向Oracle中插入BLOB类型

使用s2sh框架。实体类:

public class Photo implements java.io.Serializable {

	// Fields

	private Integer id;
	private Album album;
	private Timestamp createtime;
	private String name;
	private String contentType;
	private Blob thumbnail;
	private Blob content;
	private Integer orderid;
	private List<Mark> facelookmarks = new ArrayList<Mark>();
	private Set facelookactivities = new HashSet(0);
	private List<Comment> facelookcomments = new ArrayList<Comment>();
}

Photo.hbm.xml

<property name="content" type="java.sql.Blob">
            <column name="CONTENT" />
        </property>
        <property name="thumbnail" type="java.sql.Blob">
            <column name="THUMBNAIL" />
        </property>

action

FileInputStream fis = new FileInputStream(this.photoUpload);
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			byte[] b = new byte[1024];
			int n;
			while ((n=fis.read(b)) != -1) {
				out.write(b,0,n);
			}
			fis.close();
			out.close();
			byte[] content = out.toByteArray();
this.photo.setAlbum(this.album);
			this.photo.setContentType(this.photoUploadContentType);
			this.photo.setCreatetime(new Timestamp(System.currentTimeMillis()));
			this.photo.setOrderid(orderId);
			this.photo.setContent(Hibernate.createBlob(content));
			this.photo.setThumbnail(Hibernate.createBlob(thumbnail));

    this.photoUpload为上传的文件。将得到的byte[]数组通过Hibernate.createBlob方法赋值给content和thumbnail属性。
PhotoDAO

getSession().save(photo);
getSession().flush();// 调用flush方法，强制Hibernate立即执行insert sql
getSession().refresh(photo, LockMode.UPGRADE);// 通过refresh方法，强制Hibernate执行select for update

   这样在hibernate中就讲图片插入到数据库中了。
在JDBC中，需要先把BLOB字段插入空值，通过oracle.sgl.BLOB.empty_lob()方法构造空Blob对象。再次从库表读出，获得Blob句柄，然后将byte[]数组写入blob。