Output new and old value in a before update trigger : NEW OLD « Trigger « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Trigger » NEW OLD 
28. 3. 9. Output new and old value in a before update trigger
SQL>
SQL> create table t x int, y int );

Table created.

SQL>
SQL> insert into t values 1);

row created.

SQL>
SQL> create or replace trigger t_bufer
  2  before update on t for each row
  3  begin
  4          dbms_output.put_line'old.x = ' || :old.x ||', old.y = ' || :old.y );
  5          dbms_output.put_line'new.x = ' || :new.x ||', new.y = ' || :new.y );
  6  end;
  7  /

Trigger created.

SQL> set serveroutput on
SQL> update t set x = x+1;
old.x = 1, old.y = 1
new.x = 2new.y = 1

row updated.

SQL>
SQL> drop table t;

Table dropped.

SQL>
28. 3. NEW OLD
28. 3. 1. Old and new value
28. 3. 2. Reference new value with :NEW in a before insert or update trigger
28. 3. 3. Refernece an old value in :OLD after update trigger
28. 3. 4. :old and :new Pseudo-records, Example 1
28. 3. 5. :old and :new Pseudo-records, Example 2
28. 3. 6. Raise application error in a trigger in case of invalid new value
28. 3. 7. REFERENCING OLD AS old NEW AS new
28. 3. 8. REFERENCING OLD AS old_values NEW AS new_values
28. 3. 9. Output new and old value in a before update trigger
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