Hibernate框架简介

<?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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
    <property name="connection.username">root</property>
    <property name="connection.url">//地址，木有写账号密码...
        jdbc:mysql://localhost:3306/study
    </property>
    <property name="dialect">//方言
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="myeclipse.connection.profile">MySQL5.0</property>
    <property name="connection.password">root</property>
    <property name="connection.driver_class">//驱动
        org.gjt.mm.mysql.Driver
    </property>
    <property name="show_sql">true</property>
    <mapping resource="hibernate/PO/TRegister.hbm.xml" />

</session-factory>

</hibernate-configuration>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
    <class name="hibernate.PO.TRegister" table="t_register">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <!-- 我在MYSQL中并没有设置该字段递增，但在Hibernate中依然可以设置为递增 -->
            <generator class="increment" />
        </id>
        <property name="userName" type="java.lang.String">
            <column name="userName" length="30" />
        </property>
        <property name="userPwd" type="java.lang.String">
            <column name="userPwd" length="30" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="sex" length="10" />
        </property>
        <property name="age" type="java.lang.Integer">
            <column name="age" />
        </property>
    </class>
</hibernate-mapping>

create table T_register
(
    id    int primary key,
    userName varchar(30),
    userPwd varchar(30),
    sex varchar(10),
    age int
)

/**
 * 持久化类
 */

public class TRegister  implements java.io.Serializable {


    // Fields    

     private Integer id;
     private String userName;
     private String userPwd;
     private String sex;
     private Integer age;


    // Constructors

    /** default constructor */
    public TRegister() {
    }

    /** minimal constructor */
    public TRegister(Integer id) {
        this.id = id;
    }
    
    /** full constructor */
    public TRegister(Integer id, String userName, String userPwd, String sex, Integer age) {
        this.id = id;
        this.userName = userName;
        this.userPwd = userPwd;
        this.sex = sex;
        this.age = age;
    }

   
    // Property accessors

    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return this.userName;
    }
    
    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPwd() {
        return this.userPwd;
    }
    
    public void setUserPwd(String userPwd) {
        this.userPwd = userPwd;
    }

    public String getSex() {
        return this.sex;
    }
    
    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return this.age;
    }
    
    public void setAge(Integer age) {
        this.age = age;
    }
}

**
 * hibernate 基础类
 * @author fengyan
 * date 2007-01-09 02:32
 */
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
    
    private static final SessionFactory sessionFactory;
    
    static
    {
        try
        {
            //流程图中第一步，解析配置文件
            Configuration config = new Configuration().configure("/hibernate/hibernate.cfg.xml");
           //解析Mapping映射文件，生成工厂
            sessionFactory = config.buildSessionFactory();
        }
        catch(Throwable e)
        {
            throw new ExceptionInInitializerError(e);
        }
    }
    
    public static final ThreadLocal session = new ThreadLocal();
    
    public static Session currentSession() throws HibernateException
    {
        Session s = (Session)session.get();
        //Open a new Session,if this Thread has none yet
        if(s == null || !s.isOpen())
        {
            //得到session
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }
    
    public static void closeSession() throws HibernateException
    {
        Session s = (Session)session.get();
        session.set(null);
        if(s != null)
            s.close();
    }

}