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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