这次采用的是EJB3的配置
测试环境与前次一样：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，配置文件，即META-INF/persistence.xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
org.hibernate.ejb.HibernatePersistence
3,编写实体类User.java
package com.tanlan.hibernate.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name = "TUser")
public class User {
@Id
@GenericGenerator(name = "uid", strategy = "uuid")
@GeneratedValue(generator = "uid")
private String id;
@Column
private String name;
@Lob
@Column
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.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 javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import com.tanlan.hibernate.entity.User;
public class TestUser {
public static void main(String[] args) {
addUser();
//getUserById();
}
private static void addUser() {
User user = new User();
user.setName("谭岚");
File photo = new File("D:\\test.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();
}
EntityManager em = createEntityManager();
EntityTransaction transaction = em.getTransaction();
transaction.begin();
em.persist(user);
transaction.commit();
}
private static void getUserById() {
EntityManager em = createEntityManager();
User user = (User) em.find(User.class,"402881e432aad3340132aad33c210000");
em.close();
byte[] photo = user.getPhoto();
try {
FileOutputStream os = new FileOutputStream("E:\\333.jpg");
os.write(photo);
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private static EntityManager createEntityManager() {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");
return emf.createEntityManager();
}
}
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2011-09-27 20:27
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