create pl/sql trigger insert squence on all tables - oracle

Question

i want to create a trigger insert sequence i created to apply on all primary key on tables ,
CREATE SEQUENCE HR.PRIMARY_KEY
START WITH 300
INCREMENT BY 10
MAXVALUE 99990
MINVALUE 1
NOCYCLE
NOCACHE
NOORDER;
create or replace trigger increment_pk_trigger
before insert
ON schema
--FOR EACH ROW
DECLARE
CURSOR get_pk_CURSOR IS
select a.constraint_name, b.column_name, a.table_name
from user_constraints a, user_cons_columns b
where a.constraint_type = 'P' and a.constraint_name = b.constraint_name;
BEGIN
FOR V_RECORD IN get_pk_CURSOR LOOP
EXECUTE IMMEDIATE 'insert into '||V_RECORD.TABLE_NAME||' :new.V_RECORD.column_name := primary_key.nextva ';
END LOOP;
END;
my problem i cannot get what will table_name will be i tried to make it on database|schema
but not work

Answer 1

This is not a requirement that makes sense so you realistically can't.
It would be very weird to have a single sequence as the source for the primary key on every table-- there would end up being quite a bit of contention on that single sequence. It would be much more normal to create one sequence per table or (assuming a recent version of Oracle) to simply declare the primary key as an identity column.
If you really wanted to, you could write some code that dynamically generated triggers for every table in the schema. Something like this (assuming that every table has a single column primary key and that you really want to use the same sequence to generate the primary key on every table despite the performance impact)
begin
for pk in (select a.constraint_name, b.column_name, a.table_name
from user_constraints a, user_cons_columns b
where a.constraint_type = 'P'
and a.constraint_name = b.constraint_name)
loop
execute immediate 'create or replace trigger trg_pk_' || pk.table_name ||
' before insert on ' || pk.table_name ||
' for each row ' ||
'begin ' ||
' :new.' || pk.column_name || ' := primary_key.nextval; ' ||
'end; ';
end loop
end;