过程 PLSQL 中的查询必须返回 1 行,但返回更多行

发布于 2024-10-11 23:11:40 字数 1811 浏览 3 评论 0原文


我在实现 pl/sql 过程时遇到一个奇怪的问题。
我的程序有四个 varchar 输入参数,并使用如下查询从表中提取 id 值:

SELECT ID INTO idvar FROM TABLE T WHERE T.NAME = pn AND T.SUR = ln;

在此表中,name 和 sur 是唯一键。因此,对于几个输入参数(pn,ln),我期望只获得一行,但事实并非如此。 事实上,似乎只有第一个条件得到了处理,而第二个条件没有得到处理。

在我的表中,有这个测试行:

ID | NAME | SUR
1  | JO   | SOME THING
2  | JO   | OTHER ONE
3  | BO   | SOME THING

如果在我的程序中通过,

('JO', 'SOME THING')

我将获得 ID:1 和 2。
但是,如果我传递值,

('BO', 'SOME THING')

我仅获得 ID 3。

显然,通过之前的查询,我获得了错误 ORA-01422,因此我首先用游标定义替换它,然后用“for row in (query)”替换它:

CURSOR C IS
SELECT ID FROM TABLE T WHERE T.NAME = pn AND T.SUR = ln;

这种行为对于我,事实上,如果我只执行来自 sqlplus 或 toad 的查询,我会得到正确的结果。

Oracle版本是8.1。

预先感谢

#

这是我的程序(我希望你不会发现不匹配,因为我更改了对象名称):

CREATE OR REPLACE PROCEDURE myproc (
pn in VARCHAR2,
ln in VARCHAR2,
other in VARCHAR2,
datarif in VARCHAR2
) 
AS
  idT    NUMBER;
  idST NUMBER;
  idSE    NUMBER;

  CURSOR C IS 
    SELECT ID
    FROM TABLE T
    WHERE 
    T.NAME = pn AND T.SUR = ln;

BEGIN

     for x in ( SELECT ID
         FROM TABLE T
        WHERE 
        T.NAME = pn AND T.SUR = ln )
     loop 
       DBMS_OUTPUT.put_line('INFOR:' || x.ID);
     end loop;


     open C;
     loop
       fetch C into idT;
        exit when C%NOTFOUND;
        DBMS_OUTPUT.put_line('INLOOP:ID='||idT);
 end loop;
 close C;

 DBMS_OUTPUT.put_line ( 'OUTLOOP: ID='||idT );


  EXCEPTION
    WHEN NO_DATA_FOUND THEN
     NULL;
    WHEN TOO_MANY_ROWS THEN 
      RAISE_APPLICATION_ERROR(-20001, 'Exact Fetch Returned many Rows');  
    WHEN OTHERS THEN
     DBMS_OUTPUT.put_line('ERROR');
     ROLLBACK;
 RAISE;

END myproc;
/

谢谢

I have a strange problem implementing pl/sql procedure.
My procedure has four varchar input parameter, and extracts from a table an id value with a query like this:

SELECT ID INTO idvar FROM TABLE T WHERE T.NAME = pn AND T.SUR = ln;

In this table, name and sur are unique key. So for a couple of input parameter (pn,ln), I expect to obtain only one row, but isn't so.
Indeed, it seems that only the first condition processed, and the second doesn't.

In my table I have, this test row:

ID | NAME | SUR
1  | JO   | SOME THING
2  | JO   | OTHER ONE
3  | BO   | SOME THING

If in my procedure I pass

('JO', 'SOME THING')

I obtain ID: 1 and 2.
But if I pass values

('BO', 'SOME THING')

i obtain only ID 3.

Clearly, with previous query I obtained error ORA-01422, so I substitute it with a cursor definition first, and a "for row in (query) " later:

CURSOR C IS
SELECT ID FROM TABLE T WHERE T.NAME = pn AND T.SUR = ln;

This behavior is strange for me, in fact if I exec only query from sqlplus or toad, i obtain correct result.

Oracle version is 8.1.

