simple trigger/procedure problem for oracle apex sql - sql

Question

im trying to run this audit trail trigger in oracle apex sql but i keep getting the same error and i dont know what im doing wrong.
also i need to do this same trigger to every table in my database... is there a way i can do the same thing through a procedure so as to only having to do it once?
create or replace TRIGGER AUDIT_TRAIL_USERS_TRIG
-- starts on every update, insert or delete command
AFTER INSERT OR DELETE OR UPDATE ON USERS
FOR EACH ROW
DECLARE
-- variable which declares if update, delete or insert process
v_trg_action varchar2(10);
BEGIN
IF updating THEN
-- when update
v_trg_action := 'UPDATE';
ELSIF deleting THEN
-- when delete
v_trg_action := 'DELETE';
ELSIF inserting THEN
-- when insert
v_trg_action := 'INSERT';
ELSE
-- if something else
END IF;
IF v_trg_action IN ('DELETE','UPDATE','INSERT') THEN
-- if v_trg_action is DELETE, UPDATE OR INSERT then insert old table values
INSERT INTO AUDIT_TRAIL
( AUDIT_USER, AUDIT_DATE, AUDIT_ACTION)
VALUES
(UPPER(v('APP_USER')), SYSDATE, v_trg_action);
ELSE
END IF;
-- about the insert command on the audit table
-- for current apex user: v('APP_USER')
-- for date: SYSDATE
-- for sql command: v_trg_action
END AUDIT_TRAIL_USERS_TRIG;
the error im getting (im sure i have more than what its saying to me)is as follows:
Compilation failed, line 16 (03:29:53) The line numbers associated with compilation errors are relative to the first BEGIN statement. This only affects the compilation of database triggers.
PLS-00103: Encountered the symbol "END" when expecting one of the following: ( begin case declare exit for goto if loop mod null pragma raise return select update while with << continue close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe purge json_exists json_value json_query json_object json_array Compilation failed, line 25 (03:29:53) The line numbers associated with compilation errors are relative to the first BEGIN statement. This only affects the compilation of database triggers.
PLS-00103: Encountered the symbol "END" when expecting one of the following: ( begin case declare exit for goto if loop mod null pragma raise return select update while with << continue close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe purge json_exists json_value json_query json_object json_array

Answer 1

IF..ELSE blocks cannot be left empty. If you don't need them remove it, I have added a dummy NULL call for the code to compile.Add appropriate logic as desired, otherwise remove the block.
create or replace TRIGGER AUDIT_TRAIL_USERS_TRIG
-- starts on every update, insert or delete command
AFTER INSERT OR DELETE OR UPDATE ON USERS
FOR EACH ROW
DECLARE
-- variable which declares if update, delete or insert process
v_trg_action varchar2(10);
BEGIN
IF updating THEN
-- when update
v_trg_action := 'UPDATE';
ELSIF deleting THEN
-- when delete
v_trg_action := 'DELETE';
ELSIF inserting THEN
-- when insert
v_trg_action := 'INSERT';
ELSE
-- if something else
NULL;
END IF;
IF v_trg_action IN ('DELETE','UPDATE','INSERT') THEN
-- if v_trg_action is DELETE, UPDATE OR INSERT then insert old table values
INSERT INTO AUDIT_TRAIL
( AUDIT_USER, AUDIT_DATE, AUDIT_ACTION)
VALUES
(UPPER(v('APP_USER')), SYSDATE, v_trg_action);
null;
ELSE
NULL;
END IF;
-- about the insert command on the audit table
-- for current apex user: v('APP_USER')
-- for date: SYSDATE
-- for sql command: v_trg_action
END AUDIT_TRAIL_USERS_TRIG;

Answer 2

Use this code, it will work same like yours
create or replace TRIGGER AUDIT_TRAIL_USERS_TRIG
AFTER INSERT OR DELETE OR UPDATE ON USERS
FOR EACH ROW
DECLARE
BEGIN
IF inserting or updating or deleting THEN
INSERT INTO AUDIT_TRAIL
(AUDIT_USER, AUDIT_DATE, AUDIT_ACTION)
VALUES
(UPPER(v('APP_USER')), SYSDATE, v_trg_action);
END IF;
END AUDIT_TRAIL_USERS_TRIG;