在進(jìn)行這個(gè)實(shí)例之前，先說(shuō)之前出現(xiàn)的問(wèn)題：

1、類(lèi)前面一定要避免有空格，在這之前，從未想過(guò)類(lèi)名前面有空格還能創(chuàng)建文件；在配置的時(shí)候，會(huì)出現(xiàn)如果沒(méi)有空格，就無(wú)法找到映射類(lèi)。當(dāng)然，加了空格就可以，但請(qǐng)避免使用。

2、在配置過(guò)程中，請(qǐng)一定要根據(jù)需要?jiǎng)?chuàng)建數(shù)據(jù)庫(kù)表，并且這個(gè)表的主鍵是否考慮整型，默認(rèn)值，是否自增等。

3、運(yùn)行過(guò)程中報(bào)錯(cuò)，優(yōu)先看控制臺(tái)，判斷出錯(cuò)問(wèn)題，快速定位；如無(wú)法找到，再運(yùn)用其他技巧。

下面：先將之前幾個(gè)實(shí)例用到的數(shù)據(jù)庫(kù)表及本次使用的表貼出來(lái)：

表1：

CREATE TABLE `customers` (
  `customerID` varchar(8) NOT NULL,
  `name` varchar(15) DEFAULT NULL,
  `phone` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`customerID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

表2：

CREATE TABLE `customers2` (
  `customerID` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(15) DEFAULT NULL,
  `phone` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`customerID`)
) ENGINE=InnoDB AUTO_INCREMENT=1015 DEFAULT CHARSET=utf8;

?

表3：

CREATE TABLE `customers3` (
  `customerID` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(15) DEFAULT NULL,
  `phone` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`customerID`)
) ENGINE=InnoDB AUTO_INCREMENT=1015 DEFAULT CHARSET=utf8;

?

表4：（略，Oracle數(shù)據(jù)庫(kù)測(cè)試）

表5：

CREATE TABLE `customers5` (
  `customerID` varchar(50) NOT NULL,
  `name` varchar(15) DEFAULT NULL,
  `phone` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`customerID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

表5示例 uuid.hex生成方式【依據(jù)機(jī)器標(biāo)識(shí)等自生】

一、Customer.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www./dtd/hibernate-mapping-3.0.dtd">


<hibernate-mapping package="bean" auto-import="false">
   <!-- POJO類(lèi)映射表及某表的關(guān)系-->
   <class name="bean.Customer5" table="customers5" catalog="test">
       <id name="customerID" type="java.lang.String">
           <column name="customerID"/>
           <generator class="uuid.hex"></generator>
       </id>
       <!-- 映射表中name字段 -->
       <property name="name" type="java.lang.String">
          <column name="name" length="40"/>
       </property>
       <!-- 映射表中phone字段 -->
       <property name="phone" type="java.lang.String">
          <column name="phone" length="16"/>
       </property>  
   </class>
</hibernate-mapping>

二、hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www./dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<!-- 配置文件標(biāo)簽順序property*,mapping*,(class-cache|collection-cache),event,listener* -->
    <session-factory>
      <!-- 設(shè)置訪問(wèn)mysql數(shù)據(jù)庫(kù)的驅(qū)動(dòng)描述 -->
      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
      <!-- 設(shè)置數(shù)據(jù)庫(kù)的url -->
      <property name="connection.url">jdbc:mysql://127.0.0.1:3306/test</property>
      <!-- 指定登錄數(shù)據(jù)庫(kù)用戶賬戶 -->
      <property name="connection.username">root</property>
      <!-- 指定登錄數(shù)據(jù)庫(kù)用戶密碼 -->
      <property name="connection.password">123456</property>
      
      <!-- 設(shè)置訪問(wèn)數(shù)據(jù)庫(kù)的方言，提高數(shù)據(jù)庫(kù)訪問(wèn)性能 -->
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
      <!-- 設(shè)置ddl -->
      <!-- <property name="hbm2ddl.auto">auto</property> -->
       <!-- 配置控制臺(tái)視圖，顯示查詢(xún)內(nèi)容 -->
       <property name="show_sql">true</property>
       <!-- 下面是多表映射 -->
      <!-- 指出映射文件 -->
      <mapping resource="resource/Customer.hbm.xml"/>
      <!-- 映射文件 -->
      <mapping resource="resource/Customer2.hbm.xml"/>
      <!-- 映射文件 -->
      <mapping resource="resource/Customer3.hbm.xml"/>
      <!-- 映射文件 -->
      <mapping resource="resource/Customer5.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

