Forms :: Data Upload Using SQL Loader

Iam working with a form thru which I need to port nearly 7 laks of data into table. Earlier I had created a form thru which I read the data from the text file and inserting into the table. This was taking lot of time and as well after an hour or so, after porting 50k rows the program got terminated and shows an error like Network Inturpted.

So I have decided to use some other option and found that I can use either SQL Loader or external Tables. I had choosed SQL loader option and created a form along with a control file and batch file based on some forum posting.

Control File

LOAD DATA
INFILE 'D:SethuPayClock DumpCLK_050611clock_dump.txt'
INTO TABLE ARS_CLOCK_DUMP
(TDATE POSITION(01:08) DATE 'YYYYMMDD',
VER POSITION(09:10) CHAR,
EMPNO POSITION(11:15) CHAR,
TTIME POSITION(16:19) CHAR,
BRADD POSITION(21:22) CHAR
)
[code]....

With above all the form works perfectly in local system which is the development evironment and also client PC. And I was able to port those 7 laks rows in 3 miniutes. Now the real problem, If I need to move this to live application server, I had to move three files [ FMB, CTL and BAT ]. I have some problems in moving the other two files to the application server [ waiting for approval from bozz ]. And more over, I had to hard code the user id and password in the BAT file, i think which may not be a best practice and also not safe.

So I have decieded to do all from forms and found same sort of script. I took it and modified to my needs.Code from form's when button pressed which is not working

declare
usid varchar2(10):= get_application_property(username);
pwd varchar2(10):= get_application_property(password);
db varchar2(10):= get_application_property(connect_string);
msqlldr varchar2(300);
ctrl_filename varchar (300) := 'D:SethuPayModifiedFormsars_clock_dump.ctl';
data_filename varchar2(300) := 'D:oracleproduct10.2.0db_1BINabc.dat';
fname varchar2(1000);
[code]....