EBS开发附件上传和下载功能
上传
Oracle ERP二次开发中使用的方式有两种，一是通过标准功能，在系统管理员中定义即可，不用写代码，就可以使几乎任何Form具有附件功能，具体参考系统管理员文档；二是通过PL/SQL Gateway，需要我们便写代码完成。该方式其实和上述方式一的后台实现是一样的
程序说明
1、Package功能，测试通过PL/SQLGateway（MOD PL/SQL）完成文件上传下载
2、本Package直接使用EBS的DAD，所以对应的Document表为APPS.fnd_lobs_document
在非EBS环境开发，需要自己定义DAD请参考9ias_plsql.pdf和9ias.pdf，步骤如下
a、创建Document表，参照fnd_lobs_document和fnd_lobs_documentpart，表名自己起
b、配置DAD，配置文件为$IAS_ORACLE_HOME/Apache/modplsql/cfg/wdbsvr.app
c、参照fnd_gfm，改写成自己的包，或者简单点改写本Package也行
3、需要把我们写的包在system administrator--> security --> Web PL/SQL里面注册一下，
不然通过IE打开会提示用户名和密码
4、本测试把在“接口”fnd_lobs_document中的附件，按照EBS的做法保存到fnd_lobs，
也可以改写代码保存到自己的表，一般没必要，我们自己的表保存File_ID即可
5、一个表中的BLOB等数据可以直接插入另一个表
下载
上传的文件时存到了fnd_lobs表中以BLOB数据的形式存储，现在要把BLOB数据以原文件的格式读取出来，并且给最终用户提供下载该文件的功能
方法如下
declare
v_file_id NUMBER;
url VARCHAR2(500);
begin
--Get the file_id of the file which you want to download in fnd_lobs
v_file_id := xxxxxx;
--Get The Download URL
url := fnd_gfm.construct_download_url(fnd_web_config.gfm_agent,v_file_id,TRUE);
fnd_utilities.open_url(url);
end;
以上的方法就可以轻松的实现下载存储在fnd_lobs中的文件，只要告诉fnd_gfm.construct_download_url在fnd_lobs表中文件的file_id，就可以轻松取得URL，使用fnd_utilities.open_url就可以下载该文件；不过现在还有一个问题就是要在工作流发送的消息找到一个东西（比如说一个按钮、超链接）来执行下载文件的方法可以在document类型的ATTRIBUTE里设置一个超链接，然后让这个超链接的地址指向我已经取得的下载文件的URL
CREATE OR REPLACE PACKAGE oracle_up_down AUTHID CURRENT_USER IS
/********************************************
1、Package功能，测试通过PL/SQL Gateway（MOD PL/SQL）完成文件上传下载
2、本Package直接使用EBS的DAD，所以对应的Document表为APPS.fnd_lobs_document
在非EBS环境开发，需要自己定义DAD请参考9ias_plsql.pdf和9ias.pdf，步骤如下
1、创建Document表，参照fnd_lobs_document和fnd_lobs_documentpart，表名自己起
2、配置DAD，配置文件为$IAS_ORACLE_HOME/Apache/modplsql/cfg/wdbsvr.app
3、参照fnd_gfm，改写成自己的包，或者简单点改写本Package也行
3、需要把我们写的包在system administrator --> security --> Web PL/SQL里面注册一下，
不然通过IE打开会提示用户名和密码
4、本测试把在“接口”fnd_lobs_document中的附件，按照EBS的做法保存到fnd_lobs，
也可以改写代码保存到自己的表，一般没必要，我们自己的表保存File_ID即可
5、一个表中的BLOB等数据可以直接插入另一个表
********************************************/
/***************上传文件下载过程*************
1、初始化access id
select fnd_gfm.authorize(-1) from dual;
2、准备url，下面是例子
SELECT fnd_web_config.trail_slash(fnd_profile.VALUE('APPS_WEB_AGENT')) ||
'oracle_up_down.upload_form?p_access_id=上面1的查询结果'
FROM dual;
3、用浏览器打开url即可。如果是通过Form打开url上传，那么把上面代码放入form的相应trigger
4、查看File_ID
SELECT fnd_web_config.trail_slash(fnd_profile.VALUE('APPS_WEB_AGENT')) ||
'oracle_up_down.upload_form?p_access_id=上面1的查询结果'
FROM dual;
4、把文件下载下来验证
SELECT fnd_web_config.trail_slash(fnd_profile.VALUE('APPS_WEB_AGENT')) ||
'oracle_up_down.download_file?p_file_id=上面4的查询结果' || chr(38) ||
'p_access_id=上面1的查询结果'
FROM dual;
5、可以直接在PL/SQL Developer 6以上中Select出来点击File_Data察看
Test脚本
http://hw321.huawei.com:8003/pls/scp/fnd_web.SHOWENV;
select fnd_gfm.authorize(-1) from dual;
select * from applsys.fnd_lob_access t where t.access_id = 354896931892;
http://hw321.huawei.com:8003/pls/SCP/oracle_up_down.upload_form?p_access_id=354896931892;
select * from applsys.fnd_lob_access t where t.access_id = 354896931892;
select * from applsys.fnd_lobs_document t;
http://hw321.huawei.com:8003/pls/SCP/oracle_up_down.download_file?p_file_id=3548970&p_access_id=354896931892;
