Question

我有一个SQL查询，如果输出为NULL，则不应发送警告。

l_sup_id    NUMBER;

begin

SELECT  per_all_assignments_f.supervisor_id
    INTO  l_sup_id
FROM    per_all_assignments_f
WHERE   person_id = p_person_id
    AND     trunc (sysdate) BETWEEN effective_start_date
                    AND     effective_end_date
    AND     primary_flag = 'Y';

elsif (p_person_type = 'APPRAISER' AND  l_sup_id IS NOT NULL) then
        hr_utility.set_message(801, 'HR_51888_APR_APPRAISER_NULL');
        hr_utility.raise_error;
end if;

每当l_sup_id根据逻辑

为空时

  hr_utility.set_message(801, 'HR_51888_APR_APPRAISER_NULL');

不应该执行

但是每当l_sup_id为null我就会得到

ORA-01403：未找到数据

日志中的错误

如果l_sup_id不为null应用程序正常工作

Answer 1

由于错误表明其指向NO DATA的条件，要处理您需要使用＆＃34;异常处理＆＃34;，请参阅代码以了解更改，

declare
l_sup_id    NUMBER;

begin

SELECT  per_all_assignments_f.supervisor_id
    INTO  l_sup_id
FROM    per_all_assignments_f
WHERE   person_id = p_person_id
    AND     trunc (sysdate) BETWEEN effective_start_date
                    AND     effective_end_date
    AND     primary_flag = 'Y';

elsif (p_person_type = 'APPRAISER' AND  l_sup_id IS NOT NULL) then
        hr_utility.set_message(801, 'HR_51888_APR_APPRAISER_NULL');
        hr_utility.raise_error;
end if;
--changes start
exception
when no_Data_found then
dbms_output.put_line('No data exists for lsup '|| l_sup_id)

--changes end
end;

修改

SQL> SELECT * FROM TESTEMP WHERE EMPNO=6677; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ---------- --------- ---------- --------- ---------- ---------- ---------- 6677 JUPITER CLERK 7902 17-DEC-80 800 20 SQL> SQL> declare 2 l_count number; 3 begin 4 select comm into l_count from testemp where empno=6677 ; 5 DBMS_OUTPUT.PUT_LINE('lcount is'||l_count); 6 if (l_count IS NULL) then 7 dbms_output.put_line('no data'); 8 else 9 dbms_output.put_line('data'); 10 end if; 11 end; 12 / lcount is no data PL/SQL procedure successfully completed.

如果你比较NULL或者你想根据你的规范使用它，你的情况将不会进入if

Answer 2

来自文档，

NO_DATA_FOUND

SELECT INTO语句不返回任何行，或者您的程序引用a   嵌套表中的已删除元素或。中的未初始化元素   索引表。

在PL / SQL代码中， SELECT .. INTO 语句不返回任何行，因此会引发 NO_DATA_FOUND 错误。它永远不会进入下一行，即你的IF-ELSE构造。

如果您想继续操作，则需要优雅地处理 EXCEPTION 。

例如，

SQL> SET serveroutput ON
SQL>
SQL> DECLARE
  2    o_ename emp.ename%TYPE;
  3    i_empno emp.empno%TYPE;
  4  BEGIN
  5    SELECT ename INTO o_ename FROM emp WHERE empno = i_empno;
  6    -- Handle no_data_found
  7  EXCEPTION
  8  WHEN no_data_found THEN
  9    -- do something
 10    dbms_output.put_line('No records found for employee no '|| i_empno);
 11  END;
 12  /
No records found for employee no

PL/SQL procedure successfully completed.

SQL>

Answer 3

感谢您的所有回复。我没有使用普通的sql创建了以下游标

cursor csr_supervisor_id 
                    is
        SELECT  supervisor_id
        FROM    per_all_assignments_f
        WHERE   person_id = p_person_id
            AND     trunc (sysdate) BETWEEN effective_start_date
                    AND     effective_end_date
            AND     primary_flag = 'Y';

并在l_sup_id

中获取它

open csr_supervisor_id;
fetch csr_supervisor_id into l_sup_id;

现在没有收到数据错误。

ORA-01403：未找到任何数据

3 个答案: