关于Hibernate一点体会

最新推荐文章于 2025-07-28 23:27:29 发布

转载最新推荐文章于 2025-07-28 23:27:29 发布 · 924 阅读

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#hibernate #manager #session #character #class #string

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作者近期深入研究Hibernate，记录了其数据库的简单操作。包括创建数据库表、编写map文件，还给出插入、更新和删除数据的代码示例，同时提到这些只是简单操作，批量处理应有更好实现方法。

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来源： http://blog.youkuaiyun.com/nihilism/

最近开始狂看Hibernate，发觉很有看头，要彻底了解其运作还是需要一定时日。
记录最简单的操作吧
数据库
CREATE TABLE manager (
    id integer primary key DEFAULT nextval('serial'::text) NOT NULL,
    name character varying(20) NOT NULL,
    "password" character varying(20)
);
map文件
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

<hibernate-mapping>
    <class name="Manager" table="manager">

        <id name="id" type="java.lang.Integer" column="id">
            <generator class="sequence">
                <param name="sequence">manager_id_serial</param>
            </generator>
        </id>

        <property
            name="name"
            type="java.lang.String"
            column="name"
            length="20"
        >
            <meta attribute="scope-get">private</meta>
            <meta attribute="scope-set">private</meta>
            <meta attribute="beans-property-type">constrained</meta>
        </property>
        <property
            name="password"
            type="java.lang.String"
            column="password"
            length="20"
        />
    </class>
</hibernate-mapping>

插入数据

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

public class InsertData {

    public static void main(String[] args) {
        try {
            SessionFactory sf =
                new Configuration().configure().buildSessionFactory();
            Session session = sf.openSession();
            Transaction tx = session.beginTransaction();

            for (int i = 1; i < 10; i++) {
                Manager m = new Manager();
                m.setName("Name" + i);
                m.setPassword("Password");
                session.save(m);
            }

tx.commit();
session.close();

        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }
}

更新数据
public class UpdateData {
/*
delete data
*/
    public static void main(String[] args) {
   try {
            SessionFactory sf =
                new Configuration().configure().buildSessionFactory();
            Session session = sf.openSession();
            Transaction tx = session.beginTransaction();
   //String m = "Name0";
   Manager m1 = new Manager();
   m1.setId(1);
   m1.setName("lanhuizi");
   m1.setPassword("Nothing");
   session.update(m1);

tx.commit();
session.close();

        } catch (HibernateException e) {
            System.out.println("error");
        }

    }

}

删除数据
public class DeleteData {
/*
delete data
*/
    public static void main(String[] args) {
   try {
            SessionFactory sf =
                new Configuration().configure().buildSessionFactory();
            Session session = sf.openSession();
            Transaction tx = session.beginTransaction();
   //String m = "Name0";
   Manager m1 = new Manager();
   m1.setId(1);
   session.delete(m1);