Hibernate实现Oracle BLOB的数据读写(1)

　　

　　开发中文件上传到服务器，一般将文件保存在Web服务器的某个目录下，除非有特殊要求将文件存到数据库中保存。
　　本文主要基于学习的目的而作。
　　测试环境：Hibernate3.6.7，Oracle 10g Express，JDK7，Win7
　　1，数据库脚本
　　


create table TUser  (
ID                   char(32)                        not null,
name               varchar(10char)                 not null,
photo               blob,                              --头像
constraint PK_TUser primary key (ID)
);
 　　2，Hibernate配置文件，本文基于传统的hibernate.cfg.xml
　　


<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">
oracle.jdbc.driver.OracleDriver
</property>
<property name="connection.url">
jdbc:oracle:thin:@localhost:1521:XE
</property>
<property name="connection.username">tanlan</property>
<property name="connection.password">tanlan</property>
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="show_sql">true</property>
<mapping resource="com/tanlan/hibernate/entity/User.hbm.xml" />
</session-factory>
</hibernate-configuration>

 
3,编写实体类User.java

package com.tanlan.hibernate.entity;
public class User {
private String id;
private String name;
private byte[] photo;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public byte[] getPhoto() {
return photo;
}
public void setPhoto(byte[] photo) {
this.photo = photo;
}
}



4,编写对应的映射文件，User.hbm.xml

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.tanlan.hibernate.entity">
<class name="User" table="TUser">
<id name="id">
<generator class="uuid" />
</id>
<property name="name" />
<property name="photo" type="binary" />
</class>
</hibernate-mapping>


 5,测试代码


package com.tanlan.hibernate.test;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.tanlan.hibernate.entity.User;
public class TestUser {
public static void main(String[] args) {
addUser();
//getUserById();
//update();
}
private static void addUser() {
User user = new User();
user.setName("谭岚");
File photo = new File("I:\\1.jpg");
try {
FileInputStream is = new FileInputStream(photo);
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] temp = new byte[512];
int i = 0;
while ((i = is.read(temp, 0, temp.length)) != -1) {
os.write(temp, 0, temp.length);
}
os.close();
is.close();
user.setPhoto(os.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
Session session = openSession();
Transaction transaction = session.beginTransaction();
session.save(user);
transaction.commit();
}
private static void getUserById() {
Session session = openSession();
User user = (User) session.get(User.class,
"402881e432993eae0132993eb7d20000");
byte[] photo = user.getPhoto();
try {
FileOutputStream os = new FileOutputStream("E:\\111.jpg");
os.write(photo);
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private static void update() {
User user = new User();
user.setId("402881e432993eae0132993eb7d20000");
user.setName("新名");
File photo = new File("I:\\2.jpg");
try {
FileInputStream is = new FileInputStream(photo);
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] temp = new byte[512];
int i = 0;
while ((i = is.read(temp, 0, temp.length)) != -1) {
os.write(temp, 0, temp.length);
}
os.close();
is.close();
user.setPhoto(os.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
Session session = openSession();
Transaction transaction = session.beginTransaction();
session.update(user);
transaction.commit();
}
private static Session openSession() {
Configuration cfg = new Configuration().configure();
return cfg.buildSessionFactory().openSession();
}
}