小海贼的夜晚

这是一个简单的例子

1. 在mySQL中建立一张USER表。

CREATE TABLE USER (
    user_id CHAR(32) NOT NULL PRIMARY KEY,
    name VARCHAR(16) NOT NULL,
    sex CHAR(1),
    age INT
);

2. 建立一个pojo

package com.xy;

public class User {
    private String id;
    private String name;
    private char sex;
    private int age;

    public int getAge() {
        return age;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public char getSex() {
        return sex;
    }

    public void setAge(int i) {
        age = i;
    }

    public void setId(String string) {
        id = string;
    }

    public void setName(String string) {
        name = string;
    }

    public void setSex(char c) {
        sex = c;
    }
}

3. hibernate.cfg.xml文件

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- 显示实际操作数据库时的SQL -->
        <property name="show_sql">true</property>
        <!-- SQL方言，这里设定的是MySQL -->
        <property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>
        <!-- JDBC驱动程式 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- JDBC URL -->
        <property name="connection.url">jdbc:mysql://localhost/jiejie</property>
        <!-- 用户名 -->
        <property name="connection.username">root</property>
        <!-- 密码-->
        <property name="connection.password"></property>

        <!-- 映射文件 -->
        <mapping resource="User.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

4. User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping
    PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>

    <class name="com.xy.User" table="USER">

        <id name="id" type="string" unsaved-value="null">
            <column name="user_id" sql-type="char(32)" />
            <generator class="uuid.hex"/>
        </id>

        <property name="name" type="string" not-null="true">
            <column name="name" length="16" not-null="true"/>
        </property>

        <property name="sex" type="char"/>

        <property name="age" type="int"/>

    </class>

</hibernate-mapping>

5. 测试文件

package com.xy;

import java.util.List;
import java.util.ListIterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;

public class HibernateTest {
 private static Log log = LogFactory.getLog(HibernateTest.class);
 public void find() {
  SessionFactory sessionFactory;
  try {
   sessionFactory = new Configuration().configure()
     .buildSessionFactory();

   Session session = sessionFactory.openSession();

   List users = session.find("from User");

   session.close();
   sessionFactory.close();

   for (ListIterator iterator = users.listIterator(); iterator
     .hasNext();) {
    User user = (User) iterator.next();
    System.out.println(user.getName() + "\n\tAge: " + user.getAge()
      + "\n\tSex: " + user.getSex());
   }
  } catch (HibernateException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

 public void insert() {

  SessionFactory sessionFactory;
  try {
   sessionFactory = new Configuration().configure()
     .buildSessionFactory();

   User user = new User();
   user.setName("caterpillar");
   user.setSex('M');
   user.setAge(23);

   Session session = sessionFactory.openSession();
   Transaction tx = session.beginTransaction();
   session.save(user);
   tx.commit();
   session.close();
   sessionFactory.close();

   System.out.println("插入数据OK!请在MySQL查看结果！");
  } catch (HibernateException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

 public static void main(String[] args) throws HibernateException {

  new HibernateTest().find();
  new HibernateTest().insert();

 }
}

6. 文件结构和所用到的jar包


 
7. 操作结果

log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select user0_.user_id as user_id, user0_.name as name, user0_.sex as sex, user0_.age as age from USER user0_
caterpillar
 Age: 28
 Sex: M
caterpillar
 Age: 28
 Sex: M
caterpillar
 Age: 28
 Sex: M
caterpillar
 Age: 23
 Sex: M
qqqqq
 Age: 20
 Sex: M
www
 Age: 21
 Sex: M
yyy
 Age: 20
 Sex: M
yyy
 Age: 20
 Sex: M
yyy
 Age: 20
 Sex: M
yyy
 Age: 20
 Sex: M
Hibernate: insert into USER (name, sex, age, user_id) values (?, ?, ?, ?)
插入数据OK!请在MySQL查看结果！