Copying records

Dear all,

I have problem i have table name "WO" in oracle db i want
"Whenever I start my program, I want it it look at all the works orders, and if any works order has a date that is exactly one month before today's date, then I want the program to display a message and create copies of those works orders with a schedule date of today's date and save it".

how to achieve this please provide me code

Thanks in advance.

Here is the structure of my database

DISCRIPTION VARCHAR2(200)
REQ_DATE DATE
WO_T VARCHAR2(30)
TASK_PER VARCHAR2(50)
ORIGINATOR VARCHAR2(70)
REQ_DEPT VARCHAR2(70)
EXTENSION NUMBER(10)
CRAFT VARCHAR2(50)
TASK_ASSG_TO VARCHAR2(70)
SCHEDULED_DATE DATE
SCHEDULED_FINISH_DATE DATE
COMPLETION_DATE DATE
ESTIMATED_HRS NUMBER(10)
REQ_TYPE VARCHAR2(50)
PRIORITY NUMBER(2)
ITEM_CODE NUMBER(30)
LOCATION VARCHAR2(70)
SUB_LOC VARCHAR2(70)
ADDED_DATE DATE
QTY NUMBER(30)
DONE_BY VARCHAR2(70)
EMP_ID NUMBER(20)
COMP_DU VARCHAR2(20)
COMMENTS VARCHAR2(2000)
PREP_BY VARCHAR2(50)
WO_USER VARCHAR2(30)
WO_NO NUMBER(25)
ITEM_NAME VARCHAR2(100)

Please also view the attached project file by following the given link

http://www.4shared.com/file/p6ikkUDw/ITPCHR1.html