set feedback off;
set pagesize 0;
set heading off;
set verify off;
set linesize 200;
set trimspool on;
spool c:\数据库备份.bat;

select ''exp username/ffffff@yourdb 
tables=''||table_name||'' file=''||table_name||''.dmp 
triggers=n'' from user_tables;

spool off;
set feedback on;
set pagesize 9999;
set heading on;
set verify on;

exit