Hibernate（6）——映射类型

目录

 

1. 基本类型映射；

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1. 基本类型映射；

Hibernate映射自动对应数据库中表的格式；

先建立一个Book实体类：

package com.java.model;

import java.sql.Blob;
import java.util.Date;

public class Book {
    private int id;
    private String bookName; //图书名称
    private float price; //图书价格
    private boolean specialPrice; //是否是特价
    private Date publishDate; //发布日期
    private String author; //作者
    private String introduction; //简介
    private Blob bookPic; //图书图片

    public int getId() {
        return id;
    }

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

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public boolean isSpecialPrice() {
        return specialPrice;
    }

    public void setSpecialPrice(boolean specialPrice) {
        this.specialPrice = specialPrice;
    }

    public Date getPublishDate() {
        return publishDate;
    }

    public void setPublishDate(Date publishDate) {
        this.publishDate = publishDate;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getIntroduction() {
        return introduction;
    }

    public void setIntroduction(String introduction) {
        this.introduction = introduction;
    }

    public Blob getBookPic() {
        return bookPic;
    }

    public void setBookPic(Blob bookPic) {
        this.bookPic = bookPic;
    }
}

写Book映射文件，Book.hbm.xml：

<?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.java.model">

	<class name="Book" table="t_book">
		<id name="id" column="bookId">
			<generator class="native"></generator>
		</id>
		
		<property name="bookName" column="bookName" length="40"></property>
		<property name="price" column="price" type="float"></property>
		<property name="specialPrice" column="specialPrice" type="boolean"></property>
		<property name="publishDate" column="publishDate" type="date"></property>
		<property name="author" column="author" length="20"></property>
		<property name="introduction" column="introduction" length="20"></property>
		<property name="bookPic" column="bookPic" type="blob"></property>

	</class>

</hibernate-mapping>

写hibernate配置文件，hibernate.cfg.xml：

<?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>

        <!--数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useSSL=false&amp;serverTimezone=UTC</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>

       
        <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
	
        <!-- 控制台显示SQL -->
        <property name="show_sql">true</property>

        <!-- 自动更新表结构 -->
        <property name="hbm2ddl.auto">update</property>

		<!--<mapping resource="com/java/model/Student.hbm.xml"></mapping>
		<mapping resource="com/java/model/Class.hbm.xml"></mapping>-->
        <mapping resource="com/java/model/Book.hbm.xml"></mapping>
    </session-factory>

</hibernate-configuration>

 Book测试类，BookTest：

package com.java.service;

import com.java.model.Book;
import com.java.util.HibernateUtil;
import org.hibernate.LobHelper;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.Blob;
import java.text.SimpleDateFormat;

public class BookTest {
    public static void main(String[] args) throws Exception{
        SessionFactory sessionFactory= HibernateUtil.getSessionFactory();
        Session session=sessionFactory.openSession(); // 生成一个session
        session.beginTransaction(); // 开启事务

        Book book=new Book();
        book.setBookName("java编程思想");
        book.setPrice(100);
        book.setSpecialPrice(true);
        book.setPublishDate(new SimpleDateFormat("yyyy-MM-dd").parse("2019-10-23"));
        book.setAuthor("埃克尔");
        book.setIntroduction("简介...");

        LobHelper lobHelper=session.getLobHelper();
        InputStream in=new FileInputStream("c://java编程思想.jpg");
        Blob bookPic=lobHelper.createBlob(in, in.available());
        book.setBookPic(bookPic);

        //保存事务
        session.save(book);

        session.getTransaction().commit(); // 提交事务
        session.close(); // 关闭session
    }
}

运行之后看看数据库中的表：

以及数据：