ORACLE SELECT INTO 防止没结果时报错

如下：

  BEGIN
    SELECT name
      into v_name
      FROM t_student
     WHERE id = '101'
  EXCEPTION
    WHEN NO_DATA_FOUND THEN
      v_name := '';
  END;

这样，就不用提前先select count(1) from t_student where id = ‘101‘;进行判断是否为空了。

上面的捕获异常只会处理没有数据时的错误，如果多于一条的错误，可以再用OTHERS进行捕获

  BEGIN
    SELECT name
      into v_name
      FROM t_student
     WHERE id = '101'
  EXCEPTION
    WHEN NO_DATA_FOUND THEN
      v_name := '';
      WHEN OTHERS THEN
      v_name := '多于一条啦';
  END;