使用annotations注解的hibernate的简单示例

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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>

<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>

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

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

<property name="hbm2ddl.auto">create</property>

</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）