How good my trigger & Create Sequence are written review my excerpt from PL/SQL

I have a CustomerHistory table.

Here's a sequence I created for the table:

CREATE SEQUENCE customerhistory_id_seq
START WITH 90
INCREMENT BY 10
MAXVALUE 90000
NOCYCLE
NOCACHE;

I created a trigger example the primary key of the history table:

CREATE OR REPLACE TRIGGER cushistory_bef_insert
BEFORE INSERT ON CustomerHistory
FOR EACH ROW
BEGIN
      SELECT customerhistory_id_seq.NEXTVAL INTO :NEW.CustomerHistoryID
      FROM DUAL;
END;
/

After each update, or delete, insert the old record in the history table:

CREATE OR REPLACE TRIGGER cushistory_aft_upddel
AFTER UPDATE OR DELETE ON CUSTOMER
FOR EACH ROW
BEGIN
      IF UPDATING THEN
            INSERT INTO CustomerHistory
                     *
            (
                 SELECT
                         :OLD.c.customerID,
                         :OLD.c.firstname,
                       :OLD.c.lastname,
                       :OLD.c.email,
                         .
                         .
                         .
                         :OLD.mr.roomtype,
                         .
                         .
                         .
                         :OLD.b.checkout,
                         'UPDATE',
                         SYSDATE
               FROM Customer c JOIN CustomerFamilyMember cf ON c.customerID = cf.customerID
                     JOIN Phone p ON c.customerID = p.customerID
                     JOIN ThirdParty t ON c.thirdpartyid = t.thirdpartyID
                     JOIN BookedRoom b ON c.customerID = b.CustomerID
                     JOIN MotelRoom mr ON b.roomID = mr.roomID
                     JOIN Motel m ON mr.motelID = m.motelID
          );
     
      ELSIF DELETING THEN
      
            INSERT INTO CustomerHistory
                     *
            (
                 SELECT
                         :OLD.c.customerID,
                         :OLD.c.firstname,
                       :OLD.c.lastname,
                       :OLD.c.email,
                         .
                         .
                         .
                         :OLD.mr.roomtype,
                         .
                         .
                         .
                         :OLD.b.checkout,
                         'DELETE',
                         SYSDATE
               FROM Customer c JOIN CustomerFamilyMember cf ON c.customerID = cf.customerID
                     JOIN Phone p ON c.customerID = p.customerID
                     JOIN ThirdParty t ON c.thirdpartyid = t.thirdpartyID
                     JOIN BookedRoom b ON c.customerID = b.CustomerID
                     JOIN MotelRoom mr ON b.roomID = mr.roomID
                     JOIN Motel m ON mr.motelID = m.motelID
          );
     
      END IF;
END;
/

1 are structured correctly 3 pl/sql code snippets?
2. in the last example, which is an alternative using the JOIN? If know join 5 tables is not a good
long term solution. Any idea?

Hello

Here are the bugs I find in your code.
Please view the description of test table and features for more information.

1 cushistory_aft_upddel is a level trigger line on client.
Querying the table inside the trigger would give the error table mutation.

ERROR at line 1:
ORA-04091: table XXXXX.CUSTOMER is mutating, trigger/function may not see it
ORA-06512: at "XXXXX.TEST_TRG", line 2
ORA-04088: error during execution of trigger 'XXXXX.TEST_TRG'

The only way you can acccess them using: old.col_name and: new.col_name.

2 table the customer is the only updated and so the new and the old mke sense only for the customer table. the old.b.col_name and old. XXX.col_name for all other tables mean nothing and will result in error;

Here is an excerpt of small test with tahe customer table and another table called check_in. You can extend the same thing for your problem.

sql> create table customer(
  2    cust_id number,
  3    cust_name varchar2(20));

Table created.

sql> create table check_in(
  2    cust_id number,
  3    check_in date,
  4    check_out date
  5  );

Table created.

sql> create table cust_history(
  2    cust_id number,
  3    cust_name varchar2(20),
  4    check_in  date,
  5    check_out date);

sql> insert into customer values (100, 'Rajesh');

1 row created.

sql> insert into customer values (200, 'kumar');

1 row created.

sql> insert into check_in values (100, sysdate-2, null);

1 row created.

sql> insert into check_in values (200, sysdate-3, null);

1 row created.

sql> commit;

Commit complete.

 create or replace trigger test_trg
 after update on customer for each row
 begin
   insert into cust_history
   select :old.cust_id,
          :old.cust_name,
          ci.check_in,
          ci.check_out
     from check_in ci
     where ci.cust_id = :old.cust_id;
 end;
 /

sql> select * from customer;

   CUST_ID CUST_NAME
---------- --------------------
       100 Rajesh
       200 kumar

sql> select * from check_in;

   CUST_ID CHECK_IN  CHECK_OUT
---------- --------- ---------
       100 25-DEC-09
       200 24-DEC-09

sql> select * from cust_history;

no rows selected

sql> update customer set cust_name = 'Rajesh2' where cust_id = 100;

1 row updated.

sql> commit;

Commit complete.

sql> select * from customer;

   CUST_ID CUST_NAME
---------- --------------------
       100 Rajesh2
       200 kumar

sql> select * from cust_history;

   CUST_ID CUST_NAME            CHECK_IN  CHECK_OUT
---------- -------------------- --------- ---------
       100 Rajesh               25-DEC-09

You can use the other tables to select as I used the check_in above. You don't need to access the customer table that you have values in the: old. and: new. variables for them.

Thank you
Rajesh.

Published by: Rajesh Chamarthi on December 26, 2009 21:30 added example.

Tags: Database

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Denes Kubicek
-------------------------------------------------------------------
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-------------------------------------------------------------------

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