Oracle: Insert only unique records into custom record in compound trigger - database

Question

I am having a compound trigger in the following format. I need to ensure that my custom declaration ints_rows takes only "unique rows". Meaning if the ints_rows already has a record similar to what is being inserted, it should ignore it. More like a SET data structure. How do I do it in oracle? (I am pretty new to oracle, hence I am not great at syntax) I think I have to either change the BULK COLLECT statement or the declaration of int_records but I might be wrong. Any help/hints are much appreciated.
This is my compound trigger code.
CREATE OR REPLACE
TRIGGER MY_COMPOUND_TRIGGER
FOR UPDATE OF some_random_column ON some_random_table
COMPOUND TRIGGER
TYPE int_records IS RECORD (
column_one another_table.column_one%TYPE,
column_two another_table.column_two%TYPE
);
TYPE row_list IS TABLE OF int_records INDEX BY simple_integer;
ints_rows row_list;
BEFORE STATEMENT IS
BEGIN
ints_rows.delete;
END BEFORE STATEMENT;
AFTER EACH ROW IS
BEGIN
SELECT column_one, column_two BULK COLLECT INTO ints_rows
FROM some_table_x WHERE some_col_id=:OLD.some_col_id;
END AFTER EACH ROW;
AFTER STATEMENT IS
BEGIN
FOR i IN 1 .. ints_rows.COUNT LOOP
-- DO SOMETHING
END LOOP;
auctions_rows.delete;
END AFTER STATEMENT;
END;
This statement should not be getting duplicates at all.
SELECT column_one, column_two BULK COLLECT INTO ints_rows
FROM some_table_x WHERE some_col_id=:OLD.some_col_id;

Answer 1

In the AFTER EACH ROW part you overwrite entire ints_rows. In principle it could be this one:
CREATE TABLE SOME_RANDOM_TABLE (some_random_column NUMBER, some_col_id NUMBER);
CREATE TABLE ANOTHER_TABLE (column_one NUMBER, column_two NUMBER);
CREATE TABLE SOME_TABLE_X (some_col_id NUMBER, column_one NUMBER, column_two NUMBER);
CREATE OR REPLACE TYPE int_records AS OBJECT (
column_one NUMBER,
column_two NUMBER,
MAP MEMBER FUNCTION getId RETURN VARCHAR2
);
CREATE OR REPLACE TYPE BODY int_records AS
MAP MEMBER FUNCTION getId RETURN VARCHAR2 IS
BEGIN
RETURN column_one ||','|| column_two;
END getId;
END;
/
CREATE OR REPLACE TYPE row_list IS TABLE OF int_records;
CREATE OR REPLACE TRIGGER MY_COMPOUND_TRIGGER
FOR UPDATE OF some_random_column ON SOME_RANDOM_TABLE
COMPOUND TRIGGER
ints_rows row_list;
BEFORE STATEMENT IS
BEGIN
ints_rows := row_list();
END BEFORE STATEMENT;
AFTER EACH ROW IS
int_row row_list;
BEGIN
SELECT int_records(column_one, column_two)
BULK COLLECT INTO int_row
FROM SOME_TABLE_X x
WHERE x.some_col_id = :OLD.some_col_id;
ints_rows := ints_rows MULTISET UNION DISTINCT int_row;
END AFTER EACH ROW;
AFTER STATEMENT IS
BEGIN
FOR i IN 1 .. ints_rows.COUNT LOOP
NULL;
END LOOP;
END AFTER STATEMENT;
END;
Please test and let us know if it does not work. You may make the records distinct manually with a loop or you need to implement a MAP MEMBER FUNCTION for the RECORD.