Select * from fnd_lobs flb where flb.file_id = 3548970;
****************上传文件下载过程*****************/
g_agent CONSTANT VARCHAR2(100) := fnd_web_config.trail_slash(fnd_profile.VALUE('APPS_WEB_AGENT'));
g_package_name CONSTANT VARCHAR2(100) := 'oracle_up_down';
g_upload_url CONSTANT VARCHAR2(100) := g_package_name || '.upload_file';
g_download_url CONSTANT VARCHAR2(100) := g_package_name ||
'.download_file';
g_cancel_url CONSTANT VARCHAR2(100) := g_package_name || '.cancel_file';
--完成上传：把在网关中的数据抓到自己的表
PROCEDURE upload_file(p_file_name IN VARCHAR2, p_access_id IN NUMBER);
--显示HTML取消页面
PROCEDURE upload_cancel;
--显示HTML上传页面
PROCEDURE upload_form(p_access_id IN NUMBER DEFAULT NULL);
--下载文件
PROCEDURE download_file(p_file_id IN NUMBER,
p_access_id IN NUMBER,
p_purge IN VARCHAR2 DEFAULT NULL);
PROCEDURE download_file_html(p_file_id IN NUMBER,
p_access_id IN NUMBER,
p_purge IN VARCHAR2 DEFAULT NULL);
END;
/
CREATE OR REPLACE PACKAGE BODY oracle_up_down IS
--add '/' to a string
FUNCTION trail_slash(p_val IN VARCHAR2) RETURN VARCHAR2 IS
l_copy_val VARCHAR2(2000);
BEGIN
l_copy_val := p_val;
WHILE (substr(l_copy_val, -1, 1) = '/') LOOP
l_copy_val := substr(l_copy_val, 1, length(l_copy_val) - 1);
END LOOP;
RETURN l_copy_val || '/';
END;
PROCEDURE err_msg(NAME VARCHAR2) IS
BEGIN
fnd_message.set_name('FND', 'SQL_PLSQL_ERROR');
fnd_message.set_token('ROUTINE', 'FND_GFM.' || NAME);
fnd_message.set_token('ERRNO', SQLCODE);
fnd_message.set_token('REASON', SQLERRM);
END err_msg;
/*
从fnd_gfm拷贝过来，原来的代码是删除整个fnd_lobs_document，不知道为何，现在改为仅删除上传的文件
*/
FUNCTION confirm_upload(access_id NUMBER,
file_name VARCHAR2,
program_name VARCHAR2 DEFAULT NULL,
program_tag VARCHAR2 DEFAULT NULL,
expiration_date DATE DEFAULT NULL,
LANGUAGE VARCHAR2 DEFAULT userenv('LANG'),
wakeup BOOLEAN DEFAULT FALSE)
RETURN NUMBER IS
fid NUMBER := -1;
fn VARCHAR2(256);
mt VARCHAR2(240);
bloblength NUMBER; -- bug 3045375, added variable to set length of blob.
BEGIN
IF (fnd_gfm.authenticate(confirm_upload.access_id)) THEN
SELECT fnd_lobs_s.NEXTVAL INTO fid FROM dual;
fn := substr(confirm_upload.file_name,
instr(confirm_upload.file_name, '/') + 1);
-- bug 3045375, added select to get length of BLOB.
SELECT dbms_lob.getlength(blob_content), mime_type
INTO bloblength, mt
FROM fnd_lobs_document
WHERE NAME = confirm_upload.file_name
AND rownum = 1;
-- bug 3045375, added if to check length of blob.
IF bloblength > 0 THEN
INSERT INTO fnd_lobs
(file_id,
file_name,
file_content_type,
file_data,
upload_date,
expiration_date,
program_name,
program_tag,
LANGUAGE,
file_format)
(SELECT confirm_upload.fid,
fn,
ld.mime_type,
ld.blob_content,
SYSDATE,
confirm_upload.expiration_date,
confirm_upload.program_name,
confirm_upload.program_tag,
confirm_upload.LANGUAGE,
fnd_gfm.set_file_format(mt)
FROM fnd_lobs_document ld
WHERE ld.NAME = confirm_upload.file_name
AND rownum = 1);
IF (SQL%ROWCOUNT <> 1) THEN
RAISE no_data_found;
END IF;
UPDATE fnd_lob_access
SET file_id = fid
WHERE access_id = confirm_upload.access_id;
IF wakeup THEN
dbms_alert.signal('FND_GFM_ALERT' || to_char(access_id),
to_char(fid));
END IF;
-- bug 3045375, added else to return fid = -2.
