    <property name="dest" value="classes"/>

    <path id="classpath">
        <fileset dir="../../lib">
            <include name="**/*.jar"/>
        </fileset>
        <pathelement path="${dest}"/>
    </path>

    <target name="compile" description="Compile all source code">
        <delete dir="${dest}"/>
        <mkdir dir="${dest}"/>
        <copy todir="${dest}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>        
        </copy>
        <javac destdir="${dest}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src}"/>
            <classpath refid="classpath"/>
            <compilerarg value="-Xlint:deprecation"/>
        </javac>
    </target>

    <target name="run" description="Run the main class" depends="compile">
        <java classname="lee.PersonManager" fork="yes" failonerror="true">
            <classpath refid="classpath"/>
        </java>
    </target>

</project>

<?xml version="1.0" encoding="GBK"?>
<! - Specifies the Hibernate configuration file DTD information ->
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<-! Hibernate-configuration profile is the root element ->
<hibernate-configuration>
    <session-factory>
        <! - Specifies the database connection for driving ->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <! - url specified connection database, wherein the database is the name of the present application hibernate connection ->
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <! - Specifies the user name connected to the database ->
        <property name="connection.username">root</property>
        <! - Specifies the password for connecting to the database ->
        <property name="connection.password">32147</property>
        <! - Specifies the maximum number of connections the connection pool ->
        <property name="hibernate.c3p0.max_size">20</property>
        <! - specifies the minimum number of connections connecting pool ->
        <property name="hibernate.c3p0.min_size">1</property>
        <! - Specifies the time-out connection connected to the pool length ->
        <property name="hibernate.c3p0.timeout">5000</property>
        <! - Specifies the number of connection pool maximum cache Statement object ->
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.validate">true</property>
        <! - Specify the database dialect ->
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <-! Required automatically create the database ->
        <property name="hbm2ddl.auto">update</property>
        <! - Display Hibernate persistence operations generated SQL ->
        <property name="show_sql">true</property>
        <! - SQL script will be formatted and then output ->
        <property name="hibernate.format_sql">true</property>
        <! - class lists names of all persistent classes ->
        <mapping class="org.crazyit.app.domain.Person"/>
        <mapping class="org.crazyit.app.domain.Address"/>
    </session-factory>
</hibernate-configuration>

package lee;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.service.*;
import org.hibernate.boot.registry.*;
/**
 * Description:
 * <br/> website: <a href=" http://www.crazyit.org "> crazy Java league </a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * Author   YeekuHLee kongyeeku163com
 * @Version   1.0
  * / 
public  class HibernateUtil
{
    public static final SessionFactory sessionFactory;

    static
    {
        try
        {
            // create a Configuration instance using the default hibernate.cfg.xml configuration file 
            Configuration cfg = new new Configuration ()
                .configure();
            // to Configuration instance to create SessionFactory instance 
            ServiceRegistry ServiceRegistry = new new StandardServiceRegistryBuilder ()
                .applySettings(cfg.getProperties()).build();
            sessionFactory = cfg.buildSessionFactory(serviceRegistry);
        }
        catch (Throwable ex)
        {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    // the ThreadLocal can isolate a plurality of threads to share data, eliminating the need to thread synchronization 
    public  static  Final the ThreadLocal <the Session> the session
         = new new the ThreadLocal <the Session> ();

    public static Session currentSession()
        throws HibernateException
    {
        S the Session = Session.get ();
         // If the thread has not Session, create a new the Session 
        IF (S == null )
        {
            S = sessionFactory.openSession ();
             // the Session variables obtained ThreadLocal variable stored in the session in 
            session.set (s);
        }
        return s;
    }

    public static void closeSession()
        throws HibernateException
    {
        Session s = session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
}

package lee;

import org.hibernate.Transaction;
import org.hibernate.Session;

import java.util. * ;
import org.crazyit.app.domain. * ;
/ **
 * Description:
 * <br/> website: <a href=" http://www.crazyit.org "> crazy Java league </a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * Author   YeekuHLee kongyeeku163com
 * @version  1.0
 */
public class PersonManager
{
    public static void main(String[] args)
    {
        PersonManager mgr = new PersonManager();
        mgr.createAndStorePerson();
        HibernateUtil.sessionFactory.close();
    }
    private void createAndStorePerson()
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction();
        // 创建Person对象
        Person person = new Person();
        person.setAge ( 29 );
         // set values for the two members of the composite primary key 
        person.setFirst ( "crazyit.org" );
        person.setLast ( "Crazy Java Alliance" );
        A1 Address = new new Address ( "Tianhe" );
        a1.setPerson (person);
        A2 Address = new new Address ( "Shanghai Hongkou" );
        a2.setPerson (person);
        // first save the primary table entity 
        Session.save (Person);
         // then save the entity from the table 
        session.save (a1);
        session.save(a2);
        tx.commit();
        HibernateUtil.closeSession();
    }
}

package org.crazyit.app.domain;

import javax.persistence.*;
/**
 * Description:
 * <br/> website: <a href=" http://www.crazyit.org "> crazy Java league </a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * Author   YeekuHLee kongyeeku163com
 * @version  1.0
 */
@Entity
@Table(name="address_inf")
public class Address
{
    // identifier attribute 
    the @Id @Column (name = "address_id" )
    @GeneratedValue (at Strategy = GenerationType.IDENTITY)
     Private  int AddressID;
     // define the address details representatives of member variables 
    Private String addressDetail;
     // the Person entity records associated with the Address entity 
    the @ManyToOne (. TargetEntity = the Person class )
     // use @ JoinColumns comprising a plurality @JoinColumn define the foreign key column 
    @JoinColumns ({
         // Since the main table of the composite primary key (primary key a plurality of columns)
         // need to use the plurality @JoinColumn define the foreign key columns of the plurality of reference table person_inf primary key column 
        @JoinColumn (name = "person_first" 
            , the referencedColumnName = "First", = Nullable to false ),
        @JoinColumn(name="person_last"
            , referencedColumnName="last" , nullable=false)
    })
    Private the Person Person;
     // no argument constructor 
    public the Address ()
    {
    }
    // constructor to initialize all the member variables 
    public Address (String addressDetail)
    {
        this.addressDetail = addressDetail;
    }

    // AddressID setter and getter methods 
    public  void setAddressId ( int AddressID)
    {
        this.addressId = addressId;
    }
    public int getAddressId()
    {
        return this.addressId;
    }

    // addressDetail的setter和getter方法
    public void setAddressDetail(String addressDetail)
    {
        this.addressDetail = addressDetail;
    }
    public String getAddressDetail()
    {
        return this.addressDetail;
    }

    // the Person of the setter and getter methods 
    public  void setPerson (the Person the Person)
    {
        this.person = person;
    }
    public Person getPerson()
    {
        return this.person;
    }
}

package org.crazyit.app.domain;

import java.util. * ;

import javax.persistence.*;
/**
 * Description:
 * <br/> website: <a href=" http://www.crazyit.org "> crazy Java league </a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * Author   YeekuHLee kongyeeku163com
 * @version  1.0
 */
@Entity
@Table(name="person_inf")
public class Person
    implements java.io.Serializable
{
    // define the first member variables, as members of identifying attributes of 
    the @Id
     Private String first;
     // define the last member variables, as members of identifying attributes of 
    the @Id
     Private String last;
     Private  int Age;
     // All Address records associated with that entity Person entity 
    @OneToMany (. = the targetEntity the Address class , the mappedBy = "Person" 
        , Cascade = CascadeType.ALL in)
     Private the Set <the Address> Addresses
         = new new HashSet <> ();

    // First in the setter and getter methods 
    public  void setFirst (String First)
    {
        this.first = first;
    }
    public String getFirst()
    {
        return this.first;
    }

    // Last setter and getter methods 
    public  void setLast (String Last)
    {
        this.last = last;
    }
    public String getLast()
    {
        return this.last;
    }

    // Age of setter and getter methods 
    public  void setAge ( int Age)
    {
        this.age = age;
    }
    public int getAge()
    {
        return this.age;
    }

    // addresses的setter和getter方法
    public void setAddresses(Set<Address> addresses)
    {
        this.addresses = addresses;
    }
    public Set<Address> getAddresses()
    {
        return this.addresses;
    }

    // override equals () method, according to the judgment First, Last 
    public  Boolean the equals (Object obj)
    {
        if (this == obj)
        {
            return true;
        }
        if (obj != null && obj.getClass() == Person.class)
        {
            Person target = (Person)obj;
            return target.getFirst().equals(this.first)
                && target.getLast().equals(this.last);
        }
        return false;
    }

    // override hashCode () method, the value calculated according hashCode First, Last 
    public  int hashCode ()
    {
        return getFirst().hashCode() * 31
            + getLast().hashCode();
    }
}