由于版本的不同,项目中需要引入的jar的也会相应的不同,这个可以根据错误提示来相应的加入jar包。
project工程目录以及jar包(除了ejb-persistence.jar需要自己手动下载,其他jar包hibernate压缩包中都可以找到)如下:
ejb3-persistence.jar下载地址:http://www.java2s.com/Code/Jar/e/Downloadejb3persistencejar.htm
1.Teacher.java
package com.bjsxt.model; import javax.persistence.Entity; import javax.persistence.Id; /**1.注意:这里不能使用@org.hibernate.annotations.Entity。 *2.查看:javax.persistence.Entity与org.hibernate.annotations.Entity的区别 *3.从Entity所在包可以知道Annotaion不依赖hibernate */ //@Entity说明Teacher是实体类 @Entity public class Teacher { private int id; private String name; private int age; //@Id说明属性id是主键 @Id public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
2.在数据库创建于Teacher对应的表,表结构如下:
create table teacher( id number primary key, name varchar2(20), age number(3) )
3.建立hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?> <!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">oracle.jdbc.driver.OracleDriver</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</property> <property name="connection.username">system</property> <property name="connection.password">niit</property> <!-- JDBC connection pool (use the built-in) --> <!-- <property name="connection.pool_size">1</property> --> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.OracleDialect</property> <!-- Enable Hibernate's automatic session context management --> <!--<property name="current_session_context_class">thread</property> --> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</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">update</property>--> <!-- <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/>--> <mapping class="com.bjsxt.model.Teacher"/><!--annotation--> </session-factory> </hibernate-configuration>
4.建立测试类
import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; import org.hibernate.cfg.Configuration; import com.bjsxt.model.Teacher; public class TeacherTest { public static void main(String[] args) { Teacher s = new Teacher(); s.setId(1); s.setName("t1"); s.setAge(22); //注意:这个要使用AnnotationConfiguration,而不是Configuration Configuration cfg = new AnnotationConfiguration(); SessionFactory sf = cfg.configure().buildSessionFactory(); Session session = sf.openSession();// 拿到session session.beginTransaction();// 还回值可以不用存起来 session.save(s); session.getTransaction().commit(); session.close(); sf.close(); } }