java核心技术记要——BLOB读写

读取图片：

PrearedStatement stat=conn.prearedStatement ("select ... from ...where id=?");

stat.set(1,001);

Result result=stat.executeQuery();

if(result.next()){

Blob blob=result.getBlob(1);

Image img=ImageIO.read(blob.getInputStream());

}

存储图片:

Blob blob=conn.crreateBlob();

int offset=0;

OutputStream out=blob.setBinaryStream(offset);

ImageIO.write(img,"PNG",out);

PreparedStatement stat=conn.preparedStatement("insert into ... value(?,?)");

stat.set(1,001);

stat.set(2,blob);

stat.executeUpdate();