hibernate 基本和简单易用

首先hibernate.cfg.xml构造，在该文件src文件夹

<!DOCTYPE hibernate-configuration PUBLIC  

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

            "http://hibernate.sourceforge.net/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://192.168.1.81:3306/test</property>

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

        <property name="connection.password">123456</property>



        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size">1</property>



        <!-- SQL dialect -->

        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>



        <!-- Enable Hibernate's automatic session conttext management -->

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



        <!-- Disable the second-level cache -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>



        <!-- Echo all executed SQL to show -->

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



        <!-- Format SQL -->

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



        <!-- Drop and re-create the database schema on startup -->

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



        <mapping resource="com/bjsxt/hibernate/Student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

Student.java 文件

package com.bjsxt.hibernate;



public class Student {

    private String uname;

    private int age;

    private String sex;



    public String getUname() {

        return uname;

    }



    public void setUname(String uname) {

        this.uname = uname;

    }



    public int getAge() {

        return age;

    }



    public void setAge(int age) {

        this.age = age;

    }



    public String getSex() {

        return sex;

    }



    public void setSex(String sex) {

        this.sex = sex;

    }



}

Student.hbm.xml的配置

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

    <hibernate-mapping>  

        <class name="com.bjsxt.hibernate.Student" table="userinfo">  

            <id name="uname"></id>  

            <property name="age"/>  

            <property name="sex"/>  

        </class>  

    </hibernate-mapping>

測试的Test文件

package com.bjsxt.hibernate;



import java.util.List;



import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;



public class Test {

    public static void main(String args[]) {

        query();

    }



    // 插入数据

    public static void insert() {

        Student s = new Student();

        s.setUname("xiaoming");

        s.setSex("女");

        s.setAge(13);

        SessionFactory sessionFactory = new AnnotationConfiguration()

                .configure().buildSessionFactory();

        Session session = sessionFactory.getCurrentSession();

        session.beginTransaction();

        session.save(s);

        session.getTransaction().commit();



    }



    // 删除数据

    public static void delete() {

        Student s = new Student();

        s.setUname("xiaoming");

        SessionFactory sessionFactory = new AnnotationConfiguration()

                .configure().buildSessionFactory();

        Session session = sessionFactory.getCurrentSession();

        session.beginTransaction();

        session.delete(s);

        ;

        session.getTransaction().commit();



    }



    // 改动数据

    public static void updata() {

        SessionFactory sessionFactory = new AnnotationConfiguration()

                .configure().buildSessionFactory();

        Session session = sessionFactory.getCurrentSession();

        session.beginTransaction();

        Student s = (Student) session.get(Student.class, "xiaoming");

        if (s != null) {

            s.setSex("女");

            s.setAge(100);

            session.update(s);

            ;

            session.getTransaction().commit();

        }

    }



    // 查询数据

    public static void query() {

        SessionFactory sessionFactory = new AnnotationConfiguration()

                .configure().buildSessionFactory();

        Session session = sessionFactory.getCurrentSession();

        session.beginTransaction();

        Query query = session

                .createQuery("from Student where uname='小明' ");

        List<Student> list = query.list();

        for(Student s:list){

            System.out.println(s.getAge()+"\n");

        }

    }



}

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