Question

ACCEPT p_1 PROMPT 'Please enter the last name:'
DECLARE
v_last_name VARCHAR2(20) := '&p_1';
v_Hire_date person.hire_date%TYPE;
v_Job_type person.job_type%TYPE;
v_Job_status person.Job_status%TYPE;
v_pilot_type pilot.pilot_type%TYPE;
v_n number;
BEGIN
select count(*) into v_n from person
where UPPER(last_name) = v_last_name;
IF v_n != 1 THEN
DBMS_OUTPUT.PUT_LINE(TO_CHAR(v_last_name) || ' is not in the table. ');
--ELSE 
select UPPER(e.last_name),e.hire_date,e.job_type,e.job_status,
p.pilot_type into v_last_name,v_hire_date,v_Job_type,v_Job_status,v_pilot_type
from person e JOIN pilot p
ON (e.person_id = p.person_id)
order by last_name;
DBMS_OUTPUT.PUT_LINE(RPAD('last_name',10) || RPAD('hire_date',10) ||
RPAD('Job_type', 30) || RPAD('Job_status',10) || RPAD('pilot_type', 20));
ELSE
   DBMS_OUTPUT.PUT_LINE('No output!');
END IF;
END;

我已编写此代码以显示员工信息。问题出在IF条件下。它没有显示结果。

结果：如果我将用户输入的姓氏输入为棕色，则仅显示如下

棕色不在表中。

Answer 1

“如果我输入用户输入的姓氏为棕色”

你的问题有点含糊不清，但如果你实际上是用小写字母输入名字（字面意思是 brown ）那么这个问题很容易诊断出来：

您的WHERE子句将列值强制转换为大写但不是输入：

where UPPER(last_name) = v_last_name

这转换为upper('brown') = 'brown', which will never be true,because'BROWN'＆lt;＆gt; “brown'`。

因此，要么选择完全匹配，要么将案例转换应用于双方：

where UPPER(last_name) = upper(v_last_name)

或者，也许你有不止一个叫布朗的人？这也会显示没有记录的消息，这是错误的。

Answer 2

SET SERVEROUTPUT ON;

ACCEPT p_1 PROMPT 'Please enter the last name:'
DECLARE
  v_last_name  person.last_name%TYPE := UPPER( '&&p_1' );
  v_Hire_date  person.hire_date%TYPE;
  v_Job_type   person.job_type%TYPE;
  v_Job_status person.Job_status%TYPE;
  v_pilot_type pilot.pilot_type%TYPE;
BEGIN
  select e.hire_date,
         e.job_type,
         e.job_status,
         p.pilot_type
  into   v_hire_date,
         v_Job_type,
         v_Job_status,
         v_pilot_type
  from   person e
         JOIN pilot p
         ON (e.person_id = p.person_id)
  WHERE  UPPER( e.last_name ) = v_last_name;

  DBMS_OUTPUT.PUT_LINE(
    RPAD(v_last_name,10)
    || RPAD(v_hire_date,10)
    || RPAD(v_Job_type, 30)
    || RPAD(v_Job_status,10)
    || RPAD(v_pilot_type, 20)
  );
EXCEPTION
  WHEN NO_DATA_FOUND THEN
    DBMS_OUTPUT.PUT_LINE( v_last_name || ' is not in the table. ');
  WHEN TOO_MANY_ROWS THEN
   DBMS_OUTPUT.PUT_LINE( 'No output!' );
END;
/

pl / sql块显示员工信息

2 个答案: