hibernate 的映射文件 配置文件 實體bean

實體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>
//這是完整的包名，如果沒有回報找不到實體bean的錯誤
 <class name="cn.toher.hibernate.model.Employee" table="EMPLOYEE"> <meta attribute="class-description"> This class contains the employee detail. </meta>
// 這里面的string的s 是小寫的，如果寫成大寫的回報錯誤
 <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>     
      <!--表明以下的配置是針對session-factory配置的，SessionFactory是Hibernate中的一個類，這個類主要負責保存HIbernate的配置信息，以及對Session的操作-->     
      <session-factory>   
          <!-- 1，數據庫連接信息： -->       
          <!--配置數據庫的驅動程序，Hibernate在連接數據庫時，需要用到數據庫的驅動程序-->     
          <property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>     
          <!--設置數據庫的連接url:jdbc:mysql://localhost：3306/dbname,其中localhost表示mysql服務器名稱，此處為本機，    dbname是數據庫名-->      
          <property name="hibernate.connection.url">jdbc:sqlserver://192.168.1.131:1433;DatabaseName=Test</property>      
          <!--連接數據庫是用戶名-->     
          <property name="hibernate.connection.username">sa</property>     
          <!--連接數據庫是密碼-->     
          <property name="hibernate.connection.password">123456a</property>   
          <!--hibernate.dialect 只是Hibernate使用的數據庫方言,就是要用Hibernate連接那種類型的數據庫服務器。-->     
          <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>   
            
          <!-- 以下信息可選 -->  
          <!--jdbc.use_scrollable_resultset是否允許Hibernate用JDBC的可滾動的結果集。對分頁的結果集。對分頁時的設置非常有幫助-->     
<!--          <property name="jdbc.use_scrollable_resultset">false </property>     
          connection.useUnicode連接數據庫時是否使用Unicode編碼     
          <property name="Connection.useUnicode">true </property>     
          connection.characterEncoding連接數據庫時數據的傳輸字符集編碼方式，     
          <property name="connection.characterEncoding">utf-8 </property>        -->
                     
<!--          2，數據庫連接池信息：    注意：現在還用不上，所以先注銷掉 
          <property name="hibernate.connection.pool.size">20 </property>     
           指定連接池的最大連接個數，使用連接池需要加載所有的鏈接池的JAR文件，JAR文件在Hibernate文件夾下的“lib\optional\c3p0”中     
           <property name="hibernate.c3p0.max_size">30</property>  
           <property name="hibernate.c3p0.min_size">10</property>   
           <property name="hibernate.c3p0.timeout">5000</property> 指定連接池里連接超時時長，即最大時間    -->
             
          <!--3，數據庫一次操作時的記錄數：：-->     
          <!--jdbc.fetch_size是指Hibernate每次從數據庫中取出並放到JDBC的Statement中的記錄條數。Fetch Size設的越大，讀數據庫的次數越少，速度越快，Fetch Size越小，讀數據庫的次數越多，速度越慢-->     
<!--          <property name="jdbc.fetch_size">50 </property>     
          jdbc.batch_size是指Hibernate批量插入,刪除和更新時每次操作的記錄數。Batch Size越大，批量操作的向數據庫發送Sql的次數越少，速度就越快，同樣耗用內存就越大     
          <property name="jdbc.batch_size">23 </property>     -->
            
             
          <!--4，是否顯示sql：-->            
          <!--是否在后台顯示Hibernate用到的SQL語句，開發時設置為true，便於差錯，程序運行時可以在Eclipse的控制台顯示Hibernate的執行Sql語句。項目部署后可以設置為false，提高運行效率-->     
          <property name="hibernate.show_sql">true </property>   
  
            
            
          <!--  
           create: 先刪表，再建表。  
           create-drop: 啟動時建表，退出前刪表。  
           update: 如果表結構不一致，就創建或更新。  
           validate: 啟動時驗證表結構，如果不致就拋異常。  
          -->  
          <property name="hibernate.hbm2ddl.auto">update</property> 
            
          <!-- 5,開啟二級緩存使用： 4.X二級緩存里面缺少很多包，所以先別用-->   
<!--          <property name="hibernate.cache.use_second_level_cache">true</property>  
          <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> 指定緩存產品所需的類   
          <property name="hibernate.cache.use_query_cache">true</property> 啟用查詢緩存   -->
            
                         
           <!--6，指定映射文件，可映射多個映射文件,映射的就是實體類,這是基於XML映射文件的-->            
          <!--<mapping resource="cn/toher/hibernate/model/Student.hbm.xml" />-->     
          <!--這是基於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>