Last identity \ sequence value

Question

Hello,
I have a little problem in some code I have written.
I have a database trigger that sequences rows for me on a transaction being entered into the database table.
However, as the return value of the procedure I have written I want this value to be returned.
How do I get the PK (eg sequence number) of the last record that was placed into the database table.
I am guessing that there is some form of sequence.last construct but I can't help being concerned by concurency issues (eg will the last sequence value always be the sequence that my trigger used)
Any advice will be gratefully recieved.
Regards

Answer 1

You'll have to figure out the details, but this is why Larry gave us the RETURNING clause.
SQL> CREATE TABLE apc1 (pk1 NUMBER, col1 NUMBER);
Table created.
SQL> CREATE SEQUENCE apc_pk;
Sequence created.
SQL> CREATE TRIGGER apc_bir BEFORE INSERT ON apc1 FOR EACH ROW
  2  BEGIN
  3     SELECT apc_pk.NEXTVAL INTO :NEW.pk1
  4     FROM   dual;
  5  END;
  6  /
Trigger created.
SQL> var x NUMBER
SQL> BEGIN
  2     INSERT INTO apc1 (col1)
  3     VALUES (32)
  4     RETURNING pk1 INTO :x;
  5  END;
  6  /
PL/SQL procedure successfully completed.
SQL> print x
         X
         1
SQL> SELECT * FROM apc1;
       PK1       COL1
         1         32
SQL> Cheers, APC