Trap Insert error for update

Question

Hi, I've to insert/update records in pretty large table, and require an efficient way to do this. The majority of actions will be inserts, although there will be updates. How can I trap an insert constraint error and then do an update instead. Also, is this the most efficient way to do this??
C.

Answer 1

You can do something like this:
sql >> CREATE TABLE tbl_numbers
2 (
3 num number ,
4 description varchar2(20) ,
5 error varchar2(3) default 'NO'
6 )
7 tablespace index_4m
8 /
Table created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 1 , 'One' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 2 , 'Two' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 3 , 'Three' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 4 , 'Four' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 5 , 'Five' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 6 , 'Six' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 7 , 'Seven' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 8 , 'Eight' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 9 , 'Nine' )
4 /
1 row created.
sql >> insert into tbl_numbers
2 ( num , description )
3 values ( 10 , 'Ten' )
4 /
1 row created.
sql >> commit
2 /
Commit complete.
PROCEDURE PR_INSERT_UPDATE
IS
TYPE array_n IS TABLE OF NUMBER ;
TYPE array_v IS TABLE OF VARCHAR2(20) ;
t_num array_n ;
t_description array_v ;
e_ForallError EXCEPTION ;
PRAGMA EXCEPTION_INIT ( e_ForallError , -24381 ) ;
CURSOR cur IS
SELECT num , description
FROM tbl_numbers ;
BEGIN
OPEN cur ;
LOOP
FETCH cur BULK COLLECT INTO t_num , t_description LIMIT 100 ;
BEGIN
FORALL i IN t_num.FIRST .. t_num.LAST SAVE EXCEPTIONS
INSERT INTO tbl_numbers
( num , description )
VALUES ( t_num(i) , t_description(i)||'----------------' ) ;
COMMIT ;
EXCEPTION
WHEN e_ForallError THEN
t_num.DELETE ;
FOR i IN 1 .. SQL%BULK_EXCEPTIONS.COUNT LOOP
t_num.EXTEND ;
t_num(t_num.COUNT) := SQL%BULK_EXCEPTIONS(i).ERROR_INDEX ;
END LOOP ;
FORALL i IN 1 .. t_num.COUNT
UPDATE tbl_numbers
SET error = 'YES'
WHERE num = t_num(i) ;
COMMIT ;
END ;
EXIT WHEN cur%NOTFOUND ;
END LOOP ;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Error Code: '||SQLCODE) ;
dbms_output.put_line('Error Desc: '||SUBSTR(SQLERRM,1,200)) ;
RAISE ;
END PR_INSERT_UPDATE ;
sql >> select * from tbl_numbers;
NUM DESCRIPTION ERR
1 One NO
2 Two NO
3 Three NO
4 Four NO
5 Five NO
6 Six NO
7 Seven NO
8 Eight NO
9 Nine NO
10 Ten NO
10 rows selected.
sql >> exec PR_INSERT_UPDATE
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
sql >> select * from tbl_numbers;
NUM DESCRIPTION ERR
1 One NO
2 Two NO
3 Three YES
4 Four NO
5 Five NO
6 Six NO
7 Seven YES
8 Eight YES
9 Nine NO
10 Ten NO
1 One---------------- NO
2 Two---------------- NO
4 Four---------------- NO
5 Five---------------- NO
6 Six---------------- NO
9 Nine---------------- NO
10 Ten---------------- NO
17 rows selected.