Multiple table insert via dblink

Question

Hi,
We have an oracle database which contains a number of tables.
From these tables I need to be able to populate a number of holding tables in a MSSQL database via a nightly scheduled job.
Therefore I will insert into these tables via a procedure from my oracle tables.
I need to ensure that if any of the inserts fail for a particular record I am uploading out of the five insert statements then the whole process is rolled back.
I therefore having something like the following
FOR cursor1_rec IN cursor1_cur LOOP -- This gives me the records I need to insert into the holding table for
BEGIN
INSERT into ms_holding_table_1
(field1, field2)
select 1,2 from oracle_table_1
where id = cursor1_rec.id;
INSERT into ms_holding_table_2
(field1, field2, field3, field4)
select 1,2,3,4 from oracle_table_2
where id = cursor1_rec.id;
INSERT into ms_holding_table_3
(field1)
select 1 from oracle_table_3
where id = cursor1_rec.id;
INSERT into ms_holding_table_4
(field1, field2)
select 1,2 from oracle_table_4
where id = cursor1_rec.id;
END;
END LOOP;
I need to ensure that if the insert for that particular cursor record fails on the 2nd insert statement, the first insert also rollbacks. Likewise if it fails on the 4th insert, I need to ensure that all 4 inserts are rolled back.
If you could provide me with any information as to how to achieve this.
Would issuing a savepoint before the first insert statement and then in my exceptions rolling back to the savepoint before the end of the loop suffice?
Thanks in advance,
ca84

Answer 1

This is anonymous block but you can extend it add more defensive mechanism and def you can make it small procedure or part of some package. Hope this helps
DECLARE
CURSOR cur
IS
SELECT statement
FROM table_name;
BEGIN
INSERT INTO ms_holding_table_1
field1, field2
SELECT 1, 2
FROM oracle_table_1
WHERE id = cursor1_rec.id;
INSERT INTO ms_holding_table_2
field1, field2, field3, field4
SELECT 1, 2, 3, 4
FROM oracle_table_2
WHERE id = cursor1_rec.id;
INSERT INTO ms_holding_table_3 (field1)
SELECT 1
FROM oracle_table_3
WHERE id = cursor1_rec.id;
INSERT INTO ms_holding_table_4
field1, field2
SELECT 1, 2
FROM oracle_table_4
WHERE id = cursor1_rec.id;
COMMIT;
EXCEPTION
WHEN OTHERS
THEN
ROLLBACK;
DBMS_OUTPUT.put_line (SUBSTR (SQLERRM, 1, 200));
RAISE;
END;