Hibernate hbm映射文件的详解

Posted 2020-09-21

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错误演示

第一步：导入jar包省略

第二部：创建Person类

package cn.hibernate.bean;

import java.util.Date;

public class Person {

private Integer pId;
private String pName;
private int age;
private Date brithdayDate;
private boolean gender;
private byte[] photo;
private String desc; //描述

public Integer getpId() {
return pId;
}
public void setpId(Integer pId) {
this.pId = pId;
}

public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getpName() {
return pName;
}
public void setpName(String pName) {
this.pName = pName;
}
public Date getBrithdayDate() {
return brithdayDate;
}
public void setBrithdayDate(Date brithdayDate) {
this.brithdayDate = brithdayDate;
}
public boolean isGender() {
return gender;
}
public void setGender(boolean gender) {
this.gender = gender;
}
public byte[] getPhoto() {
return photo;
}
public void setPhoto(byte[] photo) {
this.photo = photo;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
}

第三步：创建Person的映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.hibernate.bean">

<class name="Person" table="t_person">
<id name="pId">

<generator class="native"></generator>
</id>
<property name="pName" >
<column name="pName" sql-type="varchar(50)"></column>
</property>
<property name="age" type="integer" column="age"></property>
<property name="brithdayDate" type="date"></property>
<property name="gender" type="boolean"></property>
<property name="photo" type="binary" not-null="true" unique="false" length="350000"></property>
<property name="desc" column="`desc`"></property>
</class>
</hibernate-mapping>

第四步：创建核心配置文件hibernate.cfg.xml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="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost:3306/minemysql
</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>


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



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

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

<property name="hibernate.use_sql_comments">true</property>


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


//省略下面会给讲解什么时候需要配置<property name="javax.persistence.validation.mode">none</property>

</session-factory>
</hibernate-configuration>

第五步:创建测试类

package cn.hibernate.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Date;

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

import cn.hibernate.bean.Person;

public class TestApp {

@Test
public void demo01() throws IOException{
FileInputStream is = new FileInputStream(new File("1.jpg"));
byte[] photo = new byte[is.available()];
is.read(photo);
is.close();

Person son = new Person();
son.setpName("杰克1");
son.setAge(19);
son.setBrithdayDate(new Date());
son.setGender(true);
son.setPhoto(photo);
son.setDesc("这个家伙有头像");

Configuration configuration = new Configuration().configure();
//采用手动方式添加
configuration.addClass(Person.class);

SessionFactory sessionFactory = configuration.buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();

session.save(son);

transaction.commit();
session.close();
sessionFactory.close();

}
}