星期二, 十二月 29, 2015 21:20:00
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使用注解的方式进行操作hibernate定义实体
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步骤:
1.引入hibernate-annotations.jar
? ?"hibernate-commons-annotations.jar"
? ?"ejb3-persistence.jar"?
2.建一个Teacher类
3.在数据库中建teacher表
? ?create table teacher(id int primary key,name varchar(20),title varchar(20))；
4.在Teacher加入注解:@Entity ? //主键@Id
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/*1.实体类(使用annotation进行实现，告诉hibernate是实体类，
?* 不需要再建立Teacher.hbm.xml文件进行映射)
?* 2.hibernate.cfg.xml进行配置即可
?* 3.建立一个TeacherTest
*/
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5.在hibernate.cfg.xml进行配置
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?<mapping class="com.zhuhw.hibernate.Teacher"/>
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6.建立TeacherTest类
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//因为使用的annotation，所以Configuration要使用AnnotationConfiguration
Configuration cf = new AnnotationConfiguration();
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运行即可
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代码案例:
package com.zhuhw.hibernate;
import javax.persistence.Entity;
import javax.persistence.Id;
/*1.实体类(使用annotation进行实现，告诉hibernate是实体类，
* 不需要再建立Teacher.hbm.xml文件进行映射)
* 2.hibernate.cfg.xml进行配置即可
* 3.建立一个TeacherTest
*/
@Entity
public class Teacher {
private int id;
private String name;
private String title;
//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 String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
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<?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">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<!-- JDBC connection pool (use the built-in) -->
<!-- <property name="connection.pool_size">1</property> -->
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</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>-->
<!-- hibernate去哪里找这个配置文件 -->
<mapping resource="com/zhuhw/hibernate/Student.hbm.xml"/>
<mapping class="com.zhuhw.hibernate.Teacher"/>
</session-factory>
</hibernate-configuration>
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import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import com.zhuhw.hibernate.Student;
import com.zhuhw.hibernate.Teacher;
public class TeacherTest {
public static void main(String[] args){
Teacher t = new Teacher();
t.setId(2);
t.setName("yuzhou");
t.setTitle("aaaa");
//因为使用的annotation，所以Configuration要使用AnnotationConfiguration
Configuration cf = new AnnotationConfiguration();
SessionFactory sf = cf.configure().buildSessionFactory();
Session session = sf.openSession();
//在hibernate中执行操作要在一个事务里面
session.beginTransaction();
session.save(t);
session.getTransaction().commit();
session.close();
sf.close();
}
}
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运行结果:
Hibernate: insert into Teacher (name, title, id) values (?, ?, ?)
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总结:
1.请务必建立自己动手查一手文档的能力
2.重要的是
? ? ?1.要建立了自己动手查一手文档的信心
? ? ?2.还有建立自己动手查一手文档的习惯
? ? ?3.主动学习，放弃被动接受灌输的习惯
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星期二, 十二月 29, 2015 ? 22:10:48
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原文：http://yuzhouxiner.iteye.com/blog/2267528