ELSE
fid := -2;
END IF;
DELETE FROM fnd_lobs_document ld
WHERE ld.NAME = confirm_upload.file_name;
--delete from fnd_lobs_documentpart;
END IF;
RETURN fid;
EXCEPTION
WHEN OTHERS THEN
DELETE FROM fnd_lobs_document ld
WHERE ld.NAME = confirm_upload.file_name;
--delete from fnd_lobs_documentpart;
err_msg('confirm_upload');
RAISE;
END;
PROCEDURE upload_file(p_file_name IN VARCHAR2, p_access_id IN NUMBER) IS
l_file_id NUMBER;
BEGIN
l_file_id := confirm_upload(access_id => p_access_id,
file_name => p_file_name,
program_name => g_package_name);
IF l_file_id NOT IN (-1, -2) THEN
-- File upload completed
htp.htmlopen;
htp.headopen;
htp.title('文件上传');
htp.headclose;
htp.bodyopen;
htp.img2('/images/wwcban.jpg', calign => 'Center', calt => 'Logo');
htp.br;
htp.br;
htp.p('<h4>' || '文件上传' || '</h4>');
htp.hr;
htp.p(htf.bold('文件上传完成。Select * from fnd_lobs flb where flb.file_id = ' ||
l_file_id));
htp.br;
htp.p('<h4>' || '请关闭浏览器！' || '</h4>');
htp.br;
htp.bodyclose;
htp.htmlclose;
ELSE
-- File upload failed.
htp.htmlopen;
htp.headopen;
htp.title('文件上传');
htp.headclose;
htp.bodyopen;
htp.img2('/images/wwcban.jpg', calign => 'Left', calt => 'Logo');
htp.br;
htp.hr;
htp.p(htf.bold('文件上传失败！'));
htp.br;
htp.bodyclose;
htp.htmlclose;
END IF;
END;
PROCEDURE upload_cancel AS
BEGIN
-- Show a message page
htp.htmlopen;
htp.headopen;
htp.title('取消文件上传');
htp.headclose;
htp.bodyopen;
htp.img2('/images/wwcban.jpg', calign => 'Center', calt => 'Logo');
htp.br;
htp.br;
htp.p('<h4>' || '文件上传' || '</h4>');
htp.hr;
htp.p(htf.bold('取消文件上传'));
htp.br;
htp.p('<h4>' || '您已经选择取消文件上传。' || '</h4>');
htp.p('<h4>' || '请关闭浏览器！' || '</h4>');
htp.br;
htp.br;
htp.br;
htp.bodyclose;
htp.htmlclose;
END;
PROCEDURE upload_form(p_access_id IN NUMBER DEFAULT NULL) IS
l_upload_action VARCHAR2(2000);
BEGIN
-- Set the upload action
l_upload_action := fnd_gfm.construct_upload_url(g_agent,
g_upload_url,
p_access_id);
-- Set page title and toolbar.
htp.htmlopen;
htp.headopen;
htp.p('<SCRIPT LANGUAGE="JavaScript">');
htp.p(' function processclick (cancel_url) {
if (confirm(' || '"' || '取消文件上传' || '"' || '))
{
parent.location=cancel_url
}
}');
htp.print('</SCRIPT>');
htp.title('文件上传');
htp.headclose;
htp.bodyopen;
htp.img2('/images/wwcban.jpg', calign => 'Center', calt => 'Logo');
htp.br;
htp.br;
htp.p('<h4>' || '文件上传' || '</h4>');
htp.hr;
htp.br;
htp.print('</LEFT>');
htp.formopen(curl => l_upload_action,
cmethod => 'POST',
cenctype => 'multipart/form-data');
htp.tableopen(cattributes => ' border=0 cellpadding=2 cellspacing=0');
htp.tablerowopen;
htp.tablerowclose;
htp.tablerowopen(cvalign => 'TOP');
htp.p('<TD>');
htp.p('</TD>');
htp.p('<label>文件</label>');
htp.tabledata('<INPUT TYPE="File" NAME="p_file_name" SIZE="60">',
calign => 'left');
htp.tablerowclose;
htp.tableclose;
-- Send access is as a hidden value
htp.formhidden(cname => 'p_access_id', cvalue => to_char(p_access_id));
htp.br;
htp.tableopen(cattributes => ' border=0 cellpadding=2 cellspacing=0');
htp.tablerowopen(cvalign => 'TOP');
htp.tabledata('<INPUT TYPE="Submit" VALUE="' || '确定' ||
'" SIZE="50">',
calign => 'left');
htp.tabledata('<INPUT TYPE="Button" NAME="cancel" VALUE="' || '取消' || '"' ||
' onClick="processclick(''' || g_cancel_url ||
''') " SIZE="50">',
calign => 'left');
htp.tablerowclose;
htp.tableclose;
htp.formclose;
htp.bodyclose;
htp.htmlclose;
END;
PROCEDURE download_file(p_file_id IN NUMBER,
p_access_id IN NUMBER,
p_purge IN VARCHAR2 DEFAULT NULL) IS
BEGIN
fnd_gfm.download(p_file_id, p_access_id, p_purge);
END;
PROCEDURE download_file_html(p_file_id IN NUMBER,
p_access_id IN NUMBER,
p_purge IN VARCHAR2 DEFAULT NULL) IS
BEGIN
htp.print('
<html>
<body>
<img src=' || g_download_url || '?p_file_id=' ||
p_file_id || chr(38) || 'p_access_id=' || p_access_id ||
' border=0>
</body>
</html>
');
END;
END;
/
