Hibernate逍遥游记-第4章映射对象标识符-increment、identity、hilo、native、assigned、sequence、<meta>

1.

package mypack;

import java.lang.reflect.Constructor;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import java.io.*;
import java.sql.Time;
import java.util.*;

public class BusinessService{
  public static SessionFactory sessionFactory;
  static{
     try{
      Configuration config = new Configuration().configure();
      sessionFactory = config.buildSessionFactory();
    }catch(RuntimeException e){e.printStackTrace();throw e;}
  }

  public void findAllObjects(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try {
      tx = session.beginTransaction();
      List objects=session.createQuery("from " +className).list();
      for (Iterator it = objects.iterator(); it.hasNext();) {
         Long id=new Long(0);
         if(className.equals("mypack.NativeTester"))
           id=((NativeTester) it.next()).getId();
         if(className.equals("mypack.IncrementTester"))
           id=((IncrementTester) it.next()).getId();
         if(className.equals("mypack.IdentityTester"))
           id=((IdentityTester) it.next()).getId();
         if(className.equals("mypack.HiloTester"))
           id=((HiloTester) it.next()).getId();

         System.out.println("ID of "+ className+":"+id);
      }

      tx.commit();

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

  public void saveObject(Object object){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try {
      tx = session.beginTransaction();
      session.save(object);
      tx.commit();

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

  public void deleteAllObjects(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try {
      tx = session.beginTransaction();
      Query query=session.createQuery("delete from " +className); 
      query.executeUpdate();
      tx.commit();

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

  public void test(String className) throws Exception{
    deleteAllObjects(className);
    Object o1=Class.forName(className).newInstance();
    saveObject(o1);
    Object o2=Class.forName(className).newInstance();
    saveObject(o2);
    Object o3=Class.forName(className).newInstance();
    saveObject(o3);
    findAllObjects(className);

  }

  public static void main(String args[])throws Exception {
    String className;
    if(args.length==0)
      className="mypack.NativeTester";
    else
      className=args[0];
    new BusinessService().test(className);

    sessionFactory.close();
  }
}

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.HiloTester"  table="HILO_TESTER">
    
    <id name="id" type="long" column="ID">
    <generator class="hilo">
                <param name="table">hi_value</param>
                <param name="column">next_value</param>
                <param name="max_lo">100</param>
        </generator>
    </id>

    <property name="name" type="string" column="NAME" />
     
  </class>
 
</hibernate-mapping>

3.

package mypack;
public class HiloTester  {
    private Long id;
    private String name;

    public HiloTester() {
    }

    public HiloTester(String name) {
       this.name = name;
    }
   
    public Long getId() {
        return this.id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }




}

4.

<?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.IdentityTester"  table="IDENTITY_TESTER">
    
    <id name="id" type="long" column="ID">
      <generator class="identity"/>
    </id>

    <property name="name" type="string" column="NAME" />
     
  </class>
 
</hibernate-mapping>

5.

<?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.IncrementTester" table="INCREMENT_TESTER" >
    
    <id name="id" type="long" column="ID">
      <meta attribute="scope-set">private</meta>
      <generator class="increment"/>
    </id>

    <property name="name" type="string" column="NAME" />
     
  </class>
 
</hibernate-mapping>

6.

<?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.NativeTester" table="NATIVE_TESTER" >
    
    <id name="id" type="long" column="ID">
      <generator class="native"/>
    </id>

    <property name="name" type="string" column="NAME" />
     
  </class>
 
</hibernate-mapping>

7.

<?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/HiloTester.hbm.xml" />
        <mapping resource="mypack/IdentityTester.hbm.xml" />
        <mapping resource="mypack/IncrementTester.hbm.xml" />
        <mapping resource="mypack/NativeTester.hbm.xml" />
    </session-factory>
</hibernate-configuration>

8.

use sampledb;

drop table if exists HILO_TESTER;
drop table if exists IDENTITY_TESTER;
drop table if exists INCREMENT_TESTER;
drop table if exists NATIVE_TESTER;
drop table if exists hi_value;
create table HILO_TESTER (ID bigint not null, name varchar(15), primary key (ID));
create table IDENTITY_TESTER (ID bigint not null auto_increment, name varchar(15), primary key (ID));
create table INCREMENT_TESTER (ID bigint not null, NAME varchar(15), primary key (ID));
create table NATIVE_TESTER (ID bigint not null auto_increment, name varchar(15), primary key (ID));
create table hi_value ( next_value integer );
insert into hi_value values ( 0 );

9.

<?xml version="1.0"?>
<project name="Learning Hibernate" default="prepare" basedir=".">

  <!-- Set up properties containing important project directories -->
  <property name="source.root" value="src"/>
  <property name="class.root" value="classes"/>
  <property name="lib.dir" value="lib"/>
  <property name="schema.dir" value="schema"/>

  <!-- Set up the class path for compilation and execution -->
  <path id="project.class.path">
      <!-- Include our own classes, of course -->
      <pathelement location="${class.root}" />
      <!-- Include jars in the project library directory -->
      <fileset dir="${lib.dir}">
        <include name="*.jar"/>
      </fileset>
  </path>


  <!-- Create our runtime subdirectories and copy resources into them -->
  <target name="prepare" description="Sets up build structures">
    <delete dir="${class.root}"/>
    <mkdir dir="${class.root}"/>

    <!-- Copy our property files and O/R mappings for use at runtime -->
    <copy todir="${class.root}" >
      <fileset dir="${source.root}" >
        <include name="**/*.properties"/>
        <include name="**/*.hbm.xml"/>
        <include name="**/*.cfg.xml"/>
      </fileset>
    </copy>
  </target>


 <!-- Compile the java source of the project -->
  <target name="compile" depends="prepare"
          description="Compiles all Java classes">
    <javac srcdir="${source.root}"
           destdir="${class.root}"
           debug="on"
           optimize="off"
           deprecation="on">
      <classpath refid="project.class.path"/>
    </javac>
  </target> 


  <target name="run_increment" description="Run a Hibernate sample"
          depends="compile">
   <java classname="mypack.BusinessService" fork="true">
      <arg value="mypack.IncrementTester" />
      <classpath refid="project.class.path"/>
   </java>
  </target>

  <target name="run_identity" description="Run a Hibernate sample"
          depends="compile">
   <java classname="mypack.BusinessService" fork="true">
      <arg value="mypack.IdentityTester" />
      <classpath refid="project.class.path"/>
   </java>
  </target>


  <target name="run_hilo" description="Run a Hibernate sample"
          depends="compile">
   <java classname="mypack.BusinessService" fork="true">
      <arg value="mypack.HiloTester" />
      <classpath refid="project.class.path"/>
   </java>
  </target>

  <target name="run_native" description="Run a Hibernate sample"
          depends="compile">
   <java classname="mypack.BusinessService" fork="true">
      <arg value="mypack.NativeTester" />
      <classpath refid="project.class.path"/>
   </java>
  </target>

</project>