How Can i Store photo (image) in column of table

This assumes that the images in question currently reside on the database server. If you want to upload images into the database from a client machine, you will need an extra step where you move the files to the appropriate directory or directories on the server. This example will store the images in a BLOB column, rather than a much more flexible interMedia ORDImage column. A BLOB column is fine if you only want to store and retrieve the image, but interMedia gives you significantly more flexibility to manipulate the image, extract metadata, etc.

Create the directory

First, you will want to tell Oracle where it can find the images you want to insert into the database. The easiest way to do this is to create a directory object. In this case, I will be loading images from 'c:/temp/img/'.



CREATE DIRECTORY images AS 'c:/temp/img/'


If you don't have the CREATE DIRECTORY privilege, you will need to have someone else, like your DBA, create the directory and grant you READ access to it.



GRANT READ ON DIRECTORY images TO scott;


Create the Table to Hold the Images



CREATE TABLE images (
image_name VARCHAR2( 100 ),
mime_type VARCHAR2( 100 ),
content BLOB
)


Create a Stored Procedure to Load the Image



CREATE OR REPLACE PROCEDURE load_image( file_name VARCHAR2 )
AS
file_lob BFILE;
binary_lob BLOB;
mime_type images.mime_type%type;
extension_pos NUMBER;
BEGIN
-- Use the extension of the file name to determing the MIME-type
-- The MIME-type for a .JPG file will be image/jpg
extension_pos := INSTR( file_name, '.' );
mime_type := 'image/' || SUBSTR( file_name,
extension_pos + 1,
LENGTH( file_name ) );

-- Insert a new row into the images table. Get the LOB locator
-- for the newly inserted row-- we will be using that to insert
-- the content from the file.
INSERT INTO IMAGES( image_name, mime_type, content )
VALUES( file_name, mime_type, empty_blob() )
RETURNING content INTO binary_lob;

-- Open up the file in the IMAGES directory named file_name,
-- load that file into the newly created LOB locator, and
-- close the file
file_lob := BFILENAME( 'IMAGES', file_name );
dbms_lob.fileOpen ( file_lob, dbms_lob.file_readOnly );
dbms_lob.loadFromFile( binary_lob,
file_lob,
dbms_lob.getLength( file_lob ) );
dbms_lob.fileClose ( file_lob );
END;


Load the Image



scott@jcave > exec load_image( 'sample.jpg' );

PL/SQL procedure successfully completed.

scott@jcave > column image_name format a30;
scott@jcave > column mime_type format a15;
scott@jcave > column length format 999999;
scott@jcave >
1 SELECT image_name, mime_type,dbms_lob.getLength( content ) length
2 FROM images;

no rows selected

Elapsed: 00:00:00.00
scott@jcave > /

IMAGE_NAME MIME_TYPE LENGTH
------------------------------ --------------- -------
sample.jpg image/jpg 9894


Regards
Lakmal
 
资源下载链接为: https://pan.quark.cn/s/f989b9092fc5 HttpServletRequestWrapper 是 Java Servlet API 中的一个工具类,位于 javax.servlet.http 包中,用于对 HttpServletRequest 对象进行封装,从而在 Web 应用中实现对 HTTP 请求的拦截、修改或增强等功能。通过继承该类并覆盖相关方法,开发者可以轻松地自定义请求处理逻辑,例如修改请求参数、添加请求头、记录日志等。 参数过滤:在请求到达处理器之前,可以对请求参数进行检查或修改,例如去除 URL 编码、过滤敏感信息或进行安全检查。 请求头操作:可以修改或添加请求头,比如设置自定义的 Content-Type 或添加认证信息。 请求属性扩展:在原始请求的基础上添加自定义属性,供后续处理使用。 日志记录:在处理请求前记录请求信息,如 URL、参数、请求头等,便于调试和监控。 跨域支持:通过添加 CORS 相关的响应头,允许来自不同源的请求。 HttpServletRequestWrapper 通过继承 HttpServletRequest 接口并重写其方法来实现功能。开发者可以在重写的方法中添加自定义逻辑,例如在获取参数时进行过滤,或在读取请求体时进行解密。当调用这些方法时,实际上是调用了包装器中的方法,从而实现了对原始请求的修改或增强。 以下是一个简单的示例,展示如何创建一个用于过滤请求参数的包装器: 在 doFilter 方法中,可以使用 CustomRequestWrapper 包装原始请求: 这样,每当调用 getParameterValues 方法时,都会先经过自定义的过滤逻辑。 HttpServletRequestWrapper 是 Java Web 开发中一个强大的工具,它提供了灵活的扩展性,允许开发者
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