FNDWRR.exe后面的temp_id是如何生成的--解析Oracle EBS request log/output的url
我们在EBS的view concurrent request 界面里, 通常会点击log或output, 然后在菜单里选copy file,从IE里来获取相应的log或output文件. 相应的url是
http://host:port/OA_CGI/FNDWRR.exe?temp_id=2391709&login=APPLSYSPUT/PUB@VIS
这个url是如何生成的呢? 通过查看FNDRSRUN这个form, 查到相关的两个package是fnd_webfile.get_url和fnd_concurrent_file.get_file_id
以下是fnd_webfile.get_url的参数说明
/* Function: GET_URL
*
* Purpose: Constructs and returns the URL for a Concurrent Processing
* log or output file.
*
* Arguments:
* file_type - Specifies the type of file desired:
* fnd_webfile.process_log = The log of the concurrent process identified
* by the parameter ID.
* fnd_webfile.icm_log = The log of the ICM process identified by ID.
* Or, the log of the ICM process that spawned
* the concurrent process identified by ID.
* Or, the log of the most recent ICM process
* if ID is null.
* fnd_webfile.request_log = The log of the request identified by ID.
* fnd_webfile.request_out = The output of the request identified by ID.
* fnd_webfile.request_mgr = The log of the concurrent process that ran
* the request identified by ID.
* fnd_webfile.frd_log = The log of the forms process identified
* by ID.
* fnd_webfile.generic_log = The log file identified by ID.
* fnd_webfile.generic_trc = The trace file identified by ID.
* fnd_webfile.generic_ora = The ora file identified by ID.
* fnd_webfile.generic_cfg = The config file identified by ID.
* fnd_webfile.context_file= The context file identified by ID.
* fnd_webfile.generic_text= Generic file using text transfer mode.
* fnd_webfile.generic_binary = Generic file using binary transfer mode.
*
* id - A concurrent process ID, concurrent request ID, or file ID
* depending on the file type specified.
* For fnd_webfile.context_file,fnd_webfile.generic_text,
* fnd_webfile.generic_binary this value is null.
*
* gwyuid - The value of the environment variable GWYUID used in
* constructing the URL.
*
* two_task - The database two_task, used in constructing the URL.
*
* expire_time - The number of minutes for which this URL will remain
* valid.
* source_file - Source file name with full patch
*
* source_node - Source node name.
*
* dest_file - Destination file name
*
* dest_node - Destination node name
*
* Returns NULL on error. Check the FND message stack.
在这个get_url中, 如果文件是request_log或request_out类型的, 它会调用fnd_concurrent_file.get_file_id, 以下是源代码
function get_file_id return varchar2
is
fuid number;
fcrc number;
frand number;
fid number;
rval varchar2(32);
rtemp varchar2(32);
begin
select fnd_s_file_temp_id.nextval
into fuid
from dual;
-- Get a random number
fnd_random_pkg.init(7);
fnd_random_pkg.seed(to_number(to_char(sysdate, 'JSSSSS')), 10, false);
frand := fnd_random_pkg.get_next;
-- Compute CRC32 of the random number and the sequence number,
-- this creates a self-checking value.
rval := lpad(to_char(frand),10,'0')||lpad(to_char(fuid),10,'0');
fcrc := fnd_hash_pkg.crc32(rval);
-- XOR the sequence and random values with whatever we have
-- lying around. This make our algorithm more obscure,
-- since sequence values and pseudorandom numbers are no longer
-- obvious to an observer.
fuid := fnd_hash_pkg.xor32(fuid, frand);
frand := fnd_hash_pkg.xor32(fcrc, frand);
-- this value will be unique
fid := fcrc * power(2,64) + frand * power(2,32) + fuid;
-- base 64
rval := fnd_code_pkg.base64(fid, 16);
rtemp := rval;
-- and finally encrypt it all with RC4...actually we now use CRC Hash
-- rval := fnd_crypt_pkg.encrypt('4237533241', rval, 16);
rval := to_char(icx_call.CRCHASH('4237533241',rval));
return rval;
end get_file_id;
其中可见oracle几个有趣的package, 如:
fnd_crypt_pkg
fnd_code_pkg
fnd_random_pkg
fnd_hash_pkg
icx_call
有空再研究一下这几个package.