hibernate 的映射文件 配置文件 实体bean

实体bean，文件名字：Employee.java

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package cn.toher.hibernate.model;

import javax.persistence.Entity;
import javax.persistence.Id;

/**
 *
 * @author Administrator
 */
@Entity
public class Employee {
    private String id;
    private String firstName; 
    private String lastName;   
    private int salary;  

    public Employee() {}
    public Employee(String fname, String lname, int salary) {
        this.firstName = fname;
        this.lastName = lname;
        this.salary = salary;
    }
    @Id
    public String getId() {
        return id;
    }
    public void setId( String id ) {
        this.id = id;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName( String first_name ) {
        this.firstName = first_name;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName( String last_name ) {
        this.lastName = last_name;
    }
    public int getSalary() {
        return salary;
    }
    public void setSalary( int salary ) {
        this.salary = salary;
    }
}

映射文件  文件名字：Employee.hbm.xm<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC 

 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping>
//这是完整的包名，如果没有回报找不到实体bean的错误

   <class name="cn.toher.hibernate.model.Employee" table="EMPLOYEE">
      <meta attribute="class-description">
         This class contains the employee detail. 
      </meta>
// 这里面的string的s 是小写的，如果写成大写的回报错误

      <id name="id" type="string" column="id">

//id生成策略

         <generator class="uuid"/>
      </id>
      <property name="firstName" column="first_name" type="string"/>
      <property name="lastName" column="last_name" type="string"/>
      <property name="salary" column="salary" type="int"/>
   </class>
</hibernate-mapping>

配置文件 文件名字：hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
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<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>     
      <!--表明以下的配置是针对session-factory配置的，SessionFactory是Hibernate中的一个类，这个类主要负责保存HIbernate的配置信息，以及对Session的操作-->     
      <session-factory>   
          <!-- 1，数据库连接信息： -->       
          <!--配置数据库的驱动程序，Hibernate在连接数据库时，需要用到数据库的驱动程序-->     
          <property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>     
          <!--设置数据库的连接url:jdbc:mysql://localhost：3306/dbname,其中localhost表示mysql服务器名称，此处为本机，    dbname是数据库名-->      
          <property name="hibernate.connection.url">jdbc:sqlserver://192.168.1.131:1433;DatabaseName=Test</property>      
          <!--连接数据库是用户名-->     
          <property name="hibernate.connection.username">sa</property>     
          <!--连接数据库是密码-->     
          <property name="hibernate.connection.password">123456a</property>   
          <!--hibernate.dialect 只是Hibernate使用的数据库方言,就是要用Hibernate连接那种类型的数据库服务器。-->     
          <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>   
            
          <!-- 以下信息可选 -->  
          <!--jdbc.use_scrollable_resultset是否允许Hibernate用JDBC的可滚动的结果集。对分页的结果集。对分页时的设置非常有帮助-->     
<!--          <property name="jdbc.use_scrollable_resultset">false </property>     
          connection.useUnicode连接数据库时是否使用Unicode编码     
          <property name="Connection.useUnicode">true </property>     
          connection.characterEncoding连接数据库时数据的传输字符集编码方式，     
          <property name="connection.characterEncoding">utf-8 </property>        -->
                     
<!--          2，数据库连接池信息：    注意：现在还用不上，所以先注销掉 
          <property name="hibernate.connection.pool.size">20 </property>     
           指定连接池的最大连接个数，使用连接池需要加载所有的链接池的JAR文件，JAR文件在Hibernate文件夹下的“liboptionalc3p0”中     
           <property name="hibernate.c3p0.max_size">30</property>  
           <property name="hibernate.c3p0.min_size">10</property>   
           <property name="hibernate.c3p0.timeout">5000</property> 指定连接池里连接超时时长，即最大时间    -->
             
          <!--3，数据库一次操作时的记录数：：-->     
          <!--jdbc.fetch_size是指Hibernate每次从数据库中取出并放到JDBC的Statement中的记录条数。Fetch Size设的越大，读数据库的次数越少，速度越快，Fetch Size越小，读数据库的次数越多，速度越慢-->     
<!--          <property name="jdbc.fetch_size">50 </property>     
          jdbc.batch_size是指Hibernate批量插入,删除和更新时每次操作的记录数。Batch Size越大，批量操作的向数据库发送Sql的次数越少，速度就越快，同样耗用内存就越大     
          <property name="jdbc.batch_size">23 </property>     -->
            
             
          <!--4，是否显示sql：-->            
          <!--是否在后台显示Hibernate用到的SQL语句，开发时设置为true，便于差错，程序运行时可以在Eclipse的控制台显示Hibernate的执行Sql语句。项目部署后可以设置为false，提高运行效率-->     
          <property name="hibernate.show_sql">true </property>   
  
            
            
          <!--  
           create: 先删表，再建表。  
           create-drop: 启动时建表，退出前删表。  
           update: 如果表结构不一致，就创建或更新。  
           validate: 启动时验证表结构，如果不致就抛异常。  
          -->  
          <property name="hibernate.hbm2ddl.auto">update</property> 
            
          <!-- 5,开启二级缓存使用： 4.X二级缓存里面缺少很多包，所以先别用-->   
<!--          <property name="hibernate.cache.use_second_level_cache">true</property>  
          <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> 指定缓存产品所需的类   
          <property name="hibernate.cache.use_query_cache">true</property> 启用查询缓存   -->
            
                         
           <!--6，指定映射文件，可映射多个映射文件,映射的就是实体类,这是基于XML映射文件的-->            
          <!--<mapping resource="cn/toher/hibernate/model/Student.hbm.xml" />-->     
          <!--这是基于Annotation注解的-->
        <mapping resource="cn/toher/hibernate/model/Employee.hbm.xml" />
          <!--<mapping class="cn.toher.hibernate.model.Employee" />-->     
<!--          <mapping class="cn.toher.hibernate.model.OutboundLog" />     
          <mapping class="cn.toher.hibernate.model.AfterSaleLog" />     -->
  </session-factory>     
  </hibernate-configuration>