hibernate的Anotation的应用

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A friend is never known till a man has need.需要之时方知友

主要以代码为主，首先来看看代码的目录结构，主要的是采用黄色标识出的，没有标识的与Student有关的，都是和现在所说的Anotation无关

Teacher的model原型，注意里面的Anotation标识

Java代码

package com.bjsxt.hibernate.model;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Teacher {
private int id;
private String name;
private String title;
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}

package com.bjsxt.hibernate.model;import javax.persistence.Entity;import javax.persistence.Id;@Entitypublic class Teacher {private int id;private String name;private String title;@Idpublic int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}}

hibernate.cfg.xml的配置

Java代码

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">mlc</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<mapping class="com.bjsxt.hibernate.model.Teacher"/>
</session-factory>

<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-configuration PUBLIC        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory>        <!-- Database connection settings -->        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>        <property name="connection.username">root</property>        <property name="connection.password">mlc</property>        <!-- JDBC connection pool (use the built-in) -->       <!--   <property name="connection.pool_size">1</property>  -->        <!-- SQL dialect -->        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>        <!-- Enable Hibernate's automatic session context management -->        <!--  <property name="current_session_context_class">thread</property> -->        <!-- Disable the second-level cache  -->        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>        <!-- Echo all executed SQL to stdout -->        <property name="show_sql">true</property>        <!-- Drop and re-create the database schema on startup -->        <!--  <property name="hbm2ddl.auto">update</property> -->        <mapping class="com.bjsxt.hibernate.model.Teacher"/>    </session-factory>

代码测试类

Java代码

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import com.bjsxt.hibernate.model.Student;
import com.bjsxt.hibernate.model.Teacher;
public class TeacherTest {
/**
* @param args
*/
public staticvoid main(String[] args) {
// TODO Auto-generated method stub
Teacher tea= new Teacher();
tea.setTitle("mlc");
tea.setId(2);
tea.setName("mlc");
Configuration cf = new AnnotationConfiguration();
SessionFactory sf = cf.configure().buildSessionFactory();
Session session =sf.openSession();
session.beginTransaction();
session.save(tea);
session.getTransaction().commit();
session.close();
sf.close();
}
}

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.AnnotationConfiguration;import org.hibernate.cfg.Configuration;import com.bjsxt.hibernate.model.Student;import com.bjsxt.hibernate.model.Teacher;public class TeacherTest {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubTeacher tea= new Teacher();tea.setTitle("mlc");tea.setId(2);tea.setName("mlc");Configuration cf = new  AnnotationConfiguration();SessionFactory sf = cf.configure().buildSessionFactory();Session session =sf.openSession();session.beginTransaction();session.save(tea);session.getTransaction().commit();session.close();sf.close();}}

很明显采用了Anotation之后，hibernate的应用变得更为简介，具体问题可以针对性的讨论