Hibernate初入门1

刚开始接触hibernate，顿时对ORM(对象关系映射 Object Relational Mapping )有了几分崇拜之情，但心也是够累的！！不说太多，直接贴图！！

 

 

看到这里，内心也是崩溃的！！一万只尼玛奔过，过时的方法不能用(能力问题，没看懂异常)？！！！

通过千百次的测试，尼玛，网上的资料也太不负责了！！直接copy的hibernate.cfg.xml竟然是错的！！这尼玛<hibernate-configuration>标签也害的我挣扎了那么久！！

<?xml version='1.0' encoding='utf-8'?>
//这尼玛标签<hibernate-configuration>也没人性了
<hibernate-configuration
        xmlns="http://www.hibernate.org/xsd/hibernate-configuration"
        xsi:schemaLocation="http://www.hibernate.org/xsd/hibernate-configuration hibernate-configuration-4.0.xsd"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <session-factory>
    <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">TAN19911104</property>

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

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

    <property name="show_sql">true</property>
    
    <mapping resource="com/hibernate/Exp150702/Student.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

没办法，英语苦逼的差，看不懂官方的英文文档(其实是在官网上溜了一圈，没找到这部分文档在哪)

上点自认为正确的吧！！希望能对吾等菜鸟们有点帮助。

hibernate.cfg.xml配置文件

<?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>
    <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">TAN19911104</property>

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

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

    <property name="show_sql">true</property>
    
    <mapping resource="com/hibernate/Exp150702/Student.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

 

Student.hbm.xml映射文件

<?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.hibernate.Exp150702">
 <class name="Student">
    <id name="id"></id>
    <property name="name"></property>
    <property name="birthday"></property>
 </class>
</hibernate-mapping>

Student类

package com.hibernate.Exp150702;

import java.util.Date;

public class Student {
    
    
    private int id;
    private String name;
    private Date birthday;
    
    
    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 Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    

}

测试类

测试类中也出现了一个比较奇怪的问题！！当使用new SimpleDateFormate("YYYY-MM-DD")时，最终保存在数据库中的数据会与实际值不同。但将其中的样式“YYYY-MM-DD"

更改为”yyyy-MM-dd“时，就不会有错误的出现！！本人试过，发现确实如此！！如非如此，望告知！！

package com.hibernate.Exp150702;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

public class TestDemo {


    @SuppressWarnings("deprecation")
    @Test
    public void test() throws Exception{
        
        Student s = new Student();
        s.setId(1);
        s.setName("小元");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date date = sdf.parse("1967-11-04");
        s.setBirthday(date);
        Configuration cfg = new Configuration();
        SessionFactory sf = cfg.configure().buildSessionFactory();
        Session session = sf.openSession();
        session.beginTransaction();
        session.save(s);
        session.getTransaction().commit();
        session.close();
    }
}