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;
  2 
  3 import java.lang.reflect.Constructor;
  4 import org.hibernate.*;
  5 import org.hibernate.cfg.Configuration;
  6 import java.io.*;
  7 import java.sql.Time;
  8 import java.util.*;
  9 
 10 public class BusinessService{
 11   public static SessionFactory sessionFactory;
 12   static{
 13      try{
 14       Configuration config = new Configuration().configure();
 15       sessionFactory = config.buildSessionFactory();
 16     }catch(RuntimeException e){e.printStackTrace();throw e;}
 17   }
 18 
 19   public void findAllObjects(String className){
 20     Session session = sessionFactory.openSession();
 21     Transaction tx = null;
 22     try {
 23       tx = session.beginTransaction();
 24       List objects=session.createQuery("from " +className).list();
 25       for (Iterator it = objects.iterator(); it.hasNext();) {
 26          Long id=new Long(0);
 27          if(className.equals("mypack.NativeTester"))
 28            id=((NativeTester) it.next()).getId();
 29          if(className.equals("mypack.IncrementTester"))
 30            id=((IncrementTester) it.next()).getId();
 31          if(className.equals("mypack.IdentityTester"))
 32            id=((IdentityTester) it.next()).getId();
 33          if(className.equals("mypack.HiloTester"))
 34            id=((HiloTester) it.next()).getId();
 35 
 36          System.out.println("ID of "+ className+":"+id);
 37       }
 38 
 39       tx.commit();
 40 
 41     }catch (RuntimeException e) {
 42       if (tx != null) {
 43         tx.rollback();
 44       }
 45       throw e;
 46     } finally {
 47       session.close();
 48     }
 49   }
 50 
 51   public void saveObject(Object object){
 52     Session session = sessionFactory.openSession();
 53     Transaction tx = null;
 54     try {
 55       tx = session.beginTransaction();
 56       session.save(object);
 57       tx.commit();
 58 
 59     }catch (RuntimeException e) {
 60       if (tx != null) {
 61         tx.rollback();
 62       }
 63       throw e;
 64     } finally {
 65       session.close();
 66     }
 67   }
 68 
 69   public void deleteAllObjects(String className){
 70     Session session = sessionFactory.openSession();
 71     Transaction tx = null;
 72     try {
 73       tx = session.beginTransaction();
 74       Query query=session.createQuery("delete from " +className); 
 75       query.executeUpdate();
 76       tx.commit();
 77 
 78     }catch (RuntimeException e) {
 79       if (tx != null) {
 80         tx.rollback();
 81       }
 82       throw e;
 83     } finally {
 84       session.close();
 85     }
 86   }
 87 
 88   public void test(String className) throws Exception{
 89     deleteAllObjects(className);
 90     Object o1=Class.forName(className).newInstance();
 91     saveObject(o1);
 92     Object o2=Class.forName(className).newInstance();
 93     saveObject(o2);
 94     Object o3=Class.forName(className).newInstance();
 95     saveObject(o3);
 96     findAllObjects(className);
 97 
 98   }
 99 
100   public static void main(String args[])throws Exception {
101     String className;
102     if(args.length==0)
103       className="mypack.NativeTester";
104     else
105       className=args[0];
106     new BusinessService().test(className);
107 
108     sessionFactory.close();
109   }
110 }

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6 
 7   <class name="mypack.HiloTester"  table="HILO_TESTER">
 8     
 9     <id name="id" type="long" column="ID">
10     <generator class="hilo">
11                 <param name="table">hi_value</param>
12                 <param name="column">next_value</param>
13                 <param name="max_lo">100</param>
14         </generator>
15     </id>
16 
17     <property name="name" type="string" column="NAME" />
18      
19   </class>
20  
21 </hibernate-mapping>

 1 package mypack;
 2 public class HiloTester  {
 3     private Long id;
 4     private String name;
 5 
 6     public HiloTester() {
 7     }
 8 
 9     public HiloTester(String name) {
10        this.name = name;
11     }
12    
13     public Long getId() {
14         return this.id;
15     }
16     
17     public void setId(Long id) {
18         this.id = id;
19     }
20     public String getName() {
21         return this.name;
22     }
23     
24     public void setName(String name) {
25         this.name = name;
26     }
27 
28 
29 
30 
31 }

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6 
 7   <class name="mypack.IdentityTester"  table="IDENTITY_TESTER">
 8     
 9     <id name="id" type="long" column="ID">
10       <generator class="identity"/>
11     </id>
12 
13     <property name="name" type="string" column="NAME" />
14      
15   </class>
16  
17 </hibernate-mapping>

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6 
 7   <class name="mypack.IncrementTester" table="INCREMENT_TESTER" >
 8     
 9     <id name="id" type="long" column="ID">
10       <meta attribute="scope-set">private</meta>
11       <generator class="increment"/>
12     </id>
13 
14     <property name="name" type="string" column="NAME" />
15      
16   </class>
17  
18 </hibernate-mapping>

