The procedure :
CREATE OR REPLACE PROCEDURE createSequence
(
the_seq OUT NUMBER
)
IS
vs_prevyear CHAR(4);
vs_curyear CHAR(4);
vs_curseq NUMBER;
BEGIN
-- get the year of the latest created changelog record
select max(to_char(datecreated,'yyyy')) into vs_prevyear from rtchangelog;
-- get the current year of the database
SELECT TO_CHAR(SYSDATE,'YYYY') INTO vs_curyear FROM DUAL;
-- get the sequence count from the db
SELECT COUNT(*) INTO vs_curseq from seq where sequence_name='SQ_CHANGELOG';
IF(vs_curseq =0) THEN
execute immediate 'create sequence sq_changelog increment by 1 start with 1';
ELSE
IF(vs_prevyear<>vs_curyear) THEN
execute immediate 'drop sequence sq_changelog';
execute immediate 'create sequence sq_changelog increment by 1 start with 1';
END IF;
END IF;
execute immediate 'select sq_changelog.nextval from dual' into the_seq;
commit;
END;
Test sql for toad:
declare
v_num number;
begin
createSequence (v_num) ;
DBMS_OUTPUT.PUT_LINE(v_num);
END;
/
