Struts+Hibernate系列教材 （二）- hiberante 部分

步骤1:Hibernate准备工作
步骤2:创建数据库how2java
步骤3:pojo
步骤4:Product.hbm.xml
步骤5:hibernate.cfg.xml
步骤6:dao

步骤 1 : Hibernate准备工作

这部分准备Hibernate方面的事情

步骤 2 : 创建数据库how2java

create database  how2java

步骤 3 : pojo

Product有id,name,price3个字段

package com.how2java.pojo;

public class Product {

    private int id;

    private String name;

    private float price;

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public float getPrice() {

        return price;

    }

    public void setPrice(float price) {

        this.price = price;

    }

     

}

步骤 4 : Product.hbm.xml

映射Product类对应product_表

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.how2java.pojo">

    <class name="Product" table="product_">

        <id name="id" column="id">

            <generator class="native">

            </generator>

        </id>

        <property name="name" />

        <property name="price" />

    </class>

     

</hibernate-mapping>

步骤 5 : hibernate.cfg.xml

hibernate基本配置，指定数据库，账号，密码，方言等等

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

       "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost:3306/how2java?characterEncoding=GBK</property>

        <property name="connection.username">root</property>

        <property name="connection.password">admin</property>

        <!-- SQL dialect -->

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <property name="current_session_context_class">thread</property>

        <property name="show_sql">true</property>

        <property name="hbm2ddl.auto">update</property>

        <mapping resource="com/how2java/pojo/Product.hbm.xml" />

         

    </session-factory>

</hibernate-configuration>

步骤 6 : dao

为ProductDAO准备增，删，修改，查询，获取方法

package com.how2java.dao;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import com.how2java.pojo.Product;

public class ProductDAO {

    public void add(Product p) {

        List<Product> result = new ArrayList();

        SessionFactory sf = new Configuration().configure()

                .buildSessionFactory();

        Session s = sf.openSession();

        s.beginTransaction();

        s.save(p);

        s.getTransaction().commit();

        s.close();

        sf.close();

    }

    public Product get(int id) {

        Product result = null;

        SessionFactory sf = new Configuration().configure()

                .buildSessionFactory();

        Session s = sf.openSession();

        result = (Product) s.get(Product.class, id);

        s.close();

        sf.close();

        return result;

    }

    public void delete(int id) {

        List<Product> result = new ArrayList();

        SessionFactory sf = new Configuration().configure()

                .buildSessionFactory();

        Session s = sf.openSession();

        s.beginTransaction();

        Product p = (Product) s.get(Product.class, id);

        s.delete(p);

        s.getTransaction().commit();

        s.close();

        sf.close();

    }

    public void update(Product p) {

        List<Product> result = new ArrayList();

        SessionFactory sf = new Configuration().configure()

                .buildSessionFactory();

        Session s = sf.openSession();

        s.beginTransaction();

        s.update(p);

        s.getTransaction().commit();

        s.close();

        sf.close();

    }

    public List<Product> listProduct() {

        List<Product> result = new ArrayList();

        SessionFactory sf = new Configuration().configure()

                .buildSessionFactory();

        Session s = sf.openSession();

        Query q = s.createQuery("from Product p");

        result = q.list();

        s.close();

        sf.close();

        return result;

    }

}

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