這個BUG出現會報錯如下：

selectto_char(max(RENEWAL_DATE))?intoM_YEAR_MONTH?fromt_renewal_schedule;

ORA-06502: PL/SQL:數字或值錯誤:?字符串緩沖區太小

這個時候有3個方法可以解決

1、setting initialisation parameter BLANK_TRIMMING=TRUE

2、declare PL/SQL CHAR and VARCHAR2 variable used in the INTO clause of SELECT statement as 4,000 bytes.

3、Use CAST?SQL?function to constraint the size to that of the variable size like

?SELECT CAST(MIN('Y') AS CHAR(1)) INTO C FROM DUAL;

CAST是強制轉換函數。

參數BLANK_TRIMMING設置為TRUE的時候可以解決我們的BUG問題，同時這個參數設置為TRUE會在進行變量的賦值的時候忽略末尾的空格，同時這個參數必須關閉數據庫進行更改。所以請評估下，是否可行。

?

試驗如下：

?

SQL> CREATE TABLE abc (

? 2? cont_no char(8),

? 3? plan_id char(7));

?

Table created

SQL> INSERT INTO abc VALUES ('123456 ?', '7654321'); ??---（這里空格有2位）

1 row inserted

SQL> commit;

?

SQL> DECLARE

?2???? c_Plan_ID char(6);

? 3? BEGIN

? 4???? SELECT cont_no INTO c_Plan_ID from abc;

? 5???? dbms_output.put_line(c_Plan_ID);

? 6? END;

? 7? /

DECLARE

?? c_Plan_ID char(6);

BEGIN

?? SELECT cont_no INTO c_Plan_ID from abc;

?? dbms_output.put_line(c_Plan_ID);

END;

ORA-06502: PL/SQL:數字或值錯誤:?字符串緩沖區太小

ORA-06512:在line 5

然后我們修改參數BLANK_TRIMMING為true

alter system set BLANK_TRIMMING=true scope=spfile;

重啟數據庫進行測試

進行測試

SQL>? DECLARE

?2???????? c_Plan_ID char(6);

? 3????? BEGIN

? 4???????? SELECT cont_no INTO c_Plan_ID from abc;

? 5???????? dbms_output.put_line(c_Plan_ID);

? 6????? END;

? 7? /

?

123456

?

PL/SQL procedure successfully completed

看到可以完成了

?

下面是METALINK的原話

SELECT containing a MIN or MAX into a CHAR variable inside a PL/SQL block Fails With ORA-06502 [ID 311653.1]??

Applies to:

Oracle?Server?-EnterpriseEdition - Version:10.1.0.4 to 10.1.0.4

Oracle Server -EnterpriseEdition - Version:9.2.0.6 to 9.2.0.7

Oracle Server -EnterpriseEdition - Version:10.2.0.1 to 10.2.0.1

This problem can occur on any platform.

?

Symptoms

SELECT containing a MIN or MAX into a CHAR variable inside a PL/SQL block Fails With:

?

?

ORA-06502: PL/SQL: numeric or value error: character string buffer too small

?

Example:

?DECLAREC CHAR(1);BEGINSELECT MIN('Y') INTO C FROM dual;END;/DECLARE*ERROR at line 1:ORA-06502: PL/SQL: numeric or value error: character string buffer too smallORA-06512: at line 4Changes

After upgrading to Oracle10gR210.2.0.1

After applying10.1.0.4 patchset

After applying9.2.0.6 patchset

After applying9.2.0.7 patchset

Cause

This problem has been identified as

?

Bug:4458790 ORA-6502 selecting MAX/MIN into a CHAR variable in PLSQL

?

This problem is introduced in Oracle9i9.2.0.6, Oracle10g10.1.0.4 and 10.2.0.1 by the fix for Bug:3499258.

?

A PLSQL block which SELECTs a MAX or MIN into a fixed CHAR variable can fail with an unexpected ORA-6502 "character string buffer too small" error.

Solution

This problem is fixed in

?

Oracle9iR2 (9.2.0.8, terminal patchset)

Oracle11gR1(11.1.0.x or higher)

Oracle10gR1(10.1.0.5 or higher)

?

Oracle10gR2 (10.2.0.2 or higher)

?

Workarounds:

?

setting initialisation parameter BLANK_TRIMMING=TRUE

?

?

declare PL/SQL CHAR and VARCHAR2 variable used in the INTO clause of SELECT statement as 4,000 bytes.

?

?

Use CAST SQL function to constraint the size to that of the variable size like

?

SELECT CAST(MIN('Y') AS CHAR(1)) INTO C FROM DUAL;

?

轉載于:https://www.cnblogs.com/jmax/p/3161826.html

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