Hibernate Gossip: Blob、Clob - Oracle 9i

• 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> 

        ....
        <property name="hibernate.jdbc.batch_size">0</property> 

        <mapping resource="onlyfun/caterpillar/File.hbm.xml"/> 
 
    </session-factory> 

</hibernate-configuration>

• FILE.java

package onlyfun.caterpillar;

import java.sql.Blob;
import java.sql.Clob;

public class File {
    private Integer id;
    private Clob des;
    private Blob image;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    } 

    public Clob getDes() {
        return des;
    }

    public void setDes(Clob des) {
        this.des = des;
    }

    public Blob getImage() {
        return image;
    }

    public void setImage(Blob image) {
        this.image = image;
    }
}

• FILE.hbm.xml

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping 
 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 
    <class name="onlyfun.caterpillar.File" table="t_file"> 

    <id name="id" column="id"> 
        <generator class="native"/> 
    </id> 

    <property name="des" column="des"/> 
    <property name="image" column="image"/> 
 </class> 

</hibernate-mapping>

• BlobClobDemo.java

package onlyfun.caterpillar;

import java.io.FileInputStream;
import java.io.IOException;
import java.sql.SQLException;

import org.hibernate.Hibernate;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class BlobClobDemo {
    public static void main(String[] args) throws IOException, SQLException {
        // Configuration 負責管理 Hibernate 配置訊息
        Configuration config = new Configuration().configure();
        // 根據 config 建立 SessionFactory
        // SessionFactory 將用於建立 Session
        SessionFactory sessionFactory = config.buildSessionFactory(); 
	
        File file = new File();
        // 先建立空的欄位
        file.setDes(Hibernate.createClob(" "));
        file.setImage(Hibernate.createBlob(new byte[1]));

        Session session = sessionFactory.openSession();
        Transaction tx = session.beginTransaction();
        session.save(file);

        // 執行flush，讓Hibernate INSERT 空欄位
        session.flush();
        // 執行refresh，讓Hibernate執行SELECT FOR UPDATE
        session.refresh(file, LockMode.UPGRADE);
	
        FileInputStream fileInputStream = 
                  new FileInputStream("c:\\workspace\\Wind.bmp");
	
        // 重新設定真正要寫入的Blob/Clob資料
        file.setDes(Hibernate.createClob("...blah...blah..."));
        file.setImage(Hibernate.createBlob(fileInputStream));

        // 再次save
        session.save(file);
	
        tx.commit();
        session.close();
        fileInputStream.close();

        sessionFactory.close();

    }
}