三、Customer5.java

package bean;

//驗(yàn)證uuid.hex生成主鍵方式的映射類(lèi)，數(shù)據(jù)庫(kù)對(duì)應(yīng)表customers2
public class Customer5 {
    private String customerID;
    private String name,phone;
    
    public String  getCustomerID() {
        return customerID;
    }

    public void setCustomerID(String  customerID) {
        this.customerID = customerID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

四、HibernateSessionFactory.java

package hibernate.factory;


import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;


public class HibernateSessionFactory {
    private static String configfile = "resource/hibernate.cfg.xml";
    /**ThreadLocal是一個(gè)本地線程**/
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private static Configuration config;
    private static SessionFactory sessionFactory;
    /**讀取配置文件，創(chuàng)建一個(gè)工廠會(huì)話，這段代碼為靜態(tài)塊，編譯后已經(jīng)運(yùn)行**/
    static{
        try {
            config = new Configuration().configure(configfile);
            sessionFactory = config.buildSessionFactory();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    /**通過(guò)會(huì)話工廠打開(kāi)會(huì)話，就可以訪問(wèn)數(shù)據(jù)庫(kù)了**/
    public static Session getSession(){
        Session session = (Session)threadLocal.get();
        if (session==null||!session.isOpen()) {
            if (sessionFactory==null) {
                rebuildSessionFactory();
            }
            session = (sessionFactory!=null)?sessionFactory.openSession():null;
        }
        return session;
    }
    /**重新創(chuàng)建一個(gè)會(huì)話工廠**/
    public static void rebuildSessionFactory() {
        try {
            config.configure(configfile);
            sessionFactory = config.buildSessionFactory();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    /**關(guān)閉與數(shù)據(jù)庫(kù)的會(huì)話**/
    public static void closeSession() {
        Session session = (Session)threadLocal.get();
        threadLocal.set(null);
        if (session!=null) {
            session.close();
        }
    }
}

五、Customer5Demo.java

package bean;

import java.util.List;




import hibernate.factory.HibernateSessionFactory;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.query.Query;


//用于測(cè)試increment主鍵生成方式，增加記錄，不建議使用，他是實(shí)例自增，多實(shí)例訪問(wèn)時(shí)，會(huì)重復(fù)主鍵，出問(wèn)題
//由于是增加數(shù)據(jù)，所以不需要寫(xiě)Query，只需要new表，增加數(shù)據(jù)即可
public class Customer5Demo {
    Session session = HibernateSessionFactory.getSession();
    Transaction tran = session.beginTransaction();
    public static void main(String[] args) {
        
        //測(cè)試increment主鍵生成
        Customer5Demo demo = new Customer5Demo();
        Customer5 customer5 = new Customer5();
        demo.saveCustomer5IDByIdentity(customer5, "華山", "580");
        //測(cè)試查詢(xún)結(jié)果
        List list = demo.queryAllCustomer5();
        for (int i = 0; i < list.size(); i  ) {
            Customer5 customer  = (Customer5)list.get(i);
            System.out.println(customer.getCustomerID() customer.getName() customer.getPhone());
        }
        HibernateSessionFactory.closeSession();
        
    }
    
    //下面是封裝保存
    public void saveCustomer5IDByIdentity(Customer5 customer5,String name,String phone) {
        customer5.setName(name);
        customer5.setPhone(phone);
        session.save(customer5);
        //一定一定要記得提交事務(wù)
        tran.commit();
    }
    //下面是封裝查詢(xún)
    @SuppressWarnings("rawtypes")
    public List queryAllCustomer5(){
        /**由會(huì)話工廠類(lèi)創(chuàng)建一個(gè)會(huì)話Session對(duì)象**/
        Session session = HibernateSessionFactory.getSession();
        /**由會(huì)話session對(duì)象創(chuàng)建一個(gè)查詢(xún)對(duì)象**/
        Query query = session.createQuery("from bean.Customer5");
        List list = query.list();
        HibernateSessionFactory.closeSession();
        return list;
    }
}

?