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6 
 7   <class name="mypack.NativeTester" table="NATIVE_TESTER" >
 8     
 9     <id name="id" type="long" column="ID">
10       <generator class="native"/>
11     </id>
12 
13     <property name="name" type="string" column="NAME" />
14      
15   </class>
16  
17 </hibernate-mapping>

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <!DOCTYPE hibernate-configuration
 3  PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
 4  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6     <session-factory>
 7         <property name="dialect">
 8             org.hibernate.dialect.MySQLDialect
 9         </property>
10         <property name="connection.driver_class">
11             com.mysql.jdbc.Driver
12         </property>
13         <property name="connection.url">
14             jdbc:mysql://localhost:3306/sampledb
15         </property>
16         <property name="connection.username">root</property>
17         <property name="connection.password">1234</property>
18         <property name="show_sql">true</property>
19         <mapping resource="mypack/HiloTester.hbm.xml" />
20         <mapping resource="mypack/IdentityTester.hbm.xml" />
21         <mapping resource="mypack/IncrementTester.hbm.xml" />
22         <mapping resource="mypack/NativeTester.hbm.xml" />
23     </session-factory>
24 </hibernate-configuration>

 1 use sampledb;
 2 
 3 drop table if exists HILO_TESTER;
 4 drop table if exists IDENTITY_TESTER;
 5 drop table if exists INCREMENT_TESTER;
 6 drop table if exists NATIVE_TESTER;
 7 drop table if exists hi_value;
 8 create table HILO_TESTER (ID bigint not null, name varchar(15), primary key (ID));
 9 create table IDENTITY_TESTER (ID bigint not null auto_increment, name varchar(15), primary key (ID));
10 create table INCREMENT_TESTER (ID bigint not null, NAME varchar(15), primary key (ID));
11 create table NATIVE_TESTER (ID bigint not null auto_increment, name varchar(15), primary key (ID));
12 create table hi_value ( next_value integer );
13 insert into hi_value values ( 0 );

 1 <?xml version="1.0"?>
 2 <project name="Learning Hibernate" default="prepare" basedir=".">
 3 
 4   <!-- Set up properties containing important project directories -->
 5   <property name="source.root" value="src"/>
 6   <property name="class.root" value="classes"/>
 7   <property name="lib.dir" value="lib"/>
 8   <property name="schema.dir" value="schema"/>
 9 
10   <!-- Set up the class path for compilation and execution -->
11   <path id="project.class.path">
12       <!-- Include our own classes, of course -->
13       <pathelement location="${class.root}" />
14       <!-- Include jars in the project library directory -->
15       <fileset dir="${lib.dir}">
16         <include name="*.jar"/>
17       </fileset>
18   </path>
19 
20 
21   <!-- Create our runtime subdirectories and copy resources into them -->
22   <target name="prepare" description="Sets up build structures">
23     <delete dir="${class.root}"/>
24     <mkdir dir="${class.root}"/>
25 
26     <!-- Copy our property files and O/R mappings for use at runtime -->
27     <copy todir="${class.root}" >
28       <fileset dir="${source.root}" >
29         <include name="**/*.properties"/>
30         <include name="**/*.hbm.xml"/>
31         <include name="**/*.cfg.xml"/>
32       </fileset>
33     </copy>
34   </target>
35 
36 
37  <!-- Compile the java source of the project -->
38   <target name="compile" depends="prepare"
39           description="Compiles all Java classes">
40     <javac srcdir="${source.root}"
41            destdir="${class.root}"
42            debug="on"
43            optimize="off"
44            deprecation="on">
45       <classpath refid="project.class.path"/>
46     </javac>
47   </target> 
48 
49 
50   <target name="run_increment" description="Run a Hibernate sample"
51           depends="compile">
52    <java classname="mypack.BusinessService" fork="true">
53       <arg value="mypack.IncrementTester" />
54       <classpath refid="project.class.path"/>
55    </java>
56   </target>
57 
58   <target name="run_identity" description="Run a Hibernate sample"
59           depends="compile">
60    <java classname="mypack.BusinessService" fork="true">
61       <arg value="mypack.IdentityTester" />
62       <classpath refid="project.class.path"/>
63    </java>
64   </target>
65 
66 
67   <target name="run_hilo" description="Run a Hibernate sample"
68           depends="compile">
69    <java classname="mypack.BusinessService" fork="true">
70       <arg value="mypack.HiloTester" />
71       <classpath refid="project.class.path"/>
72    </java>
73   </target>
74 
75   <target name="run_native" description="Run a Hibernate sample"
76           depends="compile">
77    <java classname="mypack.BusinessService" fork="true">
78       <arg value="mypack.NativeTester" />
79       <classpath refid="project.class.path"/>
80    </java>
81   </target>
82 
83 </project>