Oracle DB insert and do nothing on duplicate key

问题

I have to insert some data in oracle DB, without previously checking if it already exist.

Does exist any way, transiction on oracle to catch the exception inside the query and handle it to don't return any exception?

It would be perfect something in mysql's style like

insert .... on duplicate key a=a

回答1:

You can use MERGE. The syntax is a bit different from a regular insert though;

MERGE INTO test USING (
  SELECT 1 AS id, 'Test#1' AS value FROM DUAL    -- your row to insert here
) t ON (test.id = t.id)                          -- duplicate check
WHEN NOT MATCHED THEN 
   INSERT (id, value) VALUES (t.id, t.value);    -- insert if no duplicate

An SQLfiddle to test with.

回答2:

If you can use PL/SQL, and you have a unique index on the columns where you don't want any duplicates, then you can catch the exception and ignore it:

begin
   insert into your_table (your_col) values (your_value);
exception
   when dup_val_on_index then null;
end;

来源：https://stackoverflow.com/questions/17946595/oracle-db-insert-and-do-nothing-on-duplicate-key