Hibernate入门

okay，了解了struts2后开始搭建hibernate环境

eclipse 4.3.2

jdk 1.7.0_45

hibernate 4.3.5

mysql 5.1.67

准备好上面的环境，安装hibernate（拷贝hibernate所需lib-->requered-->jar包和mysql的java驱动jar包拷到lib里面）

在数据库新建一个数据库hibernate,创建usertable表字段有name,password

在eclipse中新建一个java project Hiernate

在src目录下新建一个hibernate.cfg.xml文件（可以在文档里面找到基本的配置，然后根据自己的情况修改一下）

<?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/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password"></property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

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

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="com/gxf/beans/user.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

在src目录下新建一个bean，User.java

package com.gxf.beans;

public class User {
    private String name;
    private String password;
    
    public User(String name, String password) {
        super();
        
        this.name = name;
        this.password = password;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

在与bean同目录下新建一个user.hbm.xml（这里可以在文档里面找到，根据自己的bean和数据库表进行修改）

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

<hibernate-mapping package="com.gxf.beans">

    <class name="User" table="usertable">
        <id name="name"> 
        </id>
        <property name="password"/>
    </class>

</hibernate-mapping>

在src目录下新建一个测试类，Test.java

package com.gxf.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import com.gxf.beans.User;

public class Test {

    public static void main(String[] args) {
        try {
            Configuration configuration = new Configuration().configure();
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
            SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
            Session session = sessionFactory.openSession();
            
            
            Transaction tx = session.beginTransaction();
            User userToSave = new User("lisi","luckyzhangsan");
            session.save(userToSave);
            tx.commit();
            session.close();
           } catch (HibernateException e) {
            e.printStackTrace();
           }
        }

    }

最后运行Test.java，控制台没有报错，病输出对应的sql语句。到数据库中执行查找命令，插入成功

这里只是为了测试hibernate环境，熟悉hibernate的工作流程，比较粗糙