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>