Thanks in advance

#

This is my procedure (I Hope you don't find mismatch, because I changed name of objects):

CREATE OR REPLACE PROCEDURE myproc (
pn in VARCHAR2,
ln in VARCHAR2,
other in VARCHAR2,
datarif in VARCHAR2
) 
AS
  idT    NUMBER;
  idST NUMBER;
  idSE    NUMBER;

  CURSOR C IS 
    SELECT ID
    FROM TABLE T
    WHERE 
    T.NAME = pn AND T.SUR = ln;

BEGIN

     for x in ( SELECT ID
         FROM TABLE T
        WHERE 
        T.NAME = pn AND T.SUR = ln )
     loop 
       DBMS_OUTPUT.put_line('INFOR:' || x.ID);
     end loop;


     open C;
     loop
       fetch C into idT;
        exit when C%NOTFOUND;
        DBMS_OUTPUT.put_line('INLOOP:ID='||idT);
 end loop;
 close C;

 DBMS_OUTPUT.put_line ( 'OUTLOOP: ID='||idT );


  EXCEPTION
    WHEN NO_DATA_FOUND THEN
     NULL;
    WHEN TOO_MANY_ROWS THEN 
      RAISE_APPLICATION_ERROR(-20001, 'Exact Fetch Returned many Rows');  
    WHEN OTHERS THEN
     DBMS_OUTPUT.put_line('ERROR');
     ROLLBACK;
 RAISE;

END myproc;
/

Thank you

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评论(3

温暖的光 2024-10-18 23:11:40

也许您的参数和表字段之间存在冲突?

通过添加过程名称作为参数范围来更改它:

 T.NAME = myproc.pn AND T.SUR = myproc.ln

Maybe there's a clash between your parameters and fields of the table?

Change it by adding the name of your procedure as scope for your parameters:

 T.NAME = myproc.pn AND T.SUR = myproc.ln
£烟消云散 2024-10-18 23:11:40

“...因为我更改了对象的名称”

也许您的某些参数与某些列具有相同的名称。

例如,如果您的过程如下所示:

CREATE OR REPLACE PROCEDURE myproc (
pn in VARCHAR2,
sur in VARCHAR2,
other in VARCHAR2,
datarif in VARCHAR2
)
...
SELECT ID INTO idvar FROM TABLE T WHERE T.NAME = pn AND T.SUR = sur;
...

您将收到 TOO_MANY_ROWS 错误,因为条件“T.SUR = sur”与“T.SUR = T.SUR”具有相同的效果。

"... because I changed name of objects"

Maybe some of your parameters have the same names as some columns.

For example if your procedure looked like this:

CREATE OR REPLACE PROCEDURE myproc (
pn in VARCHAR2,
sur in VARCHAR2,
other in VARCHAR2,
datarif in VARCHAR2
)
...
SELECT ID INTO idvar FROM TABLE T WHERE T.NAME = pn AND T.SUR = sur;
...

you would get TOO_MANY_ROWS error because the condition "T.SUR = sur" would have the same effect as "T.SUR = T.SUR".

平定天下 2024-10-18 23:11:40

我用你的示例表测试了你的第一个语句!在我的机器上它可以工作。但那是一个 Oracle 10g 数据库。

编辑
我重新编写了你的​​程序,并且在我的机器上该版本运行良好!

create or replace
PROCEDURE myproc (
  pn in VARCHAR2,
  ln in VARCHAR2,
  other in VARCHAR2,
  datarif in VARCHAR2
) 
AS
  idvar    NUMBER;
BEGIN
  SELECT ID INTO idvar FROM TEST T WHERE T.NAME = pn AND T.SUR = ln;
  DBMS_OUTPUT.put_line ( 'OUTLOOP: ID='||idvar );
END myproc;

I tested your first statement with your example table! And on my machine it works. But that is an Oracle 10g database.

Edit:
I re-writed your procedure and on my machine that version works well!

create or replace
PROCEDURE myproc (
  pn in VARCHAR2,
  ln in VARCHAR2,
  other in VARCHAR2,
  datarif in VARCHAR2
) 
AS
  idvar    NUMBER;
BEGIN
  SELECT ID INTO idvar FROM TEST T WHERE T.NAME = pn AND T.SUR = ln;
  DBMS_OUTPUT.put_line ( 'OUTLOOP: ID='||idvar );
END myproc;
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