Hibernate逍遥游记-第3章对象-关系映射基础-access="field"、dynamic-insert、dynamic-update、formula、update=false

1.

 package mypack;

 import java.util.*;

 public class Monkey{

   private Long id;
   private String firstname;
   private String lastname;
   private char gender;
   private int age;
   private int avgAge;
   private String description;

   public Monkey() {}

   public Monkey(String firstname,String lastname,char gender,int age,String description){
     this.firstname=firstname;
     this.lastname=lastname;
     this.gender=gender;
     this.age=age;
     this.description=description;
   }

   public Long getId() {
     return this.id;
   }

   private void setId(Long 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 String getName(){
     return firstname+ " "+lastname;
   }

   public void setName(String name){
     StringTokenizer t=new StringTokenizer(name);
     firstname=t.nextToken();
     lastname=t.nextToken();
   }

   public int getAge(){
     return this.age;
   }

   public void setAge( int age ){
     this.age = age;
   }

   public int getAvgAge(){
     return this.avgAge;
   }

   private void setAvgAge( int avgAge){
     this.avgAge = avgAge;
   }

   public char getGender(){
     return this.gender;
   }

   public void setGender(char gender){
     if(gender!='F' && gender!='M'){
       throw new IllegalArgumentException("Invalid Gender");
     }
     this.gender =gender ;
   }

   public String getDescription(){
     return this.description;
   }

   public void setDescription(String description){
     this.description=description;
   }
 }

2.

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

 <hibernate-mapping>

   <class name="mypack.Monkey" table="MONKEYS" dynamic-insert="true" dynamic-update="true" >
     <id name="id">
       <generator class="increment"/>
     </id>

     <property name="name" column="NAME" />
     <property name="gender" column="GENDER" access="field" />
     <property name="age" column="AGE" />

     <property name="avgAge"
        formula="(select avg(m.AGE) from MONKEYS m)" />

    <property name="description"  type="text" column="`MONKEY  DESCRIPTION`"/>

  </class>
 </hibernate-mapping>

3.

 package mypack;

 import org.hibernate.*;
 import org.hibernate.cfg.Configuration;
 import java.util.*;

 public class BusinessService{
   public static SessionFactory sessionFactory;
   static{
      try{
        Configuration config = new Configuration()
                               .configure(); //加载hibernate.cfg.xml文件中配置的信息
       sessionFactory = config.buildSessionFactory();
     }catch(RuntimeException e){e.printStackTrace();throw e;}
   }

   public Monkey loadMonkey(long monkey_id){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       Monkey monkey=(Monkey)session.get(Monkey.class,new Long(monkey_id));
       tx.commit();
       return monkey;
     }catch (RuntimeException e) {
       if (tx != null) {
          tx.rollback();
       }
       throw e;
     } finally {
        session.close();
     }
   }

   public void saveMonkey(Monkey monkey){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       session.save(monkey);
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
          tx.rollback();
       }
       throw e;
     } finally {
        session.close();
     }
   }

   public void loadAndUpdateMonkey(long monkeyId) {
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       Monkey monkey=(Monkey)session.get(Monkey.class,new Long(monkeyId));
       monkey.setDescription("勇敢无畏!");
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   public void updateMonkey(Monkey monkey){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       session.update(monkey);
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
          tx.rollback();
       }
       throw e;
     } finally {
        session.close();
     }
   }

   public void printMonkey(Monkey monkey){
     System.out.println("name:"+monkey.getName());
     System.out.println("gender:"+monkey.getGender());
     System.out.println("description:"+monkey.getDescription());
     System.out.println("age:"+monkey.getAge());
     System.out.println("avgAge:"+monkey.getAvgAge());
   }

    public void test(){
       Monkey monkey=new Monkey("悟空","孙",'M',500,"神通广大!");
       saveMonkey(monkey);

       monkey=loadMonkey(1);
       printMonkey(monkey);

       monkey.setDescription("齐天大圣!");
       updateMonkey(monkey);
       printMonkey(monkey);

       loadAndUpdateMonkey(1);
       printMonkey(monkey);
    }

   public static void main(String args[]) {
     new BusinessService().test();
     sessionFactory.close();
   }
 }

4.

 <?xml version="1.0" encoding="utf-8" ?>
 <!DOCTYPE hibernate-configuration
  PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 <hibernate-configuration>
     <session-factory>
         <property name="dialect">
             org.hibernate.dialect.MySQLDialect
         </property>
         <property name="connection.driver_class">
             com.mysql.jdbc.Driver
         </property>
         <property name="connection.url">
             jdbc:mysql://localhost:3306/sampledb
         </property>
         <property name="connection.username">
             root
         </property>
         <property name="connection.password">
             1234
         </property>
         <property name="show_sql">true</property>
         <mapping resource="mypack/Monkey.hbm.xml" />
     </session-factory>
 </hibernate-configuration>

5.

 drop database if exists SAMPLEDB;
 create database SAMPLEDB;
 use SAMPLEDB;

 create table MONKEYS (
    ID bigint not null,
    NAME varchar(15),
    GENDER char(1),
    AGE int,
    `MONKEY  DESCRIPTION` text,
    primary key (id)
 );