echo OPTIONS ( ERRORS=10000000) > abc.ctl
echo load data >> abc.ctl
remark - the below lines read all txt file in directory and passes there name to abc.ctl control file.
for /f %%a IN ('dir /b D:\a\*.txt') do echo INFILE  'D:\a\%%a'  >>abc.ctl
echo 
echo append INTO TABLE tablename>>abc.ctl
echo fields terminated by '+' >>abc.ctl
echo ( >>abc.ctl
feild1,field2,field3) >>flat.ctl
sqlldr userid = USERNAME/PWD@DBNAME
control=abc.ctl