is there a way to impose the use of sequences

is there a way to stop someone to insert an id without using the sequence?
CREATE SEQUENCE id_seq
   START WITH 1;

CREATE TABLE test_table (id_seq NUMBER (4) PRIMARY KEY);



INSERT INTO test_table
     VALUES (id_seq.NEXTVAL);

INSERT INTO test_table
     VALUES (2);

INSERT INTO test_table
     VALUES (id_seq.NEXTVAL);
gives us
ORA-00001: unique constraint (DSAMSTRC. SYS_C0091648) violated
as it should be

However is it a check constraint of some ilk who made sure the user uses the sequence during inserts?
then the second insert
INSERT INTO test_table
     VALUES (2);
gives me a sort of violation of check constraint that I do not use the id_seq. NEXTVAL?

Allows you to encode the audit in a trigger

SQL> ed
Wrote file afiedt.buf

  1  create trigger trg_test_table
  2    before insert on test_table
  3    for each row
  4  declare
  5    l_currval integer;
  6  begin
  7    select id_seq.currval
  8      into l_currval
  9      from dual;
 10    if( l_currval != :new.id_seq )
 11    then
 12      raise_application_error( -20001, 'Hey!  Use the sequence' );
 13    end if;
 14* end;
 15  /

Trigger created.

SQL> INSERT INTO test_table
  2       VALUES (id_seq.NEXTVAL);

1 row created.

SQL> INSERT INTO test_table
  2       VALUES (id_seq.NEXTVAL);

1 row created.

SQL> INSERT INTO test_table
  2       VALUES (25);
INSERT INTO test_table
            *
ERROR at line 1:
ORA-20001: Hey!  Use the sequence
ORA-06512: at "SCOTT.TRG_TEST_TABLE", line 9
ORA-04088: error during execution of trigger 'SCOTT.TRG_TEST_TABLE'

But at this point, you're probably better just to have the trigger complete the sequence column ignoring all that was passed in.

Justin

Tags: Database

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