Hibernate Hello World Example 專案 之 Annotation Mapping
請先學習此篇：
Hibernate Hello World Example 專案 之 XML Mapping
一、用上一篇專案來改之。
修改程式
Message.java
HibernateUtil.java
hibernate.cfg.xml
刪除
message.hbm.xml
二、修改 Message.java
Message.java 程式內容：
package com.levin.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
/**
* Model class for Message.java
*/
@Entity
@Table(name = "MESSAGE")
public class Message implements java.io.Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name = "MESSAGE_ID")
private Integer messageId;
@Column(name = "MESSAGE_CODE")
private String messageCode;
@Column(name = "MESSAGE_NAME")
private String messageName;
public Message() {
}
public Message(String messageCode, String messageName) {
this.messageCode = messageCode;
this.messageName = messageName;
}
public Integer getMessageId() {
return messageId;
}
public void setMessageId(Integer messageId) {
this.messageId = messageId;
}
public String getMessageCode() {
return messageCode;
}
public void setMessageCode(String messageCode) {
this.messageCode = messageCode;
}
public String getMessageName() {
return messageName;
}
public void setMessageName(String messageName) {
this.messageName = messageName;
}
}
三、修改 HibernateUtil.java
主要修改內容：
將原來的這段：
return new Configuration().configure().buildSessionFactory();
改為這段程式：
return new AnnotationConfiguration().configure().buildSessionFactory();
HibernateUtil.java 程式內容：
package com.levin;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new AnnotationConfiguration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public static void shutdown() {
// Close caches and connection pools
getSessionFactory().close();
}
}
四、修改 hibernate.cfg.xml
主要修改內容：
將原來的這段：
<mapping resource="message.hbm.xml"></mapping>
改為這段程式：
<mapping class="com.levin.model.Message"></mapping>
hibernate.cfg.xml 程式內容：
<?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>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.url">jdbc:postgresql://127.0.0.1:5433/hibernateTest</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.connection.password">postgres</property>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="connection_pool_size">1</property>
<!-- validate | update | create | create-drop 如果沒要用 set value="none". -->
<!--
validate 程式執行驗證資料對應表相關資料。
update 如果table已存在，就更新，不存在則新增
create 每次執行就自動刪除所有對應的table，再新增所有對應的table
create-drop 新增所有對應的table , 程式關閉前刪除所有對應的table
-->
<property name="hbm2ddl.auto">create</property>
<property name="show_sql">true</property>
<mapping class="com.levin.model.Message"></mapping>
</session-factory>
</hibernate-configuration>
五、 本例範例資料
圖1
六、相關參考
Struts + Spring + Hibernate 目錄
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