Hibernate學習筆記（一）----初識Hibernate

原創

lywnko

2020-02-20 17:51

一、環境準備

下載hibernate-distribution-3.3.2.GA-dist

下載hibernate-annotations-3[1].4.0.GA

二、創建第一個Hibernate程序

1）新建一個javaproject，導入hibernate需要的jar包：

i. hibernate core

ii. /required

iii. slf4j-nop jar（注意要和/required目錄下的slf4j-api版本相對應）

2）引入MySQL的JDBC驅動，在mysql中建立對應的數據庫以及表

a) create database hibernate；

b) use hibernate；

create table Student (id int primary key,namevarchar(20), age int)；

3）建立hibernate配置文件hibernate.cfg.xml

在hibernate的文檔中有對應的模版，將其複製下來，並修改成如下配置：

<?xmlversion='1.0'encoding='utf-8'?>

<!DOCTYPEhibernate-configurationPUBLIC

"-//Hibernate/Hibernate Configuration DTD3.0//EN"

"http://hibernate.sourceforge.NET/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<propertyname="connection.driver_class">

com.mysql.jdbc.Driver

</property>

<propertyname="connection.url">

jdbc:mysql://localhost/hibernate

</property>

<propertyname="connection.username">root</property>

<propertyname="connection.password">123</property>

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

<propertyname="cache.provider_class">

org.hibernate.cache.NoCacheProvider

</property>

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

<mappingresource="com/xuhaibin/hibernate/model/Student.hbm.xml"/>

</session-factory>

</hibernate-configuration>

<mapping> 要設置成對應的映射文件

4)建立Student的映射文件student.hbm.xml

參考文檔中的示例映射文件，修改成如下內容：

<?xmlversion="1.0"?>

<!DOCTYPEhibernate-mappingPUBLIC

"-//Hibernate/Hibernate Mapping DTD3.0//EN"

"http://hibernate.sourceforge.Net/hibernate-mapping-3.0.dtd">

<hibernate-mappingpackage="com.xuhaibin.hibernate.model">

<classname="Student">

<idname="id"/>

<propertyname="name"/>

<propertyname="age"/>

</class>

</hibernate-mapping>

5)在com.xuhaibin.hibernate.model包下建立相應的Student類，生成get，set方法

6）建立測試類StudentTest內容如下:

[java] view plain copy

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.xuhaibin.hibernate.model.Student;
public class StudentTest {
public static voidmain(String[] args){
Student s = new Student();
s.setId(1);
s.setName("s1");
s.setAge(1);
Configuration cfg = newConfiguration();
SessionFactory sf =cfg.configure().buildSessionFactory();
Session session =sf.openSession();
session.beginTransaction();
session.save(s);
session.getTransaction().commit();
session.close();
sf.close();
}
}

三、使用annotation建立Teacher類，@Entity註解實體，@id註解主鍵

package com.xuhaibin.hibernate.model;  
  
   
  
import javax.persistence.Entity;  
  
import javax.persistence.Id;  
  
   
  
@Entity  
  
public class Teacher {  
  
     private int id;  
  
     private String name;  
  
     private String title;  
  
      
  
     @Id  
  
     public int getId() {  
  
         return id;  
  
     }  
  
     public void setId(int id) {  
  
         this.id = id;  
  
     }  
  
     public String getName() {  
  
         return name;  
  
     }  
  
     public void setName(Stringname) {  
  
         this.name = name;  
  
     }  
  
     public String getTitle() {  
  
         return title;  
  
     }  
  
     public void setTitle(Stringtitle) {  
  
         this.title = title;  
  
     }  
}