使用annotations注解的hibernate的简单示例

一、写bean实体类Book.java，并注解

1. package edu.hzu.entity;

 

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table (name = "book")
public class Book {
 private int id;
 private String name;
 private Author author;
 private Press press;
 private Date publishdate;
 private int pageCount;
 private float price;
 private String introduction;
 private String cover;
 private BookCategory bookCategory;
 
 @Id
 @GeneratedValue (strategy = GenerationType.AUTO)
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 
 @Column (name = "name")
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 
 @ManyToOne (targetEntity = edu.hzu.entity.Author.class)
 public Author getAuthor() {
  return author;
 }
 public void setAuthor(Author author) {
  this.author = author;
 }
 
 @ManyToOne (targetEntity = edu.hzu.entity.Press.class)
 public Press getPress() {
  return press;
 }
 public void setPress(Press press) {
  this.press = press;
 }
 
 @Column (name = "date")
 public Date getPublishdate() {
  return publishdate;
 }
 public void setPublishdate(Date publishdate) {
  this.publishdate = publishdate;
 }
 
 @Column (name = "pageCount")
 public int getPageCount() {
  return pageCount;
 }
 public void setPageCount(int pageCount) {
  this.pageCount = pageCount;
 }
 
 @Column (name = "price")
 public float getPrice() {
  return price;
 }
 public void setPrice(float price) {
  this.price = price;
 }
 
 @Column (name = "introduction")
 public String getIntroduction() {
  return introduction;
 }
 public void setIntroduction(String introduction) {
  this.introduction = introduction;
 }
 
 @Column (name = "cover")
 public String getCover() {
  return cover;
 }
 public void setCover(String cover) {
  this.cover = cover;
 }
 
 @ManyToOne (targetEntity = edu.hzu.entity.BookCategory.class)
 public BookCategory getBookCategory() {
  return bookCategory;
 }
 public void setBookCategory(BookCategory bookCategory) {
  this.bookCategory = bookCategory;
 }
 
 

}

 

二、在src根目录下见hibernate.cfg.xml文件

<!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://localhost:3306/test</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>

        <mapping class="edu.hzu.entity.Book"/>
     <mapping class="edu.hzu.entity.BookCategory"/>
     <mapping class="edu.hzu.entity.Author"/>
     <mapping class="edu.hzu.entity.AuthorCategory"/>
     <mapping class="edu.hzu.entity.Site"/>
     <mapping class="edu.hzu.entity.Price"/>
     <mapping class="edu.hzu.entity.Press"/>

    </session-factory>

</hibernate-configuration>

 

三、做测试类Test.java

 

package edu.hzu.test;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.classic.Session;

 

public class Test {
 public static void main(String[] args) {
  AnnotationConfiguration a = new AnnotationConfiguration();
  Session session = a.configure().buildSessionFactory().openSession();
 }
}

 

通过此测试类即可在数据库中生成数据库及表（当然这只是一个例子，其实只给出了一个hibernate使用的框架，要真间数据库，还得在对应的建相关的类：Author、BookCategory、Press等，方法与Book类似）