oracle触发器--if else demo

CREATE OR REPLACE Trigger trig_solr_index_el_lesson
  After Update of lessonid, lessonname, lessongoal, note, teachername, teacherid, classidname, classid, crtime, status Or Delete or insert On el_lesson
  For Each Row
declare
  -- local variables here
  new_status number;
begin
  new_status := :NEW.status;
  if inserting then
    begin
      INSERT INTO solr_index
        (id, docid, type)
      VALUES
        (solr_index_seq.NEXTVAL, :NEW.lessonid, 'add');
    end;
  end if;

  if updating then
  --对比老的状态和新的状态
    if new_status = -1 and :OLD.status != -1 then
    
      INSERT INTO solr_index
        (id, docid, type)
      VALUES
        (solr_index_seq.NEXTVAL, :OLD.lessonid, 'delete');
    
    else
      INSERT INTO solr_index
        (id, docid, type)
      VALUES
        (solr_index_seq.NEXTVAL, :OLD.lessonid, 'update');
    
    end if;
  end if;

  if deleting then
    begin
      INSERT INTO solr_index
        (id, docid, type)
      VALUES
        (solr_index_seq.NEXTVAL, :OLD.lessonid, 'delete');
    end;
  end if;
end;