Lagret procedure for sletning af poster i Oracle DBMS

Her er et eksempel på en kode til at slette data fra en overordnet tabel overlappende til alle underordnede tabeller ved hjælp af database_dictionary, jeg havde det meget sjovt med at skrive det;-)Bemærk den sidste linje sletning fra person hvor pk ='38B567E2909447868ABDDF500B78F2A3'; let kan generaliseres. En anden ting at tilføje, dette script virker ikke, hvis du har primære begrænsninger på to kolonner eller mere...

declare 
  TYPE cur_typ IS REF CURSOR;
  procedure delete_from_sub_table_first(p_current_table_name varchar2, l_parent_key_value varchar2) is
     c cur_typ;
     child_table_pm_key_value varchar2(255);
  begin
    for childConsRecord in (select ac.table_name child_table, acc.column_name Child_column, rac.table_name, racc.COLUMN_NAME, (select column_name from ALL_CONS_COLUMNS accpm, all_constraints acpm where accpm.constraint_name = acpm.constraint_name and acpm.CONSTRAINT_TYPE = 'P' and ac.TABLE_NAME = acpm.TABLE_NAME) child_table_pm_key
                  from ALL_CONS_COLUMNS acc, all_constraints ac, ALL_CONS_COLUMNS racc, all_constraints rac
                  where acc.CONSTRAINT_NAME = ac.CONSTRAINT_NAME
                  and ac.CONSTRAINT_TYPE = 'R'
                  and racc.CONSTRAINT_NAME  = rac.CONSTRAINT_NAME
                  and rac.constraint_name = ac.R_CONSTRAINT_NAME
                  and rac.table_name = p_current_table_name) loop
      OPEN c FOR 'select ' || childConsRecord.child_table_pm_key || ' child_value FROM ' || childConsRecord.child_table || ' where ' || childConsRecord.Child_column || ' = :1' using l_parent_key_value;
      LOOP
          FETCH c INTO child_table_pm_key_value;
          EXIT WHEN c%NOTFOUND;
          -- process row here
          delete_from_sub_table_first(childConsRecord.child_table, child_table_pm_key_value);
      END LOOP;
      close c;
      EXECUTE IMMEDIATE 'DELETE FROM ' || childConsRecord.child_table || ' where ' || childConsRecord.Child_column || ' = :1' using l_parent_key_value;        
    end loop;
  end;
begin  
  delete_from_sub_table_first('PERSON', '38B567E2909447868ABDDF500B78F2A3');
  delete from person where pk = '38B567E2909447868ABDDF500B78F2A3';
end;
/