hibernate ——helloWorld程序

1、项目结构

2、hibernate实现了Java类 和 数据库表的映射（Map）

　　先看一下Student的Java类和对应的数据库表

 1 package com.pt.hibernate;
 2
 3 public class Student {
 4     private int id;
 5     private String name;
 6     private int age;
 7     public int getId() {
 8         return id;
 9     }
10     public void setId(int id) {
11         this.id = id;
12     }
13     public String getName() {
14         return name;
15     }
16     public void setName(String name) {
17         this.name = name;
18     }
19     public int getAge() {
20         return age;
21     }
22     public void setAge(int age) {
23         this.age = age;
24     }
25 }

Student.java

　　创建Student表的SQL语句

1 CREATE TABLE `student` (
2   `Id` int(20) NOT NULL,
3   `Name` varchar(20) DEFAULT NULL,
4   `Age` int(3) DEFAULT NULL,
5   PRIMARY KEY (`Id`)
6 ) ENGINE=InnoDB DEFAULT CHARSET=latin1

Creat table

3、通过student.xml配置文件，将Java类和数据库表关联起来

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5
 6 <hibernate-mapping package="com.pt.hibernate">
 7     <class name="Student" table="student">
 8         <id name="id" column="id" ></id>
 9         <property name="name" column="name" ></property>
10         <property name="age" column="age" ></property>
11     </class>
12 </hibernate-mapping>

Student.xml

4、通过hibernate.cfg.xml配置文件，初始化hibernate所需要的信息

 1 <?xml version=‘1.0‘ encoding=‘utf-8‘?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4         "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5
 6 <hibernate-configuration>
 7
 8     <session-factory>
 9
10         <!-- Database connection settings -->
11         <!-- <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
12                     <property name="connection.url">jdbc:hsqldb:hsql://localhost/TestDB</property> -->
13
14         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
15         <property name="connection.url">jdbc:mysql://localhost/test?useUnicode=true&amp;characterEncoding=UTF-8</property>
16         <property name="connection.username">root</property>
17         <property name="connection.password"></property>
18
19         <!-- SQL dialect -->
20         <property name="dialect">
21             org.hibernate.dialect.MySQLInnoDBDialect
22         </property>
23         <property name="show_sql">true</property>
24          <mapping resource="com/pt/hibernate/Student.xml"/>
25     </session-factory>
26
27 </hibernate-configuration>

hibernate.cfg.xml

5、测试

 1 import org.hibernate.Session;
 2 import org.hibernate.SessionFactory;
 3 import org.hibernate.cfg.Configuration;
 4
 5 import com.pt.hibernate.Student;
 6
 7
 8 public class StudentTest {
 9     public static void main(String[] arges){
10         Student s= new Student();
11         s.setId(20111901);
12         s.setName("panteng");
13         s.setAge(23);
14         Configuration cfg = new Configuration();
15         SessionFactory sessionFactory = cfg.configure().buildSessionFactory();
16         Session session = sessionFactory.openSession();
17         session.beginTransaction();
18         session.save(s);
19         session.getTransaction().commit();
20         session.close();
21         sessionFactory.close();
22
23     }
24 }

StudentTest