hibernate之初学项目搭建

<!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>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/webproject</property><!--
                反正下面这段话我直接跑去hibernate.dialect包下复制文件路径的时候gg了要指定特定的方言
        --><property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="hibernate.show_sql">true</property><!--
                如果不加下面这句话，引入你自己写的配置文件，你将会很绝望
        --><mapping resource="com/xinzhi/dao/UserEntity.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

<?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.xinzhi.dao">
    
    <class name="UserEntity"  table="user"><!--
        这里是主键，name是你实体类中的主键名称 ， column是你数据库中字段的主键
        --><id name="id" column="id">
            <generator class="native"/>
        </id><!--
        下面的分别是实体类中的属性对应数据库中的字段
        --><property name="username" column="username"></property>
        <property name="pwd" column="pwd"></property>
    </class>

</hibernate-mapping>

package com.xinzhi.dao;

public class UserEntity {
    private int id;
    private String username;
    private String pwd;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "UserEntity [id=" + id + ", pwd=" + pwd + ", username="
                + username + "]";
    }

}

package com.xinzhi.dao;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import org.junit.Test;

public class TestHibernate {
    static SessionFactory sf;
    static {
        /**
         * 通过配置组来创建session工厂,因为这个工厂一般只要创建一次
         */
        sf = new Configuration().configure().buildSessionFactory();
    }

    @Test
    public void testname() throws Exception {
        /**
         * 查询所有用户
         */
        // 开启一个会话
        Session session = sf.openSession();
        // 通过会话开启一个交易或者说一个事务
        Transaction transaction = session.beginTransaction();
        // 根据主键查询
        // UserEntity user = (UserEntity) session.get(UserEntity.class, 1);
        // 获取一个查询集
        Query q = session.createQuery("from UserEntity where id=1 or id=2 ");

        List<UserEntity> list = q.list();
        System.out.println(list);
        // 提交交易/事务
        transaction.commit();
        // 关闭会话
        session.close();
    }
}